CN102613970B - Method for expanding channel number of collected multichannel fetal electrocardiosignals - Google Patents
Method for expanding channel number of collected multichannel fetal electrocardiosignals Download PDFInfo
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- CN102613970B CN102613970B CN201210030954.8A CN201210030954A CN102613970B CN 102613970 B CN102613970 B CN 102613970B CN 201210030954 A CN201210030954 A CN 201210030954A CN 102613970 B CN102613970 B CN 102613970B
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- 230000001605 fetal effect Effects 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000004590 computer program Methods 0.000 claims abstract description 8
- 238000000746 purification Methods 0.000 claims abstract description 5
- 208000007502 anemia Diseases 0.000 claims description 15
- 230000033764 rhythmic process Effects 0.000 description 21
- 239000000203 mixture Substances 0.000 description 10
- 210000002784 stomach Anatomy 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 210000003414 extremity Anatomy 0.000 description 3
- 210000003754 fetus Anatomy 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000011664 signaling Effects 0.000 description 3
- 230000036982 action potential Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000003141 lower extremity Anatomy 0.000 description 2
- 210000001364 upper extremity Anatomy 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 210000004061 pubic symphysis Anatomy 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000004441 surface measurement Methods 0.000 description 1
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Abstract
The invention provides a method for expanding the channel number of collected multichannel fetal electrocardiosignals, which is based on a computer program. The method is characterized by comprising the following steps: firstly, reading fetal electrocardiosignals of all channels originally collected from the body surface of a pregnant woman, and totally setting N channels, ensuring that the read fetal electrocardiosignals of the N channels are combined pairwise, so as to produce N (N-1)/2 combinations; and ensuring that the difference of the electrocardiosignals of the two channels of each combination derives fetal electrocardiosignals of one channel and the fetal electrocardiosignals of the original N channels and fetal electrocardiosignals of the newly derived N (N-1)/2 channels form fetal electrocardiosignals of N (N+1)/2 channels, so as to select fetal electrocardiosignals with higher signal to noise ratio than that of the original N channels or to further perform noise reduction processing and purification processing.
Description
Technical field
The application relates to a kind of method of the port number of the multichannel fetal rhythm signal of telecommunication gathering being expanded based on computer program.Computer herein can be embedded special-purpose computer, can be also general purpose computer.The object of expansion is in order to capture the Fetal ECG that signal to noise ratio is higher.
Lay at anemia of pregnant woman's body surface the Fetal ECG signal that electrode gathers, in fact, except fetal rhythm electricity, also have parent electrocardio, myoelectricity and other interference etc.For the convenience of narrating, the application regards parent electrocardio, myoelectricity and other interference wherein as the background noise of Fetal ECG.
Background technology
, by the generation of bioelectric current, can there is corresponding Potential distribution at anemia of pregnant woman's body surface in the action potential that heart of fetus shrinks and diastole produces, any 2 of body surface has a voltage (potential difference).Place 4 electrodes at anemia of pregnant woman's body surface, wherein 1 is with reference to ground electrode, 1 indifferent electrode for inhibition common mode disturbances, can gather 2 tunnels to the Fetal ECG signal with reference to ground, and port number is 2; In the same way, place N electrode (N is more than or equal to 4) at anemia of pregnant woman's body surface, can gather N-2 road to the Fetal ECG signal with reference to ground, port number is N-2.
At present, have the equipment that gathers multichannel Fetal ECG signal, obtain 4 tunnel lead signals as the product G Y-EXPL of Huanan Medical Electrical Tech Co., Ltd., Henan uses 6 electrodes, acquisition channel number is 4; The Wireless Fetal Electrocardiogram Monitoring System based on S3C2410 of Fudan University's development adopts 4 electrodes to obtain 2 tunnel lead signals, and acquisition channel number is 2.The NEMO tire ECG Gathering System in Europe, totally 10 electrodes, gather 8 tunnel lead signals, and acquisition channel number is 8.The electrodeplate that anemia of pregnant woman's body surface is placed is more, and the fetal rhythm signal of telecommunication physical channel number of collection is more, more easily captures high-quality Fetal ECG signal.But due to the restraining factors of ease of use and capacity aspect, the fetal rhythm signal of telecommunication physical channel number of fetal rhythm electricity equipment actual acquisition can not be too many.
