CN206044646U - It is suitable to the CT machines of micro- pitch auger scanning - Google Patents
It is suitable to the CT machines of micro- pitch auger scanning Download PDFInfo
- Publication number
- CN206044646U CN206044646U CN201620663957.9U CN201620663957U CN206044646U CN 206044646 U CN206044646 U CN 206044646U CN 201620663957 U CN201620663957 U CN 201620663957U CN 206044646 U CN206044646 U CN 206044646U
- Authority
- CN
- China
- Prior art keywords
- frame
- swivel mount
- data processing
- screw
- examining table
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000013519 translation Methods 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims description 19
- 230000033001 locomotion Effects 0.000 claims description 14
- 238000007689 inspection Methods 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 230000005855 radiation Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002591 computed tomography Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 210000003027 ear inner Anatomy 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
Landscapes
- Apparatus For Radiation Diagnosis (AREA)
Abstract
This utility model is related to a kind of CT machines for being suitable to micro- pitch auger scanning，Including frame、Swivel mount、Examinating couch、Data handling system and control system，Mutual corresponding X-ray bulb and detector are installed on the swivel mount，The swivel mount is rotatably connected in the frame，The swivel mount is annular in shape，Centre is provided with longitudinal sense channel，The examinating couch is movably connected on examinating couch pedestal in the way of allowing both relative rectilinears to move，The rotating driving device、The control end of translation driving device and X-ray bulb connects the control system by wiredly and/or wirelessly mode，The signal output of the detector accesses the data handling system by wiredly and/or wirelessly mode，The data processing unit is the data processor and memorizer that image reconstruction can be carried out under software support，This utility model CT machines allow the helical scanning of minimum pitch，Be conducive to improving the longitudinal space resolution of reconstruction image.
Description
Technical Field
The utility model relates to a be suitable for micro-pitch helical scanning's CT machine.
Background
The existing CT machine comprises an X-ray beam emitting system, a detection system, a data processing system, an examining table and a control system, wherein an X-ray beam generated by an X-ray bulb tube passes through a human body and then forms an electric signal through a detector, and a CT image is formed after the electric signal is processed by the data processing system.
The X-ray scanning modes are various, different scanning modes are suitable for different detection requirements, the distribution of X-ray tubes and detectors in the X-ray scanning modes is different, and a mechanical framework and a mechanical transmission mechanism are also different, so that the CT machine with various characteristics in the prior art is formed.
In order to solve the problems of longitudinal resolution of CT images, simplified equipment construction, reduced equipment cost and optimized algorithm, the applicant provides a CT scanning mode and an image reconstruction method based on spiral scanning with a tiny pitch (also called a micro pitch), the method requires a radiation source and a detector unit of a CT machine to make spiral motion together during scanning to form a spiral scanning motion track, and the pitch needs to be about 1-2 times of the width of the detector unit, so that the development of the CT machine which is suitable for the requirement of the scanning motion track is needed.
SUMMERY OF THE UTILITY MODEL
Based on the development of scanning technique, the utility model provides a be suitable for micro-pitch helical scanning's CT machine, this kind of CT machine allows helical scanning to the pitch of helical scanning orbit is micro-pitch.
The technical scheme of the utility model is that: a CT machine suitable for micro-pitch helical scanning comprises a machine frame, a rotating frame, an examination bed, a data processing system and a control system, the rotating frame is provided with an X-ray bulb tube and a detector which are corresponding to each other, the rotating frame is rotatably connected on the stand, and is provided with a rotary driving device for driving the rotary frame to relatively rotate on the stand, the rotary frame is annular, the middle of the rotary frame is provided with an axial detection channel (the direction of a rotary axis), the examination bed is movably arranged on the examination bed base in a mode of allowing longitudinal movement, and is provided with a translation driving device for driving the examining table to move linearly relatively on the examining table base, the control ends of the rotation driving device, the translation driving device and the X-ray bulb tube are connected with the control system in a wired and/or wireless mode, the signal output of the detector is connected to the data processing system in a wired and/or wireless mode.
