Planar‐pair local coils for high‐resolution magnetic resonance imaging, particularly of the temporomandibular joint
- 1 January 1986
- journal article
- research article
- Published by Wiley in Medical Physics
- Vol. 13 (1), 1-7
- https://doi.org/10.1118/1.595934
Abstract
The two-loop-one-gap loop-gap resonator (planar pair) has been investigated as a local receiving coil for high-resolution proton imaging at 1.5 T (63.8 MHz). Sensitivity contours were determined on the bench by measuring the voltage induced in the coil when it is placed on the surface of a tank containing 0.1-M NaCl, as a function of the coordinates and orientation of a radiating dipole inside the tank. Contours were obtained as a function of the diameter D of the two loops, and their separation d. For comparison, considerable data also were obtained for single-turn circular loops as a function of loop diameter. Coil quality factors, Q''s, are reported in free space and the saline tank as a function of geometric parameters. Contours also were obtained using phantoms in a whole-body imager. Planar-pair coils couple to slabs of approximately (2D + d) .times. D cross section, and are superior to circular coils for imaging anatomic structures that are somewhat elongated. A particularly important feature of planar-pair local coils is that they are intrinsically isolated from the whole-body coil of the imager, and no special passive or active circuits are required when the whole-body coil is used for excitation. Planar-pair local coils have been optimized for imaging of the temporomandibular joint, and an image is shown.Funding Information
- National Institutes of Health (RR01008)
This publication has 2 references indexed in Scilit:
- Improved MR imaging of the orbit at 1.5 T with surface coilsAmerican Journal of Roentgenology, 1985
- Surface Coil Magnetic Resonance ImagingJournal of Computer Assisted Tomography, 1984