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Abstract #3347

Non-Contrast Outer Radial Inner Square K-Space Scheme (NORISKS)- a Breath-Held Balanced SSFP-Dixon Technique for Non-Contrast Enhanced Renal MRA

Manojkumar Saranathan1, Pauline W. Worters1, Shreyas Vasanawala1

1Radiology, Stanford University, Stanford, CA, United States

Nephrogenic systemic fibrosis (NSF) concerns associated with Gadolinium based contrast agents have spurred a resurgence in non-contrast enhanced MR Angiography (MRA) methods. Balanced steady state free precession (b-SSFP) imaging [1-3], due to its high SNR/CNR and short scan times, has been successful in coronary and renal angiography. Most current methods use respiratory gating which performs poorly during irregular breathing/sleep apnea. We propose a 3D b-SSFP-Dixon technique with a novel k-space segmentation scheme for breath-held (BH) non-contrast renal MRA without compromising coverage or spatial resolution. The sequence was tested on healthy subjects as well as patients.