Electromagnetic simulation of a 16-channel head transceiver at 7 T using circuit-spatial optimization.

ABSTRACT:

Purpose

With increased interest in parallel transmission in ultrahigh-field MRI, methods are needed to correctly calculate the S-parameters and complex field maps of the parallel transmission coil. We present S-parameters paired with spatial field optimization to fully simulate a double-row 16-element transceiver array for brain MRI at 7 T.

Methods

We implemented a closed-form equation of the coil S-parameters and overall spatial B1+ field. We minimized a cost function, consisting of coil S-parameters and the B1+ homogeneity in brain tissue, by optimizing transceiver components, including matching, decoupling circuits, and lumped capacitors. With this, we are able to compare the in silico results determined with and without B1+ homogeneity weighting. Using the known voltage

SUBMITTER: Li X 

PROVIDER: S-EPMC8124020 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature