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DOI:10.2214/AJR.04.1513
AJR 2006; 186:673-679
© American Roentgen Ray Society

Clinical Obser vations

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

Stefania Rizzo1, Mannudeep Kalra1,2, Bernhard Schmidt3, Tejas Dalal1,4, Christoph Suess3, Thomas Flohr3, Michael Blake1 and Sanjay Saini2

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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