CN105167807A - Ultrasonic testing method for interior of human body, diagnostic apparatus and transducer - Google Patents
Ultrasonic testing method for interior of human body, diagnostic apparatus and transducer Download PDFInfo
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- CN105167807A CN105167807A CN201510556491.2A CN201510556491A CN105167807A CN 105167807 A CN105167807 A CN 105167807A CN 201510556491 A CN201510556491 A CN 201510556491A CN 105167807 A CN105167807 A CN 105167807A
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Abstract
The invention discloses an ultrasonic testing method for the interior of a human body, a diagnostic apparatus and an transducer. The method comprises the following steps: an internal ultrasonic transducer with the center frequency of 5 MHz to 100 MHz is sent by an ultrasound catheter with the diameter of 0.1 mm to 5 mm to an internal to-be-tested part from a human body natural orifice or a minimally invasive opening; ultrasonic signals are sent to and received from the internal to-be-tested part for 360 degrees; moreover, the internal ultrasonic transducer is withdrawn, and the three-dimensional image of the to-be-tested part is obtained. The diagnostic apparatus comprises the ultrasound catheter with the diameter of 0.1 mm to 5 mm, the internal ultrasonic transducer with the center frequency of 5 MHz to 100 MHz is mounted at the front end of the ultrasound catheter, and the rear end of the ultrasound catheter is connected with a withdrawing/driving device; and the withdrawing/driving device is connected with an electronic imaging system. The transducer comprises an ultrasonic transduction unit composed of a backing layer, a piezoelectric layer and an acoustic matching layer which are connected in sequence and tightly. According to the invention, the ultrasonic transducer is sent to the internal part from the human body natural orifice or the minimally invasive opening, so that little injury can be caused on human body and the imaging resolution is improved.
Description
Technical field
The present invention relates to in-vivo diagnostic instrument, supersonic detection method, diagnostic apparatus and transducer particularly in a kind of body.
Background technology
Ultrasonic examination refers to a kind of noninvasive determination method using hyperacoustic principle to judge the physical characteristic of human body soft tissue, form, structure and fuction.Because ultrasonic device is convenient to mobile, cost is low, and imaging resolution is high, does not have radiation injury to human body, is medically widely used.
Due to the particularity of internal milieu, and the path entering diseased region to be measured in body is very narrow, the diagnostic apparatus using ultra sonic imaging principle so existing is mostly vitro detection, external supersonic detects the ultrasonic signal adopted, because signal wants transdermal, subcutaneous layer of fat and the interface between tissue and tissue, be usually operated in lower operating frequency; The ultrasound wave that frequency is lower, has longer wavelength, thus causes lower image resolution ratio.
Summary of the invention
The present invention is directed to above-mentioned problems of the prior art, supersonic detection method in a kind of body, diagnostic apparatus and transducer are proposed, it utilizes ultrasound catheter that ultrasonic transducer in body is delivered to detected part in body through human body natural's tract or Wicresoft's oral instructions, improves the image resolution ratio of detection.
For solving the problems of the technologies described above, the present invention is achieved through the following technical solutions:
The invention provides the supersonic detection method in a kind of body, it comprises the following steps:
S11: by mid frequency be 5MHz ~ 100MHz body in ultrasonic transducer be that the ultrasound catheter of 0.1mm ~ 5mm sends into detected part in body through human body natural's tract or Wicresoft mouth by diameter;
S12: detected part 360 degree transmitting in described body, reception ultrasonic signal, to know the cross sectional information of detected part in described body;
S13: simultaneously withdraw ultrasonic transducer in body, with know withdraw diverse location place on path multiple described body in the cross sectional information of detected part.
Human body natural's tract of indication of the present invention comprises: urinary tract, reproductive tract, nasal cavity, external auditory meatus and nasolacrimal duct etc., ultrasound catheter enters in-vivo tissue through human body natural's tract or Wicresoft's mouth, can naturally get involved by noinvasive, or only need open very little wound at body surface, namely enter in body through Wicresoft, little to the wound of human body.
Preferably, described step S12 also comprises: focus on described ultrasonic signal, to reduce the sensing angle factor of ultrasonic signal to improve imaging resolution, reduces scattering volume simultaneously and to reduce in body detected part to the scattering strength of ultrasonic signal.
