AI-Based Analysis of Port Catheter Tip Position
2026年9月14日 更新者：Bagcilar Training and Research Hospital
Determination of Port Catheter Tip Position Using Artificial Intelligence-Based Automated Image Analysis
This prospective, single-center observational study will evaluate the performance of an artificial intelligence (AI)-based automated image-analysis method that will be developed, internally tested, and locked before prospective enrollment.
The method will estimate the position of totally implantable venous access port catheter tips in adults undergoing right internal jugular vein port implantation as part of routine care.
The automated estimate will be compared with a prespecified manual measurement method.
Reference measurements of the catheter tip and the cavoatrial junction will be obtained from clinically indicated chest computed tomography images when both structures are visible.
No additional chest radiography or computed tomography will be performed for research purposes, and the automated output will not guide catheter placement or alter clinical decisions.
The primary performance measure will be the mean absolute error of the automated estimate in the prospective cohort.
調査の概要
状態
まだ募集していません
条件
詳細な説明
Before prospective enrollment, a two-dimensional nnU-Net-based multitask model will be developed and internally tested using retrospective chest radiographs from the same center. The model parameters, ensemble, preprocessing steps, and technical output rules will be locked before prospective enrollment. The retrospective development and internal test datasets are not part of the enrollment reported for this record.
The prospective component will include one observational cohort of adults aged 18 years or older undergoing right internal jugular vein port implantation during routine clinical care. Implantation, chest radiography, computed tomography, and all clinical management decisions will remain under the responsibility of the treating clinical team and will not be assigned by the research protocol. The automated output will not be made available for procedural guidance or patient management.
For each evaluable participant, the locked automated method will generate an estimate based on chest radiographic image analysis and a patient-specific Delta adjustment. A prespecified manual A+B measurement method will be applied as a comparator in the same participants. Reference measurements will be derived from the first suitable post-implantation noncontrast chest computed tomography examination obtained for a routine clinical indication, provided that both the catheter tip and the cavoatrial junction are visible and no catheter manipulation occurred beforehand. No additional radiographic or computed tomography examination will be requested for the study.
The primary objective is to quantify the error of the automated estimate using mean absolute error in the prospective cohort. Prespecified secondary analyses will evaluate additional error, agreement, pragmatic accuracy, technical assessability, and repeatability measures. The ±10 mm criterion will be treated as a pragmatic accuracy threshold rather than a clinical safety boundary. The study is a same-center prospective performance evaluation; it is not an external validation and is not designed to assess clinical benefit or to establish that the system is ready for clinical use.
研究の種類
観察的
入学 (推定)
100
連絡先と場所
このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。
研究連絡先
- 名前：Balamir Utku Seker
- 電話番号：+90 539 433 79 62
- メール：b.utku.seker@gmail.com
研究場所
-
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Istanbul
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Bağcılar、Istanbul、トルコ（Türkiye）、34200
- Bagcilar Training and Research Hospital
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コンタクト：
- Serdar Demirgan
- 電話番号：+90 212 440 40 00
- メール：istanbuleah30@saglik.gov.tr
-
-
参加基準
研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。
適格基準
就学可能な年齢
- 大人
- 高齢者
健康ボランティアの受け入れ
いいえ
サンプリング方法
非確率サンプル
調査対象母集団
Adults aged 18 years or older scheduled for right internal jugular vein placement of a totally implantable venous access port at Bagcilar Training and Research Hospital will be screened consecutively for this single-center prospective observational study.
Enrollment will require written informed consent and confirmation of all eligibility criteria, including availability of a clinically indicated post-implantation noncontrast chest computed tomography (CT) examination and absence of documented catheter manipulation or revision before the selected CT.
CT reference evaluability and generation of a valid automated output will determine the relevant analysis populations and will not be prerequisites for enrollment.
No additional imaging will be performed for research purposes.
説明
Inclusion Criteria:
- Age 18 years or older.
- Planned placement of a totally implantable venous access port through the right internal jugular vein as part of routine clinical care.
- Availability of a suitable pre-implantation chest radiograph obtained as part of routine clinical care.
- Availability of a clinically indicated post-implantation noncontrast chest computed tomography examination.
