CN103211624B - Method and device for improving accuracy of Doppler fetal heart rate data - Google Patents
Method and device for improving accuracy of Doppler fetal heart rate data Download PDFInfo
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Abstract
The invention relates to a method and a device for improving the accuracy of Doppler fetal heart rate data. The method comprises steps of respectively performing hardware zero-crossing checking processing and self-correlation processing on preprocessed fetal heart Doppler envelope signals so as to obtain a first fetal heart rate and a second fetal heart rate; updating a corrected heart rate zone with the most second fetal heart rate occurrence probability through the first fetal heart rate; enabling a measured interval to be more accurate through updating the corrected heart rate zone with the most second fetal heart rate occurrence probability so as to obtain the more accurate and higher-statistic probability corrected heart rate zone with the most second fetal heart rate occurrence probability; and furthermore, obtaining the more accurate human body heart rate value. By utilizing the method, the monitoring intermediate data is adjusted and corrected so as to improve the detection accuracy, less hardware resources are needed, and the method is low in cost and easy to implement.
Description
Technical field
the present invention relates to fetal heart rate signal process field, be specifically related to a kind of method and the device thereof that improve Doppler's fetal heart rate data accuracy.
Background technology
fetal Heart Rate detects and has great importance in clinical diagnosis, the especially monitoring of perinatal stage Fetal Heart Rate, more contributes to improving delivery of fetus quality, reduces fetal anomaly rate and mortality rate.Fetal Heart Rate detects roughly point two stages, mainly master is detected as with fetal rhythm Doppler in early stage (front 28 pregnant weeks), mainly master is detected as with fetal monitor in the later stage (after 28 pregnant weeks), both main distinctions are fetal rhythm Doppler is continuous ultrasound Doppler, transmitting power is bigger, check for short time Fetal Heart Rate, general lighter, small and exquisite for the equipment detected, price is relatively cheap; Fetal monitor is pulse ultrasonic Doppler, and transmitting power is little, detects for long-time Fetal Heart Rate, and comparatively large for the equipment relative volume checked, price is relatively expensive.
in the Fetal Heart Rate of ultrasonic doppler is asked for, autocorrelation technique is one and generally acknowledges the maturation method used, it has can make the characteristic that periodic signal is strengthened and random noise is weakened, the impact of interference on signal can be reduced to a certain extent, so all generally use on fetal rhythm Doppler and fetal monitor, but in the process after auto-correlation, both have larger difference, occur that the reason of this situation is that fetal rhythm Doppler detects in short-term, generally a few second at least, a few minutes at most, so comparatively speaking, more focus on out the speed of value, and fetal monitor is long-time detection, generally minimum is 20 minutes, several hours or tens hours at most, so more focus on numerical stability comparatively speaking.
at present, in prior art, fetal rhythm Doppler detection and fetal monitor detect all comparatively complexity of post processing comparatively speaking, the processing method that can be used on fetal rhythm Doppler is not suitable for being used on fetal monitor, and the post-processing approach that fetal rhythm Doppler detects needs more hardware resource, causes cost too high.
Summary of the invention
for overcoming above-mentioned defect, it is low that namely object of the present invention is to provide a kind of implementation cost, and hardware resource requirements is less and be easy to the method for raising Doppler fetal heart rate data accuracy that realizes.
the present invention also aims to the device that this raising of a kind of application Doppler fetal heart rate data exact method is provided.
the object of the invention is to be achieved through the following technical solutions:
a kind of method improving Doppler's fetal heart rate data accuracy of the present invention, comprising:
pretreated fetal rhythm Doppler envelope signal is carried out the process of hardware zero passage detection, exports impulse wave;
try to achieve two interpulse intervals according to described impulse wave, and calculate the first Fetal Heart Rate according to this interval;
pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtains auto-correlation result sequence;
peakvalue's checking is carried out to auto-correlation result sequence, determines the first main peak value, and try to achieve fetal heart cycle according to this first main peak value, and then calculate second fetus heart rate, utilize the first Fetal Heart Rate to revise second fetus heart rate, obtain revised second fetus heart rate;
determine and obtain the maximum heart rate interval of revised second fetus heart rate probability of occurrence.
as a modification of the present invention, described pretreated fetal rhythm Doppler envelope signal is carried out hardware zero passage detection treatment step before also comprise default effective heart rate interval; Describedly to determine and the heart rate interval obtaining revised second fetus heart rate probability of occurrence maximum is: preset effective heart rate interval by revised second fetus heart rate upgrade described, obtain the heart rate interval that revised second fetus heart rate probability of occurrence is maximum.
improve as another kind of the present invention, described first Fetal Heart Rate that utilizes to the step that second fetus heart rate is revised is:
first Fetal Heart Rate and second fetus heart rate are contrasted, judge that whether second fetus heart rate is effective multiple proportion of the first Fetal Heart Rate, if, using second fetus heart rate as revised second fetus heart rate, if not, calculate which multiple value of the first Fetal Heart Rate to drop on the maximum heart rate interval of revised second fetus heart rate probability of occurrence, the first Fetal Heart Rate is multiplied by this multiple value as revised second fetus heart rate.
as a further improvement on the present invention, described first Fetal Heart Rate that utilizes to the step that second fetus heart rate is revised is:
first Fetal Heart Rate and second fetus heart rate are contrasted, if both differences are less than predetermined threshold value, using second fetus heart rate as revised second fetus heart rate; If both differ by more than predetermined threshold value, then judge that whether second fetus heart rate is effective multiple proportion of the first Fetal Heart Rate, if, using second fetus heart rate as revised second fetus heart rate, if not, calculating which multiple value of the first Fetal Heart Rate drops on the maximum heart rate interval of second fetus heart rate probability of occurrence, and the first Fetal Heart Rate is multiplied by this multiple value as revised second fetus heart rate.
further improve as of the present invention, the pretreatment in described pretreated fetal rhythm Doppler envelope signal is: carry out denoising, Filtering Processing to fetal rhythm Doppler envelope signal data; Describedly pretreated fetal rhythm Doppler envelope signal is carried out hardware zero passage detection be treated to: judge whether fetal rhythm Doppler envelope signal exceedes predetermined threshold value, if exceed predetermined threshold value, export impulse wave, otherwise export 0.
apply a device for above-mentioned raising Doppler fetal heart rate data exact method, this device mainly comprises:
hardware zero passage detection unit, for pretreated fetal rhythm Doppler envelope signal is carried out zero passage detection, and exports impulse wave;
pulse spacing computing unit, is connected with hardware zero passage detection unit, according to the impulse wave that hardware zero passage detection unit exports, calculates two interpulse intervals;
first Fetal Heart Rate computing unit, is connected with pulse spacing computing unit, according to the interpulse interval that pulse spacing computing unit calculates, calculates the first Fetal Heart Rate;
auto-correlation processing unit, for pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtains auto-correlation result sequence;
peak detection unit, is connected with auto-correlation processing unit, obtains the first main peak value according to the auto-correlation result sequence that auto-correlation processing unit exports;
second fetus heart rate computing unit, is connected with peak detection unit, calculates the second fetal heart frequency according to the first main peak value that peak detection unit exports;
heart rate interval probability statistics unit, carries out process according to second fetus heart rate data value revised in scheduled duration and calculates, determine the heart rate interval that revised second fetus heart rate probability of occurrence is maximum;
second fetus heart rate amending unit, is connected with the first Fetal Heart Rate computing unit, second fetus heart rate computing unit and heart rate interval probability statistics unit, the first Fetal Heart Rate and second fetus heart rate is contrasted, obtain revised second fetus heart rate; According to revised second fetus heart rate, described heart rate interval probability statistics unit again carries out process to revised second fetus heart rate data value and calculates, and upgrades the heart rate interval that revised second fetus heart rate probability of occurrence is maximum.
as a modification of the present invention, described device also comprises pretreatment unit; Described pretreatment unit carries out denoising, Filtering Processing to fetal rhythm Doppler envelope signal.
as a further improvement on the present invention, described device also comprises data acquisition unit; Described data acquisition unit is responsible for gathering fetal rhythm Doppler envelope signal.
further improve as of the present invention, described device also comprises:
fetal Heart Rate determining unit, described Fetal Heart Rate determining unit is connected with second fetus heart rate amending unit, for revised second fetus heart rate is treated to Fetal Heart Rate video data;
display unit, described display unit is connected with Fetal Heart Rate determining unit, for Fetal Heart Rate video data is carried out output display.
a kind of method improving Doppler's fetal heart rate data accuracy provided by the invention, by pretreated fetal rhythm Doppler envelope signal being carried out the process of hardware zero passage detection respectively and auto-correlation processing obtains the first Fetal Heart Rate and second fetus heart rate, and by the first Fetal Heart Rate, the heart rate interval that revised second fetus heart rate probability of occurrence is maximum is upgraded, by the renewal to the maximum heart rate interval of revised second fetus heart rate probability of occurrence, make the interval measured more accurate; The heart rate interval that the revised second fetus heart rate probability of occurrence that the measurement data that the device of a kind of Doppler of raising of the present invention fetal heart rate data accuracy is obtained is more accurate, its statistical probability value is higher is maximum, can obtain human heart rate's numerical value more accurately further.The present invention revises improves the accuracy detected by carrying out adjusting to the intermediate data of monitoring, and hardware resource required for it is few, and cost is low, is easy to realization.
Accompanying drawing explanation
for ease of illustrating, the present invention is described in detail by following preferred embodiment and accompanying drawing.
fig. 1 is the fetal rhythm Doppler envelope signal collected;
fig. 2 is the pulse wave signal that hardware zero passage detection exports;
fig. 3 is auto-correlation result sequence;
fig. 4 is a kind of flow chart improving Doppler's fetal heart rate data exact method of the present invention;
fig. 5 is a kind of concrete implementing procedure figure improving Doppler's fetal heart rate data exact method of the present invention;
fig. 6 is that the one of revised second fetus heart rate in the inventive method determines flow chart;
fig. 7 is that the another kind of revised second fetus heart rate in the inventive method determines flow chart;
fig. 8 is a kind of schematic diagram improving Doppler's fetal heart rate data accuracy device of the present invention.
Detailed description of the invention
in order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
improve a method for Doppler's fetal heart rate data accuracy, the signal of acquisition and processing is the fetal rhythm Doppler envelope signal of ultrasonic echo.As shown in Figure 1, be the fetal rhythm Doppler envelope signal collected, pretreatment is carried out to this fetal rhythm Doppler envelope signal, mainly the process such as denoising, filtering is carried out to this fetal rhythm Doppler envelope signal.As shown in Figure 4, the method comprises the steps:
pretreated fetal rhythm Doppler envelope signal is divided into two-way, and a road is used for the process of hardware zero passage detection, and a road is used for auto-correlation processing.
, hardware zero passage detection, by pretreated fetal rhythm Doppler envelope signal by hardware zero passage detection, export impulse wave, detailed process is: judge whether fetal rhythm Doppler envelope signal exceedes predetermined threshold value, if exceed predetermined threshold value, exports impulse wave, otherwise export 0, as shown in Figure 2.
, calculate the pulse spacing, try to achieve two interpulse intervals by impulse wave.
, calculate the first Fetal Heart Rate, calculate the first Fetal Heart Rate according to the interval that two are interpulse.
, auto-correlation processing, pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtains auto-correlation result sequence, as shown in Figure 3.
, peakvalue's checking, peakvalue's checking is carried out to the auto-correlation result sequence obtained, determines the first main peak value;
106, calculate second fetus heart rate, the first main peak value according to auto-correlation result sequence tries to achieve fetal heart cycle, and then conversion calculates second fetus heart rate.
, determine and obtain the maximum heart rate interval of revised second fetus heart rate probability of occurrence.Computing is carried out to the revised second fetus heart rate data value obtained, determine the heart rate interval that revised second fetus heart rate probability of occurrence is maximum, if first time obtains revised second fetus heart rate, then this revised second fetus heart rate data value quantity is one, be followed successively by basis, this revised second fetus heart rate data value quantity progressively increases.Describedly carry out computing to revised second fetus heart rate data value and then determine that the method for the heart rate interval that revised second fetus heart rate probability of occurrence is maximum can be added up by by stages also can differing the method compared by carrying out two numerical value respectively to revised second fetus heart rate data value, judging whether its difference is less than predetermined threshold value to determine two numerical value is in same heart rate interval, also can by carrying out extreme value judgement to revised second fetus heart rate data values whole in scheduled duration, obtain a maximum and a minima, calculate the difference of other data values and this maxima and minima to judge which heart rate interval this data value is positioned at, then the heart rate interval that probability of occurrence is maximum is obtained, in this embodiment, preferred use by stages statistical method tries to achieve the maximum heart rate interval of revised second fetus heart rate probability of occurrence.Compared by the first Fetal Heart Rate and second fetus heart rate, second fetus heart rate is revised, obtain revised second fetus heart rate.The revised second fetus heart rate of acquisition is finally utilized to upgrade the heart rate interval that revised second fetus heart rate probability of occurrence is maximum.
for the ease of understanding, with another embodiment, present invention is described below, and see Fig. 5 and Fig. 6, the concrete step implemented is as follows:
200, presetting effective heart rate interval, within the scope of effective heart rate interval 30-240BPM, take 10BPM as heart rate interval is example, presets effective heart rate interval, can be divided into 10-20BPM, 20-30BPM etc.
pretreated fetal rhythm Doppler envelope signal is divided into two-way, and a road is used for the process of hardware zero passage detection, and a road is used for auto-correlation processing.
, hardware zero passage detection.By pretreated fetal rhythm Doppler envelope signal by hardware zero passage detection, export impulse wave, detailed process is: judge whether fetal rhythm Doppler envelope signal exceedes predetermined threshold value, if exceed predetermined threshold value, exports impulse wave, otherwise exports 0, as shown in Figure 2.
, calculate the pulse spacing.Two interpulse intervals are tried to achieve by impulse wave.
, calculate the first Fetal Heart Rate.The first Fetal Heart Rate is calculated according to the interval that two interpulse.
, auto-correlation processing.Pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtains auto-correlation result sequence.As shown in Figure 3.
, peakvalue's checking.Peakvalue's checking is carried out to the auto-correlation result sequence obtained, determines the first main peak value;
206, second fetus heart rate is calculated.The first main peak value according to auto-correlation result sequence tries to achieve fetal heart cycle, and then conversion calculates second fetus heart rate.
, statistics heart rate interval probability, according to the effective heart rate interval preset, to the distributed area of second fetus heart rate result revised in nearest a period of time, statistics heart rate interval probability.Specifically exactly the revised second fetus heart rate result in nearest a period of time is carried out by stages statistics, determine the heart rate interval occurring maximum probability, such as using 10BPM as a heart rate interval, the result of calculation of 5 revised second fetus hearts rate is respectively 125BPM, 125BPM, 124BPM, 144BPM, 145BPM, so just there is heart rate interval is 120BPM-130BPM and 140BPM-150BPM, and the probability of appearance is respectively 3/5 and 2/5.The maximum heart rate interval of probability of occurrence is 120BPM-130BPM, this effective heart rate interval preset for presetting invariant intervals, simultaneously this heart rate interval start and end value all in effective fetal rhythm scope 30-240BPM.
, obtain revised second fetus heart rate, as described in Figure 6, obtain the flow chart of revised second fetus heart rate, specifically comprise:
2081, judge that whether second fetus heart rate is effective multiple proportion of the first Fetal Heart Rate, be specially: judge that whether second fetus heart rate is the multiple of the first Fetal Heart Rate, and all whether the first Fetal Heart Rate and second fetus heart rate in effective fetal rhythm scope 30-240BPM, if, then enter step 2082, if not, then step 2083 is entered.
, using second fetus heart rate as revised second fetus heart rate.
, determine revised second fetus heart rate according to the heart rate interval of maximum probability.If second fetus heart rate is not effective multiple proportion of the first Fetal Heart Rate, so just according to the heart rate interval that probability of occurrence in step 207 is maximum, second fetus heart rate is revised.The method revised is: see which multiple of the first Fetal Heart Rate drops on the heart rate interval of maximum probability, it is exactly revised second fetus heart rate that the first Fetal Heart Rate is multiplied by that multiple.According to revised second fetus heart rate, enter step 207, again by stages statistics is carried out to revised second fetus heart rate data value, upgrade the heart rate interval that revised second fetus heart rate probability of occurrence is maximum.As the citing in above-mentioned 207 steps, if the existing revised second fetus heart rate data obtained is 148BPM, then revised second fetus heart rate result of calculation is respectively 125BPM, 124BPM, 144BPM, 145BPM, 148BPM, namely the revised second fetus heart rate data value 125BPM of first time acquisition is replaced before, and so just there is heart rate interval is 120BPM-130BPM and 140BPM-150BPM, and the probability of appearance is respectively 2/5 and 3/5.Namely the maximum heart rate interval of probability of occurrence is updated to 140BPM-150BPM.
as shown in Figure 7, obtain the another kind of flow chart of revised second fetus heart rate, specifically comprise:
2084, judge that whether the first Fetal Heart Rate is consistent with second fetus heart rate, both namely judging, differ whether be less than predetermined threshold value.If both are less than predetermined threshold value at difference, enter step 2088; If both differ by more than predetermined threshold value, then enter step 2085.
, judge that whether second fetus heart rate is effective multiple proportion of the first Fetal Heart Rate, be specially: judge that whether second fetus heart rate is the multiple of the first Fetal Heart Rate, and all whether the first Fetal Heart Rate and second fetus heart rate in effective fetal rhythm scope 30-240BPM, if, then enter step 2086, if not, then step 2087 is entered.
, using second fetus heart rate as revised second fetus heart rate.
, determine revised second fetus heart rate according to the heart rate interval of maximum probability.If the first Fetal Heart Rate, second fetus heart rate differ by more than predetermined threshold value and second fetus heart rate is not effective multiple proportion of the first Fetal Heart Rate, so just according to the heart rate interval that probability of occurrence in step 207 is maximum, second fetus heart rate is revised.The method revised is: see which multiple of the first Fetal Heart Rate drops on the heart rate interval of maximum probability, it is exactly revised second fetus heart rate that the first Fetal Heart Rate is multiplied by that multiple.
, using second fetus heart rate as revised second fetus heart rate.
according to revised second fetus heart rate, enter step 207, again by stages statistics is carried out to revised second fetus heart rate data value, upgrade the heart rate interval that revised second fetus heart rate probability of occurrence is maximum.
as shown in Figure 7, a kind of device improving Doppler's fetal heart rate data accuracy of the present invention, its structure composed is as follows:
data acquisition unit 301, being responsible for gathering needs fetal rhythm Doppler envelope signal to be processed;
pretreatment unit 302, is connected with data acquisition unit 301, mainly carries out the process such as denoising, filtering to the fetal rhythm Doppler envelope signal that data acquisition unit 301 collects.
fetal rhythm Doppler envelope signal after pretreatment unit process is divided into two-way: a road is given hardware zero passage detection unit 303, tunnel and given auto-correlation processing unit 306.
hardware zero passage detection unit 303, is connected with pretreatment unit 302, carries out zero passage detection, and export impulse wave for the fetal rhythm Doppler envelope signal processed by pretreatment unit 302.
pulse spacing computing unit 304, is connected with hardware zero passage detection unit 303, according to the impulse wave that hardware zero passage detection unit 303 exports, calculates the interval of two pulses.
first Fetal Heart Rate computing unit 305, is connected with pulse spacing computing unit 304, according to the pulse spacing that pulse spacing computing unit 304 calculates, calculates the first Fetal Heart Rate.
auto-correlation processing unit 306, is connected with pretreatment unit 302, for pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtains auto-correlation result sequence.
peak detection unit 307, is connected with auto-correlation processing unit 306, obtains the first main peak value according to the auto-correlation result sequence that auto-correlation processing unit 306 exports;
second fetus heart rate computing unit 308, is connected with peak detection unit 307, according to the first main peak value that peak detection unit 307 exports, calculates the second fetal heart frequency.
heart rate interval probability statistics unit 309, by stages statistics is carried out according to the revised second fetus heart rate data value in scheduled duration, determine the heart rate interval that revised second fetus heart rate probability of occurrence is maximum, if first time obtains revised second fetus HR values.The revised second fetus heart rate obtained is stored as first revised second fetus heart rate data value, increases gradually and upgrade this revised second fetus heart rate data value.
second fetus heart rate amending unit 310, be connected with the first Fetal Heart Rate computing unit 305, second fetus heart rate computing unit 308 and heart rate interval probability statistics unit 309, revised second fetus heart rate is determined according to the first Fetal Heart Rate, second fetus heart rate and heart rate interval probability, simultaneously the revised second fetus heart rate result determined according to second fetus heart rate amending unit 310 of heart rate interval probability statistics unit 309, upgrades the parameter of heart rate interval probability statistics unit 309.First Fetal Heart Rate, second fetus heart rate mainly contrast by second fetus heart rate amending unit 310, if both differences are less than predetermined threshold value, so second fetus heart rate is in the main true, using second fetus heart rate as revised second fetus heart rate.If both differ by more than predetermined threshold value, then judge whether to meet multiple proportion, if met, using second fetus heart rate as revised second fetus heart rate.If both differ by more than predetermined threshold value and do not meet multiple proportion again, so just according to the heart rate interval that probability of occurrence is maximum, second fetus heart rate result is revised.The method revised is: see which multiple of the first Fetal Heart Rate drops on the heart rate interval of maximum probability, it is exactly revised second fetus heart rate that the first Fetal Heart Rate is multiplied by that multiple.According to the revised second fetus heart rate obtained, again by stages statistics is carried out to heart rate interval probability statistics unit 309, upgrade the heart rate interval that revised second fetus heart rate probability of occurrence is maximum.
fetal Heart Rate determining unit 311, described Fetal Heart Rate determining unit 311 is connected with second fetus heart rate amending unit 310, for revised second fetus heart rate is treated to Fetal Heart Rate video data; The revised second fetus heart rate obtained due to second fetus heart rate amending unit 310 can not be directly used in display translation, and this Fetal Heart Rate determining unit 311 is for being treated to the Fetal Heart Rate video data that can be used for display translation by revised second fetus heart rate.
display unit 312, described display unit 312 is connected with Fetal Heart Rate determining unit 311, for Fetal Heart Rate video data is carried out output display.
the foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. improve a method for Doppler's fetal heart rate data accuracy, it is characterized in that, comprising:
Pretreated fetal rhythm Doppler envelope signal is carried out the process of hardware zero passage detection, exports impulse wave;
Try to achieve two interpulse intervals according to described impulse wave, and calculate the first Fetal Heart Rate according to this interval;
Pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtains auto-correlation result sequence;
Peakvalue's checking is carried out to auto-correlation result sequence, determine the first main peak value, and try to achieve fetal heart cycle according to this first main peak value, and then calculate second fetus heart rate, utilize the first Fetal Heart Rate to revise second fetus heart rate, described first Fetal Heart Rate that utilizes to the step that second fetus heart rate is revised is:
First Fetal Heart Rate and second fetus heart rate are contrasted, judge that whether second fetus heart rate is effective multiple proportion of the first Fetal Heart Rate, if, using second fetus heart rate as revised second fetus heart rate, if not, calculate which multiple value of the first Fetal Heart Rate to drop on the maximum heart rate interval of revised second fetus heart rate probability of occurrence, the first Fetal Heart Rate is multiplied by this multiple value as revised second fetus heart rate;
Determine and obtain the maximum heart rate interval of revised second fetus heart rate probability of occurrence.
2. a kind of method improving Doppler's fetal heart rate data accuracy according to claim 1, is characterized in that, described pretreated fetal rhythm Doppler envelope signal is carried out hardware zero passage detection treatment step before also comprise default effective heart rate interval; Describedly to determine and the heart rate interval obtaining revised second fetus heart rate probability of occurrence maximum is: preset effective heart rate interval by revised second fetus heart rate upgrade described, obtain the heart rate interval that revised second fetus heart rate probability of occurrence is maximum.
3. a kind of method improving Doppler's fetal heart rate data accuracy according to claim 2, it is characterized in that, describedly judge that whether second fetus heart rate is effective multiple proportion of the first Fetal Heart Rate and is: judge that whether second fetus heart rate is the multiple of the first Fetal Heart Rate, and all whether the first Fetal Heart Rate and second fetus heart rate in effective fetal rhythm scope 30-240BPM.
4. a kind of method improving Doppler's fetal heart rate data accuracy according to claim 3, is characterized in that, the pretreatment in described pretreated fetal rhythm Doppler envelope signal is: carry out denoising, Filtering Processing to fetal rhythm Doppler envelope signal data; Describedly pretreated fetal rhythm Doppler envelope signal is carried out hardware zero passage detection be treated to: judge whether fetal rhythm Doppler envelope signal exceedes predetermined threshold value, if exceed predetermined threshold value, export impulse wave, otherwise export 0.
5. improve a method for Doppler's fetal heart rate data accuracy, it is characterized in that, comprising:
Pretreated fetal rhythm Doppler envelope signal is carried out the process of hardware zero passage detection, exports impulse wave;
Try to achieve two interpulse intervals according to described impulse wave, and calculate the first Fetal Heart Rate according to this interval;
Pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtains auto-correlation result sequence;
Peakvalue's checking is carried out to auto-correlation result sequence, determine the first main peak value, and try to achieve fetal heart cycle according to this first main peak value, and then calculate second fetus heart rate, utilize the first Fetal Heart Rate to revise second fetus heart rate, described first Fetal Heart Rate that utilizes to the step that second fetus heart rate is revised is:
First Fetal Heart Rate and second fetus heart rate are contrasted, if both differences are less than predetermined threshold value, using second fetus heart rate as revised second fetus heart rate; If both differ by more than predetermined threshold value, then judge that whether second fetus heart rate is effective multiple proportion of the first Fetal Heart Rate, if, using second fetus heart rate as revised second fetus heart rate, if not, calculating which multiple value of the first Fetal Heart Rate drops on the maximum heart rate interval of second fetus heart rate probability of occurrence, and the first Fetal Heart Rate is multiplied by this multiple value as revised second fetus heart rate;
Determine and obtain the maximum heart rate interval of revised second fetus heart rate probability of occurrence.
6. a kind of method improving Doppler's fetal heart rate data accuracy according to claim 5, is characterized in that, described pretreated fetal rhythm Doppler envelope signal is carried out hardware zero passage detection treatment step before also comprise default effective heart rate interval; Describedly to determine and the heart rate interval obtaining revised second fetus heart rate probability of occurrence maximum is: preset effective heart rate interval by revised second fetus heart rate upgrade described, obtain the heart rate interval that revised second fetus heart rate probability of occurrence is maximum.
7. a kind of method improving Doppler's fetal heart rate data accuracy according to claim 6, it is characterized in that, describedly judge that whether second fetus heart rate is effective multiple proportion of the first Fetal Heart Rate and is: judge that whether second fetus heart rate is the multiple of the first Fetal Heart Rate, and all whether the first Fetal Heart Rate and second fetus heart rate in effective fetal rhythm scope 30-240BPM.
8. a kind of method improving Doppler's fetal heart rate data accuracy according to claim 7, is characterized in that, the pretreatment in described pretreated fetal rhythm Doppler envelope signal is: carry out denoising, Filtering Processing to fetal rhythm Doppler envelope signal data; Describedly pretreated fetal rhythm Doppler envelope signal is carried out hardware zero passage detection be treated to: judge whether fetal rhythm Doppler envelope signal exceedes predetermined threshold value, if exceed predetermined threshold value, export impulse wave, otherwise export 0.
9. improve a device for Doppler's fetal heart rate data exact method, it is characterized in that, this device mainly comprises:
Hardware zero passage detection unit, for pretreated fetal rhythm Doppler envelope signal is carried out zero passage detection, and exports impulse wave;
Pulse spacing computing unit, is connected with hardware zero passage detection unit, according to the impulse wave that hardware zero passage detection unit exports, calculates two interpulse intervals;
First Fetal Heart Rate computing unit, is connected with pulse spacing computing unit, according to the interpulse interval that pulse spacing computing unit calculates, calculates the first Fetal Heart Rate;
Auto-correlation processing unit, for pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtains auto-correlation result sequence;
Peak detection unit, is connected with auto-correlation processing unit, obtains the first main peak value according to the auto-correlation result sequence that auto-correlation processing unit exports;
Second fetus heart rate computing unit, is connected with peak detection unit, calculates the second fetal heart frequency according to the first main peak value that peak detection unit exports;
Heart rate interval probability statistics unit, carries out process according to second fetus heart rate data value revised in scheduled duration and calculates, determine the heart rate interval that revised second fetus heart rate probability of occurrence is maximum;
Second fetus heart rate amending unit, is connected with the first Fetal Heart Rate computing unit, second fetus heart rate computing unit and heart rate interval probability statistics unit; First Fetal Heart Rate and second fetus heart rate are contrasted, if both are less than predetermined threshold value at difference, then second fetus heart rate is correct, so using second fetus heart rate as revised second fetus heart rate, if both differ by more than predetermined threshold value, then judge whether to meet multiple proportion, if met, using second fetus heart rate as revised second fetus heart rate; If both differ by more than predetermined threshold value and do not meet multiple proportion again, so drop on the heart rate interval of maximum probability according to which multiple of the first Fetal Heart Rate, the first Fetal Heart Rate is multiplied by that multiple and obtains revised second fetus heart rate; According to revised second fetus heart rate, described heart rate interval probability statistics unit again carries out process to revised second fetus heart rate data value and calculates, and upgrades the heart rate interval that revised second fetus heart rate probability of occurrence is maximum.
10. a kind of device improving Doppler's fetal heart rate data exact method according to claim 9, it is characterized in that, described device also comprises pretreatment unit; Described pretreatment unit carries out denoising, Filtering Processing to fetal rhythm Doppler envelope signal.
11. a kind of devices improving Doppler's fetal heart rate data exact method according to claim 10, it is characterized in that, described device also comprises data acquisition unit; Described data acquisition unit is responsible for gathering fetal rhythm Doppler envelope signal.
12. a kind of devices improving Doppler's fetal heart rate data exact method according to claim 11, it is characterized in that, described device also comprises:
Fetal Heart Rate determining unit, described Fetal Heart Rate determining unit is connected with second fetus heart rate amending unit, for revised second fetus heart rate is treated to Fetal Heart Rate video data;
Display unit, described display unit is connected with Fetal Heart Rate determining unit, for Fetal Heart Rate video data is carried out output display.
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| CN103494605B (en) * | 2013-10-09 | 2015-04-15 | 清华大学 | Heart rate detection method and device |
| US9451893B2 (en) * | 2014-08-18 | 2016-09-27 | Cameron Health, Inc. | Calculation of self-correlation in an implantable cardiac device |
| CN104873222B (en) * | 2015-05-08 | 2016-03-02 | 浙江铭众生物医学创业投资有限公司 | A kind of Fetal Heart Rate detection method based on intelligent mobile terminal |
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| US3982528A (en) * | 1975-02-24 | 1976-09-28 | Brattle Instrument Corporation | Apparatus for refining signals derived from fetal heartbeats |
| DE10345717B4 (en) * | 2003-10-01 | 2005-12-08 | Trium Analysis Online Gmbh | Method and device for determining the fetal heart rate |
| CN2787142Y (en) * | 2005-05-18 | 2006-06-14 | 华中科技大学 | Portable remote sensing instrument for heart rate when exercising |
| JP5333427B2 (en) * | 2010-12-20 | 2013-11-06 | 沖電気工業株式会社 | HEART RATE DETECTOR, HEART RATE DETECTING METHOD, AND PROGRAM |
| CN102151136A (en) * | 2011-01-06 | 2011-08-17 | 南京工程学院 | Portable minitype exercise stress monitoring device and monitoring method thereof |
| CN102048558B (en) * | 2011-01-28 | 2012-05-23 | 深圳市理邦精密仪器股份有限公司 | Fetal heart rate signal processing method and device thereof |
| CN102688070A (en) * | 2012-06-08 | 2012-09-26 | 深圳市理邦精密仪器股份有限公司 | Fetus monitoring data processing method and system |
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