The present invention also provides diasonograph in a kind of body, and it comprises:
Ultrasound catheter, the front end of described ultrasound catheter is provided with ultrasonic transducer in body; The diameter of described ultrasound catheter is 0.1mm ~ 5mm; In described body, the mid frequency of ultrasonic transducer is 5MHz ~ 100MHz, and described ultrasound catheter is used for, through human body natural's tract or Wicresoft's mouth, ultrasonic transducer in described body is sent into detected part in body;
Withdraw/driving device;
And electronic imaging system, it is mounted with the electronic unit rebuilding image; Wherein:
The rear end of described ultrasound catheter withdraws with described/and driving device is connected; Describedly to withdraw/driving device is connected with described electronic imaging system.
In body of the present invention, ultrasonic transducer is microsensor, through human body natural's tract or Wicresoft's mouth, can enter position in body.Describedly to withdraw/ultrasound catheter first delivered to position in body by seal wire by driving device, then slowly withdraw ultrasound catheter and carry out ultrasonic examination, just can see cross-sectional image and 3-D view in a series of body on the display screen of electronic imaging system, assist clinicians is diagnosed pathological changes in body, doctor also can be guided to carry out performing the operation or doing biopsy by its image.
Ultrasonic transducer is sent into position in body through human body natural's tract or Wicresoft's mouth by the present invention, shortens detecting distance, reduces the scattering strength of vivo imaging environment; The decay of the higher unit distance of frequency is larger, and in order to ensure the intensity of signal, frequency and image-forming range are inversely proportional to; Therefore, after detecting distance shortens, can operating frequency be improved, and then improve the resolution of detected image in ultrasonic body, make Clinical detection more accurate.
Preferably, in described body, ultrasonic transducer is simple beam ultrasonic transducer or column type array ultrasound transducer;
When in described body, ultrasonic transducer is simple beam ultrasonic transducer, ultrasonic transducer 360 degree of rotations under the effect of described ultrasound catheter in described body;
When in described body during ultrasonic transducer column type array ultrasound transducer, in described body, ultrasonic transducer comprises the ultrasonic transduction unit of multiple 360 degree of distributions along the face of cylinder.
The design of ultrasound catheter of the present invention mainly contains two kinds: machinery rotating type and electronically phased array formula.Machinery rotating type is the rotation of transducer within the scope of 360 degree by single array element, and launch ultrasound wave, the sound collecting be simultaneously reflected back in cross section in body, passes through image procossing, obtain cross sectional image in body, now withdraw device and will have the function driving transducer to rotate concurrently.The transducer of electronically phased array formula is column type arrangement, without the need to rotating, utilizing the method that electronic delay encourages, the sound collecting be reflected back in cross section in body, obtaining cross sectional image in body after image procossing.
Design corresponding transducer have two kinds with these two kinds, be respectively: single array element planar transducer (as shown in Figure 1) of (1) simple beam, single array element curved transducer (as Fig. 4, shown in 5) of simple beam; (2) many array element ring transducer (as shown in Fig. 6,7,8) of simple beam, the transducer (as shown in Figure 2) of column type array.
Preferably, in described body, ultrasonic transducer is ultrasonic focusing energy transducer in body, can make it have focusing function, also can add focusing unit in the front end of ultrasonic transducer by carrying out improvement to the self structure of ultrasonic transducer.
The sound intensity that medical ultrasound detects is defined as the acoustic energy in unit are, namely equals the ratio of total energy W and beam area:
Obviously, for given acoustical power, reduce beam area S, just can increase sound intensity I, thus improve the signal to noise ratio of image checking.
For given Space Angle d Ω, ultrasonic scattering sound intensity is
to the volume integral in space.Wherein Sv is volume scattering coefficient.Dv is scattering volume unit, is defined as
wherein: r is ultrasonic transducer range-to-go, and c is the velocity of sound, and τ is pulse length;
with
be respectively the sensing angle factor of transmitting and receiving, its principle as shown in Figure 3.
