CN103340654A - Acoustic impedance measuring probe - Google Patents
Acoustic impedance measuring probe Download PDFInfo
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- CN103340654A CN103340654A CN2013101680686A CN201310168068A CN103340654A CN 103340654 A CN103340654 A CN 103340654A CN 2013101680686 A CN2013101680686 A CN 2013101680686A CN 201310168068 A CN201310168068 A CN 201310168068A CN 103340654 A CN103340654 A CN 103340654A
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Abstract
The invention discloses an acoustic impedance measuring probe which comprises a transmitting ultrasonic transducer (1), a receiving ultrasonic transducer (2), a measuring circuit, a base (6) and a fixing support (7). The measuring circuit comprises a central processing unit, a transmitting circuit and a receiving circuit, wherein the transmitting circuit is used for controlling the transmitting ultrasonic transducer (1) to transmit a needed signal, and the receiving circuit is used for processing a transmitting echo signal received by the receiving ultrasonic transducer (2). The base (6) is composed of triangular prismoids. The transmitting ultrasonic transducer (1) and the receiving ultrasonic transducer (2) are fixed on two oblique planes of the base (6) respectively. The measuring circuit is used for controlling the transmission and the receiving of the signal and processing the received echo signal to obtain a ratio between excitation voltage and recycling voltage, and a biological tissue acoustic impedance figure is finally obtained. The study of acoustic impedance on medical treatment application is provided with assistance.
Description
Technical field
The present invention relates to the ultrasound examination field, be specifically related to a kind of acoustic impedance measurement probe and measuring method.
Background technology
The research of biological tissue's surface ultrasonic characteristic is for judging that the global tissue situation is significant.In ultrasonic diagnosis, the surface characteristic of tested organ can be determined by ultrasound echo signal.The sound parameter of describing the dieletric reflection characteristic mainly is specific acoustic impedance Z.The difference of the acoustic impedance Z of biological tissue is reflecting the difference of tissue characteristics, so to the quantitative study of acoustic impedance, can judge the characteristic of biological tissue.
The ultrasonic probe overwhelming majority all is for launching single-frequency or double frequency physical therapy ultrasonic probe on the market, it is few to be used for measuring probe, more very be used for the acoustic impedance measurement probe, measurement to acoustic impedance is all carried out in time domain usually, namely measure the velocity of sound, Media density respectively, thereby obtain the Z value by its product, this method can obtain the exact value of medium Z, but generally is difficult to use in live body and on-line measurement.
Summary of the invention
The object of the present invention is to provide a kind of acoustic impedance measurement probe and measuring method, it can realize live body and on-line measurement.
A kind of acoustic impedance measurement device provided by the invention comprises measuring probe and measuring circuit; Described measuring probe comprises emission ultrasonic transducer 1 and receives ultrasonic transducer 1, the two is separately fixed at by the bottom surface is on two right-angle side inclined-planes of the italic pedestal that constitutes of the rhizoma sparganic solid cylinder of equilateral right angled triangle, the long 10-13mm in inclined-plane, the wide 10mm that is not less than, angle is made of broadside; The described frequency range 0.8-1.5MHz that transmits and receives ultrasonic transducer, distribution capacity 2000pf;
Described measuring circuit comprises that central processing unit 21, central processing unit 21 gauge tap circuit 20 send square-wave signal, and this signal drives emission ultrasonic transducer 1 through waveform shaping circuit 22, power amplification circuit 23 and holding circuit 24; Central processing unit 21 gauge tap circuit 26 receive the reflected signal of ultrasonic transducer 2, and this signal input amplification filtering circuit 27 again through A/D change-over circuit 28, is sent central processing unit 21 back to after becoming digital signal.
Measuring probe contact by couplant and biological tissue surface, connects measuring circuit, and this moment, the device lamp that transmits was bright, and expression is launched ultrasonic transducer 11 and normally launched signal on request; The lamp that transmits goes out, and it is bright to receive signal lights, and the expression emission stops, and normally receives biological tissue's return reflection surface signal, and the treated and related operation of this signal finally draws the acoustic impedance figure.
Description of drawings
Fig. 1 is acoustic impedance measurement probe profile;
Fig. 2 is that measuring circuit is controlled the circuit diagram that transmits;
Fig. 3 is that measuring circuit is in order to receive and the processing signals circuit diagram;
Fig. 4 is the measuring method flow chart.
The specific embodiment
With reference to figure 1, the acoustic impedance measurement probe comprises emission ultrasonic transducer 1 and receives ultrasonic transducer 2, and probe fixed support 7; Measuring circuit comprises in order to control emission ultrasonic transducer 1 sends the radiating circuit part of desired signal and the receiving circuit of the emission echo signal that processing receiving transducer 2 receives.Whole probe is in order to draw final acoustic impedance Z figure.
Emission ultrasonic transducer 1 and reception ultrasonic transducer 2, the two is separately fixed at by the bottom surface is on two right-angle side inclined-planes of the italic pedestal 6 that constitutes of the rhizoma sparganic solid cylinder of equilateral right angled triangle, for convenience of description, the corresponding triangular prism bus in right angle is designated as the TL limit, two corresponding buses of acute angle are designated as LL, LR respectively.Inclined-plane between TL limit and the LL limit is designated as inclined-plane 3, and the inclined-plane between TL limit and the LR limit is designated as inclined-plane 4, and the face between LL limit and the LR limit is designated as bottom surface 8.The described design frequency scope that transmits and receives ultrasonic transducer is 0.8-1.5MHz, according to acoustics and Physiological Anatomy theory, is more suitable for penetrating in acoustic energy the skin surface of human body in this frequency range; The design distribution capacity 2000pf of transducer makes the effective impedance of the easier acquisition of drive circuit and power match.After design frequency is fixing with the design distribution capacity, according to theoretical piezoelectric processing Theory two transducers 1,2 diameter between 20-23mm, so the design long 20-23mm in inclined-plane, the wide 20mm that is not less than, the broadside of TL limit inclined surface.According to specific requirement, after theory is calculated, can obtain two transducers in italic pedestal 6 ramps 3,4 concrete position location parameter, designing two transducers 1,2 can move on the inclined-plane 3,4 of italic pedestal 6, it is gluing fixing to carry out acoustical coupling according to the experiment situation at last, finishes the overall structure typing of probe.One diameter is arranged is the straight-through bottom surfaces 8 of through hole 9 of 6mm to 5mm place, distance L L limit on italic pedestal inclined-plane 3, through hole 8 is directly linked outside the fixed support 7 by soft body catheter, is responsible for finishing to injecting the used emulsifiable paste medicine for the treatment of between ultrasonic transducer and the biological tissue surface 5.One diameter is arranged is the straight-through bottom surfaces 8 of through hole 10 of 3mm to 5mm place, distance L L limit on italic pedestal inclined-plane 4, through hole 10 in the bottom surface 8 the port of export fix an anticorrosion high sensitivity temperature transducer 11, temperature resolution reaches 0.05 degree centigrade, holding wire links to each other with the signal detection control circuit by outside the through hole 10 straight-through fixed supports 7.Be responsible for finishing detecting and inject the real time temperature for the treatment of the emulsifiable paste medicine between ultrasonic transducer and the biological tissue surface 5.The direct single face opening column type administration pond 12 close with italic bottom surface 8 areas, adhesion one bottom surface on italic bottom surface 8.Administration pond 12 selects conductive rubber to make, 12 closed ends and italic bottom surface 8 join, simultaneously corresponding through hole 9 places open a diameter 6mm hole and link to each other with through hole, be responsible for the importing of medicine, 12 open ends are to biological tissue surface 5, around thin film heating carbon film 13, area is identical with the lateral area in column type administration pond 12 on the cylindrical wall in column type administration pond 12, and the medicine of being responsible for finishing in the administration pond 12 heats.
With reference to figure 2, identical with the reflected back signal frequency because transmitting, do not disturb mutually between them for guaranteeing, need to control the time that transmits and receives signal, namely by central processing unit 21 gauge tap circuit 20 and 26 time-sharing works.Send square-wave signal at the appointed time by central processing unit 21 gauge tap circuit 20, this signal is through waveform shaping circuit 22, gives amplification at 5-20 adjustable power amplification circuit 23 doubly, behind impedance circuit 24, gives emission ultrasonic transducer 1 again.
