A 31-channel integrated "AC/DC" B₀ shim and radiofrequency receive array coil for improved 7T MRI.

ABSTRACT:

Purpose

To test an integrated "AC/DC" array approach at 7T, where B₀ inhomogeneity poses an obstacle for functional imaging, diffusion-weighted MRI, MR spectroscopy, and other applications.

Methods

A close-fitting 7T 31-channel (31-ch) brain array was constructed and tested using combined Rx and ΔB₀ shim channels driven by a set of rapidly switchable current amplifiers. The coil was compared to a shape-matched 31-ch reference receive-only array for RF safety, signal-to-noise ratio (SNR), and inter-element noise correlation. We characterize the coil array's ability to provide global and dynamic (slice-optimized) shimming using ΔB₀ field maps and echo planar imaging (EPI) acquisitions.

Results

The SNR and average noise correlation were s

SUBMITTER: Stockmann JP 

PROVIDER: S-EPMC9899096 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature