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"Fast Subject-Specific SAR and B1+ Prediction for PTx at 7T using only an Initial Localizer Scan"
Wyger Brink, Marius Staring, Rob Remis and Andrew Webb
Abstract
Ultra-high field (UHF) MRI (B0 > 7T) shows great promise to yield higher resolution structural and physiological information than available at 3T, particularly in the brain. Parallel RF transmission (PTx) is a key technology for UHF-MRI to address the increased spatial variations in the radiofrequency (RF) field distribution. However, currently it has failed to reach widespread clinical adoption. The main factors include the intersubject variability in local specific absorption rate (SAR) leading to large safety margins to ensure compliance to regulatory limits, and time-consuming B1+ calibration procedures required for tailored RF pulse design. Together, these technological challenges limit the clinical impact of PTx and the utilization of UHF-MRI.
In this work, we demonstrate a fast subject-specific method based on deep learning and a fast EM solver for predicting both SAR and B1+ fields using only a 9 second long localizer scan.
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Copyright © 2022 by the authors.
Published version © 2022 by .
Personal use of this material is permitted. However, permission to reprint or republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works, must be obtained from the copyright holder.
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BibTeX entry
| @inproceedings{Brink:2022, |
| author |
= {Brink, Wyger and Staring, Marius and Remis, Rob and Webb, Andrew}, |
| title |
= {Fast Subject-Specific SAR and B1+ Prediction for PTx at 7T using only an Initial Localizer Scan}, |
| booktitle |
= {ISMRM}, |
| address |
= {London, UK}, |
| month |
= {May}, |
| year |
= {2022}, |
| } |
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| last modified: 15-08-2022 |
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