Method and system to identify motion artifacts and improve reliability of measurements and alarms in photoplethysmographic measurements
First Claim
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1. A system for identifying motion artifacts, said system comprising:
- a probe configured to sense a physiological parameter of an associated patient, the probe configured to be positioned on or proximate to the associated patient, the probe being configured to generate one or more physiological signals indicative of the sensed physiological parameter;
an accelerometer configured to be positioned on, proximate to, or integrated with the probe, the accelerometer configured to generate one or more acceleration signals measuring acceleration;
a first signal processing unit configured to process the one or more physiological signals from the probe to determine measurements of the physiological parameter;
a second signal processing unit configured to process one or more acceleration signals from the accelerometer to determine motion characteristics, the processing of the second signal processing unit being performed in parallel, and independent of, the processing of the first signal processing unit; and
a labeling unit configured to label measurement of the physiological parameter with temporally corresponding motion characteristics based on the determined motion characteristics; and
a signal quality index (SQI) threshold unit configured to discard or down weight measurements of the physiological parameter with signal quality indices (SQI)s below a SQI threshold and passing a remaining or down weighted measurements of the physiological parameter to the labeling unit; and
wherein the SQI threshold unit is configured to determine the SQI threshold by;
determining whether there is motion based on the measured acceleration;
in response to determining there is no motion, setting the SQI threshold to a predetermined value;
in response to determining there is motion, determining whether the motion is correlated with a measured motion artifact of the one or more physiological signals that is generated by, and received from, the probe;
in response to determining the motion is correlated, setting the SQI threshold to a first value using a correlated lookup function of a motion strength value; and
in response to determining the motion is uncorrelated, setting the SQI threshold to a second value using an uncorrelated lookup function of the motion strength value.
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Abstract
A system (10) and method to identify motion artifacts. Measurements of a physiological parameter of an associated patient are received from a probe (12) positioned on or proximate to the associated patient. Further, measurements of acceleration are received from an accelerometer (26) positioned on, proximate to, or integrated with the probe (12). Measurements of the physiological parameter are labeled based on the measured acceleration, such as being with or without motion.
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Citations
17 Claims
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1. A system for identifying motion artifacts, said system comprising:
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a probe configured to sense a physiological parameter of an associated patient, the probe configured to be positioned on or proximate to the associated patient, the probe being configured to generate one or more physiological signals indicative of the sensed physiological parameter; an accelerometer configured to be positioned on, proximate to, or integrated with the probe, the accelerometer configured to generate one or more acceleration signals measuring acceleration; a first signal processing unit configured to process the one or more physiological signals from the probe to determine measurements of the physiological parameter; a second signal processing unit configured to process one or more acceleration signals from the accelerometer to determine motion characteristics, the processing of the second signal processing unit being performed in parallel, and independent of, the processing of the first signal processing unit; and a labeling unit configured to label measurement of the physiological parameter with temporally corresponding motion characteristics based on the determined motion characteristics; and a signal quality index (SQI) threshold unit configured to discard or down weight measurements of the physiological parameter with signal quality indices (SQI)s below a SQI threshold and passing a remaining or down weighted measurements of the physiological parameter to the labeling unit; and
wherein the SQI threshold unit is configured to determine the SQI threshold by;determining whether there is motion based on the measured acceleration; in response to determining there is no motion, setting the SQI threshold to a predetermined value; in response to determining there is motion, determining whether the motion is correlated with a measured motion artifact of the one or more physiological signals that is generated by, and received from, the probe; in response to determining the motion is correlated, setting the SQI threshold to a first value using a correlated lookup function of a motion strength value; and in response to determining the motion is uncorrelated, setting the SQI threshold to a second value using an uncorrelated lookup function of the motion strength value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for identifying motion artifacts, said method comprising:
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receiving, by at least one processor, one or more physiological signals of a sensed physiological parameter of an associated patient from a probe configured to be positioned on or proximate to the associated patient; receiving, by the at least one processor, one or more acceleration signals measuring acceleration from an accelerometer positioned on, proximate to, or integrated with the probe; processing the one or more physiological signals received from the probe to determine measurements of the physiological parameter; processing the one or more signals from the accelerometer to determine motion characteristics, the processing of the one or more physiological signals being performed in parallel, and independent of, the processing of the one or more acceleration signals; labeling, by the at least one processor, measurements of the physiological parameter with temporally corresponding motion characteristics based on the determined motion characteristics; and generating, with the at least one processor, a signal quality index (SQI) of the measured physiological parameter by operations including determining whether there is motion based on the measured acceleration; in response to determining there is no motion, setting (SQI) threshold to a predetermined value; in response to determining there is motion, determining whether the motion is correlated with a measured motion artifact of the one or more physiological signals that is generated by, and received from, the probe; in response to determining the motion is correlated, setting the SQI threshold to a first value using a correlated lookup function of a motion strength value; and
,in response to determining the motion is uncorrelated, setting the SQI threshold to a second value using an uncorrelated lookup function of the motion strength value. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A system for identifying motion artifacts, said system comprising:
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at least one processor programmed to; receive measurements of a physiological parameter of an associated patient from an associated probe configured to be positioned on or proximate to the associated patient; receive measurements of acceleration from an associated accelerometer positioned on, proximate to, or integrated with the probe; label measurements of the physiological parameter as being with or without motion based on a measured acceleration threshold; and discard or down weight measurements of the physiological parameter with signal quality indices (SQI)s below a SQI threshold, the at least one processor being programmed to determine the signal quality index threshold by; determining whether there is motion based on the measured acceleration; in response to determining there is no motion, setting the SQI threshold to a predetermined value; in response to determining there is motion, determining whether the motion is correlated with a measured motion artifact of the one or more physiological signals that is generated by, and received from, the probe; in response to determining the motion is correlated, setting the SQI threshold to a first value using a correlated lookup function of a motion strength value; and in response to determining the motion is uncorrelated, setting the SQI threshold to a second value using an uncorrelated lookup function of the motion strength value. - View Dependent Claims (17)
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Specification