Diagnostic utility of attenuation measurement (Hounsfield units) in computed tomography stonogram in predicting the radio-opacity of urinary calculi in plain abdominal radiographs
International Urology and Nephrology, 05/18/2012
Chua ME et al. – Based on the constructed receiver operating characteristics curve, a threshold value of 498.5 Hounsfield units (HU) in CT stonogram was established as cut–off in determining whether a calculus is radio–opaque or radiolucent. The determined overall sensitivity and specificity of the set cut–off HU value are optimal. Stone size but not location affects the sensitivity and specificity.