Effect of Matrix Size on Lesion Detectability in CT Colonography

OBJECTIVES While computed tomography colonography (CTC) has become a non-invasive alternative to traditional colonoscopy, superficial lesions tend be harder detect, with reports of <2 mm in height being missed. Therefore, for the evaluation lesion detectability using CTC, optimizing scan parameters becomes important. In this study, we investigate effect reconstructed matrix size from CTC on conspicuity. METHODS A phantom was scanned, and images were 512, 768 1024 sizes same raw data. The image data each compared terms physical assessment task-transfer function (TTF) noise power spectrum (NPS), visual Scheffe's paired comparison. RESULTS Comparing that NPS higher high-frequency components. On other hand, TTF improved these larger along significant statistical differences assessment. CONCLUSION Larger (768 1024) improve conspicuity, thereby helping detect small (size<2 mm) CTC.