Patent ID: 8509883

Claim:
A method for issuing a trigger signal for a magnetic resonance device, comprising: measuring a reference ECG signal of a patient in an environment without being disturbed by an gradient field of the magnetic resonance device using an ECG measuring instrument; identifying an R wave in the reference ECG signal using a processing unit; determining a reference quantity from the reference ECG signal in a time interval starting before the R wave and lasting maximum up to an occurrence of the R wave using the processing unit; measuring an ECG signal of the patient in an environment being disturbed by the gradient field of the magnetic resonance device using the ECG measuring instrument; creating a first comparison rule from the reference quantity comprising an optimal filter and outputting a similarity value using the processing unit; comparing the measured ECG signal with the reference quantity based on the first comparison rule; creating a second comparison rule comprising determining a deviation of the reference quantity from the measured ECG signal multiplied by a factor using the processing unit, wherein the factor is dependent on the similarity value of the first comparison rule; comparing the measured ECG signal with the reference quantity based on the second comparison rule; and issuing the trigger signal for the magnetic resonance device if results of the comparison based on the first and the second comparison rules are positive.