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Spiral computed tomography is a computed tomography〔(Avinash C. Kak and Malcolm Slaney ) (2001). (Principles of Computerized Tomographic Imaging ). (Society for Industrial and Applied Mathematics ) ISBN 978-0-89871-494-4 / ISBN 0-89871-494-X.〕 technology involving movement in a helical pattern for the purpose of increasing resolution. Most modern hospitals currently use spiral CT scanners. CT beam types have included parallel beams, fan-beams, and cone-beams. ==SSCT and MSCT== Willi Kalender, who is credited with the invention prefers the term ''Spiral'' scan CT,〔Kalender WA (1994). ("Technical foundations of spiral CT" ) (Semin Ultrasound CT MR ) 15: (2) 81-89.〕 arguing that spiral is synonymous with helical: for example as used in 'spiral staircase'.〔Kalender WA (1994). ("Spiral or helical CT: right or wrong?" ) (Radiology ) 193: (2) 583.〕 Since its invention by Kalender in the 1980s, helical scan CT machines have steadily increased the number of rows of detectors (slices) they deploy. The prototype 16 multi-slice scanner was introduced in 2001 and in 2004, 64 multislice scanners are on the market. These can produce an image in less than a second and thus can obtain images of the heart and its blood vessels (coronary vessels) as if frozen in time. The earliest devices, developed in 1989, were called "SSCT", for "single-slice spiral computed tomography". In 1998, "MSCT" or "multi-slice spiral computed tomography" was introduced. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Spiral computed tomography」の詳細全文を読む スポンサード リンク
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