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Calibrated uncoupling of tightly coupled concentric surface coils for in vivo NMR

✍ Scribed by M. Robin Bendall

Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
1007 KB
Volume
8
Category
Article
ISSN
0740-3194

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✦ Synopsis

Three known active methods of detuning rf coils have been tested by determining the efficiency of uncoupling two concentric transmit surface coils in a double-coil probe. In a comparison at 80 MHz, the method based on the use of lambda/4 cables was found to have advantages. These methods utilize the introduction of an additional resonance at the frequency of interest to completely detune a coil. By offsetting the detuning of the coil (by offsetting the additional resonance) a calibrated fraction of the rf field of the detuned coil can be added to or substracted from the rf field of the neighboring coil.

πŸ“œ SIMILAR VOLUMES

Elimination of coupling between cylindri
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Coupling between large transmit and surface-receive coils is eliminated using a lambda/4 cable, terminated with crossed diodes to ground, inserted between the receive coil and ground, and by using a cable of length a little less than lambda/2 inserted between the transmit match capacitance and the n

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