Magnetic resonance imaging system with a Class-E radio frequency amplifier
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United States of America Patent
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Jun 3, 2008
Grant Date -
Dec 6, 2007
app pub date -
Feb 23, 2007
filing date -
Feb 24, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A Class-E amplifier has been adapted for use in the radio frequency section of a magnetic resonance imaging (MRI) system. A drive signal is produced by modulating the envelope of a radio frequency carrier signal and then is applied to a switch in the Class-E amplifier. The switch is connected in series with a choke between a supply voltage terminal and circuit ground with an output node formed between the choke and the switch. The output node is coupled to circuit ground by a shunt capacitor. In a preferred embodiment, a pair of such amplifiers, that are .pi. radians out of phase, are connected to each rung of a transverse electromagnetic transmit array type radio frequency coil of the MRI system.
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