Effect of subject-specific head morphometry on specific absorption rate estimates in parallel-transmit MRI at 7 T.

ABSTRACT:

Purpose

To assess the accuracy of morphing an established reference electromagnetic head model to a subject-specific morphometry for the estimation of specific absorption rate (SAR) in 7T parallel-transmit (pTx) MRI.

Methods

Synthetic T₁ -weighted MR images were created from three high-resolution open-source electromagnetic head voxel models. The accuracy of morphing a "reference" (multimodal image-based detailed anatomical [MIDA]) electromagnetic model into a different subject's native space (Duke and Ella) was compared. Both linear and nonlinear registration methods were evaluated. Maximum 10-g averaged SAR was estimated for circularly polarized mode and for 5000 random RF shim sets in an eight-channel transmit head coil, and comparison made between the morphed

SUBMITTER: Jeong H 

PROVIDER: S-EPMC10952207 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature