CN104483384B - Magnetic-acoustic multi-field coupling imaging experiment device - Google Patents
Magnetic-acoustic multi-field coupling imaging experiment device Download PDFInfo
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- CN104483384B CN104483384B CN201410773975.8A CN201410773975A CN104483384B CN 104483384 B CN104483384 B CN 104483384B CN 201410773975 A CN201410773975 A CN 201410773975A CN 104483384 B CN104483384 B CN 104483384B
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Abstract
The invention relates to a magnetic-acoustic multi-field coupling imaging experiment device. The magnetic-acoustic multi-field coupling imaging experiment device is characterized in that an ultrasonic module is an ultrasonic receiving device and also is an ultrasonic emitting device; an electronic module comprises a coil (5), an exciting circuit, a signal processing and collecting circuit and a motion control system and is used for collecting coil excitation and weak electrical signals; a mechanical module comprises a shelving table (7), an ultrasound screening box (8), a rotating gear (9) and a sound absorption film; a gear on the circumference of the shelving table (7) is meshed with the rotating gear (9) to drive the shelving table (7) to rotate; an exciting coil and a receiving coil are arranged in the ultrasound screening box (8); the sound absorption film clings to the inner wall surface of a screening type water tank (1); ultrasonic arrays of the mechanical module and the ultrasonic module are sealed in the screening type water tank (1), ultrasonic array collecting circuits of the electronic module and the ultrasonic module are fixed on the upper wall of the inner wall surface of the screening type water tank (1); the ultrasonic arrays and measured samples are coupled by virtue of a coupling agent in the screening type water tank.
Description
Technical field
The present invention relates to a kind of multi- scenarios method imaging device, more particularly to a kind of magnetic-sound multi- scenarios method imaging experiment device.
Background technology
The sensitivity of traditional Review of Electrical Impedance Tomography and spatial resolution be not high, is to solve this problem, there has been proposed
Various new imagings, magnetosonic Electrical imaging and magnetosonic imaging be exactly two of which each other anti-pattern with applications well prospect
Medical imaging procedure.The principle of magnetosonic Electrical imaging be by a branch of ultrasound wave inject imaging body, the local ion in imaging body with
The propagation of ultrasound wave and vibrate, the ion of vibration is subject to Lorentz force to act on and cause separation of charge in the presence of magnetostatic field,
And then form the electric field of local in vivo in imaging, by the receiving electrode that is placed with imaging body or non-contacting with imaging body connect
Receive Coil Detector signal of telecommunication reconstruct electrical impedance images.Magnetosonic imaging is then the anti-pattern of magnetosonic Electrical imaging, and its image-forming principle is right
Conductive imaging body applies magnetostatic field and pulsed magnetic field, because the imaging that acts on of Lorentz force produces in vivo vibration, by ultrasound
Probe detection ultrasonic signal reconstruct electrical impedance images.Two kinds of imaging methods all have in terms of sensitivity and spatial resolution is improved
Potential advantage, but there is complex structure in current experimental system, the problems such as the signal noise of detection is big.
The content of the invention
The purpose of the present invention is to overcome existing experimental system to there is complex structure, the problems such as detection signal noise is big, is proposed
A kind of magnetic-acoustic electro-conductibility imaging experimental provision.The present invention can not only carry out magnetosonic experiment but also can carry out magnetosonic electricity experiment, and
Experimental system structure can be simplified by the device, while improving the signal to noise ratio of signal.
The invention mainly comprises ultrasonic module, electronics module and mechanical module.Described ultrasonic module is mainly used in surpassing
The excitation of sound and the reception of ultrasonic signal, described electronics module is mainly used in the collection of electromagnetic excitation and ultra-weak electronic signal,
The function of described mechanical module is to realize the scanning of sample.
Described ultrasonic module mainly includes supersonic array, circular framework and ultrasound control Acquisition Circuit.Supersonic array with
Ultrasound controls Acquisition Circuit electrical connection, and ultrasound controls the transmitting of interior each ultrasound element of Acquisition Circuit control supersonic array and connects
Receive, supersonic array is evenly distributed on circular framework.Supersonic array both can also may be used as the ultrasonic reception device of magnetosonic imaging
Using the ultrasonic transmitter as magnetosonic Electrical imaging.
Described electronics module includes producing magnet system, coil, exciting circuit, signal processing and the collection of magnetostatic field
Circuit and kinetic control system.The magnet system of described generation magnetostatic field is superconducting magnet, permanent magnet or electromagnet, positioned at screen
The outside of formula tank is covered, the magnet system purpose of described generation magnetostatic field is that uniform magnetic field is produced in sample, is produced
The magnetostatic field direction that the magnet system of magnetostatic field is produced is parallel with the magnetic direction of the pulsed magnetic field that excitation coil is produced, while producing
The magnet system of raw magnetostatic field produce the effective radius of magnetostatic field be more preferably less than sample to the straight line between supersonic array away from
From that is, supersonic array is located at outside the magnetostatic field effective range of the magnet system generation for producing magnetostatic field；Described coil both can be with
Be excitation coil can also be receiving coil, coil connects as during excitation coil with exciting circuit；When coil is used as reception line
It is connected with Acquisition Circuit with signal processing during circle；Excitation coil is connected the driving source as magnetosonic imaging with exciting circuit, receives
Coil is connected the detecting system as magnetosonic Electrical imaging with signal processing, Acquisition Circuit, and kinetic control system realizes sample
Rotation.
Described mechanical module is the core of experimental provision of the present invention, and the function of mechanical module is to realize sweeping for sample
Retouch, and reduce the interference of electromagnetic interference and ultrasonic signal, therefore the design of mechanical module can ensure that the signal to noise ratio of detection signal.
Described mechanical module includes the articles holding table with gear, ultrasonic shielding box, swing pinion and sound absorption thin film.The gear of articles holding table
With swing pinion occlusion, swing pinion drive articles holding table rotation.Ultrasonic shielding box is located at the lower section of articles holding table, excitation coil and connects
Take-up circle is placed in ultrasonic shielding box.Described sound absorption thin film is close on the internal face of protected type tank.Described machinery
In the protected type tank with electro-magnetic screen function, described protected type tank is also simultaneously experimental water groove to module sealing,
The supersonic array of mechanical module and ultrasonic module is placed with protected type tank.The ultrasound control of electronics module and ultrasonic module
Acquisition Circuit is fixed on inboard wall of cistern face, and ensures that ultrasound control Acquisition Circuit can not be located in coupling liquid.Supersonic array and
Coupled by couplant between sample, couplant is insulating oil or deionized water, couplant is placed on protected type tank
It is interior.
The receiving coil and excitation coil of the electronics module occurs in pairs, namely excitation coil can constitute excitation
Coil pair, receiving coil can also constitute excitation coil pair.The center overlapping of axles of excitation coil pair and receiving coil pair, excitation line
Enclose to two excitation coils it is upper and lower positioned at sample respectively, symmetrically placed, the conspicuous nurse of excitation coil composition arranged up and down
Hertz coil.Two receiving coils of receiving coil pair can also be symmetrically placed in the upper and lower of sample, or be only positioned at by
Above test sample product or below.Two receiving coils of receiving coil pair can be parallel way or series system.To improve
Signal to noise ratio, the coil below sample is placed in the ultrasonic shielding box of mechanical module, evacuation in ultrasonic shielding box.It is super
Acoustic shielding box top is articles holding table.Described articles holding table is circular, and a fixation is passed through between ultrasonic shielding box and articles holding table
Pillar connects, and acoustic pad of the radius slightly larger than articles holding table is placed in the top of articles holding table, and isolation supersonic frequency is in 200KHz-
Ultrasonic signal in the range of 100MHz.
