KEYWORDS: Microwave radiation, Magnetic resonance imaging, Tissues, Absorption, Magnetism, Scanners, Computer programming, Magnetoencephalography, Waveguides, Signal to noise ratio
We have used phase contrast magnetic resonance gradients to image small displacements induced by a pulsed 434
MHz microwave field. Thermoelastic expansions, which are related to the tissues' local microwave absorption
properties and the applied microwave field distribution are encoded into the phase of MR images. The imaging
principles are applicable to other irradiation sources. Initial efforts to develop the signal generation and control
necessary for synchronous pulsed microwave power deposition and MR image acquisition have been successful.
Preliminary results suggest that MR phase accumulation associated with microwave power deposition in a
localized absorber has been observed.
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