PHYSIOLOGICAL EVENT DETECTION SYSTEMS AND METHODS
First Claim
1. A device readable medium, comprising instructions that when performed by the device, cause the device to perform acts comprising:
- obtaining a first physiological parameter;
obtaining a second physiological parameter;
forming a distribution of values of the first physiological parameter using the first and second physiological parameters;
receiving a specified false alarm rate;
computing an event detection threshold based on the specified false alarm rate and the distribution of values of the first physiological parameter, the event detection threshold changing according to a change in the distribution of values;
obtaining a measurement of the first physiological parameter;
comparing the measurement of the first physiological parameter to the event detection threshold; and
declaring whether the measurement is representative of a detected event using the comparison.
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Abstract
Systems and methods using constant false alarm rate techniques for event detection. One example of an event detection method includes collecting a first distribution of measurements for a first physiological parameter. In another example, the first distribution of measurements includes only non-event measurements. One or more values are determined corresponding to at least a first tail area of the first distribution from at least one measurement of the first physiological parameter toward an end point of the distribution. A threshold is established based on a specified false alarm rate. The one or more values are compared to the threshold. The method includes determining if the measurement is representative of a detected event using the comparison.
105 Citations
20 Claims
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1. A device readable medium, comprising instructions that when performed by the device, cause the device to perform acts comprising:
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obtaining a first physiological parameter; obtaining a second physiological parameter; forming a distribution of values of the first physiological parameter using the first and second physiological parameters; receiving a specified false alarm rate; computing an event detection threshold based on the specified false alarm rate and the distribution of values of the first physiological parameter, the event detection threshold changing according to a change in the distribution of values; obtaining a measurement of the first physiological parameter; comparing the measurement of the first physiological parameter to the event detection threshold; and declaring whether the measurement is representative of a detected event using the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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screening a first distribution of values for a first physiological parameter according to a second physiological parameter; excluding one or more values from the first distribution of values where the one or more values are associated with the second physiological parameter; establishing an event detection threshold based on a specified false alarm rate and the first distribution of values without the excluded values, the event detection threshold changing according to changes in the first distribution of values; obtaining a measurement of the first physiological parameter; comparing the measurement to the event detection threshold; and determining whether the measurement is representative of a detected event using the comparison. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An apparatus comprising:
a processor circuit comprising; a distribution forming circuit configured to form a distribution of measurements of a first physiological parameter screened with a second physiological parameter, a comparator configured to compare a measurement of the first physiological parameter with a threshold, the threshold based on a specified false alarm rate and the distribution of measurements, the threshold changing according to changes in the distribution of measurements, and an event indicator configured to provide an event indication if the measurement is representative of a detected event using the comparison. - View Dependent Claims (16, 17, 18, 19, 20)
Specification