Highly-Accelerated Dynamic Non-Contrast MRA using a Combination of Compressed Sensing & Parallel Imaging

Ricardo Otazo¹, Pippa Storey¹, Daniel Kim¹, Daniel K. Sodickson¹, Vivian S. Lee¹

Non-gadolinium MRA with varying flow sensitivities can be performed by acquiring sets of FSE images in systole and diastole with different refocusing flip angles, so that the subtraction of systolic and diastolic images provides angiograms that resemble time-resolved MRA. In order to achieve feasible acquisition times and reduce sensitivity to subject motion, accelerated imaging is required. The inherent sparsity of the angiograms and the presence of correlations among the images acquired with different flip angles make the technique a good candidate for compressed sensing. We demonstrate feasibility of 16-fold accelerated dynamic non-contrast MRA using compressed sensing and parallel imaging.