Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1990-05-29
1991-12-24
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, G01R 3320
Patent
active
050756249
ABSTRACT:
A first circular ring of a given inductance is coupled to second and third circular rings by a plurality of equally spaced parallel rods to form a birdcage coil. The second and third rings have a combined inductance the same as that of the first ring and are located adjacent to each other at an end of the rods opposite the first ring. A tune-detune circuit is located at the end of and couples each of the rods to the second and third rings. This circuit includes parallel capacitances whose combined value is the same as the capacitance coupling the rods to the first ring to selectively tune the coil to a given radio-frequency. PIN diodes selectively rf couple the parallel capacitances respectively to the second and third rings. Direct current diode bias voltages are applied to the second and third rings which act as busses for the bias voltages. The second and third rings are split in half and capacitively coupled to permit applying relatively higher (DC) bias voltages to the diodes. The coil is divided into upper and lower halves with open space between the rods of the upper half to permit access to a patient's head and for patient comfort during examination.
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C. E. Hayes, W. A. Edelstein, J. F. Schneck, O. M. Mueller & M. Eash, "An Efficient, Highly Homogeneous Radiofrequency Coil for Whole-Body NMR Imaging at 1.5 T", Journal of Magnetic Resonance, vol. 63, 1985, pp. 622-628.
North American Philips Corporation
Squire William
Tokar Michael J.
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