CN102824175B - Respiratory gating signal acquiring device and method thereof - Google Patents
Respiratory gating signal acquiring device and method thereof Download PDFInfo
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- CN102824175B CN102824175B CN201110166168.6A CN201110166168A CN102824175B CN 102824175 B CN102824175 B CN 102824175B CN 201110166168 A CN201110166168 A CN 201110166168A CN 102824175 B CN102824175 B CN 102824175B
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Abstract
The invention provides a respiratory gating signal acquiring device, comprising a respiratory accessory, a first sensor, a first differential amplifier, a first delay unit, a first subtracter, a first operation amplifier and a first comparator, wherein the first sensor transforms a pressure signal acquired by the respiratory accessory into a differential electric signal; the first differential amplifier processes differential amplification to the differential electric signal so as to acquire a respiratory signal in form of a sine wave; the respiratory signal output by the first differential amplifier with a delayed respiratory signal which is delayed by the first delay unit are subtracted by the first subtracter and are amplified through the first operation amplifier; a subtracting signal output by the first operation amplifier is compared with a zero value by the first comparator so as to form the respiratory gating signal in form of a square wave signal; and the respiratory gating signal is used by a back end. According to the invention, acquisition of the respiratory gating signal is realized through a simple hardware circuit, so that cost can be reduced; and reliability is high.
Description
Technical field
The present invention relates to medical Instrument field, more specifically, relate to a kind of for obtaining breath gate-control signal acquisition device and the method for breath gate-control signal.
Background technology
In application during such as some medical imaging equipments of NMR (Nuclear Magnetic Resonance)-imaging (MRI) system, CT (computed tomography) equipment; respiratory movement due to patient; conventionally can when abdominal part imaging, produce respiration artefacts; thereby the definition of the image of imaging is produced to significantly impact; cause thus image quality to decline, thereby affected the diagnosis to focus.In current medical imaging equipment, in order to solve abdominal part imaging artifact problem, conventionally adopt respiratory gating technology evade and compensate.
Respiratory gating technology generally by measurement be attached to aerating gasbag on human body (such as, breathe bellyband) with respirometric pressure, change to reach and measure respirometric object.At present, mostly adopt electric pole type breath gate controlling system, in use, its electrode slice can be exposed in forceful electric power, magnetic field kind electrode formula breath gate controlling system, thereby can be interfered, thereby affects its normal work.In addition, the result of use of electric pole type respiration gate control is also subject to the cleannes of patient skin, the impact of doctor's the objective factors such as operant level, and because electrode slice is all disposable use, thereby increased its use cost.
In order to overcome the problems referred to above, in the patent application that be 200810055806.5 at application number, denomination of invention is " a kind of air pressure breath gate controlling system ", a kind of air pressure breath gate controlling system has been proposed.As depicted in figs. 1 and 2, this breath gate controlling system comprises breathing bellyband 1, buzzer 2, respiration gate control unit 3 and PC 4.On respiration gate control unit 3, be provided with breath gate-control signal input port 5, buzzer signal output port 6, communication port 7 and gate output port 8.Described respiration gate control unit 3 comprises MCU processor 31, multichannel selection equipment 32 and RS232 drive circuit 32.Described breath gate-control signal input port 5 outer ends connect described breathing bellyband 1 by airway 11, the inner is Bonding pressure sensor 34, signal filtering module 35, signal amplification module 36 and A/D modular converter 37 successively, and described A/D modular converter 37 connects described MCU processor 31 by transmission line; Described transmission line output port connects described buzzer 2 by transmission line, and described communication port 7 connects described PC 4 by transmission line, and described gate output port 8 connects the outsides equipment that is triggered; Described MCU processor 31 is connected with described RS232 drive circuit 33 by reversible link.
Yet, in above-mentioned patent application, there is following problems.First, gate-control signal obtain manner utilizes MCU to realize.Secondly, can not export simultaneously and show a plurality of signals.In addition, can not carry out pine and tension indicated number, thereby can not guarantee to obtain in the best condition signal.
Summary of the invention
In view of above-mentioned, the invention provides a kind of breath gate-control signal acquisition device and method that adopts the method for slope intercepting to realize by common hardware circuit, this breath gate-control signal acquisition device and method realize obtaining of breath gate-control signal by simple hardware circuit, thereby can reduce costs, and reliability is high.In addition, this breath gate-control signal acquisition device is by carrying out pine and tension indicated number, thereby breath gate-control signal is obtained in assurance in the best condition, has improved thus real-time and accuracy that breath gate-control signal gathers, and then image quality is provided.
According to an aspect of the present invention, provide a kind of breath gate-control signal acquisition device, having comprised: breathed adnexa, be worn on human body, for obtaining the pressure signal of patient when breathing; First sensor, is connected with described breathing adnexa by airway, the pressure signal obtaining for surveying described breathing adnexa, and change described pressure signal into differential electric signal; The first difference amplifier, for the differential electric signal of first sensor output is carried out to differential amplification, take acquisition form as sinusoidal wave breath signal; The first delay cell, has postponed breath signal for the breath signal of the first difference amplifier output is postponed to the first time delay to obtain, and is set to less than described the first time delay or equals 3 milliseconds; The first subtractor, for subtracting each other the breath signal of delay of the breath signal of described the first difference amplifier output and described the first delay cell output; The first operational amplifier, for amplifying the subtracted signal of described the first subtractor output; And first comparator, for subtracted signal and the null value of described the first operational amplifier output are compared, thereby the breath gate-control signal that acquisition form is square-wave signal is used for rear end.
In addition, in one or more examples, described breath gate-control signal acquisition device can also comprise the first adjustment unit, be used for the persistent period broadening of the useful signal of the breath gate-control signal of described the first comparator output or narrow to the first predetermined value, described the first predetermined value presets according to the requirement of back-end processing.
In addition, in one or more examples, described breath gate-control signal acquisition device can also comprise the second comparator, for the breath signal of described the first difference amplifier output and the first threshold voltage setting in advance are compared, and the 3rd comparator, for the breath signal of described the first difference amplifier output and the Second Threshold voltage setting in advance are compared, wherein, described first threshold voltage is greater than Second Threshold voltage, and, when described breath signal is greater than described first threshold voltage, described the second comparator output tension index signal, and when described breath signal is less than described Second Threshold voltage, described the 3rd comparator was exported loose index signal.
In addition, in one or more examples, described breath gate-control signal acquisition device can also comprise the second operational amplifier, for the breath signal of described the first difference amplifier output is carried out to operation amplifier; And modulating unit, for the breath signal of amplification of described the second operational amplifier output is modulated, wherein, the display unit that described modulated breath signal is transferred to computer by transmission line shows in real time.
In addition, in one or more examples, described breath gate-control signal acquisition device can also comprise alarm device, and described alarm device comprises: alarm ball, for the alarm ball of holding with a firm grip, send pressure signal when patient does not feel well; The second sensor, the pressure signal sending for surveying described alarm ball, and change surveyed pressure signal into differential electric signal; The second difference amplifier, for the differential electric signal of the second sensor output is carried out to differential amplification, take acquisition form as sinusoidal wave alarm signal; The second delay cell, for the alarm signal of described the second difference amplifier output is postponed to the second time delay to obtain delayed alarm signal, determined described the second time delay according to the cycle of described alarm signal; The second subtractor, for by the signal subtraction of delayed alarm of the alarm signal of described the second difference amplifier output and described the 3rd delay cell output; The 3rd operational amplifier, for amplifying the subtracted signal of described the second subtractor output; The 4th comparator, for subtracted signal and the null value of described the 3rd operational amplifier output are compared, thus the alarm control signal that acquisition form is square-wave signal; And second adjustment unit, for by the persistent period broadening of the useful signal of the alarm control signal of described the 4th comparator output or narrow to the second predetermined value, described the second predetermined value presets according to the time of fire alarming setting in advance.
According to a further aspect in the invention, provide a kind of for obtaining the method for breath gate-control signal, having comprised: obtained the pressure signal of patient when breathing; Change obtained pressure signal into differential electric signal; Described differential electric signal is carried out to differential amplification, take acquisition form as sinusoidal wave breath signal; Described breath signal is postponed to the first time delay and to obtain, postponed breath signal, be set to less than described the first time delay or equal 3 milliseconds; Described breath signal and the described breath signal that postponed are subtracted each other; Described subtracted signal is amplified; And described subtracted signal and null value are compared, thereby the breath gate-control signal that acquisition form is square-wave signal is used for rear end.
In addition, in one or more examples, described method can also comprise: by the persistent period broadening of the useful signal in obtained breath gate-control signal or narrow to the first predetermined value to meet the requirement of back-end processing, described the first predetermined value presets according to the requirement of back-end processing.
In addition, in one or more examples, described method can also comprise: described breath signal and the first threshold voltage or the Second Threshold voltage that set in advance are compared, to export tension index signal or to cross loose index signal, wherein, described first threshold voltage is greater than Second Threshold voltage, and, when described breath signal is greater than described first threshold voltage, described the second comparator output tension index signal, and when described breath signal is less than described Second Threshold voltage, described the 3rd comparator was exported loose index signal.
In addition, in one or more examples, described method can also comprise: described breath signal is carried out operation amplifier and modulated amplifying breath signal, and wherein, the display unit that described modulated breath signal is transferred to computer by transmission line shows in real time.
In addition, in one or more examples, described method can also comprise: the alarm ball of holding with a firm grip when patient does not feel well is sent pressure signal; Change detected pressure signal into differential electric signal; Described differential electric signal is carried out to differential amplification, take acquisition form as sinusoidal wave alarm signal; Described alarm signal is postponed to the second time delay to obtain delayed alarm signal, according to the cycle of described alarm signal, determine described the second time delay; By described alarm signal and the described signal subtraction of delayed alarm; Described subtracted signal is amplified; By described, amplified subtracted signal and null value compares, thus the alarm control signal that acquisition form is square-wave signal; And by the persistent period broadening of the useful signal in described alarm control signal or narrow to the second predetermined value, described the second predetermined value presets according to the time of fire alarming setting in advance.
In order to realize above-mentioned and relevant object, one or more aspects of the present invention comprise below by the feature that describes in detail and particularly point out in the claims.Explanation below and accompanying drawing describe some illustrative aspects of the present invention in detail.Yet, the indication of these aspects be only some modes that can use in the variety of way of principle of the present invention.In addition, the present invention is intended to comprise all these aspects and their equivalent.
Accompanying drawing explanation
According to following detailed description of carrying out with reference to accompanying drawing, above and other object of the present invention, feature and advantage will become more apparent.In the accompanying drawings:
Fig. 1 shows a kind of block diagram of existing vapour-pressure type door control system;
Fig. 2 shows the block diagram of the respiration gate control unit in existing vapour-pressure type door control system;
Fig. 3 shows according to the block diagram of the breath gate-control signal acquisition device of the first embodiment of the present invention;
Fig. 4 shows the oscillogram of the output signal of each assembly in the breath gate-control signal acquisition device shown in Fig. 3;
Fig. 5 shows according to of the present invention for obtaining the flow chart of the method for breath gate-control signal;
Fig. 6 shows the block diagram of breath gate-control signal acquisition device according to a second embodiment of the present invention;
Fig. 7 shows the block diagram of the breath gate-control signal acquisition device of a third embodiment in accordance with the invention; With
Fig. 8 shows the block diagram of the breath gate-control signal acquisition device of a fourth embodiment in accordance with the invention.
In institute's drawings attached, identical label is indicated similar or corresponding feature or function.
The specific embodiment
Various aspects of the present disclosure are described below.Should be understood that, instruction herein can be with varied form imbody, and disclosed any concrete structure, function or both are only representational in this article.Instruction based on herein, those skilled in the art should be understood that, an aspect disclosed herein can be independent of any other side and realize, and the two or more aspects in these aspects can combine according to variety of way.For example, can use the aspect of any number described in this paper, implement device or hands-on approach.In addition, can use other structure, function or except one or more aspects described in this paper or be not the 26S Proteasome Structure and Function of one or more aspects described in this paper, realize this device or put into practice this method.In addition, any aspect described herein can comprise at least one element of claim.
Each embodiment of the present invention is described below with reference to accompanying drawings.
(the first embodiment)
Fig. 3 shows according to the block diagram of the breath gate-control signal acquisition device 300 of the first embodiment of the present invention.
As shown in Figure 3, breath gate-control signal acquisition device 300 comprises breathing adnexa 310, first sensor 320, the first difference amplifier 330, the first delay cell 340, the first subtractor 350, the first operational amplifier 360, the first comparator 370 and the first adjustment unit 380.
