SYSTEM AND METHOD FOR FACILITATING REFLECTOMETRIC DETECTION OF PHYSIOLOGIC ACTIVITY
First Claim
1. A method for remotely sensing cardiac-related data of an animal subject, the method comprising:
- transmitting a radio frequency signal to impinge on tissue of the subject;
receiving a reflected radio frequency signal, the reflected radio frequency signal comprising a reflection of the radio frequency signal impinged on tissue of the subject;
generating baseband data utilizing the reflected radio frequency signal;
filtering data embodying or derived from the baseband data to yield initially filtered data, wherein said filtering includes high pass filtering with a cutoff frequency in a range of 10 Hz or greater to yield initially filtered data;
performing waveform phase position determination on data embodying or derived from the initially filtered data to yield waveform phase position determined data;
performing at least one auto-correlation of the waveform phase position determined data to yield auto-correlated data;
determining periodicity of data embodying or derived from the auto-correlated data; and
computing heart rate using a maximum peak of the periodicity.
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Abstract
A method for remotely sensing cardiac-related data of an animal subject includes transmitting a RF signal to impinge on tissue of the subject, receiving a reflected portion of the RF signal, generating baseband data, filtering baseband data (e.g., including high pass filtering), performing waveform phase position determination, performing at least one auto-correlation of the waveform phase position determined data, determining periodicity of the auto-correlated data, and (i) computing heart rate using a maximum periodicity of the periodicity, or (ii) identifying abnormalities in cardiac function, such as may be indicated by temporal variations in heart rate and/or signal amplitude corresponding to cardiac activity. Multiple bandpass filtering schemes may be employed.
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Citations
33 Claims
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1. A method for remotely sensing cardiac-related data of an animal subject, the method comprising:
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transmitting a radio frequency signal to impinge on tissue of the subject; receiving a reflected radio frequency signal, the reflected radio frequency signal comprising a reflection of the radio frequency signal impinged on tissue of the subject; generating baseband data utilizing the reflected radio frequency signal; filtering data embodying or derived from the baseband data to yield initially filtered data, wherein said filtering includes high pass filtering with a cutoff frequency in a range of 10 Hz or greater to yield initially filtered data; performing waveform phase position determination on data embodying or derived from the initially filtered data to yield waveform phase position determined data; performing at least one auto-correlation of the waveform phase position determined data to yield auto-correlated data; determining periodicity of data embodying or derived from the auto-correlated data; and computing heart rate using a maximum peak of the periodicity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for remotely sensing cardiac-related data of an animal subject, the system comprising:
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a radio frequency transmitter adapted to transmit a radio frequency signal for impingement on tissue of the subject; a radio frequency receiver adapted to receive a radio frequency signal comprising a reflection of the radio frequency signal impinged on tissue of the subject; a baseband data generating element arranged to generate baseband data from the received radio frequency signal; at least one filtering element arranged to filter data embodying or derived from the baseband data to yield initially filtered data, wherein said filtering includes high pass filtering with a cutoff frequency in a range of 10 Hz or greater to yield initially filtered data; a waveform phase position determining element arranged to perform waveform phase position determination on data embodying or derived from the initially filtered data to yield waveform phase position determined data; an auto-correlation element arranged to perform at least one auto-correlation of the waveform phase position determined data to yield auto-correlated data; a periodicity determining element arranged to determine periodicity of data embodying or derived from the auto-correlated data; and a heart rate computing element arranged to compute heart rate using a maximum peak of the periodicity. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A method for remotely sensing cardiac-related data of an animal subject, the method comprising:
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transmitting a radio frequency signal to impinge on tissue of the subject; receiving a reflected radio frequency signal, the reflected radio frequency signal comprising a reflection of the radio frequency signal impinged on tissue of the subject; generating baseband data utilizing the reflected radio frequency signal; filtering data embodying or derived from the baseband data to yield a plurality of sets of initially filtered data, wherein each set of initially filtered data is obtained by filtering including high pass filtering with a different filtering scheme; performing waveform phase position determination on data embodying or derived from the plurality of sets of initially filtered data to yield a plurality of sets of waveform phase position determined data; performing at least one auto-correlation of each set of the plurality of sets of the waveform phase position determined data to yield a plurality of sets of auto-correlated data; determining periodicity of at least one set of data embodying or derived from the plurality of sets of auto-correlated data; and computing heart rate from the periodicity. - View Dependent Claims (25, 26)
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27. A method comprising:
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transmitting a radio frequency signal to impinge on tissue of an animal subject; receiving a reflected radio frequency signal, the reflected radio frequency signal comprising a reflection of the radio frequency signal impinged on tissue of the subject; generating baseband data utilizing the reflected radio frequency signal; filtering data embodying or derived from the baseband data to yield initially filtered data, wherein said filtering includes high pass filtering with a cutoff frequency of 10 Hz or greater to yield initially filtered data; performing waveform phase position determination on data embodying or derived from the initially filtered data to yield waveform phase position determined data; determining periodicity of data embodying or derived from the waveform phase position determined data, wherein the periodicity is indicative of cardiac activity; and comparing periodicity indicative of cardiac activity for a selected interval to (i) periodicity indicative of cardiac activity for an interval preceding the selected interval and (ii) periodicity indicative of cardiac activity for an interval following the selected interval. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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Specification