Method and apparatus for synchronously detecting a magnetocardiogram and method and apparatus for synchronously adding magnetocardiograms
AssigneesAgency of Industrial Science and Technology, Daikin Industries, Ltd.
InventorsHisashi Kado, Tomoaki Ueda
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Abstract
Cross-correlation values representative of cross-correlation of an electrocardiogram pulse with a rectangular pulse window which consists of a negative rectangular pulse, a positive rectangular pulse and a negative rectangular pulse are obtained. An R-wave of the electrocardiogram is detected by a peak of the cross-correlation values is detected. Then a magnetocardiogram in synchronism with the R-wave of the electrocardiogram is detected. Magnetocardiograms corresponding to individual cycles of a magnetocardiogram can be added as required.
Claims8
A method for synchronously detecting a magnetocardiogram comprising the steps of:
- receiving an electrocardiogram signal;
- receiving a magnetocardiogram signal;
- determining a rectangular pulse window signal which consists of a negative rectangular pulse wave, a positive rectangular pulse wave and a negative rectangular pulse wave, in this order;
- cross-correlating the electrocardiogram signal with the rectangular pulse window signal to obtain a cross-correlation values signal;
- detecting Q-R-S groups of the electrocardiogram signal based on the obtained cross-correlation values signal;
- and
- detecting a portion of the magnetocardiogram signal which is in synchronism with the detected Q-R-S groups.
A method for synchronously adding magnetocardiograms comprising the steps of:
- receiving a electrocardiogram signal;
- receiving magnetocardiogram signals;
- determining a rectangular pulse window signal which consists of a negative rectangular pulse, a positive rectangular pulse and a negative rectangular pulse, in this order;
- cross-correlating the electrocardiogram signal with the rectangular pulse window signal to obtain a cross-correlation values signal;
- detecting Q-R-S groups of the electrocardiogram based on the obtained cross-correlation values signal;
- and
- adding magnetocardiogram cycle portions which are in synchronism with the detected Q-R-S groups.
An apparatus for synchronously detecting a magnetocardiogram comprising:
- means for receiving an electrocardiogram signal;
- means for determining a rectangular pulse window signal which consists of a negative rectangular pulse wave, a positive rectangular pulse wave and a negative rectangular pulse wave, in this order;
- cross-correlation means for cross-correlating a received electrocardiogram signal with a determined rectangular pulse wave signal to obtain a cross-correlation values signal;
- R-wave detection means for detecting R-waves of a received electrocardiogram signal based on an obtained cross-correlation values signal;
- and
- magnetocardiogram detection means for detecting a magnetocardiogram signal in synchronism with detecting R-waves.
An apparatus for synchronously adding magnetocardiograms comprising:
- means for receiving an electrocardiogram signal;
- means for receiving magnetocardiogram signals;
- means for determining a rectangular pulse window signal which consists of a negative rectangular pulse wave, a positive rectangular pulse wave and a negative rectangular pulse wave in this order;
- cross-correlation means for cross-correlating a received electrocardiogram signal with a determined rectangular pulse wave signal to obtain a cross-correlation values signal;
- R-wave detection means for detecting R-waves of a received electrocardiogram signal based on an obtained cross-correlation values signal;
- and
- addition means for adding received magnetocardiogram signals corresponding to individual cycles of a magnetocardiogram signal in synchronism with detected R-waves.
Dependencies are inferred from the claim text.