In the sample in plane and articles holding table that supersonic array is located is generally aligned in the same plane.Supersonic array can be phase
Control battle array ultrasonic probe array, or single array element array.The ultrasonic probe of supersonic array can also be by transmitting ultrasonic probe
The double array element ultrasonic probes independently constituted with reception ultrasonic probe, it is independent when supersonic array is double array element ultrasonic probes
Reception array element and independent transmitting array element it is coaxial and receive array element and be launched array element and surround, the front for receiving array element is circular
, the front for launching array element is annular, and the front for receiving array element and transmitting array element is located in same facial plane, and launches battle array
The front of unit and reception array element constitutes a circular front just.Receiving array element and transmitting array element can control respectively.To avoid
The interference that the protected type tank acoustical signal of itself is imaged to magnetosonic, posts one layer and is directed on six inwalls of protected type tank
The flexible sound absorption thin film of 200KHz-10MHz frequency ranges, prevents the interference of the acoustical signal of protected type flume wall generation, while anti-
The acoustical signal that only sample is produced runs into the reflection of protected type flume wall and measurement signal is impacted.
Together with swing pinion passes through engaged gears with articles holding table, gear rotation is rotated by kinetic control system,
Swing pinion drives articles holding table rotation, rotates sample.Described supersonic array is uniformly distributed on circular framework.Ultrasound
Array quantity determines the scanning accuracy to sample with the anglec of rotation of gear, such as in the circular framework of a diameter of 8cm
On supersonic array quantity more than 32, when to realize 360 ° of intervals, 1 ° of scanning, the anglec of rotation of swing pinion is about 1
Degree, the anglec of rotation is 12 ° can then realize to sample 360 ° of scannings.
The present invention is easy to use and portable, and the absorption with ultrasound and sound insulation are acted on, and electromagnetic signal is carried out
Isolated Shield, therefore the signal to noise ratio of the signal of telecommunication and ultrasonic signal can be increased substantially.The present invention is not only suitable for magnetosonic imaging
Ultrasonic signal is measured, and suitable for the electric signal measurement of magnetosonic Electrical imaging.
Description of the drawings
Fig. 1 apparatus of the present invention structural representations；
Supersonic array schematic diagram in Fig. 2 apparatus of the present invention；
Ultrasonic probe schematic diagram in Fig. 3 apparatus of the present invention；
In figure：1 protected type tank, 2 signal transmission interfaces, 3 ultrasound control Acquisition Circuit, 4 produce the magnet system of magnetostatic field
System, 5 coils, 6 samples, 7 articles holding tables, 8 ultrasonic shielding boxs, 9 swing pinions, 10 circular frameworks, 11 kinetic control systems, 13
Supersonic array, 14 circular frameworks, 15 transmitting array elements, 16 receive array element.
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in figure 1, the invention mainly comprises ultrasonic module, electronics module and mechanical module.Described ultrasonic module
It is mainly used in the excitation of ultrasound and the reception of ultrasonic signal, described electronics module is mainly used in electromagnetic excitation and faint telecommunications
Number collection, the function of described mechanical module is to realize the scanning of sample.
Described ultrasonic module mainly includes supersonic array 13, circular framework 10 and ultrasound control Acquisition Circuit 3.Ultrasonic battle array
Electrically connect between row 13 and ultrasound control Acquisition Circuit 3, supersonic array 13 can be single ultrasound element or double ultrasound elements, ultrasonic
Array 13 is evenly distributed on circular framework 10.Each ultrasound element in the ultrasound control control supersonic array 13 of Acquisition Circuit 3
Transmitting and reception.Supersonic array 13 both can be used as the ultrasonic reception device of magnetosonic imaging, it is also possible to used as magnetosonic Electrical imaging
Ultrasonic transmitter.
