Local and whole-body SAR in UHF body imaging: Implications for SAR matrix compression.

ABSTRACT:

Purpose

Transmit arrays for body imaging have characteristics of both volume and local transmit coils. This study evaluates two specific absorption rate (SAR) aspects, local and whole-body SAR, of arrays for body imaging at 7 T and also for a 3 T birdcage.

Methods

Simulations were performed for six antenna arrays at 7 T and one 3 T birdcage. Local SAR matrices and the whole-body SAR matrix were computed and evaluated with random shims. A set of reduced local SAR matrices was determined by removing all matrices dominated by the whole-body SAR matrix.

Results

The results indicate that all RF transmit coils for body imaging in this study are constrained by the local SAR limit. The ratio between local and whole-body SAR is nevertheless smaller for arrays with large FOV, a

SUBMITTER: Fiedler TM 

PROVIDER: S-EPMC11604848 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature