Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1993-07-06
1995-10-10
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, G01R 3320
Patent
active
054573874
ABSTRACT:
A primary gradient coil assembly (22) is mounted in the inner bore or cylinder (20) of a vacuum dewar (18) that surrounds a superconducting magnet assembly (10). A pair of end ring assemblies, such as electrically conductive lapped segment loops (38) are supported by the gradient coil assembly (22). The end ring segments are capacitively coupled. A plurality of removable radio frequency coil element assemblies (40) are selectively attached to and detached from the gradient coil assembly. Each of the removable RF coil element assembly includes a dielectric housing (50), a longitudinally extending conductor element (52), an electrical connector (44), and circuit components (54) which connects the longitudinal conductor element with the electrical connector. The connector is electrically connected, at radio frequencies, with the ring assembly (38). A mechanical interlock (60) mechanically locks and selectively releases the removable element assemblies (40) to the gradient coil assembly. Sets of different removable element assemblies are provided with different effective radii, i.e. different physical displacements of the electrical conductor elements (52) from the gradient coil assembly, different resonance frequencies, i.e. different reactive elements (58), and the like to adapt the different removable element assemblies for different imaging applications. The removable element assemblies may be completely removed when specialty RF coils, such as a head coil, biplanar gradient coil, or surface coil are used.
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"Quadrature-Headcoil and Helmholtz-Type Neckcoil--An Optimized RF-Antenna-Pair for Imaging Head, Neck and C-Spine and 1.0 and 1.5 T", Krause, et al. SMRM 7th Meeting, vol. 2, 1988, p. 845.
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Mastandrea Nicholas J.
Orlando Paul T.
Patrick John L.
Zou Xueming
Mah Raymond Y.
O'Shea Sandra L.
Picker International Inc.
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