When using according to breath gate-control signal acquisition device 300 of the present invention, breathe adnexa 310 and be worn on patient's health, for obtaining the pressure signal of patient when breathing.For example, breathing adnexa 310 can be to breathe bellyband.In use, by breathing bellyband, tie up the abdominal part patient, the pressure signal causing due to abdominal exercise for obtaining patient when breathing.Or described breathing adnexa 310 can be breathing bag etc.
Breathe adnexa 310 and be connected to first sensor 320 by airway (not shown).The pressure signal that described first sensor 320 obtains for surveying described breathing adnexa, and change described pressure signal into differential electric signal.
The first difference amplifier 330 is connected with the outfan of first sensor 320, for the differential electric signal of first sensor 320 outputs is carried out to differential amplification, take acquisition form as sinusoidal wave breath signal.Here, in described breath signal, when air-breathing, corresponding to slope, be positive part, during expiration, corresponding to slope, be negative part.
The first delay cell 340 is connected with the outfan of the first difference amplifier 330, for being postponed to the first time delay, the breath signal of the first difference amplifier 330 outputs postponed breath signal to obtain, pre-determined described the first time delay according to the cycle of described breath signal, for example, be set to less than or equal 3 milliseconds.For example, the respiratory frequency of supposing people is 1 minute 15 to 20 times, can be set to 3ms the first time delay with interior any value, such as 2.5ms.
The breath signal of the first difference amplifier 330 output and the first delay cell 340 outputs postpone two inputs that breath signal is imported into the first subtractor 350.In described the first subtractor 350, the breath signal of delay of the breath signal of described the first difference amplifier output and described the first delay cell output is subtracted each other.Then, obtained subtracted signal is input to the first operational amplifier 360.The subtracted signal of 360 pairs of described subtractor outputs of described the first operational amplifier is amplified.Here, the subtracted signal after the first operational amplifier 360 amplifies is that breath signal is deducted to the signal that postpones breath signal and obtain, and it is to have just to have negative waveshape signal.Owing to being set to for the first time delay, be less than or equal to 3 numbers, thus can guarantee that just half part of the waveshape signal of subtracted signal represents that in breath signal, slope is positive part, air-breathing corresponding to patient; And negative half part represents that in breath signal, slope is negative part, corresponding to patient, exhale.
The outfan of described the first operational amplifier 360 is connected with the input of the first comparator 370.Another input of described the first comparator 370 is connected with 0V.Described the first comparator 370 is for subtracted signal and the null value of described the first operational amplifier 360 outputs are compared, thereby the breath gate-control signal that acquisition form is square-wave signal is used for rear end, for example, and for the spectrometer signal of rear end.In described breath gate-control signal, air-breathing in high level interval scale when breath gate-control signal, in low level interval scale, exhale.In described breath gate-control signal, under different situations, useful signal can be high level signal, can be also low level signal.For example, while being spectrometer signal in rear end, useful signal is low level signal.
In order to meet the requirement of the spectrometer signal of rear end, preferably, in breath gate-control signal acquisition device 300 of the present invention, can also comprise the first adjustment unit 380.The input of described the first adjustment unit 380 is connected with the outfan of described the first comparator 370, be used for the persistent period broadening of the useful signal of the breath gate-control signal of described the first comparator 370 outputs or narrow to the first predetermined value, described the first predetermined value presets according to the requirement of back-end processing.So extremely broadening still narrows the persistent period, this depends on the needs of back-end processing.For example, when described breath gate-control signal is used for the spectrometer signal of rear end, in order to meet the requirement of described spectrometer signal, the persistent period of the low level signal in described breath gate-control signal (that is, useful signal) is broadened for 500ms is to 520ms.Described the first adjustment unit 380 can utilize d type flip flop to realize.About the persistent period of how utilizing d type flip flop broadening or narrowing the useful signal in breath gate-control signal, be apparent to those skilled in the art, at this, be not described in detail.
Fig. 4 shows the oscillogram of the output signal of each assembly in the breath gate-control signal acquisition device shown in Fig. 3.In Fig. 4, solid line sinusoidal wave form represents the output waveform of the first difference amplifier 330, dotted line sinusoidal wave form represents the output waveform of the first delay cell 340, solid line stack sinusoidal wave and dotted line sine wave represents breath signal and has postponed breath signal to subtract each other, and square-wave waveform represents the output waveform of the first comparator 370.
Fig. 5 shows according to of the present invention for obtaining the flow chart of the method for breath gate-control signal.
As shown in Figure 5, first, utilize breathing adnexa 310 to obtain the pressure signal (step S510) of patient when breathing.Then, utilize first sensor 320 to survey the pressure signal obtaining, and change obtained pressure signal into differential electric signal (step S520).Then, described differential electric signal is carried out to differential amplification, take acquisition form as sinusoidal wave breath signal (step S530).Then, described breath signal is postponed to the first time delay and to obtain, postponed breath signal, be set to less than described the first time delay or equal 3 milliseconds (step S540).In acquisition, postponed after breath signal, described breath signal and the described breath signal that postponed have been subtracted each other and amplified (step S550).Subsequently, described subtracted signal and null value are compared, thereby the breath gate-control signal that acquisition form is square-wave signal is used (step S560) for rear end.
In addition, preferably, in order to meet the requirement of back-end processing, described method can also comprise: by the persistent period broadening of the useful signal in obtained breath gate-control signal or narrow to the first predetermined value to meet the requirement of back-end processing, described the first predetermined value presets according to the requirement of back-end processing.
Above with reference to Fig. 3, to Fig. 5, the breath gate-control signal acquisition device according to first embodiment of the invention has been described.According to the breath gate-control signal acquisition device of the present embodiment, can utilize general hardware simplicity circuit to adopt the method for slope intercepting to realize, thereby can reduce costs, and reliability is high.In addition, due to what adopt in the present embodiment, be all usual hardware circuit, and without using special circuit, thus the problem that cannot realize that can avoid the stopping production due to this special circuit to cause.
(the second embodiment)
Fig. 6 shows according to the block diagram of the breath gate-control signal acquisition device 600 of second embodiment of the invention.
Fig. 6 is the improvement to the embodiment shown in Fig. 3.Known by comparison diagram 3 and Fig. 6, the difference of Fig. 6 and Fig. 3 is, Fig. 6 also includes the second comparator 670 and the 3rd comparator 680.Other parts in Fig. 6 are identical with Fig. 3, at this, no longer describe.
An input of the second comparator 670 is connected with the outfan of described the first difference amplifier 330, and another input of the second comparator 670 is connected with first threshold voltage.An input of the 3rd comparator 680 is connected with the outfan of described the first difference amplifier 330, and its another input is connected with Second Threshold voltage.Wherein, described first threshold voltage is greater than Second Threshold voltage.And the gain of the first difference amplifier and the first and second threshold voltages are set explicitly.In other words, when the gain of the first difference amplifier changes, the first and second threshold voltages also correspondingly change.
When described breath signal is greater than described first threshold voltage, described the second comparator 670 output tension index signals, thus make tension display lamp bright.When described breath signal is less than described Second Threshold voltage, described the 3rd comparator 680 was exported loose index signal, thereby made display lamp too loose bright.Thus, obtaining of breath gate-control signal adjusted.Here, described first threshold voltage and Second Threshold can be determined according to the type of applied breathing adnexa.For example, in the situation that breathing adnexa is breathing bag, first threshold voltage is 10V, and Second Threshold voltage is 3V.When breathing adnexa adopts other type, can adopt as required suitable value as the first and second threshold voltages.
In addition, said pine excessively or tension refer to breathing adnexa and are worn on the tightness on human body here.For example, breathe bellyband and tie up the tightness at people's abdominal part.When sending tension indication, need to adjust pine to breathe adnexa and be worn on the tightness on human body.When sending pine indication, need to tighten breathing adnexa and be worn on the tightness on human body.
According to the breath gate-control signal acquisition device of the second embodiment, when carrying out pine and tension indicated number, described breath signal and the first threshold voltage or the Second Threshold voltage that set in advance are compared, to export tension index signal or to cross loose index signal, wherein, described first threshold voltage is greater than Second Threshold voltage, and, when described breath signal is greater than described first threshold voltage, described the second comparator output tension index signal, and when described breath signal is less than described Second Threshold voltage, described the 3rd comparator was exported loose index signal.
According to the breath gate-control signal acquisition device of second embodiment of the invention, by pine and tension index signal were set, can carry out degree of tightness adjustment to obtaining of breath gate-control signal, thereby can guarantee to obtain in the best condition breath gate-control signal.
(the 3rd embodiment)
Fig. 7 shows according to the block diagram of the breath gate-control signal acquisition device 700 of third embodiment of the invention.
Fig. 7 is the improvement to the embodiment shown in Fig. 6.Known by comparison diagram 6 and Fig. 7, the difference of Fig. 7 and Fig. 6 is, the outfan that Fig. 7 also includes the second operational amplifier 760 and modulating unit 770, the second operational amplifiers 760 is connected with the input of modulating unit 770.Other parts in Fig. 7 are identical with Fig. 4, at this, no longer describe.
The input of the second operational amplifier 760 is connected with the outfan of the first difference amplifier 330, for the breath signal of described the first difference amplifier 330 outputs is carried out to operation amplifier, and the breath signal after operation amplifier is input to the input of modulating unit 770.In modulating unit 770, the breath signal after the second operational amplifier 760 amplifies is modulated.Then, by transmission line (not shown), the display unit (for example, display) that described modulated breath signal is transferred to computer shows in real time, thereby realizes the real-time demonstration of breath signal, for diagnosis, uses.
(the 4th embodiment)
Fig. 8 shows according to the block diagram of the breath gate-control signal acquisition device 800 of fourth embodiment of the invention.
Fig. 8 is the improvement to the embodiment shown in Fig. 7.Known by comparison diagram 7 and Fig. 8, the difference of Fig. 8 and Fig. 7 is, Fig. 8 also includes alarm device 810.Other parts in Fig. 8 are identical with Fig. 7, at this, no longer describe.
As shown in Figure 8, described alarm device 810 comprises alarm ball 811, the second sensor 812, the second difference amplifier 813, the second delay cell 814, the second subtractor 815, the 3rd operational amplifier 816, the 4th comparator 817 and the second adjustment unit 818.
When patient does not feel well, patient's alarm ball 811 of holding with a firm grip is sent pressure signal.Described the second sensor 812 is for surveying described pressure signal, and changes described pressure signal into differential electric signal.
The second difference amplifier 813 is connected with the outfan of the second sensor 812, for the differential electric signal of the second sensor 812 outputs is carried out to differential amplification, take acquisition form as sinusoidal wave alarm signal.
The second delay cell 814 is connected with the outfan of the second difference amplifier 813, for the alarm signal of the second difference amplifier 813 outputs is postponed to the second time delay to obtain delayed alarm signal, pre-determined described the second time delay according to the cycle of described alarm signal.In one example, can be set to a value in 1/1000 the scope in cycle that is less than described alarm signal described the second time delay.Preferably, can be set to less than or equal 3ms described the second time delay.
The signal of delayed alarm of the alarm signal of the second difference amplifier 813 outputs and the second delay cell 814 outputs is imported into two inputs of the second subtractor 815.In described the second subtractor 615, by the signal subtraction of delayed alarm of the alarm signal of described the second difference amplifier 813 outputs and described the second delay cell 814 outputs.Then, obtained subtracted signal is input to the 3rd operational amplifier 816.The subtracted signal of 816 pairs of described the second subtractor 815 outputs of described the 3rd operational amplifier is amplified.Here, the subtracted signal after the 3rd operational amplifier 816 amplifies is to have just to have negative waveshape signal.
The outfan of described the 3rd operational amplifier 816 is connected with the input of the 4th comparator 817.Another input of described the 4th comparator 817 is connected with 0V.Described the 4th comparator 817 is for subtracted signal and the null value of described the 3rd operational amplifier 616 outputs are compared, thus the alarm control signal that acquisition form is square-wave signal, for reporting to the police.
The input of described the second adjustment unit 818 is connected with the outfan of described the 4th comparator 817, be used for the persistent period broadening of the useful signal of the alarm control signal of described the 4th comparator 817 outputs or narrow to the second predetermined value, described the second predetermined value presets according to the time of fire alarming setting in advance.Equally, described the second adjustment unit 818 can utilize d type flip flop to realize.
When utilizing alarm device 810 to report to the police, the alarm ball of holding with a firm grip when patient does not feel well is sent pressure signal.Then, change detected pressure signal into differential electric signal; And described differential electric signal is carried out to differential amplification, take acquisition form as sinusoidal wave alarm signal.Then, three time delays of described alarm signal delay control, to obtain delayed alarm signal, are determined according to the cycle of described alarm signal described the 3rd time delay.Then, by described alarm signal and the described signal subtraction of delayed alarm amplification.Subtracted signal and the null value of described the 3rd operational amplifier output are compared, thus the alarm control signal that acquisition form is square-wave signal.Finally, by the persistent period broadening of the useful signal in the alarm control signal of described the 4th comparator output or narrow to the second predetermined value, described the second predetermined value presets according to the time of fire alarming setting in advance.
