Radio frequency coil with two parallel end conductors

Details Radio frequency coil with two parallel end conductors Radio frequency coil with two parallel end conductors

2006-01-03

2006-01-03

Arana, Louis (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

C600S421000

Reexamination Certificate

active

06982553

ABSTRACT:
A radio-frequency coil (RF-coil) (19) for use in a magnetic-resonance imaging apparatus comprises a number of parallel bar-shaped electric conductors (37) arranged at regular intervals on an imaginary cylinder (39) and surrounded by a radio-frequency shield (RF-shield) (49). The bar-shaped conductors surround a measuring volume (11) and are interconnected at least at one of their end portions (41, 45) by an electric end conductor (43, 47) extending in a plane transverse to the bar-shaped conductors. A further electric end conductor (51, 53) is arranged near and parallel to the end conductor (43, 47), and is electrically connected to the RF-shield (49), preferably by a flange-shaped electric conductor (55, 57). The end conductor (43, 47) and the further end conductor (51, 53) together form a transmission line. An unwanted electromagnetic field (b1) generated by current in the end conductor (43, 47) is compensated for by an electromagnetic field (b2) generated by the current in the further end conductor (51, 53). Thus, the electromagnetic field of the end conductor (43, 47) does not lead to unwanted dissipation effects and temperature increases in the body of a patient present in the measuring volume (11).

REFERENCES:
patent: 4737718 (1988-04-01), Kemner et al.
patent: 4820985 (1989-04-01), Eash
patent: 5474069 (1995-12-01), Wong et al.
patent: 5999000 (1999-12-01), Srinivasan
patent: 6781378 (2004-08-01), Eberler et al.

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