Standard 12 is led worth reference of way that electrocardiograph detects adult electrocardiogram.According to its standard, when measurement, lay 10 electrodes at adult's body surface, be respectively---right upper extremity electrode VR, left upper extremity electrode VL, right lower limb electrode RL, left lower limb electrode VF, 6 chest electrode C1, C2, C3, C4, C5, C6; Can obtain adult's 12 lead electrocardiosignal---I, II, III, aVR, aVL, aVF, V1, V2, V3, V4, V5, V6 based on these electrodes.If represent the potential value at its body surface position, respective electrode place by the numbering of each electrode, standard 12 lead signals are defined as: (1) standard limb lead---leads I=VL-VR, leads I I=VF-VR, leads I II=VF-VL; (2) augmented limb lead---aVR=VR-(VL+VF)/2, aVL=VL-(VR+VF)/2, aVF=VF-(VL+VR)/2; (3) chest lead---breast is led Vi=Ci-(VR+VL+VF)/3, i=1 ..., 6.Here, in fact, standard 12 is led electrocardiograph and is only gathered 8 tunnel electrocardiosignaies, be that analog channel only has 8 tunnels, comprise the accurate limb lead signal of 2 road sign and 6 tunnel chest lead signals, other 4 road signals are to be calculated by computer program by certain formula by the 8 road signals that gather, and derive from.If 8 road signals of acquired original are respectively---I, II, V1, V2, V3, V4, V5, V6, other 4 lead signals calculate by table 1.
Table 1: standard 12 is led a kind of port number extended method of electrocardiograph
| III | aVR | aVL | aVF |
| II-I | -(I+II)/2 | I-II/2 | II-I/2 |
When standard 12 is led electrocardiograph by standard detection adult electrocardiogram, have 44 channel signals in other words that lead not gather, and actual be that computer program is expanded out.At present, how to expand its port number based on computer program from the multichannel Fetal ECG signal of anemia of pregnant woman's body surface collection, there is not yet report.
List of references:
[1] Huanan Medical Electrical Tech Co., Ltd., Henan, fetal electrocardiograph, in May, 2006, Chinese utility model patent: Z1200520111843.5
[2] Lu Yaosheng, Liang Yuhou: for the method and apparatus of monitoring contraction activities of mother womb and control labor, Chinese invention patent, application number: 03113712.1
[3] Wang Jiada, Liu Zuwang: the design of the Wireless Fetal Electrocardiogram Monitoring System based on S3C2410, Chinese Journal of Medical Instrumentation, the 7th phase of 31 volumes in 2007.
Summary of the invention
Goal of the invention.
Propose a kind of method that the port number of the multichannel Fetal ECG signal gathering is expanded, be intended to increase considerably port number, to can capture the Fetal ECG that signal to noise ratio is higher.
Technical scheme.
A kind of method of the port number of the multichannel Fetal ECG signal gathering being expanded based on computer program of the present invention, it is characterized in that, comprise the steps: that (1) read in the each passage Fetal ECG signal from anemia of pregnant woman's body surface acquired original, establishing is N passage altogether; (2) make the N passage fetal rhythm signal of telecommunication combination of two of reading in---there is altogether N (N-1)/2 kind of combination, make two channel signals of every kind of combination ask the poor fetal rhythm signal of telecommunication that derives 1 passage, together with the fetal rhythm signal of telecommunication of the former N passage fetal rhythm signal of telecommunication and the N of new derivative (N-1)/2 passage, formed the fetal rhythm signal of telecommunication of N (N+1)/2 passage, for you to choose go out than the higher fetal rhythm signal of telecommunication of former N channel signal signal to noise ratio or carry out further noise reduction, purification processes.Scheme flow chart is shown in accompanying drawing 1.