According to breath gate-control signal acquisition device and the method for the present embodiment, can according to the level of comfort of self, control and whether report to the police voluntarily by patient.
Above with reference to Fig. 3, to Fig. 8, the breath gate-control signal acquisition device of each embodiment has been described according to the present invention.Here be noted that above-described embodiment is only exemplary, and needn't limit the scope of the invention to above-mentioned specific embodiment.One skilled in the art can appreciate that and can above-described embodiment be carried out various combinations and be deleted, these various combinations and the embodiment that deletes rear acquisition be also within the scope of the invention.For example, can only the distinguishing characteristics between Fig. 5 and Fig. 4 is increased in Fig. 3 and form new embodiment, this new embodiment falls within the scope of the invention.Equally, also can for other distinguishing characteristics, process and form new embodiment according to above-mentioned similar fashion, these embodiment also within the scope of the invention.
Although disclosed content shows exemplary embodiment of the present invention above, it should be noted that under the prerequisite of scope of the present invention that does not deviate from claim restriction, can carry out multiple change and modification.According to the function of the claim to a method of inventive embodiments described herein, step and/or action, need not carry out with any particular order.In addition, although element of the present invention can be with individual formal description or requirement, also it is contemplated that a plurality of, unless be clearly restricted to odd number.
Although described each embodiment according to the present invention above with reference to figure, be described, it will be appreciated by those skilled in the art that each embodiment that the invention described above is proposed, can also on the basis that does not depart from content of the present invention, make various improvement.Therefore, protection scope of the present invention should be determined by the content of appending claims.
Claims (10)
1. a breath gate-control signal acquisition device, comprising:
Breathe adnexa, be worn on human body, for obtaining the pressure signal of patient when breathing;
First sensor, is connected with described breathing adnexa by airway, the pressure signal obtaining for surveying described breathing adnexa, and change described pressure signal into differential electric signal;
The first difference amplifier, for the differential electric signal of first sensor output is carried out to differential amplification, take acquisition form as sinusoidal wave breath signal;
The first delay cell, has postponed breath signal for the breath signal of the first difference amplifier output is postponed to the first time delay to obtain, and is set to less than described the first time delay or equals 3 milliseconds;
The first subtractor, for subtracting each other the breath signal of delay of the breath signal of described the first difference amplifier output and described the first delay cell output;
The first operational amplifier, for amplifying the subtracted signal of described the first subtractor output; And
The first comparator, for subtracted signal and the null value of described the first operational amplifier output are compared, thereby the breath gate-control signal that acquisition form is square-wave signal is used for rear end.
2. breath gate-control signal acquisition device as claimed in claim 1, also comprises:
The first adjustment unit, for by the persistent period broadening of the useful signal of the breath gate-control signal of described the first comparator output or narrow to the first predetermined value, described the first predetermined value presets according to the requirement of back-end processing.
3. breath gate-control signal acquisition device as claimed in claim 1, also comprises:
The second comparator, for the breath signal of described the first difference amplifier output and the first threshold voltage setting in advance are compared, and
The 3rd comparator, for the breath signal of described the first difference amplifier output and the Second Threshold voltage setting in advance are compared,
Wherein, described first threshold voltage is greater than Second Threshold voltage, and,
When described breath signal is greater than described first threshold voltage, described the second comparator output tension index signal, and when described breath signal is less than described Second Threshold voltage, described the 3rd comparator was exported loose index signal.
4. breath gate-control signal acquisition device as claimed in claim 1, also comprises:
The second operational amplifier, for carrying out operation amplifier to the breath signal of described difference amplifier output; And
Modulating unit, for the breath signal of amplification of described the second operational amplifier output is modulated,
Wherein, the display unit that described modulated breath signal is transferred to computer by transmission line shows in real time.
