Multisection CT: Scanning techniques and clinical applications

Multisection computed tomography (CT) was introduced in 1992 with the adven t of dual-section-capable scanners and was improved in 1998 following the d evelopment of quad-section technology. With a recent increase in gantry spe ed from one to two revolutions per second, multisection CT scanners are now up to eight times faster than conventional single-section helical CT scann ers. The benefits of quad-section CT relative to single-section helical CT are considerable. They include improved temporal resolution, improved spati al resolution in the z axis, increased concentration of intravascular contr ast material, decreased image noise, efficient x-ray tube use, and longer a natomic coverage. These factors substantially increase the diagnostic accur acy of the examination. The multisection CT technique has enabled faster an d superior evaluation of patients across a wide spectrum of clinical indica tions. These include isotropic viewing, musculoskeletal applications, use o f multiplanar reformation in special situations, CT myelography, long cover age 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.