- Absence of documented catheter manipulation or revision before the selected post-implantation computed tomography examination.
- Provision of written informed consent.
Exclusion Criteria:
- Age younger than 18 years.
- Cancellation of the routine clinical port implantation plan.
- Planned or performed port placement through a venous access route other than the right internal jugular vein.
- No suitable pre-implantation chest radiograph available for study assessment.
- Advanced thoracic deformity or mediastinal distortion precluding the required study measurements.
- Inability or unwillingness to provide written informed consent.
研究計画
このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。
研究はどのように設計されていますか？
デザインの詳細
コホートと介入
グループ/コホート |
介入・治療 |
|---|---|
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Prospective Port Catheter Cohort
Adults aged 18 years or older undergoing totally implantable venous access port implantation through the right internal jugular vein as part of routine clinical care will be enrolled in a single prospective observational cohort.
In each evaluable participant, the locked AI-based automated A+B+Delta method and the prespecified manual A+B measurement method will be assessed using reference measurements from clinically indicated post-implantation noncontrast chest computed tomography.
No research-specific imaging will be performed, and the automated output will not guide port implantation or alter clinical decisions.
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The locked automated method will use chest radiographic image analysis and a patient-specific Delta adjustment to estimate port catheter tip position.
The method will be evaluated offline using reference measurements derived from clinically indicated post-implantation noncontrast chest computed tomography.
Its output will not be provided to the clinical team and will not guide port implantation or alter clinical decisions.
The prespecified manual A+B method will estimate port catheter tip position using manual measurements on the pre-implantation chest radiograph.
It will be applied as a comparator in the same participants.
The manual research measurement will not guide port implantation or alter clinical care.
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この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Mean Absolute Error of Catheter Advancement Length Estimated by the AI-Based Automated A+B+Delta Method
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
Mean absolute error (MAE), in millimeters, will be calculated as the arithmetic mean of the absolute differences between the catheter advancement length estimated by the locked AI-based automated A+B+Delta method and the reference catheter advancement length derived from the first eligible post-implantation noncontrast chest computed tomography examination.
The analysis population will include participants with both a valid automated output and an evaluable reference measurement.
Lower values indicate smaller estimation error.
A 95% confidence interval will be estimated using 10,000 participant-level bias-corrected and accelerated bootstrap resamples.
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At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Median Absolute Error of Catheter Advancement Length Estimated by the AI-Based Automated A+B+Delta Method
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
Median absolute error (MedAE), in millimeters, will be calculated as the median of the absolute differences between the catheter advancement length estimated by the locked AI-based automated A+B+Delta method and the reference catheter advancement length derived from the first eligible post-implantation noncontrast chest computed tomography examination.
The analysis population will include participants with both a valid automated output and an evaluable reference measurement.
Lower values indicate smaller estimation error.
A 95% confidence interval will be estimated using participant-level bootstrap resampling.
|
At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
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Root Mean Squared Error of Catheter Advancement Length Estimated by the AI-Based Automated A+B+Delta Method
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
Root mean squared error (RMSE), in millimeters, will be calculated as the square root of the arithmetic mean of the squared differences between the catheter advancement length estimated by the locked AI-based automated A+B+Delta method and the reference catheter advancement length derived from the first eligible post-implantation noncontrast chest computed tomography examination.
The analysis population will include participants with both a valid automated output and an evaluable reference measurement.
Lower values indicate smaller overall estimation error, and larger individual errors have greater influence because differences are squared before averaging.
A 95% confidence interval will be estimated using participant-level bootstrap resampling.
|
At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
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Mean Signed Error of Catheter Advancement Length Estimated by the AI-Based Automated A+B+Delta Method
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
Mean signed error, in millimeters, will be calculated as the arithmetic mean of the catheter advancement length estimated by the locked AI-based automated A+B+Delta method minus the reference catheter advancement length derived from the first eligible post-implantation noncontrast chest computed tomography examination.
The analysis population will include participants with both a valid automated output and an evaluable reference measurement.
Positive values indicate that the automated method estimates a longer advancement length than the reference, negative values indicate a shorter estimate, and zero indicates no average directional error.
A 95% confidence interval will be estimated using participant-level bootstrap resampling.