With reference to figure 3, after reception ultrasonic transducer 2 receives signal, earlier through impedance matching circuit 25, be input to again in the amplification filtering circuit 27, purpose one is to amplify to receive signal, the 2nd, remove unnecessary noise signal, again through A/D change-over circuit 28, send back in the central processing unit 21 after this analogue signal become digital signal.Central processing unit carries out digital correlation reclaiming signal and transmitting, and obtains the ratio of driving voltage and recovery voltage, finally obtains the acoustic impedance figure.
With reference to figure 4, device for opening, program is carried out initialization, and central processing unit 21 cuts out on-off circuit 20, and ultrasonic transducer 1 stops to launch ultrasound wave, closes on-off circuit 26, and ultrasonic transducer 2 stops to receive ultrasound wave; Program internal timer timer zero clearing; When detecting when instruction of transmitting, central processing unit 21 is opened on-off circuit 20, behind ultrasonic transducer 1 one section ultrasonic pulse of emission (pulse width is obtained by Theoretical Calculation), close on-off circuit 20, program internal timer timer timer picks up counting simultaneously, when timing time reached investigation depth and wants seeking time, this relation was determined by formula (1)
t＝2h/v (1)
H is the degree of depth, and v is that the spread speed of sound in skin is about 1530m/s.
Open on-off circuit 26, ultrasonic transducer 2 begins to receive ultrasound wave, simultaneously program internal timer timer zero clearing; This process is equivalent to add a window function to signal detection.When detect receive to write in reply number after, close on-off circuit 26, by central processing unit 21 processing signals, the relation according to emission hyperacoustic pulse width, intensity and the hyperacoustic intensity of reception draws final acoustic impedance figure.
Claims (7)
1. an acoustic impedance measurement probe comprises emission ultrasonic transducer (1), receives ultrasonic transducer (2), measuring circuit, pedestal (6) and fixed support (7); It is characterized in that: described measuring circuit comprises central processing unit, sends the radiating circuit of desired signal and the receiving circuit of the emission echo signal that processing reception ultrasonic transducer (2) receives in order to control emission ultrasonic transducer (1); Pedestal (6) is made of tri-prismoid; Emission ultrasonic transducer (1) and reception ultrasonic transducer (2) are separately fixed on first inclined-plane (3) and second inclined-plane (4) of pedestal (6).
2. a kind of acoustic impedance measurement probe according to claim 1 is characterized in that: pedestal (6) is that the tri-prismoid of equilateral right angled triangle constitutes by the bottom surface; The corresponding triangular prism bus in right angle is designated as the TL limit, and two corresponding buses of acute angle are designated as the LL limit respectively, the LR limit; Inclined-plane between TL limit and the LL limit is first inclined-plane (3), and the inclined-plane between TL limit and the LR limit is second inclined-plane (4), and the face between LL limit and the LR limit is acting surface (8); Wherein first inclined-plane (3) are provided with first through hole (9), and first through hole (9) leads directly to acting surface (8); First through hole (9) is connected with conduit.
3. a kind of acoustic impedance measurement according to claim 2 is popped one's head in, and it is characterized in that: wherein second inclined-plane (4) are provided with second through hole (10), and second through hole (10) leads directly to acting surface (8); Second through hole (10) is fixed a temperature transducer (11) at the port of export of acting surface (8), and holding wire links to each other with the signal detection control circuit by outside the through hole 10 straight-through fixed supports (7).
4. a kind of acoustic impedance measurement according to claim 1 is popped one's head in, and it is characterized in that: described radiating circuit comprises emission switch circuit (20), waveform shaping circuit (22), power amplification circuit (23) and holding circuit (24); Described receiving circuit comprises receiving key circuit (26), amplification filtering circuit (27) and A/D change-over circuit (28); Central processing unit (21) control emission switch circuit (20) is sent square-wave signal, and this square-wave signal drives emission ultrasonic transducer (1) through waveform shaping circuit (22), power amplification circuit (23) and holding circuit (24); Central processing unit (21) is also controlled receiving key circuit (26), receive the reflected signal of ultrasonic transducer (2), this reflected signal input amplification filtering circuit (27) again through A/D change-over circuit (28), is sent central processing unit (21) back to after becoming digital signal; Central processing unit (21) calculates the acoustic impedance figure.
5. a kind of acoustic impedance measurement probe according to claim 1 is characterized in that: the frequency range 0.8-1.5MHz of described emission ultrasonic transducer (1), reception ultrasonic transducer (2), distribution capacity 2000pf.
