CN111227835B - Dynamic knee joint imaging device and application method thereof - Google Patents
Dynamic knee joint imaging device and application method thereof Download PDFInfo
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- CN111227835B CN111227835B CN202010056005.1A CN202010056005A CN111227835B CN 111227835 B CN111227835 B CN 111227835B CN 202010056005 A CN202010056005 A CN 202010056005A CN 111227835 B CN111227835 B CN 111227835B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 19
- 210000000629 knee joint Anatomy 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims abstract description 31
- 210000000689 upper leg Anatomy 0.000 claims abstract description 16
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 210000001699 lower leg Anatomy 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 5
- 230000037396 body weight Effects 0.000 claims description 3
- 210000000845 cartilage Anatomy 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000000264 spin echo pulse sequence Methods 0.000 claims description 3
- 210000002303 tibia Anatomy 0.000 claims description 3
- 210000001694 thigh bone Anatomy 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 description 6
- 210000000988 bone and bone Anatomy 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003759 clinical diagnosis Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003902 lesion Effects 0.000 description 1
- 210000003041 ligament Anatomy 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 201000008482 osteoarthritis Diseases 0.000 description 1
- 230000001575 pathological effect Effects 0.000 description 1
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Engineering & Computer Science (AREA)
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- Pathology (AREA)
- High Energy & Nuclear Physics (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
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Abstract
The invention discloses a knee joint dynamic imaging device and a using method thereof, wherein the knee joint dynamic imaging device comprises a cyclic loading assembly, a magnetic resonance scanner and a data terminal; the cyclic loading assembly comprises an air cylinder and a sickbed, the air cylinder is in transmission connection with a push rod, the push rod is connected with a foot sleeve, thigh binding bands, shank binding bands and a fixing clamp are arranged on the top surface of the sickbed, a pressure sensor is arranged between the push rod and the foot sleeve, and a displacement sensor is arranged between the air cylinder and the foot sleeve; the data terminal is in signal connection with the pressure sensor, the displacement sensor, the air cylinder and the magnetic resonance scanner, and comprises an I/O device, an electronic clock, a processing center and a counter. The invention can carry out imaging operation on the joints under the load state, effectively reduces the influence of other phases on the image, and has simple structure and lower cost.
Description
Technical Field
The invention relates to the field of medical imaging devices, in particular to a knee joint dynamic imaging device and a using method thereof.
Background
In the clinical diagnosis of bone joints, there is a very important examination that detects the morphology and intra-articular structure of the joint under load to analyze the development and pathological conditions of bone joint lesions. It is well known that the joint meniscus and ligament forms of a human body in a large joint are different from those in a non-load state, and the intra-joint structural change and the relative position change of a human body in a walking or standing state cannot be displayed in joint imaging examination and physical examination in the non-load state. Therefore, in orthopaedics and imaging examination, the weight-bearing position X-ray joint radiograph is a common examination means and is also one of standard imaging technologies for diseases such as osteoarthritis.
The existing MRI imaging devices scan and image the joints in a no-load state, and when the joints of the human body are in a load state, the joints deform, and how to eliminate the influence of the phase on the image is a yet to be solved problem.
Disclosure of Invention
The invention aims to provide a knee joint dynamic imaging device and a using method thereof, which can perform imaging operation on joints in a load state, effectively reduce the influence of other phases on images, and have simple structure and lower cost.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention discloses a knee joint dynamic imaging device, which comprises a cyclic loading assembly, a magnetic resonance scanner and a data terminal;
the cyclic loading assembly comprises an air cylinder and a sickbed, the air cylinder is in transmission connection with a push rod, the push rod is connected with a foot sleeve, thigh binding bands, shank binding bands and a fixing clamp are arranged on the top surface of the sickbed, a pressure sensor is arranged between the push rod and the foot sleeve, and a displacement sensor is arranged between the air cylinder and the foot sleeve;
the data terminal is in signal connection with the pressure sensor, the displacement sensor, the air cylinder and the magnetic resonance scanner, and comprises an I/O device, an electronic clock, a processing center and a counter.
Preferably, the top surface of the sickbed is of a strong friction structure.
Preferably, the foot cover is a rigid plastic.
Preferably, the displacement sensor is a laser displacement sensor.
Preferably, the fixing clamp is made of hard plastic, and after 3D scanning imaging is carried out on a human body or a cadaver to be scanned, 3D printing customization is carried out by adopting high-strength plastic, and the fixing clamp is clamped at the upper thigh section or the proximal femur.
Preferably, the displacement sensor is arranged on the outer wall of the cylinder.
