Technical artifacts are easy to recognize. Breath-hold and motion artifacts are usually best seen with sagittal or coronal oblique planes which better display the motion along the z-axis (Fig. 14.22). Metallic artifacts cause beam-hardening artifacts, and can obscure the colon lumen. Stairstep artifacts are usually not seen with thin slice thickness, but with thicker slice thicknesses (such as 5 mm), and are seen on 3D endoluminal images and 2D MPR images, most commonly within the rectum and cecum, where there are great changes in the luminal diameter along the z-axis.
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