فهرست نشریات علمی دسترسی آزاد ایران

Background: Improving imaging quality of non-contrast enhanced magnetic resonance angiography (NCE-MRA) is essential to those renal function impairment patients especially patients with renal segmental branch disease in the renal parenchyma. Objectives: To investigate the relation between blood flow velocity (BFV) and blood suppression inversion time (BSP TI) for optimal visualization of the renal artery in NCE-MRA by spatial labeling with multiple inversion pulses (SLEEK) sequence. Results: A negative relationship was found in vitro study between BFV and BSP TI with SLEEK sequence (r = -0.977, P = 0.023). For BSP TI = 200 ms, the simulated renal artery displayed hyper-intensity when simulated BFV = 96 - 128 cm/s and the maximum SNR was found when BFV = 128 cm/s (SNR = 0.927). For BSP TI = 500 ms, high signal appeared with BFV = 64 - 128 cm/s and the greatest SNR was found with BFV = 96 cm/s (SNR = 1.732). For BSP TI = 800 ms and 1100 ms, hyper-intensity arose with BFV = 16 - 128 cm/s and BFV = 6.4 - 128 cm/s separately, the highest SNR was described when BFV = 32 cm/s (SNR = 2.256) and BFV = 16 cm/s (SNR = 1.875). The different optimal BSP TI with best image quality was discovered in nine hypertensive patients. Conclusion: An optimal BSP TI based on BFV can improve the ability of delineating renal artery in SLEEK sequence.