Method of removing abnormal data and blood component spectroscopy analysis system employing the same
First Claim
1. A method of removing abnormal data in a blood component analysis system using spectroscopy to estimate a concentration of a blood component by analyzing a photo-plethysmographic (PPG) signal obtained by radiating light of first and second wavelengths reacting to the blood component on a subject and detecting light corresponding to the first and second wavelengths output from the subject, the method comprising:
- (a) collecting the PPG signal corresponding to the first and second wavelengths for a predetermined unit period of time, the collected PPG signal including “
n”
pulse data for each of the first and second wavelengths, the “
n”
pulse data representing a group of n pulses in the PPG signal corresponding to the first wavelength and a group of n pulses in the PPG signal corresponding to the second wavelength, n being a positive integer larger than 1;
(b) calculating a ratio between a maximum intensity value and a minimum intensity value for each pulse of the “
n”
pulse data for each of the first and second wavelengths, and obtaining “
n”
first ratio values corresponding to the n pulses of the first wavelength and “
n”
second ratio values corresponding to the n pulses of the second wavelength;
(c) calculating third ratio values between the “
n”
first ratio values and respective “
n”
second ratio values, the third ratio values defining “
n”
parameter values with respect to the “
n”
pulse data included in the collected PPG signal;
(d) calculating an average of the “
n”
parameter values;
(e) among the “
n”
parameters, determining a number “
m”
of parameter values whose deviations from the average calculated in (d) are greater than a predetermined standard deviation, wherein when the first and second wavelengths correspond to an isosbestic point, the predetermined standard deviation is set to ±
3.5% through ±
4.5%;
(f) comparing a ratio m/n with a predetermined removal reference value, and determining whether the “
n”
pulse data is valid; and
(g) replacing invalid “
n”
pulse data with new “
n”
pulse data, the new “
n”
pulse data being new pulse data in a newly collected PPG signal.
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Abstract
A method of removing abnormal data in a blood component analysis system using spectroscopy to estimate a concentration of a blood component by analyzing a photo-plethysmographic (PPG) signal obtained by radiating light of first and second wavelengths reacting to the blood component on a subject and detecting light corresponding to the first and second wavelengths output from the subject, includes collecting the PPG signal corresponding to the first and second wavelengths for a predetermined unit period of time, calculating “n” parameters, with respect to “n” pulse data included in the collected PPG signal, where n is a positive integer, calculating an average of the “n” parameters, and comparing a ratio of a number of parameters whose deviation from the average is greater than a predetermined standard deviation to the “n” parameters with a predetermined removal reference value to determine whether the “n” pulse data is valid.
13 Citations
16 Claims
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1. A method of removing abnormal data in a blood component analysis system using spectroscopy to estimate a concentration of a blood component by analyzing a photo-plethysmographic (PPG) signal obtained by radiating light of first and second wavelengths reacting to the blood component on a subject and detecting light corresponding to the first and second wavelengths output from the subject, the method comprising:
-
(a) collecting the PPG signal corresponding to the first and second wavelengths for a predetermined unit period of time, the collected PPG signal including “
n”
pulse data for each of the first and second wavelengths, the “
n”
pulse data representing a group of n pulses in the PPG signal corresponding to the first wavelength and a group of n pulses in the PPG signal corresponding to the second wavelength, n being a positive integer larger than 1;(b) calculating a ratio between a maximum intensity value and a minimum intensity value for each pulse of the “
n”
pulse data for each of the first and second wavelengths, and obtaining “
n”
first ratio values corresponding to the n pulses of the first wavelength and “
n”
second ratio values corresponding to the n pulses of the second wavelength;(c) calculating third ratio values between the “
n”
first ratio values and respective “
n”
second ratio values, the third ratio values defining “
n”
parameter values with respect to the “
n”
pulse data included in the collected PPG signal;(d) calculating an average of the “
n”
parameter values;(e) among the “
n”
parameters, determining a number “
m”
of parameter values whose deviations from the average calculated in (d) are greater than a predetermined standard deviation, wherein when the first and second wavelengths correspond to an isosbestic point, the predetermined standard deviation is set to ±
3.5% through ±
4.5%;(f) comparing a ratio m/n with a predetermined removal reference value, and determining whether the “
n”
pulse data is valid; and(g) replacing invalid “
n”
pulse data with new “
n”
pulse data, the new “
n”
pulse data being new pulse data in a newly collected PPG signal. - View Dependent Claims (2, 3, 5, 6, 7)
-
-
4. The method as claimed in 1, wherein when the first and second wavelengths are in one of a red range and an infrared range, the standard deviation is set to ±
- 1.5% through ±
2.5%.