The invention also discloses a using method of the imaging device, which comprises the following steps:
s100, fixing the thighs of the human body by using thigh binding belts, fixing the shanks of the human body by using shank binding belts, fixing the thighbones of the human body by using a fixing clamp, and wearing foot covers by a patient;
s200, driving the cylinder to circularly load the knee joint, wherein the load is F, the word load cycle time is T, the cycle times are C, the magnetic resonance scanner selects a sagittal plane which is positioned in an inner compartment of the knee joint and is fully contacted with femur and tibia side cartilages to perform,
wherein the magnetic resonance scanner is a magnetic resonance test sequence employing a 3.0T magnetic resonance scanner and with displacement encoding image processing, in which sequence
wherein ,
as phase data, Δx is displacement variation, γ H Is gyromagnetic ratio, t enc For encoding gradient duration, G de Gradient magnitude, G 'for displacement encoding in the x or y direction on a plane' de Is the gradient size of the reference image.
Preferably, in step S200, F is 50% or 100% of the patient' S body weight, T is 5S or 10S, and c is 50 times, 100 times or 200 times.
Preferably, in step S200, the encoding gradient of the displacement encoding MRI is 0.33 pi/mm in all 2 directions on the plane, and the TM buffer time of 600ms is set to ensure that the MRI image is acquired during the loading plateau period.
Preferably, in step S200, the TE time of the Single-shot fast spin echo sequence is 62/72/82ms, the TR time is 5000ms, the scanning FOV is 180×180mm, the matrix size is 256×256/384×384/512×512pixels, the layer thickness is 1mm, and the excitation times are 16 times.
The invention has the beneficial effects that:
1. the invention can image the joint in the load state.
2. The invention effectively reduces the influence of other phases on the image.
3. The invention has simple structure and lower cost.
Drawings
FIG. 1 is a schematic view of a cylinder;
FIG. 2 is a schematic diagram of the present invention.
In the figure: 1-cylinder, 2-push rod, 3-pressure sensor, 4-foot cover, 5-sick bed, 6-thigh bandage, 7-shank bandage, 8-mounting fixture.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
The a part in fig. 2 is the MRI imaging window.
As shown in fig. 1 and 2, the invention comprises a cyclic loading assembly, a magnetic resonance scanner and a data terminal;
the cyclic loading assembly comprises an air cylinder 1 and a sickbed 5, wherein the air cylinder 1 is in transmission connection with a push rod 2, the push rod 2 is connected with a foot sleeve 4, the top surface of the sickbed 5 is provided with thigh binding bands 6, shank binding bands 7 and a fixing clamp 8, a pressure sensor 3 is arranged between the push rod 2 and the foot sleeve 4, a displacement sensor is arranged between the air cylinder 1 and the foot sleeve 4, the air cylinder 1 and the push rod 2 are all made of hard plastics;
the data terminal is in signal connection with the pressure sensor 3, the displacement sensor, the air cylinder 1 and the magnetic resonance scanner, and comprises an I/O device, an electronic clock, a processing center and a counter.
The displacement sensor is a two-dimensional laser displacement sensor and is used for measuring the displacement of the foot sleeve 4 in the loading direction.
The using method of the device comprises the following steps:
s100, horizontally placing a knee joint on a test bench, fixing feet by a hard plastic foot sleeve 4 fixedly connected with a loading device, keeping the knee joint in a straightened position, fixing a femur by a wooden clamp to avoid movement of a body in a loading direction when the knee joint is loaded, fixing a thigh of a human body by using a thigh strap 6, fixing a shank of the human body by using a shank strap 7, and installing a two-dimensional laser displacement sensor at the tail end of the loading device to detect the displacement of the foot sleeve 4 in the loading direction;
s200, driving the air cylinder 1 to circularly load the knee joint, wherein the load is F, the word load cycle time is T, the cycle times are C, the magnetic resonance scanner selects a sagittal plane which is positioned in an inner compartment of the knee joint and is fully contacted with femur and tibia side cartilages to perform,
wherein the magnetic resonance scanner is a magnetic resonance test sequence adopting a 3.0T magnetic resonance scanner and processing displacement coding images, an electronic triggering device is adopted to synchronize MRI imaging and knee joint cyclic loading device, and the magnetic resonance test sequence is in sequence
wherein ,
as phase data, Δx is displacement variation, γ H Is gyromagnetic ratio, t enc For encoding gradient duration, G de Gradient magnitude, G 'for displacement encoding in the x or y direction on a plane' de Is the gradient size of the reference image.
In step S200, F is 50% or 100% of the patient' S body weight, T is 5S or 10S, and c is 50 times, 100 times, or 200 times.
