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Helical CT of Urinary Calculi

Effect of Stone Composition, Stone Size, and Scan Collimation

K. Chee Saw1, James A. McAteer2, Ashish G. Monga3, Gonzalo T. Chua3, James E. Lingeman1 and James C. Williams, Jr.2

1 Methodist Hospital Institute for Kidney Stone Disease, 1891 N. Senate Blvd., Ste. 700, Indianapolis, IN 46202.
2 Department of Anatomy and Cell Biology, Indiana University School of Medicine, 635 Barnhill Dr., Indianapolis, IN 46202.
3 Department of Radiology, Methodist Hospital, 1701 N. Senate Blvd., Indianapolis, IN 46202.



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  		Fig. 1A. —Helical CT scans of a single kidney stone. Scans were obtained at three collimation widths: 1 mm (A), 3 mm (B), and 10 mm (C).

 


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  		Fig. 1B. —Helical CT scans of a single kidney stone. Scans were obtained at three collimation widths: 1 mm (A), 3 mm (B), and 10 mm (C).

 


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  		Fig. 1C. —Helical CT scans of a single kidney stone. Scans were obtained at three collimation widths: 1 mm (A), 3 mm (B), and 10 mm (C).

 


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  		Fig. 2. —Graph shows measured ratio of attenuation (H) for kidney stones scanned with helical CT at 1:1 pitch at 3- and 1-mm collimations (reconstructed at 3- or 1-mm slice thicknesses, respectively). At 3-mm collimation, partial volume effect reduces apparent density, as shown by values less than one. Shaded area indicates range predicted by model, with top of shaded area being maximum value predicted, and bottom of shaded area being minimum value predicted (if stone falls between reconstruction slice locations).

 


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  		Fig. 3. —Graph as in Figure 2, but ratio is 10-mm collimation to 1-mm collimation. Shaded region shows range of ratio that is predicted by model.

 

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