Figure 13
From: Magnetic resonance angiography: current status and future directions
3D phase contrast MRA. (A) Contrast-enhanced MRA, (B) 3D phase contrast (PC) MRA, and (C) digital subtraction angiography in a patient with right renal artery stenosis (arrow). The signal void on the 3D PC MRA indicates that the stenosis is hemodynamically significant. The pressure gradient across the stenosis at catheter angiography was 18 mmHg.