QRS filter for NMR imaging apparatus and NMR imaging employing such filter
A pair of Butterworth 4th order filters (42,44) are cascaded with an absolute value filter (46) to filter the QRS wave of an EXG signal generated in a magnetic field of an NMR imaging system. The -3 dB point of the high pass filter is at about 10 Hertz to filter the T-wave and Bo field induced breat...
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| Format: | Patent |
| Sprache: | eng ; fre ; ger |
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| Zusammenfassung: | A pair of Butterworth 4th order filters (42,44) are cascaded with an absolute value filter (46) to filter the QRS wave of an EXG signal generated in a magnetic field of an NMR imaging system. The -3 dB point of the high pass filter is at about 10 Hertz to filter the T-wave and Bo field induced breathing artifacts and the -3 dB point of the low pass filter is about 20 Hertz to filter the high frequency components of pulsed static field gradient noise created by the NMR system. |
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