6. a kind of acoustic impedance measurement according to claim 1 is popped one's head in, and it is characterized in that: the diameter of described emission ultrasonic transducer (1), reception ultrasonic transducer (2) is 20-23mm.
7. a kind of acoustic impedance measurement probe according to claim 1 is characterized in that: connect a column type administration pond (12) at acting surface (8); Described administration pond (12) is made by conductive rubber; Described administration pond (12) closed end and acting surface (8) join, corresponding first through hole of while (9) is located out a medicine outlet hole and is linked to each other with first through hole (9), be used for the importing of medicine, described administration pond (12) open end is to biological tissue surface (5), on the cylinder side wall in described administration pond (12), heat carbon film (13) around thin film, its area is identical with the lateral area in described administration pond (12), is used for the medicine in described administration pond (12) is heated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310168068.6A CN103340654B (en) | 2013-05-08 | 2013-05-08 | Acoustic impedance measurement is popped one's head in |
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| CN201310168068.6A CN103340654B (en) | 2013-05-08 | 2013-05-08 | Acoustic impedance measurement is popped one's head in |
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| CN103340654A true CN103340654A (en) | 2013-10-09 |
| CN103340654B CN103340654B (en) | 2015-09-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107554817A (en) * | 2017-07-11 | 2018-01-09 | 西北工业大学 | The compound formation method of satellite |
| CN107635471A (en) * | 2015-05-20 | 2018-01-26 | 西江大学校产学协力团 | For the apparatus and method for the performance for assessing ultrasonic transducer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1115138A (en) * | 1995-07-14 | 1996-01-17 | 陈国经 | Universal miniature ultrasonic transceiver module |
| CN1458808A (en) * | 2002-05-15 | 2003-11-26 | 松下电器产业株式会社 | Sound matching part, supersonic transducer, supersonic flow meter and its producing method |
| KR20060054468A (en) * | 2004-08-04 | 2006-05-22 | 미쓰비시덴키 가부시키가이샤 | Sensor for transmitting and receiving ultrasonic wave radiation, position detector, and dehumidifier |
-
2013
- 2013-05-08 CN CN201310168068.6A patent/CN103340654B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1115138A (en) * | 1995-07-14 | 1996-01-17 | 陈国经 | Universal miniature ultrasonic transceiver module |
| CN1458808A (en) * | 2002-05-15 | 2003-11-26 | 松下电器产业株式会社 | Sound matching part, supersonic transducer, supersonic flow meter and its producing method |
| KR20060054468A (en) * | 2004-08-04 | 2006-05-22 | 미쓰비시덴키 가부시키가이샤 | Sensor for transmitting and receiving ultrasonic wave radiation, position detector, and dehumidifier |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107635471A (en) * | 2015-05-20 | 2018-01-26 | 西江大学校产学协力团 | For the apparatus and method for the performance for assessing ultrasonic transducer |
| CN107554817A (en) * | 2017-07-11 | 2018-01-09 | 西北工业大学 | The compound formation method of satellite |
| CN107554817B (en) * | 2017-07-11 | 2020-02-14 | 西北工业大学 | Satellite composite formation method |
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| CN103340654B (en) | 2015-09-30 |
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Effective date of registration: 20160927 Address after: 100041, Beijing, Shijingshan District Galaxy South Road, purple imperial Hospital No. 2, building 2, 1809 Patentee after: Micro motion interconnect (Beijing) Technology Co., Ltd. Address before: 030006 Taiyuan, Xiaodian District, Shanxi City Road, No. 92 Patentee before: Shanxi Univeristy |
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Effective date of registration: 20211115 Address after: 030006 No. 92, Wucheng Road, Xiaodian District, Taiyuan City, Shanxi Province Patentee after: Chen Baoming Address before: 1809, building 2, Ziyu international Yard 2, Yinhe South Road, Shijingshan District, Beijing 100041 Patentee before: Micro interconnection (Beijing) Technology Co., Ltd |
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Effective date of registration: 20220210 Address after: 1507-2, 12 / F, building 1, yard 32, Xizhimen North Street, Haidian District, Beijing 100089 Patentee after: Yuanxu Technology (Beijing) Co.,Ltd. Address before: 030006, No. 92, Hollywood Road, Xiaodian District, Shanxi, Taiyuan Patentee before: Chen Baoming |