Parallel transmit coil dimensions affect SAR sensitivity to motion at 7T

Plumley, Alix, Schmid, Philip and Kopanoglu, Emre ORCID: https://orcid.org/0000-0001-8982-4441 2021. Parallel transmit coil dimensions affect SAR sensitivity to motion at 7T. Presented at: ISMRM & SMRT Annual Meeting & Exhibition, Virtual, 15-20 May 2021.

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Abstract

Subject motion in parallel-transmit (pTx) causes channels’ electric field interference patterns to change, influencing SAR distributions. This can cause safety limits to be exceeded when SAR-constrained pulses are designed for one position. Here, we consider effects of pTx coil dimensions on SAR sensitivity to motion by simulating 6 differently-sized coil models, and evaluating SAR at 19 displaced positions. Our results agree with those previously reported for the similar-sized coil, but SAR sensitivity was generally lower for larger coils, and higher for smaller coils, with maximum motion-induced local-SAR increase of 3.8-fold and 1.6-fold for the smallest and largest coil models, respectively.

Item Type:	Conference or Workshop Item - unpublished
Status:	Unpublished
Schools:	Schools > Psychology
Date of First Compliant Deposit:	24 March 2021
Date of Acceptance:	24 February 2021
Last Modified:	12 Aug 2026 11:04
URI:	https://orca.cardiff.ac.uk/id/eprint/140084

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