- 1.5% through ±
-
8. A tangible, non-transitory computer-readable recording medium in a blood component analysis system using spectroscopy to estimate a concentration of a blood component by analyzing a photo-plethysmographic (PPG) signal obtained by radiating light of first and second wavelengths reacting to the blood component on a subject and detecting light corresponding to the first and second wavelengths output from the subject, wherein execution of code stored in the tangible, non-transitory computer-readable recording medium by one or more processors of a computer system causes the one or more processors to carry out:
-
collecting the PPG signal corresponding to the first and second wavelengths for a predetermined unit period of time, the collected PPG signal including “
n”
pulse data for each of the first and second wavelengths, the “
n”
pulse data representing a group of n pulses in the PPG signal corresponding to the first wavelength and a group of n pulses in the PPG signal corresponding to the second wavelength, n being a positive integer larger than 1;calculating a ratio between a maximum intensity value and a minimum intensity value for each pulse of the “
n”
pulse data for each of the first and second wavelengths, and obtaining “
n”
first ratio values corresponding to the n pulses of the first wavelength and “
n”
second ratio values corresponding to the n pulses of the second wavelength;calculating third ratio values between “
n”
first ratio values and respective “
n”
second ratio values;calculating an average of “
n”
parameters, the “
n”
parameters being the third ratio values;among the “
n”
parameters, determining a number “
m”
of parameter values, deviations from the average are greater than a predetermined standard deviation, wherein when the first and second wavelengths correspond to an isosbestic point, the predetermined standard deviation is set to ±
3.5% through ±
4.5%;comparing a ratio m/n with a predetermined removal reference value to determine whether the “
n”
pulse data is valid; andreplacing invalid “
n”
pulse data with new “
n”
pulse data, the new “
n”
pulse data being new pulse data in a newly collected PPG signal. - View Dependent Claims (9, 10, 11)
-
-
12. An apparatus for removing abnormal data in a blood component analysis system using spectroscopy to estimate a concentration of a blood component by analyzing a photo-plethysmographic (PPG) signal obtained by radiating light of first and second wavelengths reacting to the blood component on a subject and detecting light corresponding to the first and second wavelengths output from the subject, the apparatus comprising:
a signal processor programmed to; extract the (PPG) signal corresponding to the first and second wavelengths reacting to a particular blood component from an electrical signal output in response to the detected light, the extracted PPG signal including “
n”
pulse data for each of the first and second wavelengths, the “
n”
pulse data representing a group of n pulses in the PPG signal corresponding to the first wavelength and a group of n pulses in the PPG signal corresponding to the second wavelength, n being a positive integer larger than 1,calculate a ratio between a maximum intensity value and a minimum intensity value for each pulse of the “
n”
pulse data of each of the first and second wavelengths, and obtain “
n”
first ratio values corresponding to the n pulses of the first wavelength and “
n”
second ratio values corresponding to the n pulses of the second wavelength,calculate third ratio values between the “
n”
first ratio values and respective “
n”
second ratio values, the third ratio values defining “
n”
parameter values with respect to the “
n”
pulse data included in the collected PPG signal,calculate an average of the “
n”
parameter values,among the “
n”
parameter values, to determine a number “
m”
of parameter values whose deviations from the average are greater than a predetermined standard deviation, wherein when the first and second wavelengths correspond to an isosbestic point, the predetermined standard deviation is set to ±
3.5% through ±
4.5%,compare m/n with a predetermined removal reference value to determine whether the “
n”
pulse data is valid, andreplace invalid “
n”
pulse data with new “
n”
pulse data, the new “
n”
pulse data being new pulse data in a newly collected PPG signal.- View Dependent Claims (13, 14, 15, 16)
Specification