Computed Tomography Colonography Technique: The Role of Intracolonic Gas Volume

Figure 2

Axial CTC image through the lower rectum demonstrating aliasing artifact from a right hip arthroplasty which spuriously creates pixels with Hounsfield unit values of less than −350 in the soft tissues. This resulted in inaccurate segmentation along the gas column (green ROI). All patients with hip arthroplasty devices were therefore excluded from this study.