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1 From the Division of Abdominal Imaging and Intervention, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Wht-270, 32 Fruit St, Boston, MA 02134 (M.K.K., M.M.M.); GE Medical Systems, Waukesha, Wis (T.L.T.); Siemens Medical Solutions, Forchheim, Germany (B.S.); Toshiba America Medical Systems, Tustin, Calif (B.L.W.); Philips Medical Systems, Cleveland, Ohio (H.T.M.); and Department of Radiology, Emory University School of Medicine, Emory University Hospital, Atlanta, Ga (S.S.). Received July 25, 2003; revision requested September 30; final revision received and accepted December 9. Address correspondence to S.S. (e-mail: mannudeep_k_kalra@yahoo.com).
Introduction of slip-ring technology with subsequent development of single– and multi–detector row helical computed tomographic (CT) scanners have expanded the applications of CT, leading to a substantial increase in the number of CT examinations being performed. Owing to concerns about the resultant increase in associated radiation dose, many technical innovations have been introduced. One such innovation is automatic tube current modulation. The purpose of automatic tube current modulation is to maintain constant image quality regardless of patient attenuation characteristics, thus allowing radiation dose to patients to be reduced. This review discusses the principles, clinical use, and limitations of different automatic tube current modulation techniques.
© RSNA, 2004
Index terms: Computed tomography (CT), image quality • Computed tomography (CT), radiation exposure • Computed tomography (CT), technology • Radiations, exposure to patients and personnel • Review
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