Described electronics module is mainly used in the collection of electromagnetic excitation and ultra-weak electronic signal, and it includes producing magnetostatic field
Magnet system 4, coil 5, exciting circuit, signal processing and Acquisition Circuit and kinetic control system.Described generation magnetostatic field
Magnet system 4 is superconducting magnet, permanent magnet or electromagnet, positioned at the outside of protected type tank 1, the described magnetic for producing magnetostatic field
System 4 purposes of system are that uniform magnetic field is produced in sample 6, produce the magnetostatic field direction that the magnet system 4 of magnetostatic field is produced
The magnetic direction of the pulsed magnetic field produced during with coil 5 as excitation coil is parallel, while the magnet system 4 for producing magnetostatic field is produced
The effective radius of raw magnetostatic field is more preferably less than sample 6 to the air line distance between supersonic array 13, i.e. supersonic array 14
Outside the magnetostatic field effective range that the magnet system 4 for producing magnetostatic field is produced；Described coil 5 both can be excitation coil or can
To be receiving coil, connect with exciting circuit when coil 5 is as excitation coil, when coil 5 is as receiving coil and signal
Process is connected with Acquisition Circuit；Excitation coil is connected the driving source as magnetosonic imaging with exciting circuit；Receiving coil and signal
Process, Acquisition Circuit connect the detecting system as magnetosonic Electrical imaging, and kinetic control system realizes the rotation of sample 6, transports
Autocontrol system is located at outside protected type tank 1, by the swing pinion 9 that pole is connected to inside protected type tank 1.
The function of described mechanical module is to realize the scanning of sample, and reduces the dry of electromagnetic interference and ultrasonic signal
Disturb.The signal to noise ratio of detection signal can be improved by the design of mechanical module.Described mechanical module includes articles holding table 7, ultrasound
Shielding box 8, swing pinion 9 and sound absorption thin film.The surrounding of articles holding table 7 carries gear, and the gear and swing pinion 9 of articles holding table 7 are stung
Close, swing pinion 9 drives articles holding table 7 to rotate.Ultrasonic shielding box 8 is located at the lower section of articles holding table 7, and excitation coil and receiving coil are placed
In ultrasonic shielding box 8, described sound absorption thin film is close on the internal face of protected type tank 1.Described mechanical module is sealed in
In protected type tank 1 with electro-magnetic screen function, described protected type tank 1 is also simultaneously experimental water groove.Protected type water
The supersonic array of mechanical module and ultrasonic module is placed with groove.The ultrasound control Acquisition Circuit of electronics module and ultrasonic module
Be fixed on the upper wall surface of inboard wall of cistern, between supersonic array and sample by couplant couple, couplant be insulating oil or
Person's deionized water, couplant is placed in protected type tank.
Described receiving coil and excitation coil occurs in pairs, namely excitation coil can constitute excitation coil pair, connect
Take-up circle can also constitute excitation coil pair.Excitation coil pair and receiving coil to center overlapping of axles, two of excitation coil pair
Excitation coil is located at respectively above and below sample 6, symmetrically placed, the conspicuous nurse hertz of excitation coil composition arranged up and down
Coil.Two receiving coils of receiving coil pair can also be symmetrically placed above and below sample, or is all located at
The either above or below of sample.Two receiving coils of receiving coil pair can be parallel way or series system.To carry
High s/n ratio, the coil positioned at the lower section of sample 6 is placed in the ultrasonic shielding box 8 of mechanical module, takes out true in ultrasonic shielding box 8
It is empty.The top of ultrasonic shielding box 8 is articles holding table 7, and described articles holding table 7 is circular, is led between ultrasonic shielding box 8 and articles holding table 7
A fixed pillar connection is crossed, the top of articles holding table 7 is placed acoustic pad of the radius slightly larger than articles holding table, isolates supersonic frequency
Ultrasonic signal in the range of 200KHz-100MHz.