The utility model has the advantages that: the rotating frame can be driven to rotate and the examining table can be driven to translate (linearly move) through the rotating driving device and the translating driving device respectively, so that the detected human body can be translated longitudinally relative to the rotating frame through the examining table while the rotating frame is rotated and scanned under the control of an adaptive control system, the spiral scanning is decomposed into the control of two motion processes of rotation and translation, the overall structure of the equipment is simplified, the motion precision and the control precision of each part can be improved according to the prior art, and the required motion precision requirement can be still met under the condition of micro-pitch.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Detailed Description
Referring to fig. 1, the present invention provides a CT machine suitable for micro-pitch helical scanning, which comprises a frame 20, a rotating frame 10, a table 40, a data processing system and a control system, wherein the rotating frame is provided with an X-ray tube and a detector corresponding to each other, the rotating frame is rotatably connected to the frame, the frame is provided with a rotation driving device for driving the rotating frame to rotate relatively on the frame, the rotating frame is annular, the middle of the rotating frame is provided with a longitudinal (along the direction of the rotation axis) detection channel 11, the table is movably connected to a table base 30 in a manner allowing the two to move linearly relatively, the table base is provided with a translation driving device for driving the table to move linearly relatively on the table base, and the control ends of the rotation driving device, the translation driving device and the X-ray tube are connected to the control system in a wired and/or wireless manner, the signal output of the detector is connected to the data processing system in a wired and/or wireless mode.
The movable connection mode of the examination bed on the examination bed base can be a screw transmission mechanism connection, the screw transmission mechanism connection comprises a transmission screw 30 extending longitudinally and a transmission nut 41 screwed on the transmission screw, the transmission nut is fixedly connected with the examination bed, and the transmission screw is rotatably supported (a rotary connection mode which only allows the rotation along the axis of the screw and does not allow the axial movement along the screw) on the examination bed base.
The number of the screw transmission mechanisms is preferably at least two, wherein one screw transmission mechanism is positioned on the left side, and the other screw transmission mechanism is positioned on the right side, so that the movement is stable.
The nut on the same screw drive preferably comprises at least two screws, one for each screw, in order to achieve a stable movement.
Preferably be equipped with respectively on the screw rod with two driving gear of two driving motor's of forward and reverse output gear meshing, forward driving motor's output gear and forward driving gear meshing, reverse driving motor's output gear with reverse driving gear meshes, through this kind of drive mode, can eliminate the inspection bed and remove the in-process and lead to transmission error because of switching-over or pause etc. owing to certain fit clearance need be left between the transmission meshing gear, adopt forward and reverse motor to carry out the drive of equidirectional, can eliminate the error that this kind of fit clearance brought effectively.
The forward and reverse driving motors preferably adopt stepping motors so as to improve the moving precision and avoid accumulated errors.
The motor of the rotary drive is preferably a stepping motor.
The bottom of the base of the examination bed can be provided with rollers and fixing support legs for being fixedly supported on the ground so as to move through the rollers when the examination bed needs to be moved (moves together with the base of the examination bed), and after the position is determined, the examination bed is fixed on the ground through the fixing support legs so as to avoid the movement of the base of the examination bed in the detection process.
At least one of the roller and the fixed support leg is preferably connected with the base of the examination bed through a movable connecting support capable of adjusting the height, so that the roller is contacted with the ground when the examination bed needs to be moved, the fixed support leg is relatively lifted, the fixed support leg is contacted with the ground when the examination bed needs to be fixed, and the roller is lifted.
The rotating frame can be provided with a slip ring connecting device for electric connection or not, the slip ring connecting device mainly comprises a slip ring and a carbon brush contacted with the surface of the slip ring, the slip ring is arranged on the rotating frame, and the carbon brush is arranged on the rack.
The data processing device comprises a data processing unit (computer), a digital-analog/conversion circuit can be arranged between the data processing unit and the detector, the display output of the data processing unit can be connected with a display, the data processing unit is a data processor and a memory which can carry out image reconstruction under the support of software, therefore, analog information collected by the detector can be converted into electric signals so that the data processing unit can carry out data processing, the processed image information is sent to the display to be displayed and sent to the memory to be stored, and the data processing unit can also be provided with a network connection module for network access so as to be networked and realize interaction with a computer system of a medical institution.
The rotary frame and/or the rack are/is preferably provided with a rotary sensor capable of detecting rotation information of the rotary frame, the examination bed and/or the examination bed base is/are provided with a translation sensor capable of detecting translation signals of the examination bed, and the output of the rotary sensor and the translation sensor is connected to the data processing unit, so that motion errors can be obtained and counted, and the control precision and the calculation precision are improved.
The rotary frame and/or still preferably be equipped with in the frame and can detect the frame vibration sensor of rotary frame vibration, the inspection bed and/or still be equipped with on the inspection bed base and can detect the inspection bed vibration sensor of inspection bed vibration, the output of frame vibration sensor and inspection bed vibration sensor inserts data processing unit, from this, can count the position change that the vibration leads to, improve control accuracy and computational accuracy.
