Method for monitoring an RF power amplifier, and an RF...

Details Method for monitoring an RF power amplifier, and an RF... Method for monitoring an RF power amplifier, and an RF...

2005-02-10

2008-03-04

Trinh, Sonny (Department: 2618)

Telecommunications

Transmitter

Measuring, testing, or monitoring of transmitter

C455S067110, C455S114300

Reexamination Certificate

active

07340225

ABSTRACT:
In a method for monitoring of a radio frequency power amplifier and a radio frequency device, a radio frequency monitoring device and magnetic resonance tomography system operable according to the method, radio frequency pulses emitted by a radio frequency power amplifier and are transmitted into a human subject by a transmission coil at temporal intervals. Measurement values that represent the power of the radio frequency pulses are measured at temporal intervals, and varying, predetermined power limit values are determined at temporal intervals. A control value representing the radio frequency dose emitted in a time window is determined based on a number of measurement values measured in the time window. Likewise, a limit control value representing a dose limit value allowed in the appertaining time window is determined based on the power limit values determined in the appertaining time window. The radio frequency power amplifier is limited in operation if and when the control value reaches or exceeds the limit control value.

REFERENCES:
patent: 6426623 (2002-07-01), Bernstein
patent: 6683453 (2004-01-01), Heid
patent: 6841997 (2005-01-01), Feiweier
patent: 6891373 (2005-05-01), Deimling
patent: 7254435 (2007-08-01), Zhang et al.
patent: 2005/0165295 (2005-07-01), Li et al.
patent: 2005/0260955 (2005-11-01), Bielmeier et al.

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