Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Reexamination Certificate
2005-05-31
2005-05-31
Arana, Louis (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
C324S322000
Reexamination Certificate
active
06900636
ABSTRACT:
The invention relates to an arrangement for generating RF fields in the examination volume (100) of an MR apparatus. A plurality of resonator segments are arranged around the examination volume (100) within the gradient tube (103), said resonator segments being connected together so as to form a body coil. Each resonator segment is provided with a conductor element (104) which is constructed as a planar strip and extends parallel to the longitudinal axis of the main field magnet. The resonator segments are electromagnetically decoupled from one another by means of intermediate capacitances, so that a separate transmission channel (1to8) can be associated with each resonator segment, the RF feeding into the relevant resonator segment taking place via said channel. Because the phase and the amplitude of the RF feeding can be individually selected for each resonator segment, the arrangement in accordance with the invention enables substantially complete control of the RF field distribution in the examination volume (RF shimming).
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C. Leussler, et al.; The Bandpass Birdcage Resonator Modified as a Coil Array for Simultaneous MR Acquisition; Proceedings of the ISMRM, No. 176, Vancouver, 1997.
Duerr, W., et al.; A Dual-Frequency Circularly Polatizing Whole-Body MR Antenna for 69/170 MHZ; MR in Medicine, Academic Press, vol. 19, pp. 446-455.
Arana Louis
Koninklijke Philips Electronics , N.V.
Lundin Thomas M.
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