September 17, 2025

Influence of Deactivated 8Tx/16Rx Transceiver Coil Elements on 3D SAR Distribution at 7T MRI of the Body Trunk

Key Points

Coil element deactivation raises peak sar significantly, with variations depending on coil position and model anatomy.
Increased peak sar was observed up to 77.61% in the Rosalind human model due to loop coil element deactivation.
Electromagnetic simulations were performed on ten different human models to assess sar distribution and safety metrics.
The findings underscore the need for safety factors in clinical practices when dealing with deactivated coil elements.

Abstract

Motivation: In 7T cardiac MRI, controlling peak SAR and SAR distribution is critical for safety. This study explores how deactivating loop coil elements affects these metrics. Goal(s): We assess the impact of coil element deactivation on SAR in a shared-conductor loop coil across different human models. Approach: Electromagnetic simulations were conducted on ten human models, analyzing SAR under normal conditions and with individual coil element deactivations. Results: Coil element deactivation increases peak SAR, up to 77.61% in the Rosalind model, and changes SAR distribution by up to 474% in the Laura model, varying with coil position and model anatomy. Impact: This study highlights the significant impact of coil element deactivation on SAR, requiring a safety factor in clinical routines to protect patients if coil elements become deactivated.

Influence of Deactivated 8Tx/16Rx Transceiver Coil Elements on 3D SAR Distribution at 7T MRI of the Body Trunk

Key Points

Abstract

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