Pippa Storey1, Ricardo Otazo1, Lazar Fleysher1, Niels Oesingmann2, Ruth P. Lim1, Vivian S. Lee1, Daniel K. Sodickson1
Non-contrast techniques for peripheral MRA exploit the pulsatility of arterial blood flow and involve subtraction of dark-blood images, acquired during fast flow, from bright-blood images, acquired during slow flow. The difference images, which depict the arteries, are sparse, although the source images are not. We show that higher acceleration factors can be achieved by performing subtraction on the raw data, before calculation of the GRAPPA weights, rather than on the final magnitude images. Depiction of large arteries is similar to that achieved with low acceleration factors and standard reconstruction, but depiction of small arteries and fine branch vessels is compromised.