5. breath gate-control signal acquisition device as claimed in claim 1, also comprises alarm device, for not reporting to the police when patient feels well,
Described alarm device comprises:
Alarm ball, sends pressure signal for the alarm ball of holding with a firm grip when patient does not feel well;
The second sensor, the pressure signal sending for surveying described alarm ball, and change surveyed pressure signal into differential electric signal;
The second difference amplifier, for the differential electric signal of the second sensor output is carried out to differential amplification, take acquisition form as sinusoidal wave alarm signal;
The second delay cell, for the alarm signal of described the second difference amplifier output is postponed to the second time delay to obtain delayed alarm signal, determined described the second time delay according to the cycle of described alarm signal;
The second subtractor, for by the signal subtraction of delayed alarm of the alarm signal of described the second difference amplifier output and described the second delay cell output;
The 3rd operational amplifier, for amplifying the subtracted signal of described the second subtractor output;
The 4th comparator, for subtracted signal and the null value of described the 3rd operational amplifier output are compared, thus the alarm control signal that acquisition form is square-wave signal; And
The second adjustment unit, for by persistent period broadening or constriction to the second predetermined value of the useful signal of the alarm control signal of described the 4th comparator output, described the second predetermined value presets according to the time of fire alarming setting in advance.
6. breath gate-control signal acquisition device as claimed in claim 5, wherein, is set to less than or equals 3 milliseconds described the second time delay.
7. for obtaining a method for breath gate-control signal, comprising:
Obtain the pressure signal of patient when breathing;
Change obtained pressure signal into differential electric signal;
Described differential electric signal is carried out to differential amplification, take acquisition form as sinusoidal wave breath signal;
Described breath signal is postponed to the first time delay and to obtain, postponed breath signal, be set to less than described the first time delay or equal 3 milliseconds;
Described breath signal and the described breath signal that postponed are subtracted each other;
Described subtracted signal is amplified; And
Described subtracted signal and null value are compared, thereby the breath gate-control signal that acquisition form is square-wave signal is used for rear end.
8. method as claimed in claim 7, also comprises:
By the persistent period broadening of the useful signal in obtained breath gate-control signal or narrow to the first predetermined value to meet the requirement of back-end processing, described the first predetermined value presets according to the requirement of back-end processing.
9. method as claimed in claim 7, also comprises:
Described breath signal and the first threshold voltage or the Second Threshold voltage that set in advance are compared, to export tension index signal or to cross loose index signal,
Wherein, described first threshold voltage is greater than Second Threshold voltage, and,
When described breath signal is greater than described first threshold voltage, output tension index signal, and when described breath signal is less than described Second Threshold voltage, exported loose index signal.
10. method as claimed in claim 7, also comprises:
The alarm ball of holding with a firm grip when patient does not feel well is sent pressure signal;
Change detected pressure signal into differential electric signal;
Described differential electric signal is carried out to differential amplification, take acquisition form as sinusoidal wave alarm signal;
Described alarm signal is postponed to the second time delay to obtain delayed alarm signal, according to the cycle of described alarm signal, determine described the second time delay;
By described alarm signal and the described signal subtraction of delayed alarm;
Described subtracted signal is amplified;
Described subtracted signal and null value are compared, thus the alarm control signal that acquisition form is square-wave signal; And
By the persistent period broadening of the useful signal in described alarm control signal or narrow to the second predetermined value, described the second predetermined value presets according to the time of fire alarming setting in advance.
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| US9486154B2 (en) * | 2014-08-15 | 2016-11-08 | Mediatek Inc. | Device and method for recording physiological signal |
| CN105894767A (en) * | 2015-12-16 | 2016-08-24 | 沈阳东软医疗***有限公司 | Magnetic resonance attachment signal sending method, transmission method, device and system |
| CN106510665A (en) * | 2016-12-08 | 2017-03-22 | 浙江伽奈维医疗科技有限公司 | Wearable remote respiratory gating system for puncture and software design method of wearable remote respiratory gating system |
| CN115429250B (en) * | 2022-11-10 | 2023-04-14 | 北京肿瘤医院(北京大学肿瘤医院) | MRI (magnetic resonance imaging) gating method and system based on multi-channel pressure induction |
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| DE102005013851B4 (en) * | 2005-03-24 | 2014-11-27 | Siemens Aktiengesellschaft | Method for supporting an examination by means of an imaging diagnostic device |
| CN201088589Y (en) * | 2007-02-16 | 2008-07-23 | 高献书 | Digital active breath gate controlling system |
| CN101224105B (en) * | 2008-01-09 | 2011-07-27 | 包头市稀宝博为医疗***有限公司 | Air pressure breath gate controlling system |
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