Abstract #1094

Self-Calibrated Phase-Correction for Superresolution of RASER at 7 T

Ute Goerke¹

¹CMRR/Radiology, University of Minnesota, Minneapolis, MN, United States

RASER (rapid acquisition with sequential excitation and refocusing) is an ultrafast imaging technique based on spatiotemporal encoding (SPEN). The excitation with a chirp-pulse with a low bandwidth-time product (R-value) introduces blurring in the SPEN dimension. Superresolution (SR) which removes the blurring fails as a result of the spatially varying B₁-phase produced by radio-frequency coils at ultrahigh fields. A novel iterative phase-correction of the SR-algorithm is presented. It is shown that the spatial resolution and the SNR of blurred RASER images acquired at 7 T are significantly improved employing phase-corrected SR.

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