Detection of pulmonary nodules: a clinical study protocol to compare ultra-low dose chest CT and standard low-dose CT using ASIR-V

Marie Ludwig, Emilie Chipon, Julien Cohen, Emilie Reymond, Maud Medici, Anthony Cole, Alexandre Moreau Gaudry, Gilbert Ferretti, Marie Ludwig, Emilie Chipon, Julien Cohen, Emilie Reymond, Maud Medici, Anthony Cole, Alexandre Moreau Gaudry, Gilbert Ferretti

Abstract

Introduction: Lung cancer screening in individuals at risk has been recommended by various scientific institutions. One of the main concerns for CT screening is repeated radiation exposure, with the risk of inducing malignancies in healthy individuals. Therefore, lowering the radiation dose is one of the main objectives for radiologists. The aim of this study is to demonstrate that an ultra-low dose (ULD) chest CT protocol, using recently introduced hybrid iterative reconstruction (ASiR-V, GE medical Healthcare, Milwaukee, Wisconsin, USA), is as performant as a standard 'low dose' (LD) CT to detect non-calcified lung nodules ≥4 mm.

Methods and analysis: The total number of patients to include is 150. Those are referred for non-enhanced chest CT for detection or follow-up of lung nodule and will undergo an additional unenhanced ULD CT acquisition, the dose of which is on average 10 times lower than the conventional LD acquisition. Total dose of the entire exam (LD+ULD) is lower than the French diagnostic reference level for a chest CT (6.65 millisievert). ULD CT images will be reconstructed with 50% and 100% ASiR-V and LD CT with 50%. The three sets of images will be read in random order by two pair of radiologists, in a blind test, where patient identification and study outcomes are concealed. Detection rate (sensitivity) is the primary outcome. Secondary outcomes will include concordance of nodule characteristics; interobserver reproducibility; influence of subjects' characteristics, nodule location and nodule size; and concordance of emphysema, coronary calcifications evaluated by visual scoring and bronchial alterations between LD and ULD CT. In case of discordance, a third radiologist will arbitrate.

Ethics and dissemination: The study was approved by the relevant ethical committee. Each study participant will sign an informed consent form.

Trial registration number: NCT03305978; Pre-results.

Keywords: iterative reconstruction; low dose computed tomography; lung cancer screening; pulmonary nodule; ultra low dose computed tomography.

Conflict of interest statement

Competing interests: None declared.

© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

Figures

Figure 1
Figure 1
Study flow chart. ASiR-V, adaptive statistical iterative reconstruction-Véo (GE medical Healthcare, Milwaukee, Wisconsin, USA); LD, low dose; LD50, low dose CT with 50% ASiR-V reconstruction; ULD, ultra-low dose; ULD50, ultra-low dose CT with 50% ASiR-V reconstruction; ULD 100, ultra-low dose CT with 100% ASIR-V reconstruction.

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