Figure 4From: Optimization of single shot 3D breath-hold non-enhanced MR angiography of the renal arteries Comparison of MRA MIPs obtained with BH and Nav MP-SSFP from two healthy volunteers. a) Normal acquisition from volunteer 1 where the image parameters for BH and Nav MP-SSFP were matched. b) MRA images from volunteer 2 when contralateral arteries were located at substantially different levels. The BH MP-SSFP images were obtained in two separate breath-holds for the left and right renal arteries (24 seconds each side). The Nav MP-SSFP images were obtained using a single think slab (96 mm, 7 minutes and 26 seconds acquisition time). The suboptimal visualization of the left renal artery on the Nav MP-SSFP was a consequence of fewer unsaturated spins reaching the caudally located left renal artery as compared with the right renal artery, within the inflow time specified by the TI.Back to article page