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Abstract #2619

Unraveling bSSFP Phase: High Quality Field and Bias Mapping

Yiyun Dong1, Qing-San Xiang2, and Michael N Hoff3
1Physics, University of Washington, Seattle, WA, United States, 2Radiology, University of British Columbia, Vancouver, BC, Canada, 3Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, CA, United States

Synopsis

Keywords: Quantitative Imaging, Quantitative Imaging, B0 field mapping, field mapping, RF phase bias, RF phase offset

Motivation: MRI signal phase is crucial for various advanced MRI techniques, yet extracting needed phase components can be challenging.

Goal(s): To develop a comprehensive B0 field mapping procedure that includes full FOV, high quality characterization of RF receive-channel-specific bias using the bSSFP elliptical signal model for improved quantitative phase-sensitive MRI reconstructions.

Approach: Utilizing bSSFP geometry, the off-resonance phase accumulation at different stages of the sequence were calculated and leveraged to create refined B0 field and RF receive-channel-specific bias maps.

Results: Phantom data confirmed that the derived B0 field and RF receive-channel-specific bias maps are accurate with high SNR and full FOV coverage.

Impact: The proposed method leverages bSSFP's SNR efficiency to generate B0 and RF receive-channel bias maps with high-SNR, smooth variation, and full FOV coverage. This enables advanced phase-sensitive reconstructions and correction of phase-related system errors without requiring additional scans.

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