CN102499681A - Rotation-type coil group applicable to magnetic induction tomography and arrangement method thereof - Google Patents
Rotation-type coil group applicable to magnetic induction tomography and arrangement method thereof Download PDFInfo
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- CN102499681A CN102499681A CN2011103149067A CN201110314906A CN102499681A CN 102499681 A CN102499681 A CN 102499681A CN 2011103149067 A CN2011103149067 A CN 2011103149067A CN 201110314906 A CN201110314906 A CN 201110314906A CN 102499681 A CN102499681 A CN 102499681A
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Abstract
The invention discloses a rotation-type coil group applicable to magnetic induction tomography and an arrangement method thereof. The arrangement method comprises the following steps: a group of coils are arranged in an annular form by surrounding a tested object, one coil is an exciting coil, the other coils are measuring coils, alternating current is switched in the exciting coil, the magnetic field change caused by eddy induction inside the tested object can be detected by the measuring coils, and sufficient measurement data is obtained by the rotation mode for meeting the requirement of the magnetic induction tomography. The rotation modes of the coil group comprise an object rotation mode, a coil rotation mode and a double rotation mode. According to the invention, the number of coils is reduced by 50%, the coupling relation between the coils is simplified, and the measurement precision and stability of a detecting system can be favorably improved; with the rotation modes, measurement data same as that of a conventional magnetic induction tomography coil system can be obtained, and more measurement data can be obtained by controlling the rotation angle; and in addition, being matched with the improved tomography algorithm, the rotation-type coil group disclosed by the invention can achieve better imaging quality.
Description
Technical field
The invention belongs to the technical field of imaging in the biomedical engineering, relate to the method that the noncontact mode obtains the magnetic induction tomography of electrical impedance tomography, be specifically related to a kind of rotary coil groups and method for arranging thereof that is applicable to magnetic induction tomography.
Background technology
Electrical impedance tomography is a kind of medical imaging method that is different from traditional CT, MRI etc.; It measures response voltage/electric current then through one group of electrode injection current/voltage that is attached to a certain tomography of measurand (like human body) surface, uses imaging algorithm and rebuilds the inner electrical impedance distribution image of electrode place tomography.
Magnetic induction tomography is a kind of contactless impedance tomograph imaging method; It is through applying the alternating current excitation with the discontiguous coil of measurand; And measure the caused changes of magnetic field of inductive loop, rebuild the inner electrical impedance distribution image of coil tomography of living in through imaging algorithm.Compare with electrical impedance tomography, magnetic induction tomography is in order to obtain the electrical impedance distribution in a certain tomography of measurand equally, but has adopted non-contacting pick off, i.e. coil, thereby more convenient on using.
According to the data-searching that the applicant carried out, there are 2 with the approaching technology of the application.One is " non-contact magnetic inductive encephaledema monitoring method " (monitoring method that non-contact magnetic inductive brain distribution of conductivity changes) of applicant's application in 2005; This method has proposed several kinds of methods of utilizing magnetic induction principle monitoring brain distribution of conductivity to change; Comprising a kind of magnetic induction tomography method; The coil system that its adopts for " excitation coil that quantity is equal to measure coil rounded, uniformly-spaced be arranged in around the monitoring objective "; Also promptly comprise two coils in same position, one is excitation coil, and one for measuring coil.Another is " a kind of highly sensitive open type magnetic induction image measuring device " of University Of Chongqing's application in 2007; The used coil arrangement mode of this device is enclosed in the measurand periphery for being circular arc; Same position comprises 3 coils; Middle one is excitation coil, and two are the variate coil up and down.More than all do not relate to the rotation of coil system in two applications.
Applied coil system has 2 or 3 coils in the existing magnetic induction tomography in same position; Both comprise excitation coil and also comprised the measurement coil; This causes the coil quantity in the system more; Coupled relation each other is complicated, has influenced the performance of whole magnetic induction tomography data collecting system to a certain extent.
Summary of the invention
To the many problems of coil number in the magnetic induction tomography, the objective of the invention is to, a kind of rotary coil groups that is applicable to magnetic induction tomography is proposed; A coil only is set in each position; Only have one to be excitation coil in all coils, all the other are the measurement coil, through the revolving coil group; Obtain identical with traditional magnetic induction tomography or more measurement data, rebuild so that realize the electrical impedance images in the tomography.
In order to realize above-mentioned task, the present invention takes following technical solution to be achieved:
First kind of technical scheme:
A kind of rotary coil groups that is applicable to magnetic induction tomography comprises excitation coil and measures coil, it is characterized in that, described excitation coil is arranged on the support with the measurement coil encircling, and an excitation coil is wherein only arranged, and all the other are for measuring coil; Pallet is arranged on the support, gear is installed on the pallet, gear is connected on the motor through synchronous band.
Second kind of technical scheme:
A kind of rotary coil groups that is applicable to magnetic induction tomography comprises excitation coil and measures coil, it is characterized in that, described excitation coil is arranged on the support with the measurement coil encircling, and an excitation coil is wherein only arranged, and all the other are for measuring coil; Pallet is arranged on the support, gear is installed on the support, gear is connected on the motor through synchronous band.
The third technical scheme:
A kind of rotary coil groups that is applicable to magnetic induction tomography comprises excitation coil and measures coil, it is characterized in that, described excitation coil is arranged on the support with the measurement coil encircling, and an excitation coil is wherein only arranged, and all the other are for measuring coil; Pallet is arranged on the support, be separately installed with gear on support and the pallet, gear is connected respectively on the motor separately through synchronous band separately.
A kind of method for arranging that is applicable to the rotary coil groups of magnetic induction tomography is characterized in that, one group of excitation coil is annular with the measurement coil arranges around measurand; Its center is in a plane; An excitation coil is wherein only arranged, and all the other pass to alternating current for measuring coil in excitation coil; The alternating magnetic field that is produced can go out the alternation eddy current in the measurand induced inside; The inner electrical impedance distribution of this eddy current and measurand is relevant, and the measurement coil through diverse location can detect the variation in the magnetic field that eddy current causes, applying magnetic induction fault imaging algorithm can be rebuild the electrical impedance distribution image of measurand inside; For obtaining the required measurement data of image reconstruction; Under the condition that all coils relative position is constant in the hold-in winding group, the mode through rotation obtains the measurement data of different angles, and the mode of rotation has following three kinds:
A: excitation coil is motionless with the measurement coil, the measurand rotation;
B: measurand is motionless, excitation coil and the rotation of measurement coil;
C: excitation coil and measurement coil and each spinning of measurand.
The rotary coil groups that is applicable to magnetic induction tomography of the present invention; One group of excitation coil and measurement coil encircling measurand are arranged; Excitation coil only has an excitation coil with measuring in the coil groups, and all the other are for measuring coil, and comparing the used coil arrangement mode of traditional magnetic induction tomographic systems has reduced quantity over half; For guaranteeing the reconstruction of tomography electrical impedance images, obtain enough measurement data through the mode of rotating.
Major advantage of the present invention has two:
1) only there is a kind of coil same position; Perhaps be that excitation coil is perhaps for measuring coil; Reduce half the coil number, thereby simplified the coupled relation between the coil, helped suppressing the noise of whole magnetic induction tomography hardware system; Elevator system certainty of measurement and stability are finally improved image quality.
2) through the mode of rotation, both can obtain the measurement data identical, thereby the angle that also can control rotation obtains more measurement data, cooperate the improvement of imaging algorithm, be expected to obtain better image quality with traditional magnetic induction tomography coil system.
Description of drawings
Fig. 1 is a measurand rotation mode sketch map, and wherein motor is through the rotation of the pallet of band drive synchronously, and measurand places on the pallet.
Fig. 2 is excitation coil and measurement coil rotation mode sketch map, and wherein motor rotates through driving coil brace synchronously.
Fig. 3 is a dual rotary mode sketch map, and wherein motor 1 is through be with 1 to drive the coil brace rotation synchronously, and motor 2 is through be with 2 to drive the pallet rotation synchronously, and measurand places on the pallet.
Fig. 4 is excitation coil and measurement coil circular arrangement mode sketch map, and an excitation coil is wherein only arranged, and all the other are measured the quantity of coil and can choose arbitrarily for measuring coil, and being generally imaging need be more than or equal to 5.
Fig. 5 is excitation coil and measurement coil fan pattern sketch map, and an excitation coil is wherein only arranged, and all the other are measured the quantity of coil and can choose arbitrarily for measuring coil, and being generally imaging need be more than or equal to 5.
Fig. 6 is the synthetic sketch map of object rotation mode, circular arrangement mode.
Fig. 7 is the synthetic sketch map of object rotation mode, fan pattern.
Fig. 6 and Fig. 7 are two kinds in three kinds of excitation coils and measurement coil rotation mode and 6 kinds of combinations of two kinds of excitation coils and measurement coil arrangement modes, and other 4 kinds of combinations can be similar to Fig. 6 and Fig. 7 makes up.
With implementing the present invention is made further detailed description below in conjunction with accompanying drawing.
The specific embodiment
Present embodiment provides three kinds of excitation coils and measures coil (hereinafter to be referred as coil groups) and rotation mode and two kinds of excitation coils and measure the coil arrangement mode, can obtain 6 kinds of rotary coil groups through combination.
First kind: be applicable to the rotary coil groups of magnetic induction tomography, comprise excitation coil and measure coil that it is characterized in that, described excitation coil is arranged on the support with the measurement coil encircling, and an excitation coil is wherein only arranged, all the other are for measuring coil; Pallet is arranged on the support, gear is installed on the pallet, gear is connected on the motor through synchronous band.
Second kind: be applicable to the rotary coil groups of magnetic induction tomography, comprise excitation coil and measure coil that it is characterized in that, described excitation coil is arranged on the support with the measurement coil encircling, and an excitation coil is wherein only arranged, all the other are for measuring coil; Pallet is arranged on the support, gear is installed on the support, gear is connected on the motor through synchronous band.
The third: be applicable to the rotary coil groups of magnetic induction tomography, comprise excitation coil and measure coil that it is characterized in that, described excitation coil is arranged on the support with the measurement coil encircling, and an excitation coil is wherein only arranged, all the other are for measuring coil; Pallet is arranged on the support, be separately installed with gear on support and the pallet, gear is connected respectively on the motor separately through synchronous band separately.
Three kinds of coil groups rotation modes are respectively:
1) the motionless and measurand of coil groups rotation is hereinafter to be referred as " object rotation mode ";
2) the motionless and coil groups of measurand rotation is hereinafter to be referred as " coil rotation mode ";
3) each spinning of coil groups and measurand is hereinafter to be referred as " dual rotary mode ".
Two kinds of coil groups arrangement modes are respectively:
1) coil groups with the center uniformly-spaced mode be arranged on the circle, the excitation coil number is 1, all the other are for measuring coil, hereinafter to be referred as " circular arrangement mode ";
2) measure coil with the center uniformly-spaced mode be arranged on one section circular arc, excitation coil is centered close on the same circle at the center of circular arc, excitation coil with measure coil groups form one fan-shaped, hereinafter to be referred as " fan pattern ".
All are measured coils and have identical parameter, and the parameter of excitation coil can with measure that coil is different also can be identical.
1, followingly respectively 3 kinds of coil groups rotation modes is described.
1) object rotation mode: the rotation of the motionless and measurand of coil groups, referring to Fig. 1.
Its operation principle is: coil groups keeps transfixion attached on the support in measuring process; Measurand places on the pallet, links to each other with a gear below the pallet, and gear is connected on the motor through synchronous band; Rotate by computer-controlled stepper motor, thereby drive the pallet rotation; The angle of the each rotation of pallet is by computer program-control.
For the circular arrangement mode, if the angle of the each rotation of pallet be 360 °/(all coil groups numbers), then rotating a circle needs (all coil groups numbers) inferior rotation; If increase the measurement data number, the angle of the each rotation of support can be 360 °/(whole coil groups number * k, k=2,3 ..., n, n are natural number), the needs that then rotate a circle (all the coil groups numbers multiply by k, k=2, and 3 ..., n, n are natural number) and inferior rotation; A kind of k is doubly before being for the number of a kind of gained measurement data in back.
For fan pattern, if being two, the angle of the each rotation of pallet measures coil and the formed angle in the center of circle, then rotating a circle needs the inferior rotation of 360/ (measuring coil and the whole coil groups numbers of the formed angle in the center of circle for two); If increase the measurement data number, the angle of the each rotation of support can be two and measures coil and the formed angle/k in the center of circle, k=2,3;, n, n are natural number; Then rotating a circle needs 360/ (to measure coil and the whole coil groups number of the formed angle in center of circle * k, k=2,3 for two;, n, n are natural number) and inferior rotation; A kind of k is doubly before being for the number of a kind of gained measurement data in back.
2) coil rotation mode: the rotation of the motionless and coil groups of measurand, referring to Fig. 2.
Its operation principle is: coil groups has pallet around attached on the support on this support, links to each other with a gear below the support, and gear is connected on the motor through synchronous band; Rotate by computer-controlled stepper motor, thereby drive the support rotation; The angle of the each rotation of support is by computer program-control; Measurand places on the pallet, in measuring process, keeps transfixion.
The anglec of rotation and measurement data number are calculated the same.
3) dual rotary mode: each spinning of coil groups and measurand, referring to Fig. 3.
Its operation principle is: coil groups is around attached on the support, links to each other with a gear below this support, and gear is through be with 1 to be connected on the motor 1 synchronously; Rotate by computer-controlled stepper motor 1, thereby drive the support rotation; The angle of the each rotation of support is by computer program-control; Measurand places on the pallet on the support, links to each other with a gear below the pallet, and gear is through be with 2 to be connected on the motor 2 synchronously; Rotate by computer-controlled stepper motor 2, thereby drive the pallet rotation; The angle of the each rotation of pallet is by computer program-control.
The anglec of rotation and measurement data number are calculated the same.
2, provide two kinds of coil groups arrangement modes below, be respectively:
1) circular arrangement mode: coil groups with the center uniformly-spaced mode be arranged on the circle, the excitation coil number is 1, all the other, are measured the number of coil and can select arbitrarily referring to Fig. 4 for measuring coil, generally select number greater than 5 for guaranteeing image reconstruction.
Its operation principle is: in excitation coil, pass to the alternation sine-wave current; So around excitation coil, form the same frequency alternating magnetic field; Be in the measurand inside that coil groups holds and form same frequency alternation eddy current; This alternation eddy current can form secondary alternating magnetic field again, and excitation field and secondary magnetic field can detect through the measurement coil at diverse location place; When hold-in winding group transfixion, this mode only can obtain the part in the frame data; Through above-mentioned rotation mode, change the position of excitation coil, encourage respectively and measure repeatedly, a finally synthetic complete frame measurement data, the reconstruction that can be used for the anti-image of tomography internal resistance is calculated.
The circular arrangement mode can obtain excitation and the measurement data identical with traditional magnetic induction tomography, and original imaging algorithm can directly be used; If reduce the angle of each rotation, promptly encrypt the number of times when rotating a circle, can obtain more measurement data, at this moment need the original imaging algorithm of modify, data but more help obtaining better image quality.
2) fan pattern: measure coil with the center uniformly-spaced mode be arranged on one section circular arc; Excitation coil is centered close on the same circle at the center of circular arc; Excitation coil is fan-shaped with one of measurement coil groups formation; Referring to Fig. 5, measure the number of coil and can select arbitrarily, generally select number greater than 5 for guaranteeing image reconstruction.
Its operation principle is: excitation and measuring principle are the same; Because when the sector (-shaped) coil group was arranged, the measurement group did not hold whole measurands, so the number of the measurement data of gained will be less than the circular arrangement mode, need modify tomographic image reconstructing algorithm; For obtaining more measurement data, can reduce the angle of each rotation, promptly encrypt the number of times when rotating a circle.
Measure the part periphery that coil has only held measurand in the fan pattern, compare with the circular coil group of identical measurement coil spacing, the number of its each measurement data that obtains is less; But the distance of all measurement coils and excitation coil is comparatively approaching, so the dynamic range of the measuring-signal of gained is less, promotes the performance of testing circuit more easily, thereby improves accuracy of detection.
3, the rotary coil system of reality
3 kinds of coil groups rotation modes and 2 kinds of coil groups arrangement modes are made up, just can obtain actual available rotary coil system, have 6 kinds of combinations, below 2 kinds of combinations for example:
1) object rotation mode, circular arrangement mode synthesis model: the rotation of the motionless and measurand of coil groups; Coil groups with the center uniformly-spaced mode be arranged on the circle, referring to Fig. 6, wherein the excitation coil number is 1; Measuring the coil number is 15, and its number can be adjusted.
Its operation principle is: coil groups keeps transfixion around attached on the support in measuring process; Measurand places on the rotary-tray, links to each other with a gear below the pallet, and gear is connected on the motor through synchronous band; In excitation coil, pass to the alternation sine-wave current; So around excitation coil, form the same frequency alternating magnetic field; Be in the measurand inside that coil groups holds and form same frequency alternation eddy current; This alternation eddy current can form secondary alternating magnetic field again, and excitation field and secondary magnetic field detect through the measurement coil at diverse location place, obtains one group of measurement data; Computer-controlled stepper motor rotates, and the rotation of driven rotary pallet repeats above-mentioned steps, obtains one group of measurement data once more; Rotate a circle, obtain the complete measurement data of a frame, these data can be used for the reconstruction of the anti-image of tomography internal resistance and calculate.
2) object rotation mode, fan pattern synthesis model: the rotation of the motionless and measurand of coil groups; Measure coil with the center uniformly-spaced mode be arranged on one section circular arc; Excitation coil is centered close on the same circle at the center of circular arc, and referring to Fig. 7, wherein the excitation coil number is 1; Measuring the coil number is 7, and its number can be adjusted.
Its operation principle is: excitation and measuring principle are the same, compare with the circular coil group of identical measurement coil spacing, and the number of its each measurement data that obtains is less, needs modify tomographic image reconstructing algorithm.
The rotary coil system of 6 kinds of all combinations all can obtain more measurement data through the method that reduces the anglec of rotation, thereby helps obtaining the image of better magnetic induction tomography.
Claims (10)
1. a rotary coil groups that is applicable to magnetic induction tomography comprises excitation coil and measures coil, it is characterized in that, described excitation coil is arranged on the support with the measurement coil encircling, and an excitation coil is wherein only arranged, and all the other are for measuring coil; Pallet is arranged on the support, gear is installed on the pallet, gear is connected on the motor through synchronous band.
2. a rotary coil groups that is applicable to magnetic induction tomography comprises excitation coil and measures coil, it is characterized in that, described excitation coil is arranged on the support with the measurement coil encircling, and an excitation coil is wherein only arranged, and all the other are for measuring coil; Pallet is arranged on the support, gear is installed on the support, gear is connected on the motor through synchronous band.
3. a rotary coil groups that is applicable to magnetic induction tomography comprises excitation coil and measures coil, it is characterized in that, described excitation coil is arranged on the support with the measurement coil encircling, and an excitation coil is wherein only arranged, and all the other are for measuring coil; Pallet is arranged on the support, be separately installed with gear on support and the pallet, gear is connected respectively on the motor separately through synchronous band separately.
4. a method for arranging that is applicable to the rotary coil of magnetic induction tomography is characterized in that, one group of excitation coil is annular with the measurement coil arranges around measurand; Its center is in a plane; An excitation coil is wherein only arranged, and all the other pass to alternating current for measuring coil in excitation coil; The alternating magnetic field that is produced can go out the alternation eddy current in the measurand induced inside; The inner electrical impedance distribution of this eddy current and measurand is relevant, and the measurement coil through diverse location can detect the variation in the magnetic field that eddy current causes, applying magnetic induction fault imaging algorithm can be rebuild the electrical impedance distribution image of measurand inside; For obtaining the required measurement data of image reconstruction; Under the condition that all coils relative position is constant in the hold-in winding group, the mode through rotation obtains the measurement data of different angles, and the mode of rotation has following three kinds:
A: excitation coil is motionless with the measurement coil, the measurand rotation;
B: measurand is motionless, excitation coil and the rotation of measurement coil;
C: excitation coil and measurement coil and each spinning of measurand.
5. method as claimed in claim 4 is characterized in that, described excitation coil with measure coil with the center uniformly-spaced mode be arranged on the circle, the excitation coil number is 1, measures the coil number more than or equal to 5.
6. method as claimed in claim 4; It is characterized in that; Excitation coil and one of slotted line circle formation are fan-shaped, and excitation coil is 1, measure the coil number more than or equal to 5; Excitation coil with measure coil with the center uniformly-spaced mode be arranged on one section circular arc, excitation coil is centered close on the same circle at the center of circular arc.
7. method as claimed in claim 5 is characterized in that, the angle of each rotation be 360 ° divided by whole excitation coils with measure the coil number.
8. method as claimed in claim 6 is characterized in that, the angle of each rotation is that 360 ° of numbers divided by whole excitation coils and measurement coil multiply by k, k=2, and 3 ..., n, n are natural number.
9. method as claimed in claim 5 is characterized in that, the angle of each rotation is two and measures coil and the formed angle in the center of circle.
10. method as claimed in claim 6 is characterized in that, the angle of each rotation is two and measures coils and the formed angle in the center of circle divided by k, k=2, and 3 ..n, n are natural number.
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| CN103006185A (en) * | 2012-12-19 | 2013-04-03 | 中国人民解放军第四军医大学 | Device and method for non-contact magnetic induction impedance plane projection imaging |
| CN104257382A (en) * | 2014-09-11 | 2015-01-07 | 东北大学 | Electromagnetic wave propagation speed based biological tissue electromagnetic parameter imaging device and method |
| US9207197B2 (en) | 2014-02-27 | 2015-12-08 | Kimberly-Clark Worldwide, Inc. | Coil for magnetic induction to tomography imaging |
| US9320451B2 (en) | 2014-02-27 | 2016-04-26 | Kimberly-Clark Worldwide, Inc. | Methods for assessing health conditions using single coil magnetic induction tomography imaging |
| US9442088B2 (en) | 2014-02-27 | 2016-09-13 | Kimberly-Clark Worldwide, Inc. | Single coil magnetic induction tomographic imaging |
| CN106073777A (en) * | 2016-05-30 | 2016-11-09 | 杭州永川科技有限公司 | A kind of self-alignment magnetic induction image system and method |
| CN107045071A (en) * | 2016-02-08 | 2017-08-15 | 罗伯特·博世有限公司 | Sensor device and method at least one revolving property for determining rotate element |
| WO2020087935A1 (en) * | 2018-11-01 | 2020-05-07 | 苏州瑞派宁科技有限公司 | Ct device |
| CN116327162A (en) * | 2023-05-11 | 2023-06-27 | 赛福凯尔(绍兴)医疗科技有限公司 | Three-dimensional imaging method, system, device, computer equipment and storage medium |
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| CN103006185A (en) * | 2012-12-19 | 2013-04-03 | 中国人民解放军第四军医大学 | Device and method for non-contact magnetic induction impedance plane projection imaging |
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| US9207197B2 (en) | 2014-02-27 | 2015-12-08 | Kimberly-Clark Worldwide, Inc. | Coil for magnetic induction to tomography imaging |
| US9320451B2 (en) | 2014-02-27 | 2016-04-26 | Kimberly-Clark Worldwide, Inc. | Methods for assessing health conditions using single coil magnetic induction tomography imaging |
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| CN104257382A (en) * | 2014-09-11 | 2015-01-07 | 东北大学 | Electromagnetic wave propagation speed based biological tissue electromagnetic parameter imaging device and method |
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| CN106073777A (en) * | 2016-05-30 | 2016-11-09 | 杭州永川科技有限公司 | A kind of self-alignment magnetic induction image system and method |
| WO2020087935A1 (en) * | 2018-11-01 | 2020-05-07 | 苏州瑞派宁科技有限公司 | Ct device |
| CN116327162A (en) * | 2023-05-11 | 2023-06-27 | 赛福凯尔(绍兴)医疗科技有限公司 | Three-dimensional imaging method, system, device, computer equipment and storage medium |
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Application publication date: 20120620 |