Defining Dosimetric Reference Levels in Computed Tomography Spectral Scanning (NR Spectral)

Spectral computed tomography or dual-energy CT imaging can overcome the limitations of conventional CT in differentiating between two materials with equivalent total attenuation. It can generate several types of images, such as virtual monochromatic images, which improve the contrast-to-noise ratio for low energy levels and reduce artifacts for high energy levels. It also allows for quantitative image analysis and thus better characterization of lesions and tissues through material mapping (e.g., iodinated contrast agent mapping). This technique is increasingly used in routine clinical practice thanks to improvements in image flow management and technological advances. It also involves exposing patients to ionizing radiation, as with conventional CT but, unlike conventional CT scans, for which dosimetric reference levels (RLs) are defined for the most common examinations in France (RL decree dated 2019), there are currently no dosimetric reference levels for examinations performed using this technique. Yet RLs are an important and effective tools for optimizing patient exposure to ionizing radiation. Several articles were published between 2012 and 2017 when the first dual-energy scanners arrived in clinics. However, the results presented in these studies are now far removed from recent practices, as they do not take into account the latest technological developments used in dual-energy scanners, which reduce X-ray doses.

The main objective of the study is to define dosimetric reference levels for the most commonly performed spectral computed tomography examinations in France.

Study Overview

• Status: Active, not recruiting
• Conditions: Medical Imaging
• Intervention / Treatment: Radiation: Spectral ComputedTomography

Detailed Description

Spectral computed tomography (CT) (or dual-energy CT) imaging can overcome the limitations of conventional CT in differentiating between two materials with equivalent total attenuation. It can generate several types of images, such as virtual monochromatic images, which improve the contrast-to-noise ratio for low energy levels and reduce artifacts for high energy levels. It also allows for quantitative image analysis and thus better characterization of lesions and tissues through material mapping (e.g., iodinated contrast agent mapping). This technique is increasingly used in routine clinical practice thanks to improvements in image flow management and technological advances. It also involves exposing patients to ionizing radiation, as with conventional CT.

However, unlike conventional CT scans, for which dosimetric reference levels (RLs) are defined for the most common examinations in France (RL decree dated 2019), there are currently no dosimetric reference levels for examinations performed using this technique. Yet the RL is an important and effective tool in optimizing patient exposure to ionizing radiation. In fact, a number of articles were published between 2012 and 2017, when the first dual-energy scanners arrived in clinics. However, the results presented in these studies are now far removed from recent practices, as they do not take into account the latest technological developments used in dual-energy scanners, which reduce X-ray doses.

The main objective of the study is to define dosimetric reference levels for the most frequently performed spectral computed tomography examinations in France:

1. Chest CT for pulmonary embolism
2. Chest CT for other indications
3. Coronary CT with contrast injection and retrospective gating
4. Coronary CT with contrast injection and prospective gating
5. Cranial CT with contrast injection
6. Supra-aortic trunk CT
7. Neck and ear,nose and throat sphere CT with contrast injection
8. Oncological abdomen-pelvis CT scan
9. Abdomen-pelvis CT scan to check for kidney stones
10. Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones
11. Oncological chest-abdomen-pelvis CT scan
12. Non-oncological chest-abdomen-pelvis CT scan
13. Oncological chest-abdomen CT scan
14. Non-oncological chest-abdomen CT scan
15. Lower limb angiography
16. Cervical spine CT scan
17. Thoracic spine CT scan
18. Lumbar spine CT scan
19. Pelvis CT scan,
20. Extremities CT scan

The secondary objectives of the study are to evaluate, for each examination performed:

1. the impact of the spectral acquisition/detection technique on the dose delivered to patients.
2. the impact of patients' BMI on the dose delivered to patients.
3. the impact of reconstruction algorithms on the dose delivered to patients.