In step S200, the encoding gradient of displacement encoding MRI is 0.33 pi/mm in 2 directions on a plane, and the TM buffer time of 600ms is set to ensure that MRI images are acquired in the loading platform period.
In step S200, the TE time of the Single-shot fast spin echo sequence is 62/72/82ms, the TR time is 5000ms, the scanning FOV is 180×180mm, the matrix size is 256×256/384×384/512×512pixels, the layer thickness is 1mm, and the excitation times are 16 times.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A knee joint dynamic imaging device, characterized in that: the system comprises a cyclic loading assembly, a magnetic resonance scanner and a data terminal;
the cyclic loading assembly comprises an air cylinder and a sickbed, the air cylinder is in transmission connection with a push rod, the push rod is connected with a foot sleeve, thigh binding bands, shank binding bands and a fixing clamp are arranged on the top surface of the sickbed, a pressure sensor is arranged between the push rod and the foot sleeve, and a displacement sensor is arranged between the air cylinder and the foot sleeve;
the data terminal is in signal connection with the pressure sensor, the displacement sensor, the air cylinder and the magnetic resonance scanner, and comprises an I/O device, an electronic clock, a processing center and a counter;
the using method of the imaging device comprises the following steps:
s100, fixing the thighs of the human body by using thigh binding belts, fixing the shanks of the human body by using shank binding belts, fixing the thighbones of the human body by using a fixing clamp, and wearing foot covers by a patient;
s200, driving the cylinder to circularly load the knee joint, wherein the load is F, the single load cycle time is T, the cycle times are C, the magnetic resonance scanner selects a sagittal plane which is positioned in an inner compartment of the knee joint and is fully contacted with femur and tibia side cartilages to perform,
wherein the magnetic resonance scanner is a magnetic resonance test sequence employing a 3.0T magnetic resonance scanner with displacement encoding image processing:
wherein ,
as phase data, Δx is displacement variation, γ H Is gyromagnetic ratio, t enc For encoding gradient duration, G de Gradient magnitude, G 'for displacement encoding in the x or y direction on a plane' de Is the gradient size of the reference image.
2. The image forming apparatus according to claim 1, wherein: the top surface of the sickbed is of a strong friction structure.
3. The image forming apparatus according to claim 1, wherein: the foot sleeve is made of hard plastic.
4. The image forming apparatus according to claim 1, wherein: the displacement sensor is a laser displacement sensor.
5. The image forming apparatus according to claim 1, wherein: the fixing clamp is made of hard plastic.
6. The image forming apparatus according to claim 1, wherein: the displacement sensor is arranged on the outer wall of the cylinder.
7. The image forming apparatus according to claim 1, wherein: in step S200, F is 50% or 100% of the patient' S body weight, T is 5S or 10S, and c is 50 times, 100 times, or 200 times.
8. The image forming apparatus according to claim 1, wherein: in step S200, the encoding gradient of displacement encoding MRI is 0.33 pi/mm in 2 directions on a plane, and the TM buffer time of 600ms is set to ensure that MRI images are acquired in the loading platform period.
9. The image forming apparatus according to claim 1, wherein: in step S200, the TE time of the Single-shot fast spin echo sequence is 62/72/82ms, the TR time is 5000ms, the scanning FOV is 180×180mm, the matrix size is 256×256/384×384/512×512pixels, the layer thickness is 1mm, and the excitation times are 16 times.
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| CN202010056005.1A CN111227835B (en) | 2020-01-16 | 2020-01-16 | Dynamic knee joint imaging device and application method thereof |
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| CN202010056005.1A CN111227835B (en) | 2020-01-16 | 2020-01-16 | Dynamic knee joint imaging device and application method thereof |
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| CN105796101A (en) * | 2014-12-29 | 2016-07-27 | 中国科学院深圳先进技术研究院 | Tissue displacement measurement method and system based on magnetic resonance acoustic radiation force imaging |
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| WO2016100966A1 (en) * | 2014-12-19 | 2016-06-23 | New York Society For The Ruptured And Crippled Maintaining The Hospital For Special Surgery | System and apparatus for securing knee joint with a load for magnetic resonance imaging |
| CN108209920A (en) * | 2018-03-06 | 2018-06-29 | 吉林大学 | For the mechanics pressurized equipment of knee joint Magnetic resonance imaging during human body horizontal position |
| CN109480844B (en) * | 2018-12-27 | 2021-04-02 | 深圳先进技术研究院 | Method, device, equipment and storage medium for synchronously monitoring tissue displacement and temperature |
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| CN105796101A (en) * | 2014-12-29 | 2016-07-27 | 中国科学院深圳先进技术研究院 | Tissue displacement measurement method and system based on magnetic resonance acoustic radiation force imaging |
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