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Abstract #1426

Optimization and Comparison of Non-Contrast-Enhanced Inflow-Sensitive Inversion Recovery BSSFP for Renal and Mesenteric MRA at 1.5T and 3.0T

Caroline Denison Jordan1,2, Pauline Wong Worters1, Shreyas S. Vasanawala1, Bruce L. Daniel1, Marc T. Alley1, Moritz F. Kircher1, Robert J. Herfkens1, Brian A. Hargreaves1

1Radiology, Stanford University, Stanford, CA, United States; 2Bioengineering, Stanford University, Stanford, CA, United States

Contrast-enhanced MR angiography is a widely accepted technique for imaging the kidneys, but there are many reasons to explore non-contrast-enhanced MRA methods, including contraindication of gadolinium for patients with kidney disease. We evaluated one non-contrast enhanced MRI technique which has shown promising results: respiratory-triggered bSSFP with In Flow Inversion Recovery (IFIR). We optimized the inversion times at 1.5T and 3T, and then quantitatively and qualitatively compared images of renal and mesenteric arteries. We found better relative contrast and better visualization of renal and mesenteric arteries at 3T. An inversion time of 800 ms gave the optimal relative contrast.