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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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