WO2020228320A1 - 血压估计方法及装置 - Google Patents
血压估计方法及装置 Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
- A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
- A61B5/021—Measuring pressure in heart or blood vessels
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/21—Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation
- G06F18/211—Selection of the most significant subset of features
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/21—Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation
- G06F18/214—Generating training patterns; Bootstrap methods, e.g. bagging or boosting
Definitions
- the present invention relates to the field of medical technology, in particular to a blood pressure estimation method and device.
- blood pressure can reflect the physical health of the human body, and is also an important basis for evaluating the health of the heart and blood vessels. Therefore, timely attention to changes in blood pressure is related to people's health.
- the purpose of the present invention is to provide a blood pressure estimation method and device to solve the problem of low blood pressure estimation accuracy in view of the above-mentioned shortcomings in the prior art.
- an embodiment of the present invention provides a blood pressure estimation method, including: obtaining input parameters, where the input parameters include an encoded signal, a feature parameter, and multi-scale entropy;
- the encoded signal is a signal in which the first signal data is encoded by a self-encoder; the first signal data includes: a first electrocardiographic signal and a first pulse wave signal; the first electrocardiographic signal is a user ECG signal, the first pulse wave signal is the pulse wave signal of the user; the characteristic parameter is the physiological signal index of the first signal data; the multi-scale entropy characterizes the complexity of the first signal data degree;
- the input parameter is input into the blood pressure estimation model to obtain an estimated blood pressure; the estimated blood pressure has a corresponding relationship with the encoded signal, the characteristic parameter, and the multi-scale entropy respectively.
- said acquiring input parameters includes:
- the characteristic parameter is a physiological signal indicator of the sub-signal
- the acquiring the multi-scale entropy according to the second output signal data includes:
- the hyperparameter ⁇ is selected, and the second sequence is obtained through the second output signal data, and the second sequence satisfies the following formula:
- x(i) is the i-th vector in the second output signal data, 1 ⁇ i ⁇ n, 1 ⁇ j ⁇ n/ ⁇ , 1 ⁇ 20;
- z(i) [y(i),y(i+1),y(i+m-1)], 1 ⁇ i ⁇ n/ ⁇ -m+1;
- z(j) [y( j),y(j+1),y(j+m-1)], 1 ⁇ j ⁇ n/ ⁇ -m+1, i ⁇ j;
- h(i) [y(i),y(i+1),y(i+m-1),y(i+m)],
- h(j) [y(j),y(j+1),y(j+m-1),y(j+m)], 1 ⁇ j ⁇ n/ ⁇ -m+1;
- the multi-scale entropy According to the first average number B ( ⁇ ,m,r) and the second average number C ( ⁇ ,m,r) , the multi-scale entropy is obtained; the multi-scale entropy satisfies the following formula:
- E(m) represents multi-scale entropy.
- the characteristic parameters include any combination of one or more of the following: the time interval from the R peak of the electrocardiogram to the pulse wave valley point in the same cardiac cycle, and the ECG R peak to the maximum point of the pulse wave slope in the same cardiac cycle.
- the time interval of the ECG R peak to the pulse wave peak point in the same cardiac cycle heart rate, reflectivity, systolic duration, systolic-diastolic duration ratio, diastolic duration ratio, rise time, end-systolic volume, end-diastolic volume, relative contraction Final volume, systolic-diastolic volume ratio.
