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Radiation Dose Associated with Unenhanced CT for Suspected Renal Colic: Impact of Repetitive Studies

Sharyn I. Katz1,2, Sanjay Saluja1, James A. Brink1 and Howard P. Forman1

1 Department of Radiology, Yale–New Haven Hospital, Yale University School of Medicine, New Haven, CT 06520-8042.
2 Present address: Department of Radiology, Hospital of the University of Pennsylvania, 1 Silverstein Bldg., 3400 Spruce St., Philadelphia, PA 19104.


Figure 1
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  		Fig. 1 —Bar graph shows subset of 176 patients who had three or more unenhanced CT examinations for suspected renal colic during 6-year study period. One patient underwent 18 CT examinations.

 

Figure 2
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  		Fig. 2 —Estimated effective dose delivered with unenhanced CT examinations for suspected renal colic. Bar graph shows range of estimated effective doses reaches maximum of 150 mSv. MDCT (black bars) delivers slightly higher dose than single-detector CT (gray bars).

 

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