| 摘要 |
A circuit for stabilizing the electromagnet coil current of a magnetic resonant imaging device is provided which comprises a variable DC power supply coupled to provide current through the series combination of the primary winding of a DC current transformer, the electromagnet coil of the magnetic resonance imaging device, and a sense resistor. Changes in voltage across the sense resistor are monitored to provide rapid reaction to changes in the electromagnet coil current and the output of the DC current transformer is monitored to detect the absolute value of the electromagnet coil current. These two monitored signals are used to control the DC power supply in a manner which stabilizes the resultant electromagnet coil current.
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