Quantitative seismocardiography
AssigneeAcarix A/S
InventorsSamuel Emil SCHMIDT, Peter SØGAARD, Johannes Jan STRUIJK
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Abstract
A quantifying of the function of a beating heart is disclosed, in which a signal is recorded with an accelerometer placed on the chest of a person. A plurality of segments of the signal are formed, which are aligned and filtered with a band-pass filter having a lower cutoff frequency below 1 Hz and an upper cut-off frequency in the range 100-250 Hz. A mean segment is then determined, in which a first temporal feature is determined. A measure is then determined based on at least one of the signal value, or amplitude, of the first temporal feature and the location in time of the first temporal feature. The determined measure is then provided as output information.
Claims16
A method for quantifying heart failure, wherein the method comprises:
- obtaining a plurality of segments of a signal recorded with an accelerometer placed on the chest of a person for measuring accelerations and vibrations of the chest wall of the person caused by myocardial movement, wherein each segment covers a cardiac cycle,
- aligning the plurality of segments, filtering the plurality of segments with a band-pass filter having a lower cutoff frequency below 1 Hz and an upper cut-off frequency in the range 100-250 Hz, and determining a mean segment based on the plurality of segments,
- determining a first temporal feature in the mean segment,
- determining a measure based on at least one of the signal value, or amplitude, of the first temporal feature and the location in time of the first temporal feature, and
- providing output information based on the determined measure.
A system for quantifying heart failure, wherein the system comprises:
- (A) an accelerometer configured to be placed on the chest of a person for measuring accelerations and vibrations of the chest wall of the person caused by myocardial movement,
- (B) a processor operatively connected to the accelerometer and configured to:
- obtain a plurality of segments of a signal recorded with the accelerometer,
- align the plurality of segments, filter the plurality of segments with a band-pass filter having a lower cutoff frequency below 1 Hz and an upper cut-off frequency in the range 100-250 Hz, and determine a mean segment based on the plurality of segments,
- determine a first temporal feature in the mean segment,
- determine a measure based on at least one of the signal value, or amplitude, of the first temporal feature and the location in time of the first temporal feature, and
- provide output information based on the determined measure.
A computer program product for being used in a system for quantifying heart failure comprising:
- (A) an accelerometer for being placed on the chest of a person for measuring accelerations and vibrations of the chest wall of the person caused by myocardial movement, and (B) a processor operatively connected with the accelerometer, the computer program product comprising program code instructions configured to, when executed by the processor of the system, cause the processor to:
- obtain a signal with the accelerometer and form a plurality of segments from the signal, wherein each segment covers, or corresponds to, a cardiac cycle.
- record a plurality of segments of a signal with the accelerometer,
- align the plurality of segments, filter the plurality of segments with a band-pass filter having a lower cutoff frequency below 1 Hz and an upper cut-off frequency in the range 100-250 Hz, and determine a mean segment based on the plurality of segments,
- determine a first temporal feature in the mean segment,
- determine a measure based on at least one of the signal value, or amplitude, of the first temporal feature and the location in time of the first temporal feature, and
- provide output information based on the determined measure.
Dependencies are inferred from the claim text.