• Study Type: Observational
• Enrollment (Actual): 9600

Contacts and Locations

Study Locations

• France
  • Gard
    • Nîmes, Gard, France, 30029
      • Nimes University Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

• Sampling Method: Non-Probability Sample

Study Population

All adult patients who underwent a spectral CT scan between January 1, 2023, and August 31, 2024, as part of their treatment.

Description

Inclusion Criteria:

• Adult male/female patient (≥ 18 years old)
• Body Mass Index (BMI) between 18 and 35 kg/m²
• Patients who underwent a spectral CT scan between January 1, 2023, and August 31, 2024, as part of their treatment.

Exclusion Criteria:

- Pregnant women

Study Plan

How is the study designed?

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort

Intervention / Treatment

Patients undergoing a maximum number of 18 spectral CT scans among the examinations mentioned below; Patients undergoing a maximum number of 18 spectral CT scans among the examinations mentioned below: Chest CT for pulmonary embolism; Chest CT for other indications; Coronary CT with contrast injection and retrospective gating; Coronary CT with contrast injection and prospective gating; Cranial CT with contrast injection; Supra-aortic trunk CT; Neck and ear,nose and throat sphere CT with contrast injection; Oncological abdomen-pelvis CT scan; Abdomen-pelvis CT scan to check for kidney stones; Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones; Oncological chest-abdomen-pelvis CT scan; Non-oncological chest-abdomen-pelvis CT scan; Oncological chest-abdomen CT scan; Non-oncological chest-abdomen CT scan; Lower limb angiography; Cervical spine CT scan; Thoracic spine CT scan; Lumbar spine CT scan; Pelvis CT scan,; Extremities CT scan

Radiation: Spectral ComputedTomography; Commonly performed spectral computed tomography examinations in France

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Dosimetric reference levels for spectral computed tomography examinations in France: Chest CT for pulmonary embolism. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Chest CT for pulmonary embolism. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Chest CT for other indications. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Chest CT for other indications. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Coronary CT with contrast injection and retrospective gating. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Coronary CT with contrast injection and prospective gating. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Cranial CT with contrast injection. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Cranial CT with contrast injection. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Supra-aortic trunk CT. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Supra-aortic trunk CT. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Neck and ear,nose and throat sphere CT with contrast injection. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Neck and ear,nose and throat sphere CT with contrast injection. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Oncological abdomen-pelvis CT scan. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Oncological abdomen-pelvis CT scan. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Abdomen-pelvis CT scan to check for kidney stones. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Abdomen-pelvis CT scan to check for kidney stones. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Oncological chest-abdomen-pelvis CT scan. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Oncological chest-abdomen-pelvis CT scan. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Non-oncological chest-abdomen-pelvis CT scan. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Non-oncological chest-abdomen-pelvis CT scan. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Oncological chest-abdomen CT scan. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Oncological chest-abdomen CT scan. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Non-oncological chest-abdomen CT scan. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Non-oncological chest-abdomen CT scan. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Lower limb angiography. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Lower limb angiography. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Cervical spine CT scan. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Cervical spine CT scan. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Thoracic spine CT scan. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Thoracic spine CT scan. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Lumbar spine CT scan. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Lumbar spine CT scan. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Pelvis CT scan. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Pelvis CT scan. DLP	Dose length product (DLP) expressed in mGy.cm	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Extremities CT scan. CTDIvol	Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy).	Periprocedural
Dosimetric reference levels for spectral computed tomography examinations in France: Extremities CT scan. DLP	Dose length product (DLP) expressed in mGy.cm will be recorded	Periprocedural