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At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
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Mean Paired Difference in Absolute Error Between the AI-Based Automated A+B+Delta and Manual A+B Methods
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
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For each participant, absolute error will be calculated for both the locked AI-based automated A+B+Delta method and the manual A+B method relative to the reference catheter advancement length derived from the first eligible post-implantation noncontrast chest computed tomography examination.
The paired difference, in millimeters, will be calculated as automated absolute error minus manual absolute error, and its arithmetic mean will be reported.
The analysis population will include participants with an evaluable reference measurement and valid estimates from both methods.
Negative values indicate a smaller absolute error for the automated method, positive values indicate a smaller absolute error for the manual method, and zero indicates no average paired difference.
A 95% confidence interval will be estimated using participant-level bootstrap resampling.
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At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
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Proportion of AI-Based Automated A+B+Delta Estimates With Absolute Error Within 10 mm
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
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The proportion of evaluable participants whose absolute error is 10 mm or less will be calculated for the locked AI-based automated A+B+Delta method.
Absolute error will be defined as the absolute difference between the automated estimate and the reference catheter advancement length derived from the first eligible post-implantation noncontrast chest computed tomography examination.
The denominator will include participants with both a valid automated output and an evaluable reference measurement, and the result will be reported as a percentage with a 95% Wilson score confidence interval.
A higher percentage indicates that a larger proportion of estimates meet this prespecified pragmatic accuracy criterion.
The 10 mm threshold is an operational technical accuracy criterion and not a clinical safety boundary.
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At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
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Paired Difference in Proportions of Estimates With Absolute Error Within 10 mm Between the AI-Based Automated A+B+Delta and Manual A+B Methods
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
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For each participant, the locked AI-based automated A+B+Delta estimate and the manual A+B estimate will each be classified by whether the absolute error from the reference catheter advancement length is 10 mm or less.
The paired proportion difference, in percentage points, will be calculated as the automated qualifying proportion minus the manual qualifying proportion.
The analysis population will include participants with an evaluable reference measurement and valid estimates from both methods.
Positive values indicate a higher qualifying proportion for the automated method, and negative values indicate a higher qualifying proportion for the manual method.
A 95% confidence interval will be calculated using Newcombe's method 10; an exact two-sided McNemar test will be used as an auxiliary analysis.
The 10 mm threshold is a prespecified pragmatic accuracy criterion and not a clinical safety boundary.
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At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
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Technical Success Rate of the AI-Based Automated A+B+Delta Method
時間枠：At baseline, during offline analysis of the pre-implantation chest radiograph obtained before port implantation
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Technical success will be defined as the generation of a valid numerical output by the AI-based automated A+B+Delta method after the method has been locked for prospective evaluation.
The numerator will be the number of participants enrolled in the prospective cohort for whom the method generates a valid automated output, and the denominator will be all participants enrolled in the prospective cohort.
A valid output requires the prespecified image-scale, anatomical-landmark, projection, image-quality, and uncertainty criteria to be satisfied.
The result will be reported as a percentage with a 95% Wilson score confidence interval.
Technical success will be reported separately from measurement accuracy among participants with evaluable reference data.
A higher percentage indicates greater technical output availability and does not represent clinical effectiveness or safety.
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At baseline, during offline analysis of the pre-implantation chest radiograph obtained before port implantation
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Intraobserver Agreement of the CT-Derived Catheter Tip-to-Cavoatrial Junction Distance Assessed by ICC(A,1)
時間枠：At repeat assessment of the CT-derived reference measurement after a 4-week washout period
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Intraobserver agreement of the computed tomography (CT)-derived catheter tip-to-cavoatrial junction distance (dBT) will be assessed using a two-way random-effects, absolute-agreement, single-measure intraclass correlation coefficient [ICC(A,1)].
The same radiologist will repeat the dBT measurement in a prespecified random subset of 60 cases after a 4-week washout period, using newly assigned identifiers and reshuffled images while blinded to the initial measurement.
Only cases evaluable at both readings will be analyzed.
Higher ICC values indicate greater relative agreement.
The estimate will be reported with a 95% confidence interval.
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At repeat assessment of the CT-derived reference measurement after a 4-week washout period
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Mean Intraobserver Difference in the CT-Derived Catheter Tip-to-Cavoatrial Junction Distance
時間枠：At repeat assessment of the CT-derived reference measurement after a 4-week washout period
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The mean signed difference (second reading minus first reading), in millimeters, will be calculated for the computed tomography-derived catheter tip-to-cavoatrial junction distance in the prespecified random subset of 60 cases measured twice by the same radiologist after a 4-week washout period.
The radiologist will use newly assigned identifiers and reshuffled images and will be blinded to the initial measurement.
Only cases evaluable at both readings will be analyzed.
Positive values indicate a larger measurement at the second reading, negative values indicate a smaller measurement, and values closer to zero indicate less average systematic difference.
A 95% confidence interval will be reported.
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At repeat assessment of the CT-derived reference measurement after a 4-week washout period
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Within-Subject Standard Deviation of the CT-Derived Catheter Tip-to-Cavoatrial Junction Distance
時間枠：At repeat assessment of the CT-derived reference measurement after a 4-week washout period
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Within-subject standard deviation (wSD), in millimeters, will quantify within-observer variation in the computed tomography-derived catheter tip-to-cavoatrial junction distance.
In the prespecified random subset of 60 cases, the same radiologist will repeat the measurement after a 4-week washout period using newly assigned identifiers and reshuffled images while blinded to the initial measurement.
Only cases evaluable at both readings will be analyzed.
For these cases, wSD will be calculated as the standard deviation of the paired differences (second reading minus first reading) divided by the square root of 2. Lower values indicate less within-observer measurement variation.
A chi-square-based 95% confidence interval will be reported.
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At repeat assessment of the CT-derived reference measurement after a 4-week washout period
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Repeatability Coefficient of the CT-Derived Catheter Tip-to-Cavoatrial Junction Distance
時間枠：At repeat assessment of the CT-derived reference measurement after a 4-week washout period
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The repeatability coefficient (RC), in millimeters, will quantify within-observer repeatability of the computed tomography-derived catheter tip-to-cavoatrial junction distance in the prespecified random subset of 60 cases measured twice by the same radiologist after a 4-week washout period.
Paired differences will be defined as the second reading minus the first reading.
The RC will be calculated as 1.96 times the standard deviation of the paired differences.
Only cases evaluable at both readings will be analyzed.
The radiologist will use newly assigned identifiers and reshuffled images and will be blinded to the initial measurement.
Lower RC values indicate less within-observer measurement variation.
A chi-square-based 95% confidence interval will be reported.
|
At repeat assessment of the CT-derived reference measurement after a 4-week washout period
|
|
Mean Absolute Error of Catheter Advancement Length Estimated by the Manual A+B Method
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
Mean absolute error (MAE), in millimeters, will be calculated as the arithmetic mean of the absolute differences between the catheter advancement length estimated by the prespecified manual A+B measurement method and the CT-derived reference catheter advancement length.
The analysis population will include participants with both a valid manual A+B estimate and an evaluable CT-derived reference measurement.
Lower values indicate smaller estimation error.
A 95% confidence interval will be estimated using participant-level bootstrap resampling.
|
At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
|
Median Absolute Error of Catheter Advancement Length Estimated by the Manual A+B Method
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
Median absolute error (MedAE), in millimeters, will be calculated as the median of the absolute differences between the catheter advancement length estimated by the prespecified manual A+B measurement method and the CT-derived reference catheter advancement length.
The analysis population will include participants with both a valid manual A+B estimate and an evaluable CT-derived reference measurement.
Lower values indicate smaller estimation error.
A 95% confidence interval will be estimated using participant-level bootstrap resampling.
|
At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
|
Root Mean Squared Error of Catheter Advancement Length Estimated by the Manual A+B Method
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
Root mean squared error (RMSE), in millimeters, will be calculated as the square root of the arithmetic mean of the squared differences between the catheter advancement length estimated by the prespecified manual A+B measurement method and the CT-derived reference catheter advancement length.
The analysis population will include participants with both a valid manual A+B estimate and an evaluable CT-derived reference measurement.
Lower values indicate smaller overall estimation error, and larger individual errors have greater influence because differences are squared before averaging.
A 95% confidence interval will be estimated using participant-level bootstrap resampling.
|
At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
|
Mean Signed Error of Catheter Advancement Length Estimated by the Manual A+B Method
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
Mean signed error, in millimeters, will be calculated as the arithmetic mean of the catheter advancement length estimated by the prespecified manual A+B measurement method minus the CT-derived reference catheter advancement length.
The analysis population will include participants with both a valid manual A+B estimate and an evaluable CT-derived reference measurement.
Positive values indicate that the manual method estimates a longer advancement length than the reference, negative values indicate a shorter estimate, and zero indicates no average directional error.
A 95% confidence interval will be estimated using participant-level bootstrap resampling.
|
At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
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Mean Absolute Error of the AI-Based Automated A+B+Delta Method Within 24 Hours After Port Implantation and Before Catheter Manipulation
時間枠：Within 24 hours after port implantation and before any documented catheter manipulation, at the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care
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In the prespecified sensitivity subset of participants whose first eligible post-implantation noncontrast chest computed tomography examination is obtained within 24 hours after port implantation and before any documented catheter manipulation, mean absolute error (MAE), in millimeters, will be calculated as the arithmetic mean of the absolute differences between the catheter advancement length estimated by the locked AI-based automated A+B+Delta method and the CT-derived reference catheter advancement length.
Only participants with a valid automated output and an evaluable CT-derived reference measurement will be included.
Lower values indicate smaller estimation error.
A 95% confidence interval will be estimated using participant-level bootstrap resampling.
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Within 24 hours after port implantation and before any documented catheter manipulation, at the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care
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Proportion of AI-Based Automated A+B+Delta Estimates With Absolute Error Within 10 mm Within 24 Hours After Port Implantation and Before Catheter Manipulation
時間枠：Within 24 hours after port implantation and before any documented catheter manipulation, at the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care
|
In the prespecified sensitivity subset of participants whose first eligible post-implantation noncontrast chest computed tomography examination is obtained within 24 hours after port implantation and before any documented catheter manipulation, the proportion of evaluable participants whose absolute error is 10 mm or less will be calculated for the locked AI-based automated A+B+Delta method.
Absolute error will be defined as the absolute difference between the automated estimate and the CT-derived reference catheter advancement length.
The denominator will include participants with both a valid automated output and an evaluable CT-derived reference measurement.
The result will be reported as a percentage with a 95% Wilson score confidence interval.
The 10 mm threshold is a prespecified pragmatic technical accuracy criterion and not a clinical safety boundary.
|
Within 24 hours after port implantation and before any documented catheter manipulation, at the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care
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Bland-Altman Limits of Agreement for the CT-Derived Catheter Tip-to-Cavoatrial Junction Distance
時間枠：At repeat assessment of the CT-derived reference measurement after a 4-week washout period
|
Bland-Altman limits of agreement (LoA), in millimeters, will be calculated for the CT-derived catheter tip-to-cavoatrial junction distance in a prespecified random subset of 60 cases measured twice by the same radiologist after a 4-week washout.
Paired differences will be the second reading minus the first.
The mean difference and LoA (mean difference +/- 1.96 times the standard deviation of paired differences) will be reported.
Only cases evaluable at both readings will be analyzed.
The radiologist will use new identifiers and reshuffled images while blinded to the initial measurement.
The mean difference will have a t-based 95% confidence interval.
Separate two-sided 95% confidence intervals for each LoA will be calculated using the exact noncentral t method, assuming normally distributed paired differences.
Narrower limits indicate less within-observer measurement variation.
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At repeat assessment of the CT-derived reference measurement after a 4-week washout period
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Bland-Altman Limits of Agreement Between the AI-Based Automated A+B+Delta Estimate and the CT-Derived Reference
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
For participants with a valid automated output and an evaluable CT-derived reference measurement, paired differences, in millimeters, will be defined as the catheter advancement length estimated by the locked AI-based automated A+B+Delta method minus the CT-derived reference catheter advancement length.
The mean difference and lower and upper 95% limits of agreement (LoA), calculated as the mean difference +/- 1.96 times the standard deviation of paired differences, will be reported.
The mean difference will have a t-based 95% confidence interval.
Separate two-sided 95% confidence intervals for each LoA will be calculated using the exact noncentral t method, assuming normally distributed paired differences.
