Coronary flow measurements can provide important information, e.g. to assess coronary stenosis, but remain challenging due to the need for high spatio-temporal resolution in the presence of heart and respiratory motion. Progress has been made by using spiral acquisitions enabling data acquisition within a breath hold. We combined spiral SPiRIT flow measurements with UNFOLD, a technique that allows for further data undersampling and scan time shortening (here by a factor of 2), to achieve coronary flow measurements with a spatio-temporal resolution of 1×1×8mm³/<15.5msec. The combined UNFOLD-spiral approach was implemented into different spiral sampling patterns and evaluated in healthy volunteers.
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