With the utility model discloses in carrying out the scanning of fine pitch, the following mode of permission adoption is carried out the image and is rebuild:
cartesian coordinates of the position in space of the point to be reconstructed in the imageTo identify that a radiation source and a detector unit rotate with a z-axis as a rotation central axis, an intersection point of a perpendicular line from a center of the radiation source to the detector unit and the rotation central axis is an origin O of the cartesian coordinate system,is in Cartesian coordinatesCorresponding cylinder coordinates, i.e.，Characterized by comprising the step of back-projecting: the coordinates required during the back-projection are calculated using the following formula：
；
Wherein,is the angle of rotation of the radiation source and the detector unit around the z-axis;
h is the pitch (i.e., the minimum pitch);
d is the distance from the center of the radiation source to the z-axis.
The CT machine image reconstruction method preferably adopts a formula (1) to obtain a reconstructed image:
； （1）
wherein the functionIs projection data acquired by a CT machineRepresentation, functionIs to project the projection dataWeighting and then filtering to obtain weighted and filtered projection data;is a fan angle formed by the connecting line of the X-ray source and the voxel point on the plane of the detector,
； （2）
； （3）
； （4）。
this way, compared to the normal axial scan mode, a degree of freedom is added, i.e. on the basis of the normal axial scan, a precise small linear displacement of the radiation source and the detector unit (i.e. the fine pitch H) relative to the scanned object along the central axis of rotation is generated, thereby introducing a larger amount of information into the data, thereby providing the possibility of improving the longitudinal resolution of the reconstructed image. Therefore, the invention can obviously improve the longitudinal spatial resolution of the image reconstructed by the CT machine on the premise of not changing the existing hardware equipment basically and not using the flying focus design, obviously improve the quality of the image in the case of needing higher longitudinal resolution (such as stent imaging, inner ear imaging and the like), and meanwhile, in the process of image reconstruction, not only can not cause the reconstructed image to generate artifacts, but also can obviously improve the longitudinal spatial resolution.
Claims (10)
1. The utility model provides a be suitable for micro-pitch helical scanning's CT machine, its characterized in that includes frame, swivel mount, inspection bed, data processing system and control system, install X ray bulb and the detector that corresponds each other on the swivel mount, swivel mount swivelling joint is in the frame, be equipped with in the frame and be used for the drive the swivel mount is in relative pivoted rotary drive device in the frame, the swivel mount is the ring-type, and the centre is equipped with fore-and-aft detection channel, the inspection bed is in order to allow the mode swing joint of two relative rectilinear movement on the inspection bed base, be equipped with on the inspection bed base and be used for the drive the inspection bed is in relative rectilinear movement's translation drive arrangement on the inspection bed base, rotary drive device, translation drive arrangement and X ray bulb's control end is connected through wired and/or wireless mode control system, the signal output of the detector is connected to the data processing system in a wired and/or wireless mode.
2. The CT machine according to claim 1, wherein the movable connection of the examination table to the examination table base is via a screw transmission mechanism, the screw transmission mechanism connection comprises a longitudinally extending transmission screw and a transmission nut screwed on the transmission screw, the transmission nut is fixedly connected with the examination table, and the transmission screw is rotatably supported on the examination table base.
3. The CT machine according to claim 2, wherein the number of screw driving mechanisms comprises at least two, one of which is located at the left side and the other of which is located at the right side, and the nuts on the same screw driving mechanism comprises at least two of front and rear.
4. The CT machine as claimed in claim 3, wherein said screw is provided with two forward and reverse drive gears respectively engaged with output gears of two forward and reverse drive motors, the output gear of said forward drive motor being engaged with said forward drive gear, and the output gear of said reverse drive motor being engaged with said reverse drive gear.
5. The CT machine according to claim 4, wherein the forward and reverse driving motors are step motors, and the motor of the rotary driving device is also a step motor.
6. The CT machine as claimed in claim 1, 2, 3, 4 or 5, wherein the examining table base is provided at a bottom thereof with rollers and fixing legs for fixedly supporting on the ground, at least one of the rollers and the fixing legs being connected to the examining table base by a movable connecting bracket capable of adjusting a height.
7. The CT machine according to claim 1, 2, 3, 4 or 5, wherein the rotating frame is provided with or without a slip ring connecting device for electrical connection, the slip ring connecting device mainly comprises a slip ring and a carbon brush contacting with the surface of the slip ring, the slip ring is mounted on the rotating frame, and the carbon brush is mounted on the frame.
