An 8-dipole transceive and 24-loop receive array for non-human primate head imaging at 10.5 T

Research output: Contribution to journalArticlepeer-review

Abstract

A 32-channel RF coil was developed for brain imaging of anesthetized non-human primates (rhesus macaque) at 10.5 T. The coil is composed of an 8-channel dipole transmit/receive array, close-fitting 16-channel loop receive array headcap, and 8-channel loop receive array lower insert. The transceiver dipole array is composed of eight end-loaded dipole elements self-resonant at the 10.5 T proton Larmor frequency. These dipole elements were arranged on a plastic cylindrical former, which was split into two to allow for convenient animal positioning. Nested into the bottom of the dipole array former is located an 8-channel loop receive array, which contains 5 × 10 cm2 square loops arranged in two rows of four loops. Arranged in a close-fitting plastic headcap is located a high-density 16-channel loop receive array. This array is composed of 14 round loops 37 mm in diameter and 2 partially detachable, irregularly shaped loops that encircle the ears. Imaging experiments were performed on anesthetized non-human primates on a 10.5 T MRI system equipped with body gradients with a 60 cm open bore. The coil enabled submillimeter (0.58 mm isotropic) high-resolution anatomical and functional imaging as well as tractography of fasciculated axonal bundles. The combination of a close-fitting loop receive array and dipole transceiver array allowed for a higher-channel-count receiver and consequent higher signal-to-noise ratio and parallel imaging gains. Parallel imaging performance supports high-resolution functional MRI and diffusion MRI with a factor of three reduction in sampling. The transceive array elements during reception contributed approximately one-quarter of the signal-to-noise ratio in the lower half of the brain, which was farthest from the close-fitting headcap receive array.

Original languageEnglish (US)
Article numbere4472
JournalNMR in biomedicine
Volume34
Issue number4
DOIs
StatePublished - Apr 2021

Bibliographical note

Funding Information:
This research is supported by NIH Grants P41 EB027061, NIH U01 EB025144, R01 NS081118, P30 NS076408 and University of Minnesota Udall Center Grant P50NS098573.

Publisher Copyright:
© 2021 John Wiley & Sons, Ltd.

Keywords

  • 10.5 T
  • 32-channel receive array
  • MRI
  • RF coil
  • dipole array
  • loop array
  • non-human primate
  • ultra-high field

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