METHOD AND SYSTEM FOR DETECTION AND REJECTION OF MOTION/NOISE ARTIFACTS IN PHYSIOLOGICAL MEASUREMENTS
First Claim
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1. A method for detection and amelioration of the effects of motion/noise artifacts in physiological measurements, the method comprising the steps of:
- a) preprocessing a segment of a signal from a physiological measurement;
b) obtaining a value of at least one indicator of volatility for the preprocessed segment;
c) including the segment in analyses of physiological measurements, if comparison of the value of the at least one indicator of volatility with a predetermined threshold indicates noise/motion artifacts are not present;
d) selecting another segment of the signal from the physiological measurement and proceeding to step (a), if the value of the at least one indicator of volatility is less than a predetermined threshold and another segment is available;
e) performing a time-frequency spectrum analysis for the preprocessed segment, if comparison of the value of the at least one indicator of volatility with the predetermined threshold indicates noise/motion artifacts are present;
f) comparing a predetermined measure of the time-frequency spectrum analysis to a predetermined measure'"'"'s threshold;
g) including the segment in analyses of physiological measurements, if the predetermined measure is within limits determined by the predetermined measure'"'"'s threshold;
h) discarding the segment, if the predetermined measure is not within the limits determined by the predetermined measure'"'"'s threshold, andi) selecting another segment of the signal from the physiological measurement and proceeding to step (a), if another segment is available;
j) repeat steps a) through i), if another segment is available.
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Abstract
Methods and systems for quantitatively detecting the presence of artifacts in physiological measurement data and for determining usable data among those that have been designated to be corrupted with artifacts are presented.
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35 Claims
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1. A method for detection and amelioration of the effects of motion/noise artifacts in physiological measurements, the method comprising the steps of:
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a) preprocessing a segment of a signal from a physiological measurement; b) obtaining a value of at least one indicator of volatility for the preprocessed segment; c) including the segment in analyses of physiological measurements, if comparison of the value of the at least one indicator of volatility with a predetermined threshold indicates noise/motion artifacts are not present; d) selecting another segment of the signal from the physiological measurement and proceeding to step (a), if the value of the at least one indicator of volatility is less than a predetermined threshold and another segment is available; e) performing a time-frequency spectrum analysis for the preprocessed segment, if comparison of the value of the at least one indicator of volatility with the predetermined threshold indicates noise/motion artifacts are present; f) comparing a predetermined measure of the time-frequency spectrum analysis to a predetermined measure'"'"'s threshold; g) including the segment in analyses of physiological measurements, if the predetermined measure is within limits determined by the predetermined measure'"'"'s threshold; h) discarding the segment, if the predetermined measure is not within the limits determined by the predetermined measure'"'"'s threshold, and i) selecting another segment of the signal from the physiological measurement and proceeding to step (a), if another segment is available; j) repeat steps a) through i), if another segment is available. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 22)
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15. A system for detection and amelioration of the effects of motion/noise artifacts in physiological measurements, the system comprising:
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at least one processor; and computer usable media having computer readable code embodied therein, the computer readable code causing said at least one processor to; a) preprocess a segment of a signal from a physiological measurement; b) obtain a value of at least one indicator of volatility for the preprocessed segment; c) include the segment in analyses of physiological measurements, if comparison of the value of the at least one indicator of volatility with a predetermined threshold indicates noise/motion artifacts are not present; d) select another segment of the signal from the physiological measurement and proceeding to step (a), if the value of the at least one indicator of volatility is less than a predetermined threshold and another segment is available; e) perform a time-frequency spectrum analysis for the preprocessed segment, if comparison of the value of the at least one indicator of volatility with the predetermined threshold indicates noise/motion artifacts are present; f) compare a predetermined measure of the time-frequency spectrum analysis to a predetermined measure'"'"'s threshold; g) include the segment in analyses of physiological measurements, if the predetermined measure is within limits determined by the predetermined measure'"'"'s threshold; h) discard the segment, if the predetermined measure is not within the limits determined by the predetermined measure'"'"'s threshold, and i) select another segment of the signal from the physiological measurement and proceeding to step (a), if another segment is available; j) repeat steps a) to i), if another segment is available. - View Dependent Claims (16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28)
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29. A computer program product comprising:
a non-transitory computer usable medium having computer readable code embodied therein for detection and amelioration of the effects of motion/noise artifacts in physiological measurements, the computer readable code causing at least one processor to; a. preprocess a segment of a signal from a physiological measurement; b. obtain a value of at least one indicator of volatility for the preprocessed segment; c. include the segment in analyses of physiological measurements, if comparison of the value of the at least one indicator of volatility with a predetermined threshold indicates noise/motion artifacts are not present; d. select another segment of the signal from the physiological measurement and proceeding to step (a), if the value of the at least one indicator of volatility is less than a predetermined threshold and another segment is available; e. perform a time-frequency spectrum analysis for the preprocessed segment, if comparison of the value of the at least one indicator of volatility with the predetermined threshold indicates noise/motion artifacts are present; f. compare a predetermined measure of the time-frequency spectrum analysis to a predetermined measure'"'"'s threshold; g. include the segment in analyses of physiological measurements, if the predetermined measure is within limits determined by the predetermined measure'"'"'s threshold; h. discard the segment, if the predetermined measure is not within the limits determined by the predetermined measure'"'"'s threshold, and i. select another segment of the signal from the physiological measurement and proceeding to step (a), if another segment is available; j. repeat steps a) to i), if another segment is available. - View Dependent Claims (30, 31, 32, 33, 34, 35)
Specification