Low-dose CT colonography in children: initial experience, technical feasibility, and utility

Area of Science:

• Pediatric Radiology
• Gastrointestinal Imaging
• Oncology

Background:

• CT colonography (CTC) is an established diagnostic tool for colorectal cancer and polyps in adults.
• Previous studies highlight CTC as safe, accurate, and non-invasive in adult populations.
• Limited data exists on the feasibility of CTC in pediatric patients.

Purpose of the Study:

• To assess the technical feasibility of performing low-dose CT colonography (CTC) in a pediatric population.
• To evaluate the safety and diagnostic accuracy of CTC in children.
• To compare radiation doses of CTC with standard barium enema in pediatric patients.

Main Methods:

• Eight pediatric patients (ages 3-17) underwent non-contrast CT colonography (CTC).
• Seven patients had CTC followed by same-day standard colonoscopy (SC); one patient had CTC after a failed SC.
• CTC findings were compared to SC results, and effective radiation dose was calculated and compared to barium enema.

Main Results:

• CT colonography (CTC) results demonstrated consistency with standard colonoscopy (SC) findings.
• Sensitivity for detecting polyps 5-10 mm was 100%, and 66.7% for polyps 10 mm or larger.
• The mean effective radiation dose for CTC was 2.17 mSv, significantly lower than the 5-6 mSv for pediatric barium enema.

Conclusions:

• CT colonography (CTC) is a well-tolerated, safe, and useful imaging modality for pediatric patients.
• The procedure is technically feasible in children, offering successful outcomes with low radiation exposure.
• Preliminary results indicate that CTC compares favorably to standard colonoscopy in pediatric evaluations.