- the method further includes:
- the second signal data includes: a second ECG signal and a second pulse wave signal;
- the second ECG signal is the tester's ECG signal;
- the pulse wave signal is the test Personnel’s pulse wave signal;
- the first loss function represents the difference between the output parameter and the second signal data
- the second signal data is input to the autoencoder to obtain the output parameter, which can be obtained by the following formula:
- R represents the output parameter
- the first loss function is obtained, and the first loss function can be obtained by the following formula:
- L1 represents the first loss function
- the inputting the input parameters into the blood pressure estimation model, before obtaining the estimated blood pressure further includes:
- the blood pressure data being acquired at the same time as the second signal data, the blood pressure data including: systolic blood pressure sbp1 and diastolic blood pressure dbp1;
- the blood pressure data and the output parameters are input into the blood pressure estimation model to obtain an output blood pressure;
- the output blood pressure includes: output systolic blood pressure sbp2 and output diastolic blood pressure dbp2;
- the second loss function represents the difference between the output blood pressure and the blood pressure data; the second loss function satisfies the following formula:
- L2 ⁇ sbp1-sbp2 ⁇ 2 + ⁇ dbp1-dbp2 ⁇ 2 ;
- L2 represents the second loss function
- the present application also provides a blood pressure estimation device, including: an acquisition module and an estimation module;
- the acquisition module is configured to acquire input parameters, and the input parameters include an encoded signal, a characteristic parameter, and multi-scale entropy; wherein the encoded signal is a signal in which first signal data is encoded by a self-encoder; the first The signal data includes: a first ECG signal and a first pulse wave signal; the first ECG signal is the user's ECG signal, the first pulse wave signal is the user's pulse wave signal; the characteristic parameter Is the physiological signal indicator of the first signal data; the multi-scale entropy represents the complexity of the first signal data;
- the estimation module is configured to input the input parameter into a blood pressure estimation model to obtain an estimated blood pressure; the estimated blood pressure has a corresponding relationship with the encoded signal, the characteristic parameter, and the multi-scale entropy respectively.
- the obtaining module is specifically used for:
- the characteristic parameter is a physiological signal indicator of the sub-signal
- the blood pressure estimation device further includes: a training module;
- the acquisition module is also used for:
- the second signal data includes: a second ECG signal and a second pulse wave signal;
- the second ECG signal is the tester's ECG signal;
- the pulse wave signal is the test Personnel’s pulse wave signal;
- the training module is configured to obtain a first loss function according to the output parameter and the second signal data; the first loss function represents the difference between the output parameter and the second signal data; When the first loss function is less than a first preset value, it is determined that the autoencoder is successfully trained.
- the blood pressure estimation method and device provided in this embodiment obtain the coded signal, feature parameters, and multi-scale entropy by obtaining the user's first signal data, and input the coded signal, feature parameters and multi-scale entropy as input to the blood pressure estimation Model. Since the estimated blood pressure in the blood pressure estimation model has a corresponding relationship with the coded signal, feature parameters and multi-scale entropy, the estimated blood pressure can be obtained by acquiring the user coded signal, feature parameters and multi-scale entropy according to the corresponding relationship. Using the user's first signal data to extract multiple types of data, and using multiple types of data to estimate the user's blood pressure can improve the accuracy of blood pressure estimation.
- FIG. 1 is a schematic flowchart of a blood pressure estimation method provided by an embodiment of the application
- FIG. 2 is a schematic flowchart of a blood pressure estimation method provided by another embodiment of this application.
- FIG. 3 is a schematic flowchart of a method for obtaining multi-scale entropy according to an embodiment of the application
- FIG. 4 is a schematic flowchart of a training method for an autoencoder provided by an embodiment of this application;
- FIG. 5 is a schematic flowchart of a blood pressure estimation model training method provided by an embodiment of the application.
- FIG. 6 is a schematic structural diagram of a blood pressure estimation device provided by an embodiment of the application.
- FIG. 7 is a schematic structural diagram of a blood pressure estimation device provided by another embodiment of the application.
- Fig. 1 is a schematic flowchart of a blood pressure estimation method provided by an embodiment of the application. As shown in Fig. 1, the method includes:
- the encoded signal is a signal after the first signal data is encoded by a self-encoder.
- the first signal data includes: a first electrocardiogram signal and a first pulse wave signal.
- the first ECG signal is the user's ECG signal
- the first pulse wave signal is the user's pulse wave signal.
- the characteristic parameter is the physiological signal index of the first signal data. Multi-scale entropy characterizes the complexity of the first signal data.
- the input parameters include three types of data: encoded signals, feature parameters, and multi-scale entropy.
- the three types of data are all obtained through the user's first signal data. After the same signal data is extracted from different aspects, it is input into the blood pressure estimation model, which improves the accuracy of blood pressure estimation.
- the estimated blood pressure has a corresponding relationship with the coded signal, feature parameters and multi-scale entropy respectively.
- the blood pressure estimation method obtains the coded signal, feature parameters and multi-scale entropy by obtaining the user's first signal data, and inputs the coded signal, feature parameters and multi-scale entropy as input into the blood pressure estimation model . Since the estimated blood pressure in the blood pressure estimation model has a corresponding relationship with the coded signal, feature parameters and multi-scale entropy, the estimated blood pressure can be obtained by acquiring the user coded signal, feature parameters and multi-scale entropy according to the corresponding relationship. Using the user's first signal data to extract multiple types of data, and using multiple types of data to estimate the user's blood pressure can improve the accuracy of blood pressure estimation.
- FIG. 2 is a schematic flowchart of a blood pressure estimation method according to another embodiment of the application.
- S101 includes:
- the acquired first signal data is filtered, and moving average filtering may be used to eliminate interference signals in the first signal data.
- the first signal data is segmented according to the signal period T of the first signal wave.
- the first ECG signal is segmented according to the heartbeat period;
- the first pulse wave signal is segmented.
- the first signal data is segmented, and the time length of the sub-signals that may be obtained is [0.2s, 0.4s], [ 0.4s, 0.6s], [0.6s, 0.8s], [0.8s, 1s], [1s, 1.2s].
- alignment needs to be performed according to the interval in which the sub-signal is located, and optionally, alignment can be performed to the middle value of the two thresholds of the interval.
- the sub-signal needs to be aligned to 0.3s. If the length of the sub-signal is within [0.2s, 0.3s], the sub-signal can be aligned to 0.3s; If the length of the sub-signal is within [0.3s, 0.4s], Ke uses the cutting method to align the sub-signal to 0.3s. The alignment of the remaining signals is similar to the sub-signals with a length interval of [0.2s, 0.4s].
- the sub-signals with a length interval of [0.4s, 0.6s] are aligned to 0.5s.
- the sub-signals with a length interval of [0.6s, 0.8s] are aligned to 0.7s.
- the sub-signals with a length interval of [0.8s, 1s] are aligned to 0.9s.
- the sub-signals with a length interval of [1s, 1.2s] are aligned to 1.1s.
- the sub-signal includes the first ECG signal of one signal period T and the first pulse wave signal of one signal period T, so the size of the sub-signal is T*2.
- S101-3 Use any sub-signal as an encoding input parameter of the self-encoder to obtain an encoded signal.
- S101-4 Use the encoded signal as a decoding input parameter of the self-encoder to obtain first output signal data.
- the sub-signal is encoded and decoded by the self-encoder, which realizes the denoising and compression of the sub-signal, which is convenient for extracting useful information.
- S101-5 Acquire characteristic parameters according to the first output signal data.
- the characteristic parameter is the physiological signal index of the sub-signal.
- the characteristic parameters include any combination of one or more of the following: the time interval from the ECG R peak to the pulse wave valley point in the same cardiac cycle, the time interval from the ECG R peak to the pulse wave slope maximum point in the same cardiac cycle, the ECG R Time interval from peak to pulse wave peak point in the same cardiac cycle, heart rate, reflectivity, systolic duration, systolic-diastolic duration ratio, diastolic duration ratio, ascent time, end-systolic volume, end-diastolic volume, relative end-systolic volume, systolic-diastolic volume ratio.
- the reflectivity satisfies the following formula:
- R is the reflectivity
- a is the amplitude of the pulse wave contraction peak in the sub-signal
- b is the difference between a and the amplitude of the pulse wave diastolic peak in the sub-signal.
- the contraction duration satisfies the following formula:
- ST is the contraction duration
- tn n is the time point of the pulse wave dicrotic notch in the sub-signal
- tf n is the time point of the pulse wave trough in the sub-signal.
- the systolic-diastolic duration ratio satisfies the following formula:
- STR is the systolic-diastolic duration ratio
- tf n+1 is the time point of the pulse trough value in the next sub-signal.
- the diastolic duration ratio satisfies the following formula:
- DTR is the diastolic duration ratio.
- ST is the rise time
- tp n is the time point of the pulse wave contraction peak in the sub-signal.
- the end-systolic volume satisfies the following formula:
- DV is the end-systolic volume
- PPG is the pulse wave signal
- RSV is the relative end-systolic volume.
- the systolic-diastolic volume ratio satisfies the following formula:
- SDVR is the systolic-diastolic volume ratio.
- the first signal data is encoded and decoded by the self-encoder, and the second output signal data is data after denoising and dimensionality reduction of the first signal data.
- FIG. 3 is a schematic flowchart of a method for obtaining multi-scale entropy according to an embodiment of this application.
- S101-7 includes:
- x(i) is the i-th vector in the second output signal data, 1 ⁇ i ⁇ n, 1 ⁇ j ⁇ n/ ⁇ . 1 ⁇ 20, ⁇ is an integer.
- the first sequence is [1,2,3,4].
- n 8. ⁇ takes 4
- the second sequence obtained is [3/4,7/4], [11/4,15/4].
- z(i) [y(i),y(i+1),y(i+m-1)], 1 ⁇ i ⁇ n/ ⁇ -m+1;
- z(j) [y( j),y(j+1),y(j+m-1)], 1 ⁇ j ⁇ n/ ⁇ -m+1, i ⁇ j.
- the standard deviation obtained by calculating the second output signal data is SD, and r may be 0.15*SD.
- h(i) [y(i),y(i+1),y(i+m-1),y(i+m)], 1 ⁇ i ⁇ n/ ⁇ -m+1
- h (j) [y(j),y(j+1),y(j+m-1),y(j+m)], 1 ⁇ j ⁇ n/ ⁇ -m+1.
- E(m) represents multi-scale entropy.
- Multi-scale entropy characterizes the complexity of the first signal data. The larger the value of multi-scale entropy, the greater the difference between the m+1-dimensional vector and the m-dimensional vector obtained by the first signal data, the less the data of the first signal data is repeated, and the more complex the first signal data; conversely, the multi-scale entropy The smaller the value of, the smaller the difference between the m+1-dimensional vector and the m-dimensional vector obtained by the first signal data, the more data the first signal data repeats, and the simpler the first signal data.
- FIG. 4 is a schematic flowchart of an autoencoder training method provided by an embodiment of this application. As shown in FIG. 4, before S101 shown in FIG. 1, the method further includes:
- the second signal data includes: a second ECG signal and a second pulse wave signal.
- the second ECG signal is the tester's ECG signal.
- the pulse wave signal is the pulse wave signal of the tester.
- S202 Input the second signal data into the self-encoder to obtain output parameters.
- the first loss function represents the difference between the output parameter and the second signal data.
- an optional solution for training the autoencoder in Figure 4 is as follows, specifically:
- the second signal data is the signal matrix S.
- R represents the output parameter
- the first loss function can be obtained by the following formula:
- L1 represents the first loss function.
- the coefficient in the self-encoder is adjusted according to the first loss function.
- FIG. 5 is a schematic flowchart of a blood pressure estimation model training method provided by an embodiment of the application. As shown in FIG. 5, before S102, that is, before using the blood pressure estimation model, the training of the blood pressure estimation model is further included. for:
- the blood pressure data includes: systolic blood pressure sbp1 and diastolic blood pressure dbp1.
- S302 Input blood pressure data and output parameters into a blood pressure estimation model to obtain output blood pressure.
- the output blood pressure includes: output systolic blood pressure sbp2 and output diastolic blood pressure dbp2.
