Displacement current distribution on a high dielectric constant helmet and its effect on RF field at 10.5 T (447 MHz).

ABSTRACT:

Purpose

Investigating the designs and effects of high dielectric constant (HDC) materials in the shape of a conformal helmet on the enhancement of RF field and reduction of specific absorption rate at 10.5 T for human brain studies.

Methods

A continuous and a segmented four-piece HDC helmet fit to a human head inside an eight-channel fractionated-dipole array were constructed and studied with a phantom and a human head model using computer electromagnetic simulations. The simulated transmit efficiency and receive sensitivity were experimentally validated using a phantom with identical electric properties and helmet-coil configurations of the computer model. The temporal and spatial distributions of displacement currents on the HDC helmets were analyzed.

Results

Using

SUBMITTER: Gandji NP 

PROVIDER: S-EPMC9366929 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature