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An 8 Dipole Transceive and 24 Loop Receive Array for Non-Human Primate Head Imaging at 10.5T

By Russell L Lagore, Steen Moeller, Jan Zimmermann, Lance DelaBarre, Jerahmie Radder, Andrea Grant, Kamil Uğurbil, Essa Yacoub, Noam Harel, Gregor Adriany

Posted 28 Aug 2020
bioRxiv DOI: 10.1101/2020.08.27.270744

A 32-channel RF coil was developed for brain imaging of anesthetized non-human primates (Rhesus Macaque) at 10.5 tesla. 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 tesla proton Larmor frequency. These dipole elements were arranged on a plastic cylindrical former which was split in 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 cm[2][1] 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 two partially detachable, irregularly shaped loops that encircle the ears. Imaging experiments were performed on anesthetized non-human primates on a 10.5 tesla 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 SNR and parallel imaging gains. Parallel imaging performance supports high resolution fMRI and dMRI with a factor of three reduction in sampling. The transceive array elements during reception contributed approximately one quarter of SNR in the lower half of the brain which was farthest from the close-fitting headcap receive array. ### Competing Interest Statement The authors have declared no competing interest. * AWG : American Wire Gauge BW : Bandwidth CH : Channel CNR : Contrast to Noise Ratio CT : Computed Tomography dMRI : Diffusion MRI EPI : Echo Planar Imaging fMRI : Functional MRI FOV : Field of View IM : Intramuscular iPAT : Integrated Parallel Acquisition Techniques NHP : Non-Human Primate PCB : Printed Circuit Board PETG : Polyethylene Terephthalate Glycol-modified PTFE : Polytetrafluoroethylene R : Reduction factor RF : Radio Frequency SE : Spin Echo SMD : Surface Mount Device SNR : Signal to Noise Ratio T : Tesla T1w : T1 weighted T2w : T2 weighted UHF : Ultra High Field [1]: #ref-2

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