Keywords: Data Acquisition, Data AcquisitionEcho planar time-resolved imaging (EPTI) is a recently developed multi-shot EPI method that provides time-resolved multi-echo images and providing multi-contrast images. Based on this basis, here we present Multi-TR-EPTI, a technique developed to achieve distortion-free and Multi-parametric quantitative MRI including T1, T2, T2*, and PD mapping. Multi-TR-EPTI exploits an optimized spatiotemporal CAIPI encoding in the k-TE-TR space.which can recover the k-TE-TR space within the same shot number as the original EPTI. A subspace reconstruction was employed to obtain hundreds of high-quality multi-contrast images at sub-millisecond temporal increments. Multi-TR-EPTI adopts different TRs to provide T1 contrast while improving scan efficiency.
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