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for pulmonary embolism. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for pulmonary embolism. Number of acquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for pulmonary embolism. CTDIvol	The dose (CTDIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for pulmonary embolism. DLP	Dose length product (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Chest CT for pulmonary embolism. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Chest CT for pulmonary embolism. Acquisition parameters, kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Chest CT for pulmonary embolism. Acquisition parameters, mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Chest CT for pulmonary embolism. Acquisition parameters. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Chest CT for pulmonary embolism. Acquisition parameters. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Chest CT for pulmonary embolism. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for other indications. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for other indications. Number of acquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for other indications. CTDIvol	The dose (CTDIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for other indications. DLP	The dose length product (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Chest CT for other indications. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Chest CT for other indications. Acquisition parameters, kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Chest CT for other indications. Acquisition parameters, mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Chest CT for other indications. Acquisition parameters, rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Chest CT for other indications. Acquisition parameters, helical pitch	Helical pitch time will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Chest CT for other indications. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Coronary CT with contrast injection and retrospective gating. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Coronary CT with contrast injection and retrospective gating. Number of acquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Coronary CT with contrast injection and retrospective gating. CTDIvol	The dose (CTDIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Coronary CT with contrast injection and retrospective gating. DLP	The dose length product (DLP) will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Coronary CT with contrast injection and retrospective gating. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Coronary CT with contrast injection and retrospective gating. Acquisition parameters, kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Coronary CT with contrast injection and retrospective gating. Acquisition parameters, mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Coronary CT with contrast injection and retrospective gating. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Coronary CT with contrast injection and retrospective gating. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Coronary CT with contrast injection and retrospective gating. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cranial CT with contrast injection. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cranial CT with contrast injection. Number of acquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cranial CT with contrast injection. CTDIvol	The dose (CTDIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cranial CT with contrast injection. DLP	Dose length product (DLP) will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Cranial CT with contrast injection. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Cranial CT with contrast injection. Acquisition parameters, kV	Acquisition parameters (kV)will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Cranial CT with contrast injection. Acquisition parameters, mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Cranial CT with contrast injection. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients: Cranial CT with contrast injection. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Cranial CT with contrast injection. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Supra-aortic trunk CT. Acquisition type	The type of acquisition will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Supra-aortic trunk CT. Number of acquisitions	The number of acquisitions will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Supra-aortic trunk CT. CTDIvol	The dose (CTDIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Supra-aortic trunk CT. DLP	The dose (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Supra-aortic trunk CT. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Supra-aortic trunk CT. Acquisition parameters. kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Supra-aortic trunk CT. Acquisition parameters. mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Supra-aortic trunk CT. Acquisition parameters. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Supra-aortic trunk CT. Acquisition parameters. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Neck and ear, nose and throat sphere CT with contrast injection. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Neck and ear, nose and throat sphere CT with contrast injection. Number of acquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Neck and ear, nose and throat sphere CT with contrast injection. CTDIvol	The dose (CTDIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Neck and ear, nose and throat sphere CT with contrast injection. DLP	The dose (DLP) expressed in mGy.cm will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Neck and ear, nose and throat sphere CT with contrast injection. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Neck and ear, nose and throat sphere CT with contrast injection. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological abdomen-pelvis CT scan. Acquisition type	The type of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological abdomen-pelvis CT scan. Number of acquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological abdomen-pelvis CT scan. CTDIvol	The dose (CDTIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological abdomen-pelvis CT scan. DLP	The dose length product (DLP) expressed in mGy.cm will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological abdomen-pelvis CT scan. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological abdomen-pelvis CT scan. Acquisition parameters (kV)	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological abdomen-pelvis CT scan. Acquisition parameters (mAs)	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological abdomen-pelvis CT scan. Acquisition parameters. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological abdomen-pelvis CT scan. Acquisition parameters. Helical pitch	Helical pitch will be recorded will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients: Oncological abdomen-pelvis CT scan. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan to check for kidney stones. Acquisition type an	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan to check for kidney stones. Number of acquisitions an	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan to check for kidney stones. CTDIvol an	The dose (CDTIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan to check for kidney stones. DLP an	The dose length product (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan to check for kidney stones. BMI an	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan to check for kidney stones. Acquisition parameters. Kv an	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan to check for kidney stones. Acquisition parameters. mAs an	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan to check for kidney stones. Rotation time an	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan to check for kidney stones. Helical pitch an	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Abdomen-pelvis CT scan to check for kidney stones. Type of reconstruction algorithm an	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Number of acquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. CTDIvol	The dose (CTDIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. DLP	The dose length product (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Acquisition parameters. kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Acquisition parameters. mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen-pelvis CT scan. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen-pelvis CT scan. Number of acquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen-pelvis CT scan. CTDIvol	The dose (CDTIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen-pelvis CT scan. DLP	The dose (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen-pelvis CT scan. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen-pelvis CT scan. Acquisition parameters. kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen-pelvis CT scan. Acquisition parameters. mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen-pelvis CT scan. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen-pelvis CT scan. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Oncological chest-abdomen-pelvis CT scan. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen-pelvis CT scan. Acquisition type.	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen-pelvis CT scan. Number of acquisitions.	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen-pelvis CT scan. CDTIvol	The dose (CTDIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen-pelvis CT scan. CDTIvol. DLP	The dose length product (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen-pelvis CT scan. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen-pelvis CT scan. Acquisition parameters. kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen-pelvis CT scan. Acquisition parameters. mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen-pelvis CT scan. Acquisition parameters. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen-pelvis CT scan. Acquisition parameters. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Non-oncological chest-abdomen-pelvis CT scan. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen CT scan. Aquisition type	The type of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen CT scan. Number of aquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen CT scan. CTDIvol	The dose (CTDIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen CT scan. DLP	The dose length product (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen CT scan. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen CT scan. Acquisition parameters (kV)	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen CT scan. Acquisition parameters (mAs)	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen CT scan. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen CT scan. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Oncological chest-abdomen CT scan. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen CT scan. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen CT scan. Number of acquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen CT scan. CTDIvol	The dose (CDTIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen CT scan. DLP	The dose length product (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen CT scan	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen CT scan. Acquisition parameters. kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen CT scan. Acquisition parameters. mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients: Non-oncological chest-abdomen CT scan. