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Abstract #0761

Circular Echo-Planar Time-resolved Imaging (cEPTI) for Rapid Time-Resolved and Quantitative Imaging

Nan Wang1, Congyu Liao1, Siddharth Srinivasan1, Xiaozhi Cao1, Justin Haldar2, and Kawin Setsompop1
1Stanford University, Stanford, CA, United States, 2University of Southern California, Los Angeles, CA, United States


EPTI is a highly accelerated time-resolved imaging method for rapid quantitative imaging. To improve the spatiotemporal encoding efficiency of EPTI, we developed a “circular” EPTI sampling trajectory (cEPTI), designed to efficiently traverse a tight circular k-space coverage with full ramp-sampling. A systematic approach was also developed to characterize the noise and effective resolution of the EPTI acquisition and used to guide the optimization of cEPTI’s k-t sampling trajectory. The optimized cEPTI was demonstrated to be capable of producing a 50ms time-resolved series of distortion-free sharp brain images with varying T2* weightings at 1 mm in-plane resolution from a 195ms scan.

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