Reduction of RF field disturbance in magnetic resonance apparatus
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United States of America Patent
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Feb 11, 1997
Grant Date -
N/A
app pub date -
Sep 19, 1994
filing date -
Sep 21, 1993
priority date (Note) -
Expired
status (Latency Note)
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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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