8. The CT machine according to claim 1, 2, 3, 4 or 5, wherein said data processing device comprises an analog/digital conversion circuit, a data processing unit, a digital/analog conversion circuit and a display connected in sequence, said data processing unit is a data processor and a memory capable of image reconstruction under the support of software.
9. The CT machine according to claim 1, 2, 3, 4 or 5, wherein said rotating frame and/or said gantry is provided with a rotation sensor capable of detecting rotation information of said rotating frame, and said examining table and/or said examining table base is provided with a translation sensor capable of detecting translation signal of said examining table.
10. The CT machine of claim 1, 2, 3, 4 or 5, wherein the rotating frame and/or the frame is further provided with a frame vibration sensor capable of detecting the vibration of the rotating frame, and the examining table and/or the examining table base is further provided with an examining table vibration sensor capable of detecting the vibration of the examining table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620663957.9U CN206044646U (en) | 2016-06-29 | 2016-06-29 | It is suitable to the CT machines of micro- pitch auger scanning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620663957.9U CN206044646U (en) | 2016-06-29 | 2016-06-29 | It is suitable to the CT machines of micro- pitch auger scanning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206044646U true CN206044646U (en) | 2017-03-29 |
Family
ID=58372386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620663957.9U Active CN206044646U (en) | 2016-06-29 | 2016-06-29 | It is suitable to the CT machines of micro- pitch auger scanning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206044646U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114713518A (en) * | 2022-03-15 | 2022-07-08 | 江苏纳唯信息技术有限公司 | Intelligent flaw detection method for inner wall of industrial pipe fitting based on image analysis |
-
2016
- 2016-06-29 CN CN201620663957.9U patent/CN206044646U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114713518A (en) * | 2022-03-15 | 2022-07-08 | 江苏纳唯信息技术有限公司 | Intelligent flaw detection method for inner wall of industrial pipe fitting based on image analysis |
| CN114713518B (en) * | 2022-03-15 | 2024-05-14 | 江苏纳唯信息技术有限公司 | Intelligent flaw detection method for inner wall of industrial pipe fitting based on image analysis |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107515229B (en) | Multi-degree-of-freedom industrial X-ray tomography system | |
| US10405812B2 (en) | Extremity imaging apparatus for cone beam computed tomography | |
| JP4632891B2 (en) | X-ray CT imaging apparatus and X-ray CT imaging method | |
| CN101405619B (en) | Computed tomography data acquisition apparatus and method | |
| CN105873516B (en) | Head and neck imager | |
| EP2865335B1 (en) | Scanning system for three-dimensional imaging | |
| US7254216B2 (en) | Methods and apparatus for filtering a radiation beam and CT imaging systems using same | |
| JPH08238236A (en) | Ct apparatus | |
| JP2010259653A (en) | X-ray computer tomography device | |
| JPH10314153A (en) | X-ray picture device | |
| JP2001017421A (en) | Computerized tomograph | |
| WO2014065337A1 (en) | Bed for medical image diagnostic device and medical image diagnostic device | |
| CN101080652A (en) | Gantry system | |
| CN107157504B (en) | Control method for spiral CT scanning | |
| JP4573593B2 (en) | X-ray image correction method and apparatus | |
| CN206044646U (en) | It is suitable to the CT machines of micro- pitch auger scanning | |
| CN103126709B (en) | X-ray image diagnosis apparatus | |
| CN209153723U (en) | A kind of static horizontal computed tomographic scanner | |
| CN106097411A (en) | CT Scanner pattern, image rebuilding method and high resolution ct scanner unit | |
| US10307123B2 (en) | Tomosynthesis views from cone beam computed tomography data | |
| US11039799B2 (en) | Bearing system for cone beam computed tomography | |
| CN113303820B (en) | Compact CT detector image reconstruction method, reconstruction device and storage medium | |
| CN212281376U (en) | X-ray machine | |
| US7519142B2 (en) | Radiographic apparatus | |
| CN213046941U (en) | Suspension type fault fusion X-ray machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 110000 No.18, Shennong street, high tech Industrial Development Zone, Benxi City, Liaoning Province Patentee after: Liaoning Kaiying Medical Co.,Ltd. Address before: 117000, 18, Shen Nong Avenue, Benxi hi tech Industrial Development Zone, Liaoning, 8 Patentee before: SHENYANG KAMPO MEDICAL IMAGING TECHNOLOGY Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: CT machine suitable for micro pitch spiral scanning Granted publication date: 20170329 Pledgee: Benxi Bank Co.,Ltd. Beidi Branch Pledgor: Liaoning Kaiying Medical Co.,Ltd. Registration number: Y2024980020519 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |