Image quality and diagnostic accuracy of reduced-dose computed tomography enterography with model-based iterative...

Area of Science:

• Radiology
• Pediatric Gastroenterology
• Medical Imaging

Background:

• Crohn's disease (CD) often affects the terminal ileum in pediatric patients.
• Computed tomography enterography (CTE) is a key imaging modality for assessing CD activity.
• Reducing radiation dose in pediatric imaging is a critical concern.

Purpose of the Study:

• To evaluate the image quality and diagnostic accuracy of reduced-dose CTE (RD-CTE) compared to standard-dose CTE (SD-CTE).
• To assess the impact of RD-CTE on detecting active disease in the terminal ileum of pediatric CD patients.
• To quantify the radiation dose reduction achieved with RD-CTE.

Main Methods:

• Prospective study involving 18 pediatric patients with Crohn's disease.
• Patients were randomized into standard-dose CTE (SD-CTE) and reduced-dose CTE (RD-CTE) groups (n=9 each).
• Image quality, diagnostic accuracy for terminal ileum disease activity, and radiation dose were assessed.

Main Results:

• Objective image quality showed no significant intergroup differences, except for image sharpness.
• Reader confidence in detecting specific findings like ulcer and fat stranding was lower with RD-CTE.
• RD-CTE achieved comparable diagnostic accuracy to SD-CTE in identifying active terminal ileum disease.
• RD-CTE demonstrated substantial radiation dose reduction across all measured metrics (e.g., effective dose reduced from 4.4 to 0.7 mSv).

Conclusions:

• Reduced-dose CTE using model-based iterative reconstruction is a viable alternative for assessing active terminal ileum disease in pediatric Crohn's disease patients.
• This technique significantly reduces radiation exposure without compromising diagnostic accuracy.
• While some image quality aspects and reader confidence for specific findings may be reduced, the overall diagnostic performance is maintained.