- the second signal data is input to the successfully trained autoencoder to obtain output parameters.
- the acquired output parameters include: training coded signal, training feature parameter and training multi-scale entropy.
- the encoded signal of the training is the signal after the second signal data is encoded by the trained autoencoder;
- the characteristic parameter of the training is the physiological signal index of the second signal data;
- the multi-scale entropy of the training represents the complexity of the second signal data .
- the method of obtaining output parameters is similar to the method of obtaining input parameters in Figure 2.
- the blood pressure estimation model may be a regressor, and a back propagation algorithm may be used to train the regressor used for blood pressure estimation.
- S303 Obtain a second loss function according to the output blood pressure and blood pressure data.
- the second loss function represents the difference between the output blood pressure and the blood pressure data.
- the second loss function satisfies the following formula:
- L2 ⁇ sbp1-sbp2 ⁇ 2 + ⁇ dbp1-dbp2 ⁇ 2 ;
- L2 represents the second loss function.
- the parameters of the blood pressure estimation model are adjusted according to the second loss function.
- FIG. 6 is a schematic structural diagram of a blood pressure estimation device provided by an embodiment of this application.
- This embodiment provides a blood pressure estimation device for executing the above-mentioned method embodiments.
- the device Including: an acquisition module 401 and an estimation module 402.
- the obtaining module 401 is used to obtain input parameters.
- the input parameters include coded signals, characteristic parameters and multi-scale entropy; among them, the coded signal is the first signal data encoded by the self-encoder; the first signal data includes: the first electrocardiogram signal and the first pulse wave signal; An ECG signal is the user's ECG signal, and the first pulse wave signal is the user's pulse wave signal; the characteristic parameter is the physiological signal index of the first signal data; and the multi-scale entropy represents the complexity of the first signal data.
- the estimation module 402 is used to input the input parameters into the blood pressure estimation model to obtain the estimated blood pressure; the estimated blood pressure respectively has a corresponding relationship with the encoded signal, the characteristic parameter and the multi-scale entropy.
- the obtaining module 401 is specifically configured to: obtain the first signal data.
- the first signal data is segmented to obtain multiple sub-signals. Use any sub-signal as the encoding input parameter of the self-encoder to obtain the encoded signal.
- the encoded signal is used as the decoding input parameter of the self-encoder to obtain the first output signal data.
- the characteristic parameter is obtained; the characteristic parameter is the physiological signal index of the sub-signal.
- the first signal data is used as the codec input parameter of the self-encoder to obtain the second output signal data.
- multi-scale entropy is obtained.
- FIG. 7 is a schematic structural diagram of a blood pressure estimation device provided by another embodiment of this application.
- the blood pressure estimation device further includes a training module 501.
- the acquisition module 401 is also used to: acquire second signal data; the second signal data includes: a second ECG signal and a second pulse wave signal; the second ECG signal is the tester's ECG signal; the pulse wave signal is a test Person's pulse wave signal. Input the second signal data into the self-encoder to obtain output parameters.
- the training module 501 is configured to obtain the first loss function according to the output parameters and the second signal data.
- the first loss function represents the difference between the output parameter and the second signal data. When the first loss function is less than the first preset value, it is determined that the autoencoder training is successful.
- the foregoing device is used to execute the method provided in the foregoing embodiment, and its implementation principle and technical effect are similar, and will not be repeated here.
- the present invention also provides a program product, such as a computer-readable storage medium, including a program, which is used to execute the foregoing method embodiment when executed by a processor.
- a program product such as a computer-readable storage medium, including a program, which is used to execute the foregoing method embodiment when executed by a processor.
- the disclosed device and method may be implemented in other ways.
- the device embodiments described above are merely illustrative, for example, the division of units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or integrated. To another system, or some features can be ignored, or not implemented.
- the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
- the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
- the functional units in the various embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
- the above-mentioned integrated unit may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units.
- the above-mentioned integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium.
