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- Title
Subject-specific models of susceptibility-induced B<sub>0</sub> field variations in breast MRI.
- Authors
Jordan, Caroline D.; Daniel, Bruce L.; Koch, Kevin M.; Yu, Huanzhou; Conolly, Steve; Hargreaves, Brian A.
- Abstract
Purpose: To rapidly calculate and validate subject-specific field maps based on the three-dimensional shape of the bilateral breast volume. Materials and Methods: Ten healthy female volunteers were scanned at 3 Tesla using a multi-echo sequence that provides water, fat, in-phase, out-of-phase, and field map images. A shape-specific binary mask was automatically generated to calculate a computed field map using a dipole field model. The measured and computed field maps were compared by visualizing the spatial distribution of the difference field map, the mean absolute error, and the 80% distribution widths of frequency histograms. Results: The 10 computed field maps had a mean absolute error of 38 Hz (0.29 ppm) compared with the measured field maps. The average 80% distribution widths for the histograms of all of the computed, measured, and difference field maps are 205 Hz, 233 Hz, and 120 Hz, respectively. Conclusion: The computed field maps had substantial overall agreement with the measured field maps, indicating that breast MRI field maps can be computed based on the air-tissue interfaces. These estimates may provide a predictive model for field variations and thus have the potential to improve applications in breast MRI. J. Magn. Reson. Imaging 2013;37:227-232. © 2012 Wiley Periodicals, Inc.
- Publication
Journal of Magnetic Resonance Imaging, 2013, Vol 37, Issue 1, p227
- ISSN
1053-1807
- Publication type
Article
- DOI
10.1002/jmri.23762