Fig. 1

ROI method and FT method for measuring FA and ADC. a In the ROI method, a region of interest was placed in expected axial DTI without fiber tracking. To minimize partial volume effects, we set 4 voxels as a ROI in the lumbar spinal nerve. b In the FT method using fiber tracking, FA and ADC values were calculated from the drawn fibers passing through the target nerve only in reference to 3 smaller vertical displays of the reformatted coronal and sagittal images as well as original axial images on the right