Nuclear magnetic resonance tomograph
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United States of America Patent
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Aug 11, 1992
Grant Date -
N/A
app pub date -
Jul 3, 1990
filing date -
Jul 13, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A nuclear magnetic resonance tomograph comprises a magnet surrounding a measuring space for receiving an object under test, e.g. a human body. A coil is provided for generating a high-frequency magnetic field within the measuring space. The coil is fed by a transmitter comprising a stage for adjusting the amplitude of a high-frequency current generated by the transmitter. A high-frequency magnetic field sensor is arranged at a predetermined calibration location outside the measuring space for measuring the high-frequency magnetic field strength prevailing at the predetermined calibration location. For calibrating the high-frequency magnetic field strength during a tomography measurement, the coil with the object under test inside is subjected to a test current and the resulting high-frequency magnetic field amplitude is sensed. From the value of the test current and the sensed high-frequency magnetic field strength one can calculate a measuring current to be fed into the coil for generating a desired high-frequency magnetic field strength within the measuring space.
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