Be not difficult to find out, reduce to point to angle factor
with
to directly improve the resolution of image checking.When ultrasonic transducer has focusing function in body, not only reduce sensing angle factor
with
improve the resolution of image checking; Also reduce scattering volume dv simultaneously, reduce further the scattering strength of internal milieu, thus improve the signal to noise ratio (signal dispersion noise ratio) of image checking, improve the definition of imaging, i.e. the quality of image.
The realization of focus supersonic technology of the present invention can be divided into by the method realized: (1) frame for movement focuses on; (2) electron focusing.Frame for movement focuses on and whole acoustic structure can be divided into again to focus on and sound lens focusing.
Preferably, in described body, ultrasonic transducer comprises close-connected backing layer, piezoelectric layer and acoustic matching layer successively; Wherein:
Described backing layer and/or described piezoelectric layer and/or described acoustic matching layer have mechanical curved surface, it adopts whole acoustic structure focusing technology to realize focusing on, the radius of curvature of described mechanical curved surface is determined according to predetermined focal distance f, (ionospheric) focussing factor K is defined as the ratio of focal distance f and transducer aperture d, that is: the size of K=f/d, aperture d can be determined according to predetermined (ionospheric) focussing factor K and focal distance f.
Preferably, in described body, ultrasonic transducer comprises close-connected backing layer, piezoelectric layer sound, matching layer and acoustic lens successively; Wherein:
Described acoustic lens has mechanical curved surface, it is sound lens focusing, and its radius of curvature is determined according to predetermined focal distance f, and (ionospheric) focussing factor K is defined as the ratio of focal distance f and transducer aperture d, that is: the size of K=f/d, aperture d can be determined according to predetermined (ionospheric) focussing factor K and focal distance f.
Preferably, described acoustic lens is plano-convex or planoconcave lens.
Preferably, in described body, ultrasonic focusing energy transducer comprises multiple ultrasonic transduction unit and multiple delay circuit, and it is electron focusing; Wherein:
Each described ultrasonic transduction unit connects a described delay circuit, and in order to compensation sound wave from focus to the time difference caused by the path difference of each ultrasonic transduction unit, path difference and time difference are determined according to predetermined centre-to-centre spacing deviation; I-th ultrasonic transduction unit is D to the distance of central axis
i, by centre-to-centre spacing deviation D
ithe path difference introduced is:
Time difference T
ifor:
Wherein: i=1,2 ..., 5, f is focal length, and c is the velocity of sound.
Preferably, described multiple ultrasonic transduction unit is arrange with one heart or array arrangement.
Preferably, when described multiple ultrasonic transduction unit is arranged with one heart, it is donut arrangement or Fang Huan arrangement with one heart.
The present invention also provides ultrasonic transducer in a kind of body, and it comprises: ultrasonic transduction unit; It comprises close-connected backing layer, piezoelectric layer and acoustic matching layer successively; Wherein:
The mid frequency of described ultrasonic transduction unit is 5MHz ~ 100MHz;
Described ultrasonic transduction unit is used for converting electrical signals to ultrasonic signal and launches, also for the ultrasonic signal received is converted to the signal of telecommunication.
Preferably, also comprise focus ultrasonic unit, focus on for the ultrasonic signal launched described ultrasonic transduction unit.
Preferably, described focusing unit is specially the mechanical curved surface formed on described backing layer, described piezoelectric layer and described acoustic matching layer.
Preferably, described focusing unit is specially the acoustic lens with mechanical curved surface, the acoustic matching layer compact siro spinning technology of described acoustic lens and described ultrasonic transduction unit.
Preferably, described ultrasonic transduction unit comprises multiple;
Described focusing unit is specially multiple delay circuit, and each described ultrasonic transduction unit connects a described delay circuit.
Compared to prior art, the present invention has the following advantages:
(1) supersonic detection method, diagnostic apparatus and transducer in a kind of body provided by the invention, ultrasonic transducer is sent in body through human body natural's tract or Wicresoft's mouth, smaller to the wound of human body, reduce the distance in ultrasonic transducer and body simultaneously, can operating frequency be improved.Thus improve resolution, and then effectively improve the resolution of detected image and the accuracy of Clinical detection in ultrasonic body;
(2) supersonic detection method, diagnostic apparatus and transducer in body of the present invention, ultrasonic transducer is goed deep into tissue inside, because the penetrance of ultra sonic imaging is stronger, so not only can the surface of tissue visualization inside, its deep lesions position can also be observed;
(3) when the ultrasonic transducer in body of the present invention has focusing function, the scattering strength of internal milieu can be reduced further, improve the signal to noise ratio of image checking further, thus improve the definition of imaging.
