Magnetic Resonance System with RF Power Measurement Check Using a Calibrated Test Pulse

摘要

A predetermined reference object is arranged in a scan volume of a magnetic resonance system. In the scope of adjustment measurements, the reference object is respectively exposed by a radiofrequency transmitter antenna to an adjustment pulse. Using at least one radiofrequency receiver antenna, a magnetic resonance signal excited by the respective adjustment pulse in the reference object is respectively recorded. An amplitude of a first test pulse is ascertained with the aid of the magnetic resonance signals recorded in the scope of the adjustment measurements. In the scope of a subsequent test measurement, the reference object is exposed to the first test pulse by the radiofrequency transmitter antenna. A first measurement signal dependent on the amplitude of the first test pulse is recorded during the exposure of the reference object to the first test pulse. Further measures are implemented based on the recorded first measurement signal.

主权项

1. A method for operating a magnetic resonance system, the method comprising:
arranging a predetermined reference object in a scan volume of the magnetic resonance system; exposing, in the scope of adjustment measurements, the predetermined reference object to an adjustment pulse, respectively, using a radiofrequency transmitter antenna of the magnetic resonance system; recording a magnetic resonance signal excited by the adjustment pulse in the predetermined reference object, respectively using at least one radiofrequency receiver antenna of the magnetic resonance system; determining an amplitude of a first test pulse with the magnetic resonance signals recorded in the scope of the adjustment measurements; exposing the reference object to the first test pulse using the radiofrequency transmitter antenna in the scope of a subsequent test measurement; recording a first measurement signal dependent on the amplitude of the first test pulse using a measuring apparatus during the exposure of the reference object to the first test pulse; and implementing further measures based on the recorded first measurement signal.