The scheme of above extended channel number is not that inventor arbitrarily proposes, but propose on the basis that utilizes certain law.These rules comprise: what (1) each group gathered wants the two passage anemia of pregnant woman body surface fetal rhythm signals of telecommunication of asking poor, be made as A and B, they are the voltage signal of corresponding anemia of pregnant woman's body surface two test points to reference ground respectively, they ask poor consequential signal (A-B) is the voltage signal between two body surface test points, has clear and definite physical significance; (2) each group is wanted two passage Fetal ECG signal A and the B that ask poor, although they all come from the action potential of heartbeat, but bang path difference, their phase place difference to some extent certainly, therefore, the Fetal ECG composition of their difference signal is likely greater than the Fetal ECG composition in A or B, sees shown in accompanying drawing 2; (3) the parent electrocardio composition in A and B, may obtain because their phase contrasts are little a little composition asking in poor, and Fetal ECG composition may obtain a large composition because their phase contrast is large, and make difference signal (A-B) improve Fetal ECG signal to noise ratio; (4) ask between two the poor very multichannel signal that derives, the physics voltage of a lot of point-to-point transmissions of corresponding body surface, therefore, must capture the body surface fetal rhythm signal of telecommunication that signal to noise ratio is higher in a wider context respectively.
Beneficial effect.
At present, there is not yet about the bibliographical information that the multichannel Fetal ECG signalling channel number gathering is expanded.
Standard 12 is led electrocardiogram, has 10 electrodes, and the electrocardiosignal physical channel number of collection is 8, and the port number by standard based on computer program amplification is 4, and 50% the port number that increased has occurred after expansion the signal of 12 passages being called 12 lead signals altogether.Standard 12 is led the effect that ecg equipment extended channel detects for adult's electrocardio, by common people are generally acknowledged.
Place anemia of pregnant woman's body surface measurement Fetal ECG signal if standard 12 is led to the electrode of electrocardiograph, and by expansion scheme of the present invention, the physical signalling of 8 passages that gather, ask between two after poor expansion, port number will increase 28,350% the port number that increased, the overall channel number after expansion reaches 36.Undoubtedly, compared with the extended method of leading signal with standard 12, this programme has stronger autgmentability.
Since being placed in electrode anemia of pregnant woman's body surface detection for the first time, people in 1906 record fetus electrocardiosignal, the history of existing more than 100 years, but, due to the difference of individual difference, fetal rhythm position, the fetus position, how from anemia of pregnant woman's stomach wall stably detection record to high-quality Fetal ECG signal, be puzzled people's a problem all the time.Carry out port number expansion by the present invention program, be equivalent to the detection of the signal that has carried out the point more much more than former body surface test point number, therefore, can capture to greatest extent Fetal ECG signal that the signal to noise ratio of body surface is high or establish better basis for further fetal rhythm electricity purification processes.
To be inventors lead that 10 electrodes are placed in anemia of pregnant woman's stomach wall by electrocardiograph and the signal of 8 passages gathering in hospital's standard 12 with accompanying drawing 5; In accompanying drawing 5, except II lead signals shows less fetal rhythm electric component, other channel signals all can only be seen parent electrocardio composition.What accompanying drawing 6 signals showed is V2, V4, V6 lead signals and their two-way in accompanying drawing 5 ask difference signal (V2-V4) and (V2-V6); From V2, V4, V6 lead signals, only see parent electrocardio composition, can't see Fetal ECG composition, but from their difference signal (V2-V4) with (V2-V6), can find obvious Fetal ECG composition, see arrow indication.From accompanying drawing 6, the present invention program's effectiveness, has some idea of.
Brief description of the drawings
Fig. 1, the method flow diagram that the multichannel Fetal ECG signalling channel number gathering is expanded.
Fig. 2, two channel signals are asked the poor principle schematic that strengthens Fetal ECG.
Fig. 3, the concrete layout schematic diagram of test electrode in embodiment.
Fig. 4, the concrete layout realistic picture of test electrode in embodiment.
Fig. 5, embodiment Plays 12 is led 8 passage stomach wall electrocardiosignaies of electrocardiograph acquisition and recording.
Fig. 6, in embodiment, acquired signal is asked poor result exemplary plot between two.
