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Abstract #0657

A simple method to estimate gradient delay for MRF

Koji Fujimoto1, Martijn A. Cloos2, and Tomohisa Okada1
1Human Brain Research Center, Graduate School of Medicine, Kyoto University, Kyoto, Japan, 2Center for Advanced Imaging Innovation and Research (CAI2R) and Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, NY, United States

A self-contained method to estimate the gradient delay for radial based MRF sequences based on the residual error after dictionary matching was presented. Under IRB approval, MRF was performed in two healthy volunteers at 7T. Images were reconstructed with varying degrees of gradient offset in the readout direction. The correlation of the dictionary match (i.e. inner product of the compressed data with the matched dictionary entry) was recorded. The average signal intensity within the head ROI in the “match map” gave the best result, and hence could be an easy and reliable metric for gradient delay correction.

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