Apparent diffusion coefficient of kidneys with non-contrast magnetic resonance angiography for functional and anatomical assessment in renal artery stenosis

Figure 6 Unilateral renal artery stenosis with normal-sized kidney. A: T2W magnetic resonance (MR) image (coronal plane) showing bilateral normal-sized kidneys (RK 8.6 cm, LK 10.7 cm); B: Non-contrast MR angiography (INHANCE ) in axial plane depicting severe right renal artery stenosis at the ostium; C-H: Diffusion-weighted MR image (C, E, G, I) in the axial plane with corresponding apparent diffusion coefficient (ADC) map (D, F, H, J) of bilateral kidneys showing manually drawn region-of-interest (ROI) placed in the upper (C, D), middle (E, F) pole of bilateral kidneys, lower (G, H) pole of the right kidney and lower (I, J) pole region of left kidney. The ROI is placed in the cortex and medulla on both sides. Mean cortical ADC and medullary ADC values of the right kidney were 165 × 10^-3 mm²/s and 1.63 × 10^-3 mm²/s, respectively. Mean cortical ADC and medullary ADC values of the left kidney were 198 × 10^-3 mm²/s and 1.84 × 10^-3 mm²/s, respectively.