Non-enhanced MR angiography of renal artery using inflow-sensitive inversion recovery pulse sequence: A prospective comparison with enhanced CT angiography

Optimal Blood Suppression Inversion Time Based on Breathing Rates and Heart Rates to Improve Renal Artery Visibility in Spatial Labeling with Multiple Inversion Pulses: A Preliminary Study

“…Non-contrast enhanced MRA such as SSFP and IFIR has been previously used to image renal vasculature ( 5 6 9 12 ) . However, the renal artery signal on axial plane was acquired in about 5-6 minutes ( 5 9 ), which was too long to depict arterial segmental branches owing to the motion-related blurring in the distal renal arteries ( 19 ). In our study, the SLEEK NCE-MRA sequence was used to delineate renal artery on coronal plane tailored to the kidney shape ( 17 ), and the acquisition time was only 2-4 minutes, which could help to improve the renal artery image quality.…”

“…In our study, the visibility of segmental branches in the renal parenchyma was boosted by a SLEEK NCE-MRA technique with various blood-suppression inversion times (BSP TI). BSP TI is described as the duration between the initial inversion pulse and time point that longitudinal magnetization of blood reaches zero (null) point, which was also named as inversion time after the spatial-selective inversion-recovery pulse (ssTI) in Time-SLIP NCE-MRA ( 8 ), TI (Time delay) in SSFP NCE-MRA ( 6 ) and BSP TI in NCE-MRA with inflow inversion recovery (IFIR) ( 9 ). For clear presentation of the renal artery, Shonai et al ( 8 ) suggested an ssTI of 1200-1800 ms with Time-SLIP NCE-MRA on a 1.5T scanner, Utsunomiya et al ( 10 ) suggested ssTI of 1300-1500 ms with Time-SLIP NCE-MRA, and Parienty et al ( 11 ) used 1100-1500 ms with three-dimensional (3D) balanced SSFP.…”

Influence of Renal Artery Variants, Number, Location, and Degree of Renal Artery Stenoses on the Atherosclerotic Burden of the Aorta

“…For this purpose, The North American Symptomatic Carotid Endarterectomy Trial criteria were applied at the greatest available magnification as has been recently described for renal arteries. 22 In all patients, any obliquities of vessel courses were accounted for using 3-dimensional (3D) picture archiving and communications systems. Following the most frequently used definition, 1 a reduction of lumen of more than 50% was considered a relevant RAS.…”

ACR Appropriateness Criteria ® Renal Transplant Dysfunction

“…Noncontrast MRA (NC-MRA) with steady-state free precession imaging can help avoid contrast utilization and avoid the risk of NSF [50]. Several studies have evaluated the value of NC-MRA in the evaluation of native RAS [51][52][53][54][55][56][57]. In these studies, NC-MRA of renal arteries demonstrated a sensitivity of 78% to 100%, a specificity of 82% to 99%, and an NPV of 95% to 100% in the detection of significant arterial stenosis (>50%).…”