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American Journal of Roentgenology, Vol 142, Issue 3, 545-548
Copyright © 1984 by American Roentgen Ray Society

Articles

Computed tomographic analysis of urinary calculi

JH Newhouse, EL Prien, ES Amis Jr, SP Dretler, and RC Pfister

Excised urinary calculi were subjected to computed tomographic (CT) scanning in an attempt to determine whether CT attenuation values would allow accurate analysis of stone composition. The mean, maximum, and modal pixel densities of the calculi were recorded and compared; the resulting values reflected considerable heterogeneity in stone density. Although uric acid and cystine calculi could be identified by their discrete ranges on one or more of these criteria, calcium-containing stones of various compositions, including struvite, could not be distinguished reliably. CT analysis of stone density is not likely to be more accurate than standard radiography in characterizing stone composition in vivo.
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