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Abstract #1696

Correcting for gradient non-linearity in concurrent field monitoring

Paul I Dubovan1,2, Kyle M Gilbert1,2, and Corey A Baron1,2
1Medical Biophysics, Western University, London, ON, Canada, 2Centre for Functional and Metabolic Mapping, Western University, London, ON, Canada


Concurrent field monitoring (FM) via integration of field probes in a radiofrequency coil provides advantages over sequential field monitoring that include patient-specific corrections, as well as improvements to user workflow. However, specific design considerations can require placing field probes far from isocentre where gradient fields are no longer linear, reducing data integrity when fitting high order spatially varying terms. We propose a three-part correction algorithm that seeks to correct these errors and compare FM data, as well as reconstructed images, before and after correction. Correction improved integrity of FM data and enhanced quality of anatomical and diffusion weighted images.

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