- the above-mentioned software functional unit is stored in a storage medium and includes several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (English: processor) execute the method of each embodiment of the present invention Part of the steps.
- the aforementioned storage media include: U disk, mobile hard disk, read-only memory (English: Read-Only Memory, abbreviated as: ROM), random access memory (English: Random Access Memory, abbreviated as: RAM), magnetic disk or optical disk, etc.
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Abstract
Description
Claims (10)
- 一种血压估计方法,其特征在于,包括:获取输入参数,所述输入参数包含编码信号、特征参数和多尺度熵;其中,所述编码信号为第一信号数据通过自编码器编码后的信号;所述第一信号数据包括:第一心电信号和第一脉搏波信号;所述第一心电信号为用户的心电信号,所述第一脉搏波信号为所述用户的脉搏波信号;所述特征参数为所述第一信号数据的生理信号指标;所述多尺度熵表征所述第一信号数据的复杂程度;将所述输入参数输入血压估计模型,获得估计血压;所述估计血压分别与所述编码信号、所述特征参数以及所述多尺度熵具有对应关系。
- 如权利要求1所述的血压估计方法,其特征在于,所述获取输入参数,包括:获取所述第一信号数据;将所述第一信号数据进行分段,获得多个子信号;将任意一个所述子信号作为所述自编码器的编码输入参数,获得所述编码信号;将所述编码信号作为所述自编码器的解码输入参数,获得第一输出信号数据;根据所述第一输出信号数据,获取所述特征参数;其中所述特 征参数为所述子信号的生理信号指标;将所述第一信号数据作为所述自编码器的编解码输入参数,获得第二输出信号数据;根据所述第二输出信号数据,获取所述多尺度熵。
- 如权利要求2所述的血压估计方法,其特征在于,所述根据所述第二输出信号数据,获取所述多尺度熵,包括:获取所述第二输出信号数据,所述第二输出信号数据为第一序列x(n),n取值为正整数;选取超参数τ,通过所述第二输出信号数据,得到第二序列,所述第二序列满足下式:其中,y(j)为所述第二序列,x(i)为第二输出信号数据中第i个向量,1≤i≤n,1≤j≤n/τ,1≤τ≤20;将所述第二序列分为多个m维向量,所述多个m维向量为z(k),m取值为正整数,1≤k≤n/τ-m+1;统计多个m维向量中,满足‖z(i)-z(j)‖ ∞≤r的向量的个数Bi,并计算第一平均个数B (τ,m,r),所述第一平均个数B (τ,m,r)满足下式:其中,z(i)=[y(i),y(i+1),y(i+m-1)],1≤i≤n/τ-m+1;z(j)=[y(j),y(j+1),y(j+m-1)],1≤j≤n/τ-m+1,i≠j;将所述第二序列分为多个m+1维向量,所述多个m+1维向量 为h(k);统计多个m+1向量中,满足‖h(i)-h(j)‖ ∞≤r的向量的个数Ci,并计算第二平均个数C (τ,m,r),所述第二平均个数C (τ,m,r)满足下式:其中,h(i)=[y(i),y(i+1),y(i+m-1),y(i+m)],1≤i≤n/τ-m+1,h(j)=[y(j),y(j+1),y(j+m-1),y(j+m)],1≤j≤n/τ-m+1;根据所述第一平均个数B (τ,m,r)和所述第二平均个数C (τ,m,r),获得所述多尺度熵;所述多尺度熵满足下式:其中,E(m)表示多尺度熵。
