Fig. 2From: The diagnostic value of SPECT/CT in predicting the occurrence of osteonecrosis following femoral neck fracture: a prospective cohort studyQuantitative analysis of the head-to-head uptake ratio with ROI in a 3-cm circle, excluding the cortical bone of femur head. a,d ROI measured in axial view of SPECT/CT. b,e ROI in coronal view. c,f ROI in sagittal view. Three independently measured values of pixels are summated to an average value of ROIBack to article page