In the sample 6 in plane and articles holding table 7 that supersonic array 13 is located is generally aligned in the same plane.Supersonic array 13 can
Being phased array supersonic linear transducer array, or single array element array.Simultaneously the ultrasonic probe of supersonic array 13 can also be by
Double array element ultrasonic probes that transmitting ultrasonic probe and reception ultrasonic probe are independently constituted.When supersonic array 13 surpasses for double array elements
During sonic probe, as shown in Fig. 2 independent reception array element 16 and independent transmitting array element 15 are coaxial, and reception array element 16 is sent out
Penetrate array element 15 to surround, the front for receiving array element 16 is circular, and the front for launching array element 15 is annular, receives array element 16 and sends out
The front for penetrating array element 15 is located in same facial plane, and the front of transmitting array element 15 and reception array element 16 just constitutes a circle
Shape front.Receiving array element 16 and transmitting array element 15 can control respectively, to avoid protected type tank 1 acoustical signal of itself to magnetosonic
The interference of imaging, posts one layer of flexible sound absorption for 200KHz-10MHz frequency ranges on six inwalls of protected type tank
Thin film, prevents the interference of the acoustical signal of the generation of protected type flume wall 1, while preventing the acoustical signal that sample 6 is produced from running into screen
The reflection for covering the wall of formula tank 1 is impacted to measurement signal.
Swing pinion 9 is rotated gear 9 and revolves together with passing through engaged gears with articles holding table 7 by kinetic control system
Turn, swing pinion 9 drives articles holding table 7 to rotate, and rotates sample 6.Described supersonic array 13 is uniformly distributed in circular bone
On frame 14.The quantity of supersonic array 13 determines the scanning accuracy to sample 6 with the anglec of rotation of swing pinion 9, such as exist
The quantity of supersonic array 13 on the circular framework 14 of a diameter of 8cm, when to realize that 360 ° are spaced 1 ° of scanning, is revolved more than 32
The anglec of rotation of rotating disk 9 is about 1 degree, and the anglec of rotation is 12 ° can then realize that 360 ° to sample 6 scan.
The present invention is easy to use and portable, and the absorption with ultrasound and sound insulation are acted on, and electromagnetic signal is carried out
Isolated Shield, therefore the signal to noise ratio of the signal of telecommunication and ultrasonic signal can be increased substantially.The present invention is not only suitable for magnetosonic imaging
Ultrasonic signal is measured, and suitable for the electric signal measurement of magnetosonic Electrical imaging.
Claims (6)
1. a kind of magnetic-sound multi- scenarios method imaging experiment device, it is characterised in that described experimental provision includes ultrasonic module, electricity
Son learns module and mechanical module；Described ultrasonic module is used for the excitation of ultrasound and the reception of ultrasonic signal, described electronics
Module is used for the collection of electromagnetic excitation and ultra-weak electronic signal, and described mechanical module realizes the scanning of sample；
Described ultrasonic module includes supersonic array (13), circular framework (10) and ultrasound control Acquisition Circuit (3)；Supersonic array
(13) electrically connect between ultrasound control Acquisition Circuit (3), supersonic array (13) is evenly distributed on circular framework (10)；Ultrasound
The transmitting and reception of each ultrasound element in control Acquisition Circuit (3) control supersonic array (13)；Supersonic array (13) is both magnetic
The ultrasonic reception device of acoustic imaging, is also the ultrasonic transmitter of magnetosonic Electrical imaging；
Described electronics module includes producing the magnet system (4) of magnetostatic field, coil (5), exciting circuit, signal processing and adopting
Collector and kinetic control system；The magnet system (4) of described generation magnetostatic field is superconducting magnet, permanent magnet or electromagnet,
Positioned at the outside of protected type tank (1), magnet system (4) purpose of described generation magnetostatic field is produced in sample (6)
Raw uniform magnetic field, the magnetostatic field direction for producing magnet system (4) generation of magnetostatic field is produced with coil (5) as during excitation coil
Pulsed magnetic field magnetic direction it is parallel, while produce magnetostatic field magnet system (4) produce magnetostatic field effective radius it is best
Less than sample (6) to the air line distance between supersonic array (13), i.e. supersonic array (14) positioned at the magnetic for producing magnetostatic field
Outside the magnetostatic field effective range that system system (4) is produced；Described coil (5) is both excitation coil and receiving coil, works as coil
(5) connect with exciting circuit as during excitation coil, connect with Acquisition Circuit with signal processing when coil (5) is as receiving coil
Connect；Excitation coil is connected the driving source as magnetosonic imaging with exciting circuit；Receiving coil is connected with signal processing, Acquisition Circuit
As the detecting system of magnetosonic Electrical imaging；Kinetic control system is located at protected type tank (1) outward, and by pole protected type is connected to
On the swing pinion (9) of the internal mechanical module of tank (1)；
Described mechanical module includes the articles holding table with gear (7), ultrasonic shielding box (8), swing pinion (9) and sound absorption thin film；
The surrounding of articles holding table (7) carries gear, and the gear of articles holding table (7) and swing pinion (9) are engaged, and swing pinion (9) drives glove
Platform (7) rotates；Ultrasonic shielding box (8) is placed on ultrasonic shielding box positioned at articles holding table (7) lower section, excitation coil and receiving coil
(8) in；Described sound absorption thin film is close on the internal face of protected type tank (1)；Described mechanical module is sealed in protected type
In tank (1), the supersonic array of ultrasonic module is also placed with protected type tank (1)；Electronics module and ultrasonic module it is super
Acoustic control Acquisition Circuit is fixed on the upper wall surface of protected type tank (1) inwall, by placing between supersonic array and sample
Couplant coupling in protected type tank (1).