Certainly, implement arbitrary product of the present invention might not need to reach above-described all advantages simultaneously.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiments of the present invention are described further:
Fig. 1 be embodiments of the invention 1 body in the schematic diagram of ultrasonic transducer;
Fig. 2 is the schematic diagram of cylindrical array transducer;
Fig. 3 is the volume scattering coefficient of ultrasonic transducer and the schematic diagram of diffuse sound intensity;
Fig. 4 be embodiments of the invention 2 body in the schematic diagram of ultrasonic focusing energy transducer;
Fig. 5 be embodiments of the invention 3 body in the schematic diagram of ultrasonic focusing energy transducer;
Fig. 6 be embodiments of the invention 4 body in the schematic diagram of ultrasonic focusing energy transducer;
Fig. 7 be embodiments of the invention 4 body in ultrasonic focusing energy transducer be donut arrangement left view;
Fig. 8 be embodiments of the invention 4 body in ultrasonic focusing energy transducer be concentric Fang Huan arrange left view;
Fig. 9 be embodiments of the invention 4 body in ultrasonic focusing energy transducer be the left view of array arrangement;
Figure 10 is the schematic diagram of the diasonograph in body of the present invention;
Figure 11 is the flow chart of the supersonic detection method in body of the present invention.
Label declaration: 1-ultrasound catheter, 2-withdraws/driving device, 3-electronic imaging system;
Ultrasonic transducer in 11-body;
111-backing layer, 112-piezoelectric layer, 113-acoustic matching layer, 114-lens.
Detailed description of the invention
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Ultrasonic transducer in body of the present invention, comprising: ultrasonic transduction unit, and it comprises close-connected backing layer, piezoelectric layer and acoustic matching layer successively, and the aperture of ultrasonic transducer is 2mm ~ 3mm; Ultrasonic transduction unit is used for converting electrical signals to ultrasonic signal and launches, also for the ultrasonic signal received is converted to the signal of telecommunication.
Embodiment 1: ultrasonic transducer in the body of employing simple beam technology
Composition graphs 1, ultrasonic transducer in the body of the present embodiment detailed description employing simple beam technology, it comprises the ultrasonic transduction unit be made up of the backing layer 111, piezoelectric layer 112 and the acoustic matching layer 113 that are closely connected successively.Accordingly, the ultrasound catheter driving it to move drives its 360 degree rotations.
In different embodiment, in body, ultrasonic transducer also can be column type array ultrasound transducer, and it comprises the ultrasonic transduction unit of multiple 360 degree of distributions along the face of cylinder, as shown in Figure 2.Correspondingly, drive the ultrasound catheter of motion that it only need be driven to seesaw, do not needed to rotate.
In the body of the present embodiment, ultrasonic transducer enters position in body by ultrasound catheter through human body natural's tract or Wicresoft's mouth, decrease detecting distance, operating frequency can be brought up to 5MHz ~ 100MHz, thus improve transverse direction and axial resolution, improve the resolution of imaging, contribute to Clinical detection.
In order to improve imaging definition further, ultrasonic transducer in body can be set to ultrasonic focusing energy transducer in body, it can reduce to point to angle factor
with
directly improve the resolution of image checking further; It further comprises focusing unit on the original basis, and the ultrasonic signal that focusing unit is used for described ultrasonic transduction unit is launched focuses on, and it can be realized by following two kinds of modes: (1) frame for movement focuses on; (2) electron focusing.Frame for movement focuses on and whole acoustic structure can be divided into again to focus on and sound lens focusing.Below in conjunction with specific embodiment, this is described.
Embodiment 2: ultrasonic focusing energy transducer in the body of employing whole acoustic structure focusing technology
The schematic diagram of ultrasonic focusing energy transducer in the body being illustrated in figure 4 the present embodiment, it comprises close-connected backing layer 111, piezoelectric layer 112 and acoustic matching layer 113 successively, wherein: backing layer 111, piezoelectric layer 112 and acoustic matching layer 113 all have mechanical curved surface, the radius of curvature of three can calculate according to the requirement of focusing acoustic field and set.(ionospheric) focussing factor K is defined as the ratio of focal distance f and transducer aperture d, that is: K=f/d.After given (ionospheric) focussing factor K and focal distance f, just can calculate the size of aperture d.
Embodiment 3: ultrasonic focusing energy transducer in the body of employing sound lens focusing technology
The schematic diagram of ultrasonic focusing energy transducer in the body being illustrated in figure 5 the present embodiment, it comprises close-connected backing layer 111, piezoelectric layer 112, acoustic matching layer 113 and acoustic lens 114 successively, wherein, acoustic lens 4 has mechanical curved surface, and its radius of curvature can calculate according to the requirement of focusing acoustic field and set.
Acoustic lens 114 can be planoconvex lens or planoconcave lens, and it determines according to the velocity of sound of lens material.For the lens material of the velocity of sound lower than the medium velocity of sound, be planoconvex lens, as shown in phantom in Figure 6; For the lens material of the velocity of sound higher than the medium velocity of sound, be planoconcave lens, as shown in solid line in Fig. 6.
Embodiment 4: ultrasonic focusing energy transducer in the body of employing electron focusing technology
The schematic diagram of ultrasonic focusing energy transducer in the body being illustrated in figure 6 the present embodiment, it comprises multiple ultrasonic transduction unit and multiple delay circuit T, the corresponding delay circuit T of each ultrasonic transduction unit,
The present embodiment is for five concentric side's ring transducing unit, and its left view as shown in Figure 7, is denoted as e1 ... e5, the time that sound wave F point from free found field arrives each ultrasonic transduction unit is different.Therefore, total Received signal strength is the superposition of the signal of out of phase, and output signal can not be maximum.Output termination delay circuit of each ultrasonic transduction unit, carrys out compensation sound wave from F point to the time difference caused by the path difference of each ultrasonic transduction unit.I-th ultrasonic transduction unit is D to the distance of central axis
i, then by centre-to-centre spacing deviation D
ithe path difference introduced is:
Time difference T
ifor:
In formula, i=1,2 ..., 5, f is focal length, and c is the velocity of sound.As given D
i, by regulating the time difference T of delay circuit
i, can focus f, reaches variable focal length focus ultrasonic.
In different embodiment, multiple ultrasonic transduction unit also can be that concentric Fang Huan arranges, and its left view as shown in Figure 8; Also can be array arrangement, its left view as shown in Figure 9.In above-described embodiment, the material of piezoelectric layer 112 can be piezoceramic material, piezoelectric thick material, piezoelectric film material, piezo-electric ceramic composite material or piezoelectric monocrystalline composite material; In body, ultrasonic focusing energy transducer can be PMUT or CMUT.
Embodiment 5: diasonograph in body
As shown in Figure 10, for the structural representation of diasonograph in the body of the present embodiment, it comprises ultrasound catheter 1, withdraw/driving device 2 and electronic imaging system 3, the front end of ultrasound catheter 1 is provided with ultrasonic transducer in body, rear end connection withdraws/driving device 2, withdraw/driving device 2 is connected with electronic imaging system 3, the electronic unit rebuilding image is mounted with in electronic imaging system 3, according to cross-sectional image and 3-D view in the ultrasonic signal rebuilding body received, thus judge pathological changes in body according to image.Wherein: ultrasonic transducer in the body of ultrasonic transducer described by any one in such as embodiment 1-4 in body, the aperture of ultrasonic transducer is millimeter magnitude herein, can enter position in body through human body natural's tract or Wicresoft's mouth.
Human body natural's tract comprises: urinary tract, reproductive tract, nasal cavity, external auditory meatus and nasolacrimal duct etc., different in-vivo tissues can be observed through different human body natural's tracts, as: can per urethra, diasonograph in body is sent to prostatic, check the pathological changes of detected part, obtain intraprostatic cross sectional image; Also can per urethra, diasonograph in body is sent to bladder position, checks the pathological changes of bladder detected part; Still through uterus, diasonograph in body can be sent to diseased region to be measured in fallopian tube, obtain intratubal cross sectional image.
