Visualization of colorectal polyps with spiral CT colography: evaluation of processing parameters with perspective volume rendering.

摘要: PURPOSE: To evaluate two key processing steps for detection of colon polyps with spiral computed tomographic (CT) colography perspective volume rendering (PVR): image reconstruction and opacity assignment the attenuation data. MATERIALS AND METHODS: Spiral CT was performed in 10 patients known confirmed at colonoscopy, detailed quantitative analyses were data obtained four. First, anatomic fidelity three-dimensional (3D) images generated from two-dimensional (2D) source equal voxel dimensions (87%-90% overlap) compared 3D 2D unequal (0%-80% overlap). Next, relative colorectal to adjacent structures evaluated various threshold settings. Then, step sigmoidal functions respect smoothness edge sharpness. RESULTS: PVR after interpolation reconstructed least 60% overla...