- 如权利要求2所述的血压估计方法,其特征在于,所述特征参数包括下述一项或多项的任意组合:心电图R峰到同一心动周期内脉搏波谷值点的时间间隔、心电图R峰到同一心动周期内脉搏波斜率最大值点的时间间隔、心电图R峰到同一心动周期内脉搏波峰值点的时间间隔、心率、反射率、收缩时长、收缩舒张时长比、舒张时长比、上升时间、收缩末期容积、舒张末期容积、相对收缩末期容积、收缩舒张容积比。
- 如权利要求1所述的血压估计方法,其特征在于,所述获取输入参数之前,还包括:获取第二信号数据;所述第二信号数据包括:第二心电信号和第二脉搏波信号;所述第二心电信号为测试人员的心电信号;所述 脉搏波信号为所述测试人员的脉搏波信号;将所述第二信号数据输入所述自编码器,获得输出参数;根据所述输出参数与所述第二信号数据,获取第一损失函数;所述第一损失函数表征所述输出参数与所述第二信号数据的差值;当所述第一损失函数小于第一预设值时,则确定所述自编码器训练成功。
- 如权利要求5所述的血压估计方法,其特征在于,获取所述第二信号数据,所述第二信号数据为信号矩阵S;将所述第二信号数据输入所述自编码器,获得所述输出参数,所述输出参数可通过下式获得:R=decoder(encoder(S));其中R表示所述输出参数;根据所述输出参数与所述第二信号数据,获取所述第一损失函数,所述第一损失函数可通过下式获得:L1=‖S-R‖ 2;其中,L1表示所述第一损失函数;当所述第一损失函数小于第一预设值时,则确定所述自编码器训练成功。
- 如权利要求4所述的血压估计方法,其特征在于,所述将所述输入参数输入血压估计模型,获得估计血压之前,还包括:获取血压数据,所述血压数据与所述第二信号数据同一时间获 取,所述血压数据包括:收缩压sbp1和舒张压dbp1;将所述血压数据与所述输出参数输入所述血压估计模型,获得输出血压;所述输出血压包括:输出收缩压sbp2和输出舒张压dbp2;根据所述输出血压与所述血压数据,获取第二损失函数;所述第二损失函数表征所述输出血压与所述血压数据的差值;所述第二损失函数满足下式:L2=‖sbp1-sbp2‖ 2+‖dbp1-dbp2‖ 2;其中,L2表示所述第二损失函数;当所述第二损失函数小于第二预设值时,则确定所述血压估计模型训练成功。
- 一种血压估计装置,其特征在于,包括:获取模块和估计模块;所述获取模块,用于获取输入参数,所述输入参数包含编码信号、特征参数和多尺度熵;其中,所述编码信号为第一信号数据通过自编码器编码后的信号;所述第一信号数据包括:第一心电信号和第一脉搏波信号;所述第一心电信号为用户的心电信号,所述第一脉搏波信号为所述用户的脉搏波信号;所述特征参数为所述第一信号数据的生理信号指标;所述多尺度熵表征所述第一信号数据的复杂程度;所述估计模块,用于将所述输入参数输入血压估计模型,获得估计血压;所述估计血压分别与所述编码信号、所述特征参数以及所述多尺度熵具有对应关系。
- 如权利要求8所述的血压估计装置,其特征在于,所述获取模块,具体用于:获取所述第一信号数据;将所述第一信号数据进行分段,获得多个子信号;将任意一个所述子信号作为所述自编码器的编码输入参数,获得所述编码信号;将所述编码信号作为所述自编码器的解码输入参数,获得第一输出信号数据;根据所述第一输出信号数据,获取所述特征参数;其中所述特征参数为所述子信号的生理信号指标;将所述第一信号数据作为所述自编码器的编解码输入参数,获得第二输出信号数据;根据所述第二输出信号数据,获取所述多尺度熵。
- 如权利要求8所述的血压估计装置,其特征在于,还包括:训练模块;所述获取模块,还用于:获取第二信号数据;所述第二信号数据包括:第二心电信号和第二脉搏波信号;所述第二心电信号为测试人员的心电信号;所述脉搏波信号为所述测试人员的脉搏波信号;将所述第二信号数据输入所述自编码器,获得输出参数;所述训练模块,用于根据所述输出参数与所述第二信号数据, 获取第一损失函数;所述第一损失函数表征所述输出参数与所述第二信号数据的差值;当所述第一损失函数小于第一预设值时,则确定所述自编码器训练成功。
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