An 8‐dipole transceive and 24‐loop receive array for non‐human primate head imaging at 10.5 T
| Autor: | Andrea Grant, Jan Zimmermann, Russell L. Lagore, Jerahmie Radder, Kamil Ugurbil, Gregor Adriany, Lance DelaBarre, Essa Yacoub, Steen Moeller, Noam Harel |
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| Rok vydání: | 2021 |
| Předmět: |
Signal-To-Noise Ratio
Article 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Optics Sampling (signal processing) Animals Radiology Nuclear Medicine and imaging Spectroscopy Physics business.industry Macaca mulatta Magnetic Resonance Imaging Loop (topology) Dipole Electromagnetic coil Molecular Medicine Female Transceiver business Head 030217 neurology & neurosurgery Diffusion MRI Tractography Radiofrequency coil |
| Zdroj: | NMR Biomed |
| ISSN: | 1099-1492 0952-3480 |
| DOI: | 10.1002/nbm.4472 |
| Popis: | A 32-channel radiofrequency 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) 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 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 signal-to-noise ratio in the lower half of the brain which was farthest from the close-fitting headcap receive array. |
| Databáze: | OpenAIRE |
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