2. according to the magnetic described in claim 1-sound multi- scenarios method imaging experiment device, it is characterised in that described ultrasound shielding
It is connected by a fixed pillar between box (8) and articles holding table (7), an acoustic pad, acoustic pad are placed in the top of articles holding table (7)
Radius slightly larger than circular articles holding table (7) radius；The sample in plane and articles holding table (7) that supersonic array (13) is located
In being generally aligned in the same plane.
3. according to the magnetic described in claim 1-sound multi- scenarios method imaging experiment device, it is characterised in that described supersonic array
(13) it is single ultrasound element, ultrasound control Acquisition Circuit (3) controls the transmitting of interior each ultrasound element of supersonic array (13) and connects
Receive.
4. according to the magnetic described in claim 1-sound multi- scenarios method imaging experiment device, it is characterised in that described supersonic array
(13) it is by transmitting ultrasonic probe and receives double ultrasound elements for constituting of ultrasonic probe, transmitting ultrasonic probe and reception ultrasonic probe
Control independently and respectively；Receive array element (16) and transmitting array element (15) is coaxial, receive array element (16) and be launched array element (15)
It surround；The front for receiving array element (16) is circle, and the front for launching array element (15) is annular, receives array element (16) and transmitting array element
(15) front is located in same facial plane, and is launched array element (15) and received front one circle of composition of array element (16)
Face.
5. according to the magnetic described in claim 1-sound multi- scenarios method imaging experiment device, it is characterised in that described protected type water
One layer of flexible sound absorption thin film for 200KHz-10MHz frequency ranges is posted on six inwalls of groove.
6. according to the magnetic described in claim 1-sound multi- scenarios method imaging experiment device, it is characterised in that described receiving coil
Occur in pairs with excitation coil；Excitation coil pair and receiving coil are to center overlapping of axles, two excitation lines of excitation coil pair
Circle is respectively symmetrically and is positioned over above and below sample (6), the conspicuous nurse hertz coil of excitation coil composition arranged up and down；Connect
Two receiving coils of take-up circle pair are symmetrically placed above and below sample (6), or are all placed in sample (6)
Either above or below；Coil below sample (6) is placed in the ultrasonic shielding box (8) of mechanical module, ultrasound screen
Cover the interior evacuation of box (8).
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| CN105486924B (en) * | 2015-12-22 | 2018-01-19 | 中国石油大学(华东) | Contactless conductor conductivity measuring method based on magnetosonic electrical effect |
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| CN112683992B (en) * | 2020-12-22 | 2022-05-17 | 中国医学科学院生物医学工程研究所 | Positioning device and method capable of simultaneously detecting magnetic acoustic signals and electric field by noise-containing shielding |
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| CN114224298B (en) * | 2022-01-17 | 2023-12-01 | 中国科学院电工研究所 | Magneto-acoustic electric imaging system and method under nuclear magnetic resonance |
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