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. Number of acquitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. CTDIvol	The dose CDTIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. DLP	The dose length product (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Lower limb angiography. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Lower limb angiography. Acquisition parameters. kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Lower limb angiography. Acquisition parameters. mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. Rotation time	Rotation time will be recorded in seconds.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. Helical pitch	Helical pitch will be recorded as a ratio.This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. Type of reconstruction algorithm	Type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cervical spine CT scan. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cervical spine CT scan. Number of acquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cervical spine CT scan. CDTIvol	The dose (CDTIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cervical spine CT scan. DLP	The dose length product (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Cervical spine CT scan. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Cervical spine CT scan. Acquisition parameters. kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Cervical spine CT scan. Acquisition parameters. mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Cervical spine CT scan. Acquisition parameters. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Cervical spine CT scan. Acquisition parameters. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Cervical spine CT scan. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Thoracic spine CT scan. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Thoracic spine CT scan. Number of acquisitions	The number of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Thoracic spine CT scan. CTDIvol	The dose (CDTIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Thoracic spine CT scan. DLP	The dose length product (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Thoracic spine CT scan. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Thoracic spine CT scan. Acquisition parameters (kV)	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Thoracic spine CT scan. Acquisition parameters (mAs)	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Thoracic spine CT scan. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Thoracic spine CT scan. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Thoracic spine CT scan. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lumbar spine CT scan. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lumbar spine CT scan. Number of acquisitions	The number of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lumbar spine CT scan. CTDIvol	The dose (CDTIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lumbar spine CT scan. DLP	The dose length product (DLP) expressed in mGy.cm will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Lumbar spine CT scan. BMI	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Lumbar spine CT scan. Acquisition parameters. kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Lumbar spine CT scan. Acquisition parameters. mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Lumbar spine CT scan. Acquisition parameters. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Lumbar spine CT scan. Acquisition parameters. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients: Lumbar spine CT scan. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Pelvis CT scan. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Pelvis CT scan. Number of acquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Pelvis CT scan. CTDIvol	The dose (CDTIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Pelvis CT scan. DLP	The dose length product (DLP) expressed in mGy.cm will be recorded.	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Pelvis CT scan. BMI.	Weight and height will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Pelvis CT scan. Acquistion parameters. kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Pelvis CT scan. Acquistion parameters. mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Pelvis CT scan. Acquistion parameters. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Pelvis CT scan. Acquistion parameters. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients : Pelvis CT scan. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Extremities CT scan. Acquisition type	The type of acquisition will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Extremities CT scan. Number of acquisitions	The number of acquisitions will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Extremities CT scan. CTDIvol	The dose (CTDIvol) will be recorded.	Periprocedural
Impact of the spectral acquisition/detection technique on the dose delivered to patients: Extremities CT scan. DLP	The dose length product (DLP) expressed in mGy.cm will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Extremities CT scan. BMI	Weight in kg and height in cm in will be combined to report BMI in kg/m^2	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Extremities CT scan. Acquisition parameters. kV	Acquisition parameters (kV) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Extremities CT scan. Acquisition parameters. mAs	Acquisition parameters (mAs) will be recorded	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Extremities CT scan. Acquisition parameters. Rotation time	Rotation time will be recorded in seconds	Periprocedural
Impact of patients' BMI on the dose delivered to patients : Extremities CT scan. Acquisition parameters. Helical pitch	Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness	Periprocedural
Impact of reconstruction algorithms on the dose delivered to patients: Extremities CT scan. Type of reconstruction algorithm	The type of reconstruction algorithm (iterative or deep learning) will be recorded	Periprocedural