Positive differences indicate longer automated estimates than the reference, and negative differences indicate shorter estimates.
This analysis describes agreement and does not establish clinical interchangeability or safety.
|
At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
|
Bland-Altman Limits of Agreement Between the Manual A+B Estimate and the CT-Derived Reference
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
For participants with a valid manual A+B estimate and an evaluable CT-derived reference measurement, paired differences, in millimeters, will be defined as the catheter advancement length estimated by the prespecified manual A+B method minus the CT-derived reference catheter advancement length.
The mean difference and lower and upper 95% limits of agreement (LoA), calculated as the mean difference +/- 1.96 times the standard deviation of paired differences, will be reported.
The mean difference will have a t-based 95% confidence interval.
Separate two-sided 95% confidence intervals for each LoA will be calculated using the exact noncentral t method, assuming normally distributed paired differences.
Positive differences indicate longer manual estimates than the reference, and negative differences indicate shorter estimates.
This analysis describes agreement and does not establish clinical interchangeability or safety.
|
At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
その他の成果指標
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Huber Regression Slope for the Association Between the Port Implantation-to-CT Interval and Signed Error
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
In this prespecified exploratory analysis, the association between the interval from port implantation to the first eligible post-implantation noncontrast chest computed tomography examination and the signed error of the locked AI-based automated A+B+Delta method will be assessed among participants with a valid automated output and an evaluable CT-derived reference measurement.
Signed error, in millimeters, will be defined as the automated catheter advancement length estimate minus the CT-derived reference length.
The interval, recorded in hours, will be transformed as log2(1 + hours).
A robust Huber regression slope with a two-sided 95% confidence interval will be reported; Spearman's rank correlation coefficient with a two-sided 95% confidence interval will be an auxiliary analysis.
Raw and Holm-adjusted Spearman p-values will be reported.
The slope is expressed in millimeters per log2(1 + hours); positive values indicate increasingly positive signed error with longer intervals.
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At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
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Huber Regression Slope for the Association Between the Port Implantation-to-CT Interval and Absolute Error
時間枠：At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
|
In this prespecified exploratory analysis, the association between the interval from port implantation to the first eligible post-implantation noncontrast chest computed tomography examination and the absolute error of the locked AI-based automated A+B+Delta method will be assessed among participants with a valid automated output and an evaluable CT-derived reference measurement.
Absolute error, in millimeters, will be defined as the absolute difference between the automated catheter advancement length estimate and the CT-derived reference length.
The interval, recorded in hours, will be transformed as log2(1 + hours).
A robust Huber regression slope with a two-sided 95% confidence interval will be reported; Spearman's rank correlation coefficient with a two-sided 95% confidence interval will be an auxiliary analysis.
Raw and Holm-adjusted p-values will be reported for the Spearman test.
Slope is in millimeters per log2(1 + hours); positive values indicate increasing absolute error.
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At the first eligible post-implantation noncontrast chest computed tomography examination obtained during routine care, before any documented catheter manipulation or revision
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協力者と研究者
ここでは、この調査に関係する人々や組織を見つけることができます。
研究記録日
これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。
主要日程の研究
研究開始 (推定)
2026年10月5日
一次修了 (推定)
2026年11月1日
研究の完了 (推定)
2026年11月1日
試験登録日
最初に提出
2026年8月24日
QC基準を満たした最初の提出物
2026年8月27日
最初の投稿 (実際)
2026年8月28日
学習記録の更新
投稿された最後の更新 (実際)
2026年9月16日
QC基準を満たした最後の更新が送信されました
2026年9月14日
最終確認日
2026年8月1日
詳しくは
本研究に関する用語
その他の研究ID番号
- E-10840098-50.04-1975
個々の参加者データ (IPD) の計画
個々の参加者データ (IPD) を共有する予定はありますか?
未定
IPD プランの説明
The plan to share de-identified individual participant data has not yet been finalized.
Any future sharing decision will be subject to applicable ethics approval, participant consent, institutional policy, and data protection requirements.
医薬品およびデバイス情報、研究文書
米国FDA規制医薬品の研究
いいえ
米国FDA規制機器製品の研究
いいえ
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