Abstract #3965

Simulation of SAR and B1+ homogeneity change with subject movement using 16ch transceiver coil at 7T

Donghyuk Kim¹, Kyoung-Nam Kim², and Chan Hong Moon¹

¹Department of Radiology, University of Pittsburgh, Pittsburgh, PA, United States, ²Department of Biomedical Engineering, Gachon University, Incheon, Korea, Republic of

Synopsis

Keywords: Safety, Safety

Motivation: SAR estimation at UHF is critical. Particularly when subject moves during scan, SAR could be changed significantly, potentially exceeding limit.

Goal(s): We investigated how SAR and B₁⁺ homogeneity is changed by head movement, coil tunning/matching(TM) and B₁⁺ shim.

Approach: Using EM simulation with human model with 16ch transceiver, B₁⁺ and SAR distribution was estimated for different head positions, coil TM and B₁⁺ shim.

Results: Head movement is main contributor to SAR increase; but also suboptimal coil TM and B₁⁺ shim contributing to the variation.

Impact: Estimation of B1+ and SAR changes by subject motion would improve scan safety as well as B1+ shim approach.

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