Multidetector row scanners allow considerably reduced scan times, facilitating single breath hold studies for the majority of patients. As a consequence, image misregistration is practically eliminated and respiratory artefact significantly reduced (Hara et al. 2001). Moreover, distension also seems to be improved with a study by Hara et al. (2001) showing that suboptimal distension in at least one colonic segment was significantly more common with single detector row CT (40 of 77 patients, 52%) compared to multi-detector row CT (26 of 160 patients, 19%). This finding was presumably because patients do not have to retain the gas for as long and mucosal absorption is less critical.
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