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Comparison of Angular and Combined Automatic Tube Current Modulation Techniques with Constant Tube Current CT of the Abdomen and Pelvis

¹ Department of Radiology, Massachusetts General Hospital, White 270, Boston, MA 02114.
² Present address: Department of Radiology, Emory University Hospital, 1364 Clifton Rd. NE, Atlanta, GA 30322.
³ Siemens Medical Solutions, Forchheim, Germany.
⁴ Present address: University of Vermont, Burlington, VT 05405.

Abstract

OBJECTIVE. The objective of our study was to compare image quality and radiation dose associated with abdominopelvic CT using combined modulation, angular modulation, and constant tube current.

CONCLUSION. Compared with using a constant tube current to scan the abdomen and pelvis, the use of a combined modulation technique results in a substantial reduction (42-44%) in radiation dose with acceptable image noise and diagnostic acceptability.

Keywords: abdomen • CT technique • pelvis • radiation dose • tube current modulation

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