Magnetic resonance system with power loss-optimized operation

Details Magnetic resonance system with power loss-optimized operation Magnetic resonance system with power loss-optimized operation

2008-12-11

2011-10-11

Vargas, Dixomara (Department: 2858)

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

Reexamination Certificate

active

08035378

ABSTRACT:
A magnetic resonance system has multiple individual transmission antennas each charged with a transmission current to emit an individual excitation field in an examination volume to excite magnetic resonances in a subject, producing a total excitation field as a superimposition of the individual excitation fields. A determination device provided with a spatial distribution of an absorption rate of the examination subject, determines a combination of amplitudes and phase positions for the transmission currents relative to one another such that a locally absorbed power at a first point of the examination subject relative to a locally absorbed power at a second point of the examination subject satisfies a relative condition. The determined combination of amplitudes and phase positions are communicated to a control device, which charges the transmission antennas with transmission currents having the communicated phase positions and amplitudes scaled with a uniform scaling factor for all transmission currents relative to the communicated amplitudes.

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