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Conventional and Reduced Radiation Dose of 16-MDCT for Detection of Nephrolithiasis and Ureterolithiasis

Erik K. Paulson1, Carolyn Weaver1,2, Lisa M. Ho1, Lucie Martin1,3, Jianying Li1, James Darsie1 and Donald P. Frush1

1 Department of Radiology, Duke University Medical Center, Box 3808, Durham, NC 27710.
2 Present address: Northside Radiology Associates, Atlanta, GA.
3 Present address: Department of Radiology, Montfort Hospital, Ottawa, ON, Canada.


Figure 1
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  		Fig. 1A —Effect of noise addition (simulated tube current reduction) in 28-year-old man with renal colic. Axial unenhanced CT image obtained at 160 mA through midportion of kidneys shows subtle calcification (arrow) in right renal collecting system.

 

Figure 2
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  		Fig. 1B —Effect of noise addition (simulated tube current reduction) in 28-year-old man with renal colic. With noise addition to simulate tube current of 70 mA, this calcification persists.

 

Figure 3
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  		Fig. 2A —Effect of noise addition (simulated tube current reduction) in 44-year-old obese woman with renal colic. Axial unenhanced CT image obtained with 380 mA through lower aspect of kidneys shows single right renal calculus (arrow).

 

Figure 4
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  		Fig. 2B —Effect of noise addition (simulated tube current reduction) in 44-year-old obese woman with renal colic. With noise addition to simulate tube current of 70 mA, this stone is still evident.

 

Figure 5
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  		Fig. 2C —Effect of noise addition (simulated tube current reduction) in 44-year-old obese woman with renal colic. Axial CT image at level of acetabulum shows periuterine calcification (arrowhead).

 

Figure 6
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  		Fig. 2D —Effect of noise addition (simulated tube current reduction) in 44-year-old obese woman with renal colic. With simulated tube currents of 130 mA (D) and 70 mA (E), this periuterine calcification becomes less evident. At simulated tube current of 70 mA (E), increased noise could be mistaken for ureteral calculi (arrows, E).

 

Figure 7
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  		Fig. 2E —Effect of noise addition (simulated tube current reduction) in 44-year-old obese woman with renal colic. With simulated tube currents of 130 mA (D) and 70 mA (E), this periuterine calcification becomes less evident. At simulated tube current of 70 mA (E), increased noise could be mistaken for ureteral calculi (arrows, E).

 

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