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Multi–Detector Row CT: Principles and Practice for Abdominal Applications¹

¹ From the Department of Radiology, Harvard Medical School and Massachusetts General Hospital, 32 Fruit St, Boston, MA 02114. Received June 24, 2003; revision requested August 29; revision received September 25; accepted October 28. Address correspondence to the author (e-mail: ssaini@partners.org).

View larger version (56K): [in a new window]   Figure a. Simplified depictions of detector arrangements in CT gantries. (a) On single-detector row CT scanners, several hundred approximately 20-mm-long individual detectors are stacked opposite the x-ray tube. The section thickness is determined according to the collimation (shaded area) of the incident x-ray beam. (b) On multi-detector row CT scanners, the individual detectors are segmented into smaller elements along the z-axis. Hence, the detector arrangement has a gridlike configuration. Again, the shaded area represents the collimation of the incident x-ray beam; however, the section thickness is now determined according to the thickness of each detector row.

View larger version (55K): [in a new window]   Figure b. Simplified depictions of detector arrangements in CT gantries. (a) On single-detector row CT scanners, several hundred approximately 20-mm-long individual detectors are stacked opposite the x-ray tube. The section thickness is determined according to the collimation (shaded area) of the incident x-ray beam. (b) On multi-detector row CT scanners, the individual detectors are segmented into smaller elements along the z-axis. Hence, the detector arrangement has a gridlike configuration. Again, the shaded area represents the collimation of the incident x-ray beam; however, the section thickness is now determined according to the thickness of each detector row.