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(Radiographics. 2000;20:1787-1806.)
© RSNA, 2000

IMAGING & THERAPEUTIC TECHNOLOGY

Multisection CT: Scanning Techniques and Clinical Applications1

Jonas Rydberg, MD, Kenneth A. Buckwalter, MD, Karen S. Caldemeyer, MD, Michael D. Phillips, MD, Dewey J. Conces, Jr, MD, Alex M. Aisen, MD, Scott A. Persohn, RT and Kenyon K. Kopecky, MD

1 From the Department of Radiology, Indiana University School of Medicine, Indianapolis. Recipient of a Certificate of Merit award for a scientific exhibit at the 1999 RSNA scientific assembly. Received March 1, 2000; revision requested April 11; final revision received June 22; accepted July 6. Address correspondence to K.K.K., Department of Radiology, Indiana University Hospital, Rm 0615, 550 N University Blvd, Indianapolis, IN 46202-5253 (e-mail: kkopecky@iupui.edu).

Multisection computed tomography (CT) was introduced in 1992 with the advent of dual-section–capable scanners and was improved in 1998 following the development of quad-section technology. With a recent increase in gantry speed from one to two revolutions per second, multisection CT scanners are now up to eight times faster than conventional single-section helical CT scanners. The benefits of quad-section CT relative to single-section helical CT are considerable. They include improved temporal resolution, improved spatial resolution in the z axis, increased concentration of intravascular contrast material, decreased image noise, efficient x-ray tube use, and longer anatomic coverage. These factors substantially increase the diagnostic accuracy of the examination. The multisection CT technique has enabled faster and superior evaluation of patients across a wide spectrum of clinical indications. These include isotropic viewing, musculoskeletal applications, use of multiplanar reformation in special situations, CT myelography, long coverage and multiphase studies, CT angiography, cardiac scoring, evaluation of brain perfusion, imaging of large patients, evaluation of acute chest pain or dyspnea, virtual endoscopy, and thin-section scanning with retrospective image fusing. Multisection CT is superior to single-section helical CT for nearly all clinical applications.

Index Terms: Computed tomography (CT), helical • Computed tomography (CT), technology • Computed tomography (CT), thin-section




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