An imaging technique, coined epi-based Sub-millisecond Periodic Event Encoded Dynamic Imaging, or epi-SPEEDI, has been shown capable of visualizing the rapid opening and closing of human aortic valve with sub-millisecond temporal resolution. However, the acquisition time of epi-SPEEDI was relatively long (8-10 breath holds). Herein, we report an alternative SPEEDI technique with a reduced FOV, which we call rFOV-SPEEDI, to shorten the scan times. This technique has been successfully applied to visualization of human aortic valve opening and closing with a temporal resolution of 0.6 ms, together with a scan time reduction of 32.5%.
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