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DOI: 10.1148/radiol.2322031151
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Radiation from "Extra" Images Acquired with Abdominal and/or Pelvic CT: Effect of Automatic Tube Current Modulation1

Mannudeep K. Kalra, MD, DNB, Michael M. Maher, MD, FFR (RCSI), FRCR, Thomas L. Toth, DSc, Ravi S. Kamath, MD, PhD, Elkan F. Halpern, PhD and Sanjay Saini, MD

1 From the Division of Abdominal Imaging and Intervention, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, White 270-E, 55 Fruit St, Boston, MA 02114 (M.K.K., M.M.M., R.S.K., E.F.H., S.S.); and GE Medical Systems, Waukesha, Wis (T.L.T.). Received July 25, 2003; revision requested October 2; final revision received December 18; accepted January 29, 2004. Address correspondence to M.K.K. (e-mail: mannudeep_k_kalra@yahoo.com).



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  		Figure 1. Transverse contrast material-enhanced supradiaphragmatic abdominal CT image acquired with manual selection of tube current (115 mAs, 140 kVp) shows pulmonary nodules (arrows) in the right lung of a 60-year-old woman with colorectal cancer.

 


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  		Figure 2a. Transverse abdominal CT images acquired with ATCM (selection of 75-380 mAs, 140 kVp, 15-HU noise index) in a 57-year-old man with abdominal pain show no abnormalities. Tube current-time products for (a) supradiaphragmatic and (b) infrapubic images were 49 and 58 mAs, respectively.

 


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  		Figure 2b. Transverse abdominal CT images acquired with ATCM (selection of 75-380 mAs, 140 kVp, 15-HU noise index) in a 57-year-old man with abdominal pain show no abnormalities. Tube current-time products for (a) supradiaphragmatic and (b) infrapubic images were 49 and 58 mAs, respectively.

 


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  		Figure 3a. Transverse abdominal CT images acquired with ATCM (selection of 75-380 mAs, 140 kVp, 15-HU noise index) in a 71-year-old man with pancreatitis. (a) Supradiaphragmatic image (tube current-time product, 77 mAs) shows bilateral pleural effusions. (b) Infrapubic image (tube current-time product, 103 mAs) shows right-sided inguinal hernia (arrow).

 


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  		Figure 3b. Transverse abdominal CT images acquired with ATCM (selection of 75-380 mAs, 140 kVp, 15-HU noise index) in a 71-year-old man with pancreatitis. (a) Supradiaphragmatic image (tube current-time product, 77 mAs) shows bilateral pleural effusions. (b) Infrapubic image (tube current-time product, 103 mAs) shows right-sided inguinal hernia (arrow).

 




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