Embodiment 6:
Be as shown in figure 11 the present embodiment body in the flow chart of supersonic detection method, it comprises the following steps:
S11: by mid frequency be 5MHz ~ 100MHz body in ultrasonic transducer be that the ultrasound catheter of 0.1mm ~ 5mm sends into detected part in body through human body natural's tract or Wicresoft mouth by diameter;
S12: detected part 360 degree transmitting in body, reception ultrasonic signal, to know the cross sectional information of detected part in body;
S13: simultaneously withdraw ultrasonic transducer in body, with know withdraw diverse location place on path multiple bodies in the cross sectional information of detected part.
In preferred embodiment, step S12 also comprises: focus on the ultrasonic signal launched, imaging resolution is improved with the sensing angle factor reducing ultrasonic signal, reduce scattering volume simultaneously and to reduce in body detected part to the scattering strength of ultrasonic signal, further raising imaging resolution, and increase ultrasound detection scope.
Disclosed herein is only the preferred embodiments of the present invention, and this description is chosen and specifically described these embodiments, and being to explain principle of the present invention and practical application better, is not limitation of the invention.The modifications and variations that any those skilled in the art do within the scope of description, all should drop in scope that the present invention protects.
Claims (16)
1. the supersonic detection method in body, is characterized in that, comprises the following steps:
S11: by frequency be 5MHz ~ 100MHz body in ultrasonic transducer be that the ultrasound catheter of 0.1mm ~ 5mm sends into detected part in body through human body natural's tract or Wicresoft mouth by diameter;
S12: detected part 360 degree transmitting in described body, reception ultrasonic signal, to know the cross sectional information of detected part in described body;
S13: simultaneously withdraw ultrasonic transducer in body, with know withdraw diverse location place on path multiple described body in the cross sectional information of detected part, thus obtain the 3-D view of detected part.
2. the supersonic detection method in body according to claim 1, it is characterized in that, described step S12 also comprises: focus on described ultrasonic signal, improve imaging resolution with the sensing angle factor reducing ultrasonic signal, reduce scattering volume simultaneously and to reduce in body detected part to the scattering strength of ultrasonic signal.
3. a diasonograph in body, is characterized in that, comprising:
Ultrasound catheter, the front end of described ultrasound catheter is provided with ultrasonic transducer in body, and the diameter of described ultrasound catheter is 0.1mm ~ 5mm; In described body, the mid frequency of ultrasonic transducer is 5MHz ~ 100MHz, and described ultrasound catheter is used for, through human body natural's tract or Wicresoft's mouth, ultrasonic transducer in described body is sent into detected part in body;
Withdraw/driving device;
And electronic imaging system, it is mounted with the electronic unit rebuilding image; Wherein:
The rear end of described ultrasound catheter withdraws with described/and driving device is connected; Describedly to withdraw/driving device is connected with described electronic imaging system, can obtain the 3-D view of detected part.
4. diasonograph in body according to claim 3, is characterized in that, in described body, ultrasonic transducer is simple beam ultrasonic transducer or column type array ultrasound transducer;
When in described body, ultrasonic transducer is simple beam ultrasonic transducer, ultrasonic transducer 360 degree of rotations under the effect of described ultrasound catheter in described body;
When in described body during ultrasonic transducer column type array ultrasound transducer, in described body, ultrasonic transducer comprises the ultrasonic transduction unit of multiple 360 degree of distributions along the face of cylinder.
5. diasonograph in body according to claim 3, is characterized in that, in described body, ultrasonic transducer is ultrasonic focusing energy transducer in body.
6. diasonograph in body according to claim 5, is characterized in that, in described body, ultrasonic transducer comprises close-connected backing layer, piezoelectric layer and acoustic matching layer successively; Wherein:
Described backing layer and/or described piezoelectric layer and/or described acoustic matching layer have mechanical curved surface, the radius of curvature of described mechanical curved surface is determined according to predetermined focal distance f, (ionospheric) focussing factor K is defined as the ratio of focal distance f and transducer aperture d, that is: the size of K=f/d, aperture d can be determined according to predetermined (ionospheric) focussing factor K and focal distance f.
