Head-and-neck multichannel B1⁺ mapping and RF shimming of the carotid arteries using a 7T parallel-transmit head coil.

ABSTRACT:

Purpose

Neurovascular MRI suffers from a rapid drop in B₁ ⁺ into the neck when using transmit head coils at 7 T. One solution to improving B₁ ⁺ magnitude in the major feeding arteries in the neck is to use custom RF shims on parallel-transmit head coils. However, calculating such shims requires robust multichannel B₁ ⁺ maps in both the head and the neck, which is challenging due to low RF penetration into the neck, limited dynamic range of multichannel B₁ ⁺ mapping techniques, and B₀ sensitivity. We therefore sought a robust, large-dynamic-range, parallel-transmit field mapping protocol and tested whether RF shimming can improve carotid artery B₁ ⁺ magnitude in p

SUBMITTER: de Buck MHS 

PROVIDER: S-EPMC10962593 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature