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 the tissue of the subject;
generating baseband data utilizing the reflected radio frequency signal;
filtering multiple parallel streams of data embodying or derived from the baseband data to yield initially filtered data including a plurality of initially filtered data sets, wherein each initially filtered data set is obtained by filtering a stream of data of the multiple parallel streams of data with a different filtering scheme, and each filtering scheme includes high-pass filtering with a cutoff frequency of 10 Hz or greater;
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, wherein said determining of periodicity comprises determining a plurality of periodicity values; and
computing heart rate including selecting a majority or median of the plurality of periodicity values.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
21 Claims
-
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 the tissue of the subject; generating baseband data utilizing the reflected radio frequency signal; filtering multiple parallel streams of data embodying or derived from the baseband data to yield initially filtered data including a plurality of initially filtered data sets, wherein each initially filtered data set is obtained by filtering a stream of data of the multiple parallel streams of data with a different filtering scheme, and each filtering scheme includes high-pass filtering with a cutoff frequency of 10 Hz or greater; 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, wherein said determining of periodicity comprises determining a plurality of periodicity values; and computing heart rate including selecting a majority or median of the plurality of periodicity values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A system for remotely sensing cardiac-related data of an animal subject, the system comprising:
-
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 the tissue of the subject; a baseband data generating element configured to generate baseband data from the received radio frequency signal; at least one filtering element configured to filter multiple parallel streams of data embodying or derived from the baseband data to yield initially filtered data including a plurality of initially filtered data sets, wherein each initially filtered data set is obtained by filtering with a different filtering scheme, and each filtering scheme includes high-pass filtering with a cutoff frequency of 10 Hz or greater; a waveform phase position determining element configured 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 configured to perform at least one auto-correlation of the waveform phase position determined data to yield auto-correlated data; a periodicity determining element configured to determine periodicity of data embodying or derived from the auto-correlated data, wherein said determining of periodicity of data comprises determining a plurality of periodicity values; and a heart rate computing element configured to compute heart rate including selection of a majority or median of the plurality of periodicity values. - View Dependent Claims (16, 17, 18, 19, 20, 21)
-
Specification