Collaborators and Investigators

• Sponsor: Centre Hospitalier Universitaire de Nīmes
• Collaborators: Centre Hospitalier Universitaire de Saint Etienne; University Hospital, Bordeaux; Poitiers University Hospital; Saint-Louis Hospital, Paris, France; Saint Antoine University Hospital; Centre Hospitalier Lyon Sud; Amiens University Hospital; Institut Curie; Hôpital Necker-Enfants Malades; Hopital Louis Pradel; Centre Hospitalier de Valenciennes; Lille University Hospital; Institut Paoli Calmettes, Marseille; CHU Hôpital Lariboisière APHP; Bichat Hospital, Paris, France; Hôpital Louis Mourier, 92700 Colombes; Centre Léon Bérard, Lyon; Henri Mondor Hospital, Créteil; Nord Ardennes Intercommunal Hospital; Centre Antoine Lacassagne, Nice; Hôpital Edouard Herriot (GH Centre), Lyon
• Investigators: Study Chair: Joël GREFFIER, Nimes University Hospital

Publications and helpful links

General Publications

• Etard C, Bigand E, Salvat C, Vidal V, Beregi JP, Hornbeck A, Greffier J. Patient dose in interventional radiology: a multicentre study of the most frequent procedures in France. Eur Radiol. 2017 Oct;27(10):4281-4290. doi: 10.1007/s00330-017-4780-5. Epub 2017 Mar 13.
• Henzler T, Fink C, Schoenberg SO, Schoepf UJ. Dual-energy CT: radiation dose aspects. AJR Am J Roentgenol. 2012 Nov;199(5 Suppl):S16-25. doi: 10.2214/AJR.12.9210.
• Ghasemi Shayan R, Oladghaffari M, Sajjadian F, Fazel Ghaziyani M. Image Quality and Dose Comparison of Single-Energy CT (SECT) and Dual-Energy CT (DECT). Radiol Res Pract. 2020 Apr 20;2020:1403957. doi: 10.1155/2020/1403957. eCollection 2020.
• Greffier J, Villani N, Defez D, Dabli D, Si-Mohamed S. Spectral CT imaging: Technical principles of dual-energy CT and multi-energy photon-counting CT. Diagn Interv Imaging. 2023 Apr;104(4):167-177. doi: 10.1016/j.diii.2022.11.003. Epub 2022 Nov 19.
• Dabli D, Frandon J, Belaouni A, Akessoul P, Addala T, Berny L, Beregi JP, Greffier J. Optimization of image quality and accuracy of low iodine concentration quantification as function of dose level and reconstruction algorithm for abdominal imaging using dual-source CT: A phantom study. Diagn Interv Imaging. 2022 Jan;103(1):31-40. doi: 10.1016/j.diii.2021.08.004. Epub 2021 Oct 6.
• Si-Mohamed SA, Boccalini S, Villien M, Yagil Y, Erhard K, Boussel L, Douek PC. First Experience With a Whole-Body Spectral Photon-Counting CT Clinical Prototype. Invest Radiol. 2023 Jul 1;58(7):459-471. doi: 10.1097/RLI.0000000000000965. Epub 2023 Feb 22.
• Wortman JR, Shyu JY, Dileo J, Uyeda JW, Sodickson AD. Dual-energy CT for routine imaging of the abdomen and pelvis: radiation dose and image quality. Emerg Radiol. 2020 Feb;27(1):45-50. doi: 10.1007/s10140-019-01733-9. Epub 2019 Nov 1.
• Noda Y, Kawai N, Kawamura T, Kobori A, Miyase R, Iwashima K, Kaga T, Miyoshi T, Hyodo F, Kato H, Matsuo M. Radiation and iodine dose reduced thoraco-abdomino-pelvic dual-energy CT at 40 keV reconstructed with deep learning image reconstruction. Br J Radiol. 2022 Jun 1;95(1134):20211163. doi: 10.1259/bjr.20211163. Epub 2022 Mar 4.
• Greffier J, Ferretti G, Rousseau J, Andreani O, Alonso E, Rauch A, Gillet R, Le Roy J, Cabrol-Faivre L, Douane F, David A, Henry S, Jacques T, Stefanovic X, Decoux E, Lafay F, Pilleul F, Couzon F, Boutet C, Woerly B, Baur P, Sans N, Faruch M, Moussier-Lherm A, Tselikas L, Jacquier A, Bigand E, Pessis E, Teriitehau C, Magnier F, Cassagnes L, Haberlay M, Boutteau D, De Kerviler E, Majorel-Gouthain C, Defez D, Vuillod A, Rouviere O, Hennequin L, Fohlen A, Alwan R, Malakhia A, Aubry S, Dohan A, Eresue-Bony M, Gautier R, Dal R, Dabli D, Hebert T, Kovacs R, Hadid-Beurrier L, Bousson V, Potel M, Barbotteau Y, Michel C, Habib-Geryes B, Andre M, Arnaud T, Bestion N, Ernst O, Monfraix S, Brillet PY, Guiu B, Boussel L, Demonchy M, Beregi JP, Frandon J. National dose reference levels in computed tomography-guided interventional procedures-a proposal. Eur Radiol. 2020 Oct;30(10):5690-5701. doi: 10.1007/s00330-020-06903-9. Epub 2020 May 2.

Study record dates

Study Major Dates

• Study Start (Actual): September 1, 2025
• Primary Completion (Estimated): December 31, 2025
• Study Completion (Estimated): June 30, 2026

Study Registration Dates

• First Submitted: September 10, 2025
• First Submitted That Met QC Criteria: December 12, 2025
• First Posted (Actual): December 26, 2025

Study Record Updates

• Last Update Posted (Actual): December 26, 2025
• Last Update Submitted That Met QC Criteria: December 12, 2025
• Last Verified: November 1, 2025

More Information

Terms related to this study

• Keywords: Radiology; Radiation dose; Reference levels; Spectral Computed Tomography Imaging
• Other Study ID Numbers: NIMAO/2024-1/DD-01

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No