REDUCTION OF MRI INTERFERENCE FROM THE ELECTROCARDIOGRAM USING LEAD INFORMATION

摘要

A circuit (32) for use in an magnetic resonance (MR) system to reduce MR interference of a physiological signal S(f) includes a first summing/subtraction node (36), a high pass filter (40), and a second summing/subtraction node (42). The first summing/subtraction node (36)inputs a first signal (34) including radio frequency magnetic interference N(f) and a physiological signal S(f), and a second signal (38) including the physiological signal S(f) and an error signal E(f), and subtractively combines the second signal with the first signal to generate a difference signal N(f)−E(f). The high pass filter (40) filters the difference signal N(f)−E(f) from the first summing/subtraction node. The second summing/subtraction node (42) subtractively combines the first signal S(f)+N(f) (34) and the filtered signal H(f)*[N(f)−E(f)] from the high pass filter, and generates the second signal S(f)+E(f) (38).

主权项

1. A circuit for use in an magnetic resonance (MR) system to reduce MR interference of a physiological signal S(f), the circuit comprising:
a first summing/subtraction node which inputs a first signal including all interference components generated by the MRI scanner N(f) and a physiological signal S(f), and a second signal including the physiological signal S(f) and an error signal E(f), and which subtractively combines the second signal S(f)+E(f) with the first signal S(f)+N(f) to generate a difference signal N(f)−E(f); a high pass filter which filters the difference signal N(f)−E(f) from the first surriminesulatraction node; and a second summing ubtraction node which subtractively combines the first signal S(f)+N(f) and the filtered signal H(f) [N(f)−E(f)] from the high pass filter, and generates the second signal S(f)+E(f).