7. diasonograph in body according to claim 5, is characterized in that, in described body, ultrasonic transducer comprises close-connected backing layer, piezoelectric layer sound, matching layer and acoustic lens successively; Wherein:
Described acoustic lens has mechanical curved surface, and its radius of curvature is determined according to predetermined focal distance f, and (ionospheric) focussing factor K is defined as the ratio of focal distance f and transducer aperture d, that is: K=f/d, and the size of aperture d can be determined according to predetermined (ionospheric) focussing factor K and focal distance f.
8. diasonograph in body according to claim 7, is characterized in that, described acoustic lens is plano-convex or planoconcave lens.
9. diasonograph in body according to claim 5, is characterized in that, in described body, ultrasonic focusing energy transducer comprises multiple ultrasonic transduction unit and multiple delay circuit; Wherein:
Each described ultrasonic transduction unit connects a described delay circuit, and in order to compensation sound wave from focus to the time difference caused by the path difference of each ultrasonic transduction unit, path difference and time difference are determined according to predetermined centre-to-centre spacing deviation; I-th ultrasonic transduction unit is D to the distance of central axis
i, by centre-to-centre spacing deviation D
ithe path difference introduced is:
Time difference T
ifor:
Wherein: i=1,2 ..., 5, f is focal length, and c is the velocity of sound.
10. diasonograph in body according to claim 9, is characterized in that, described multiple ultrasonic transduction unit is arrange with one heart or array arrangement.
Diasonograph in 11. bodies according to claim 10, is characterized in that, when described multiple ultrasonic transduction unit is arranged with one heart, it is donut arrangement or Fang Huan arrangement with one heart.
Ultrasonic transducer in 12. 1 kinds of bodies, is characterized in that, comprising: ultrasonic transduction unit; It comprises close-connected backing layer, piezoelectric layer and acoustic matching layer successively; Wherein:
The mid frequency of described ultrasonic transduction unit is 5MHz ~ 100MHz;
Described ultrasonic transduction unit is used for converting electrical signals to ultrasonic signal and launches, also for the ultrasonic signal received is converted to the signal of telecommunication.
Ultrasonic transducer in 13. bodies according to claim 12, is characterized in that, also comprises focus ultrasonic unit, focuses on for the ultrasonic signal launched described ultrasonic transduction unit.
Ultrasonic transducer in 14. bodies according to claim 13, is characterized in that, described focusing unit is specially the mechanical curved surface formed on described backing layer, described piezoelectric layer and described acoustic matching layer.
Ultrasonic transducer in 15. bodies according to claim 13, is characterized in that, described focusing unit is specially the acoustic lens with mechanical curved surface, the acoustic matching layer compact siro spinning technology of described acoustic lens and described ultrasonic transduction unit.
Ultrasonic transducer in 16. bodies according to claim 13, is characterized in that, described ultrasonic transduction unit comprises multiple;
Described focusing unit is specially multiple delay circuit, and each described ultrasonic transduction unit connects a described delay circuit.
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| CN201510556491.2A CN105167807A (en) | 2015-09-02 | 2015-09-02 | Ultrasonic testing method for interior of human body, diagnostic apparatus and transducer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109381806A (en) * | 2017-08-14 | 2019-02-26 | 重庆海扶医疗科技股份有限公司 | Ultrasonic image-forming system and method, supersonic therapeutic system |
| CN114076797A (en) * | 2021-11-05 | 2022-02-22 | 清华大学 | Internal damage detection method and device |
-
2015
- 2015-09-02 CN CN201510556491.2A patent/CN105167807A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109381806A (en) * | 2017-08-14 | 2019-02-26 | 重庆海扶医疗科技股份有限公司 | Ultrasonic image-forming system and method, supersonic therapeutic system |
| CN114076797A (en) * | 2021-11-05 | 2022-02-22 | 清华大学 | Internal damage detection method and device |
| CN114076797B (en) * | 2021-11-05 | 2023-04-07 | 清华大学 | Internal damage detection method and device |
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Application publication date: 20151223 |