CT COLONOGRAPHY: QUALITY ASSURANCE AND FUTURE PROSPECTS

Abstract

CT colonography (CTC) is a non-invasive examination technique with approximately 90% sensitivity and specificity for colorectal neoplasms ≥10 mm, although its use in Japan remains limited owing to a lack of awareness and shortage of experienced readers. Accuracy can be maintained through appropriate bowel preparation, colonic distention, low-dose scanning, and standardized interpretation; moreover, CTC has a low complication rate and is effective for triaging positive screening cases, reducing colonoscopy volume and waiting times. Recent legal changes enabling radiologic technologists to perform CTC independently may improve access in underserved areas. With further standardization and formal inclusion in guidelines, CTC could be integrated into colorectal cancer screening programs, improving both efficiency and outcomes.