Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1994-09-19
1997-02-11
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, 1286535, G01R 3328
Patent
active
056024789
ABSTRACT:
In a magnetic resonance apparatus including a transducer (25, 31 ) positioned in the examination region of the apparatus, the transducer is connected with equipment (49) outside the examination region by way of a lead (47) which is grounded (51, 53) to signals of the frequency of the RF field applied to a subject (5) in the examination region to excite magnetic resonance in the subject, at a distance along the lead from the transducer equal to a quarter wavelength at the RF field frequency (or an odd multiple thereof). Distortion of the RF field due to loading by the transducer is thereby reduced. The transducer may, for example, be a microphone or loudspeaker, e.g. incorporated in an intercom or active noise reduction arrangement, or a sensor for sensing a condition of a patient being examined.
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Gilderdale David J.
Salloway Anthony J.
GEC--Marconi Limited
Mah Raymond Y.
O'Shea Sandra L.
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