Bench to bore ramifications of inter-subject head differences on RF shimming and specific absorption rates at 7T.

ABSTRACT:

Purpose

This study shows how inter-subject variation over a dataset of 72 head models results in specific absorption rate (SAR) and B₁⁺ field homogeneity differences using common shim scenarios.

Methods

MR-CT datasets were used to segment 71 head models into 10 tissue compartments. These head models were affixed to the shoulders and neck of the virtual family Duke model and placed within an 8 channel transmit surface-loop array to simulate the electromagnetic fields of a 7T imaging experiment. Radio frequency (RF) shimming using the Gerchberg-Saxton algorithm and Circularly Polarized shim weights over the entire brain and select slices of each model was simulated. Various SAR metrics and B₁⁺ maps were calculated to demonstrate the

SUBMITTER: Hardy BM 

PROVIDER: S-EPMC9376015 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature