Celik S, et al. - In this retrospective analysis of patients who had stone analysis, non-contrast computed tomography (NCCT) images, and underwent percutaneous nephrolithotomy between 2013 and 2016, researchers assessed the predictive value of stone measurements by including a novel method on NCCT images for stone composition. Using NCCT images, they determined Hounsfield unit (HU) values (maximum (HU_max), minimum (HU_min), and average (HU_ave) of HU values). To calculate HU_diff, the difference between the HU_max and the HU_min values was determined. Findings revealed that mineral complexity was significantly predicted by HU_diff and HU_ave. For identification of mono-mineral stones, 81.8% sensitivity and 67.2% specificity was shown by HU_diff of < 341.5 HU.