Fig. 1

Establishment of ROIs for the renal DWI map. This coronal section of the renal DWI map came from the right kidney of a patient with LN. The line CD linked the renal middle pole and the renal hilus. The line AB was connected between the renal upper pole and the lower pole. Point O was the junction of the two lines. In order to acquire consecutive ADC data along the direction from the superficial cortex to the deep layer of the medulla, the rectangular ROI and squared ROI were placed in the renal-parenchyma BOLD image. One tip of the ROI was located on the renal-cortical surface. Another tip of the ROI was oriented toward the point O. The long axes of the rectangular ROI and squared ROI are shown by the green lines