Improving radiofrequency power and specific absorption rate management with bumped transmit elements in ultra-high field MRI.

ABSTRACT:

Purpose

In this study, we investigate a strategy to reduce the local specific absorption rate (SAR) while keeping B1+ constant inside the region of interest (ROI) at the ultra-high field (B₀ ≥ 7T) MRI.

Methods

Locally raising the resonance structure under the discontinuity (i.e., creating a bump) increases the distance between the accumulated charges and the tissue. As a result, it reduces the electric field and local SAR generated by these charges inside the tissue. The B1+ at a point that is sufficiently far from the coil, however, is not affected by this modification. In this study, three different resonant elements (i.e., loop coil, snake antenna, and fractionated dipole [FD]) are investigated. For experimental validation, a bumped FD is further investigated a

SUBMITTER: Sadeghi-Tarakameh A 

PROVIDER: S-EPMC7722062 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature