Fig. 1From: Clinical utility of computed tomography Hounsfield characterization for percutaneous nephrolithotomy: a cross-sectional studyCalculus of left renal pelvis (a). Maximum/perpendicular diameters and ROI of the stone on soft tissue (b, c) and bone (d, e) window scans. Legend: A = area; P = perimeter; M = mean Hounsfield; SD = standard deviationBack to article page