Detailed description of the invention (embodiment)
In hospital, a certain anemia of pregnant woman being led to electrocardiograph by Japanese photoelectricity standard 12---ECG-1350P is placed in stomach wall by electrode and has surveyed one group of data, and the layout of electrode is shown in shown in Fig. 3 and Fig. 4; Fig. 3 is the electrode arrangement under pregnant woman lays on her back, and wherein VR is placed in that pubic symphysis top stomach wall, VL are placed in top stomach wall at the bottom of palace, VF is placed in right side stomach wall.Image data is mfer form, the signal data that comprises 8 passages; Can data be downloaded to computer from electrocardiograph.
This programme to the step of 8 channel signal extended channel numbers that gather is: (1) reads in each passage Fetal ECG signal data of acquired original, is 8 passages altogether, sees shown in accompanying drawing 5; (2) 8 passage fetal rhythm signal of telecommunication combination of two, there are altogether 8 (8-1)/2=28 kind combinations, every kind of combination two signals are asked poor 1 the passage fetal rhythm signal of telecommunication that derives, together with 28 channel signals of the former 8 passage fetal rhythm signals of telecommunication and new derivative, form the signal of 8 (8+1)/2=36 passage, for you to choose go out than the higher fetal rhythm signal of telecommunication of former 8 channel signal signal to noise ratios or carry out further noise reduction, purification processes.Accompanying drawing 6 is asked poor consequential signal (V2-V4) and (V2-V6) for former passage V2, the V4, V6 signal and their two passages that gather.
Claims (1)
1. a method of the port number of the multichannel Fetal ECG signal gathering being expanded based on computer program, it is characterized in that, comprise the following steps: (1) reads in the each passage Fetal ECG signal from anemia of pregnant woman's body surface acquired original, establishing is N passage altogether; (2) make the N passage Fetal ECG signal combination of two of reading in---there is altogether N (N-1)/2 kind of combination, make two channel signals of every kind of combination ask the poor Fetal ECG signal that derives 1 passage, together with the Fetal ECG signal of former N passage Fetal ECG signal and the N of new derivative (N-1)/2 passage, formed the Fetal ECG signal of N (N+1)/2 passage, for you to choose go out than the higher Fetal ECG signal of former N channel signal signal to noise ratio or carry out further noise reduction, purification processes.
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| CN103767701A (en) * | 2014-01-10 | 2014-05-07 | 中南民族大学 | Wearable fetal electrocardiogram monitoring system and method based on smart phones |
| CN104274210B (en) * | 2014-09-24 | 2017-05-31 | 广州三星通信技术研究有限公司 | Fetal heart monitor and fetal rhythm monitoring method |
| CN107049303A (en) * | 2017-03-10 | 2017-08-18 | 哈尔滨工业大学 | It is a kind of that the adaptive Fetal ECG signal extraction system and method led with many chests is led based on many abdomens |
| CN109602414B (en) * | 2018-11-12 | 2022-01-28 | 安徽心之声医疗科技有限公司 | Multi-view-angle conversion electrocardiosignal data enhancement method |
| CN109758143B (en) * | 2019-02-22 | 2021-07-27 | 南京大学 | Method for enhancing multichannel electrocardiosignal recorded synchronously |
| CN113509188B (en) * | 2021-04-20 | 2022-08-26 | 天津大学 | Method and device for amplifying electroencephalogram signal, electronic device and storage medium |
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| CN200973709Y (en) * | 2006-11-22 | 2007-11-14 | 李楚雅 | Medical signals collecting device |
| CN100488448C (en) * | 2007-01-10 | 2009-05-20 | 赵峰 | Three-dimensional image electrocardiograph and implementation method |
| CN101467879A (en) * | 2007-12-26 | 2009-07-01 | 深圳迈瑞生物医疗电子股份有限公司 | Method and device for processing multi-lead synchronized electrocardiosignal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1660011A (en) * | 2004-06-11 | 2005-08-31 | 河南华南医电科技有限公司 | Digital typed electrocardiograph in twelve tracks possessing functions of regulating and beating stimulation of esophagus |
| CN200973709Y (en) * | 2006-11-22 | 2007-11-14 | 李楚雅 | Medical signals collecting device |
| CN100488448C (en) * | 2007-01-10 | 2009-05-20 | 赵峰 | Three-dimensional image electrocardiograph and implementation method |
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