CN107693039B - X-ray detection device, cone-beam CT-systems and its imaging method - Google Patents
X-ray detection device, cone-beam CT-systems and its imaging method Download PDFInfo
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- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
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- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
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Abstract
The present invention relates to a kind of X-ray detection device, cone-beam CT-systems and its imaging methods.Above-mentioned X-ray detection device includes: X-ray emitter and multiple X-ray detectors；Each X-ray detector is movably disposed on the same side of detector bogey, it is arranged in parallel with detector bogey, the X-ray detector lays flat combination on detector bogey and forms the widened X-ray detector of projection data acquisitions area；Each X-ray detector is rebuild module with CT respectively and is connect, and the data for projection of acquisition is sent to CT respectively and rebuilds module, the CT rebuilds module and splice simultaneously CT image reconstruction for the data for projection that each X-ray detector acquires.By carrying out mobile combination to each X-ray detector, and image reconstruction is carried out using the data for projection of the detector acquisition after combination, it realizes and carries out imaging of the big visual field using the detector of small size, and obtained high-resolution CT image while expanding visual field.
Description
Technical field
The present invention relates to CT (Computed Tomography, CT scan) technical field of imaging, especially
It is to be related to a kind of X-ray detection device, cone-beam CT-systems and its imaging method.
Background technique
With the development of CT imaging technique, various CT equipments are constantly updated, and the detector in CT equipment is also research emphasis
One of.However, being subject to processing the limitation of the reasons such as technique and cost, it is generally the case that the bigger detector of size is differentiated
Rate is poorer, and so as to cause the spatial resolution decline of the CT image of object to be detected, details thickens, and seriously affects CT figure
Image quality amount.And for small size detector, although detector resolution is very high, it is restricted by size, the projection number of acquisition
According to limited, cause the CT image reconstructed that can only reflect fractional object fault information, can not be carried out using the detector of small size
The big high-resolution imaging in the visual field.
For example, cone-beam CT-systems use flat panel detector and cone type X-ray beam, multiple angles are carried out around scanned object
The exposure of degree carries out CT image reconstruction to these data for projection, obtains object to be detected to obtain many two-dimensional projection datas
3 d image data.The cone-beam CT-systems of traditional multi-detector, generally by the high-resolution for installing small size respectively
Rate detector and large-sized low resolution detector, switching selects one of detector to be imaged as needed, can only
The imaging of the high resolution small area visual field or the imaging of low resolution Large Area View are respectively obtained, visual field can not expanded
In the case of obtain high-resolution CT image.
Summary of the invention
Based on this, it is necessary to for asking for the high-resolution imaging in the big visual field can not be carried out using the detector of small size
Topic, provides a kind of X-ray detection device.
A kind of X-ray detection device, comprising: X-ray emitter and multiple X-ray detectors；
The ray receiving side of the X-ray detector is opposite with the radiation exit of X-ray emitter；
Each X-ray detector is movably disposed on the same side of detector bogey, with spy
It surveys device bogey to be arranged in parallel, the X-ray detector, which lays flat combination on detector bogey and forms data for projection, to be adopted
Collect the widened X-ray detector of area；
Each X-ray detector is rebuild module with CT respectively and is connect, and the data for projection of acquisition is sent to CT respectively
Module is rebuild, the CT rebuilds module and splice simultaneously CT image reconstruction for the data for projection that each X-ray detector acquires.
Above-mentioned X-ray detector, can be according to the demand of preset visual field to the X-ray on detector bogey
Detector carries out corresponding mobile combination, thus in the case where not reducing resolution ratio, according to the demand of visual field corresponding
Direction on increase data for projection acquisition area so that rebuild after CT image not only there is high-resolution again meet expansion the visual field
Demand.
In addition, the problem of also directed to that can not obtain high-resolution CT image at the big imaging visual field, provide one kind
Cone-beam CT-systems and its imaging method.
A kind of cone-beam CT-systems, comprising: scanning bracket, objective table, CT rebuild module and above-mentioned X-ray detection dress
It sets；
The scanning bracket is used to support the X-ray detection device；The objective table setting is filled in the X-ray detection
Between the X-ray emitter and X-ray detector set, for carrying object to be detected；The CT rebuilds module and penetrates with each X
Line detector connection splices each X-ray detector with the data for projection that difference lays flat combination acquisition, and according to
Spliced data for projection CT image reconstruction.
A kind of imaging method of conical beam CT realizes that the imaging method includes following based on above-mentioned cone-beam CT-systems
Step:
Mobile group is carried out to each flat panel detector on detector bogey according to the demand of preset visual field
It closes；
Data for projection of the X-ray after object to be detected is obtained using the X-ray detector after combination；
The data for projection is sent to CT image reconstruction module, in CT image reconstruction module, is calculated using analytic reconstruction
Method or iterative reconstruction algorithm rebuild the data for projection, obtain the CT reconstruction figure for meeting default visual field requirement
Picture.
The system and its imaging method of above-mentioned conical beam CT, according to different visual field demands, by being held to detector
It carries the multiple X-ray detectors set and carries out corresponding mobile combination, and utilize the projection number of the detector acquisition after combination
According to CT image reconstruction is carried out, visual field expansion can be obtained and resolution ratio and single size X-ray detector institute are attainable
The comparable CT image of resolution ratio obtains high-resolution CT image at the big imaging visual field to realize.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the X-ray detection device of one embodiment；
Fig. 2 is that the flat panel detector of one embodiment lays flat the schematic diagram of combination on detector bogey；
Fig. 3 is that the flat panel detector of another embodiment lays flat the schematic diagram of combination on detector bogey；
Fig. 4 is that the flat panel detector of another embodiment lays flat the schematic diagram of combination on detector bogey；
Fig. 5 is that the flat panel detector of further embodiment lays flat the schematic diagram of combination on detector bogey；
Fig. 6 shows the schematic diagram of the ray aperture position of the X-ray shutter of one embodiment；
Fig. 7 shows the schematic diagram of the ray aperture position of the X-ray shutter of another embodiment；
Fig. 8 shows the schematic diagram of the ray aperture position of the X-ray shutter of another embodiment；
Fig. 9 shows the schematic diagram of the ray aperture position of the X-ray shutter of further embodiment；
Figure 10 shows the flow chart of the imaging method of the conical beam CT of one embodiment；
Figure 11 shows the structural schematic diagram of the oral and maxillofacial surgery cone-beam CT-systems an of application example.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.
X-ray detection device of the invention can be applied in vertical CT scan system, horizontal CT scan system, based on rotation
In the CT system of the diversified forms such as the CT scan system of turntable.
The structural schematic diagram of the X-ray detection device of one embodiment is shown with reference to Fig. 1, Fig. 1, specifically includes that X-ray
Generator 100 and multiple X-ray detectors 201；The ray receiving side and X-ray emitter of the X-ray detector 201
100 radiation exit is opposite；Each X-ray detector 201 is movably disposed detector bogey 200
The same side on, be arranged in parallel with detector bogey, the X-ray detector 201 on detector bogey 200 put down
It puts combination and forms the widened X-ray detector of projection data acquisitions area；Each X-ray detector 201 is heavy with CT respectively
Block connection is modeled, the data for projection of acquisition is sent to CT respectively and rebuilds module, the CT rebuilds module for each X-ray detection
The data for projection of device acquisition splice and CT image reconstruction.
Wherein, the X detector can be the flat panel detector based on thin film transistor (TFT), putting down based on charge-coupled device
Partitioned detector or other be suitable for CT system flat panel detector etc.；The number at least two of the X-ray detector, shape
It can be rectangle, for example, can be as shown in Figures 2 to 5, two pieces of square flat panel detectors are selected, in practical applications,
The quantity for the detector selected can be adjusted according to the type of detector, or the visual field reached as needed requires selection rectangle
Detector.
Specifically, each X-ray detector is movably disposed on the same side of detector bogey, respectively
The ray receiving side of a X-ray detector is arranged in parallel with detector bogey, and the ray of each X-ray detector receives
At side in the same plane.
When the demand of visual field changes, each X-ray detector can pass through on detector bogey
Mobile to carry out laying flat combination accordingly, the ray receiving side of each X-ray detector after laying flat combination is still in same plane
It is interior, to form the widened X-ray detector of projection data acquisitions area；Wherein, the move mode of each X-ray detector is not
Limit, can be translation or rotation, as long as can be moved to each X-ray detector on position corresponding with combination i.e.
It can；The mode for driving each X-ray detector mobile can be manual actuation, can also be controlled by controller driving device from
And X-ray detector is pushed to be moved.
Each X-ray detector is rebuild module with CT respectively and is connect, and the data for projection of acquisition is sent to CT respectively
Module is rebuild, CT rebuilds module and splice simultaneously CT image reconstruction for the data for projection that each X-ray detector acquires；Wherein,
The reconstruction of CT image can be carried out using analytic reconstruction algorithm or iterative reconstruction algorithm.By being adopted to each X-ray detector
The data for projection of collection merges, and using the data for projection CT image reconstruction after merging, can obtain with the big imaging visual field
And resolution ratio and the single flat panel detector can reach the comparable high-resolution ct image of resolution ratio；Wherein, the big imaging
The visual field is the height for the opposite field of view obtained using single flat panel detector progress projection data acquisitions and after rebuilding
Resolution ratio is the resolution ratio of the large scale flat panel detector that can obtain same size visual field used relative to traditional technology
For.
Above-mentioned X-ray detector, can be according to the demand of preset visual field to the X-ray on detector bogey
Detector carries out corresponding mobile combination, thus in the case where not reducing resolution ratio, according to the demand of visual field corresponding
Direction on increase data for projection acquisition area so that rebuild after CT image not only there is high-resolution again meet expansion the visual field
Demand.
In one embodiment, the identical flat panel detector of two block sizes is set on the detector bogey；It is described
The vertical height of detector bogey lays flat the vertical height after combination, institute not less than two pieces of flat panel detectors along the vertical direction
The horizontal width for stating detector bogey lays flat the horizontal width after combination not less than two pieces of flat panel detectors in the horizontal direction,
The area of the detector bogey is at least four times of the flat panel detector area.
In the above-described embodiments, the identical flat panel detector of two block sizes can be high-resolution small size plate detection
Device, wherein described small size be for the area of detector bogey, due to detector bogey size not
The attainable maximum horizontal extent of less than two pieces combinations of detectors institutes and vertical height, so two pieces of detectors can be in above-mentioned spy
Survey the flexible mobile and various forms of independent assortments that device carries out all directions in the plane of detector bogey.
In one embodiment, such as Fig. 2, Fig. 2 shows the flat panel detectors of one embodiment in detector bogey
On lay flat the schematic diagram of combination, two flat panel detector 201a-201b can be on detector bogey 200 in the horizontal direction
Adjacent to lay flat combination, the vertical height of flat panel detector after combination is constant, and horizontal width is spliced into single flat panel detector 201a-
Twice of 201b horizontal width.By by two flat panel detector 201a-201b in the horizontal direction while with while be aligned and be adjacent to
It lays flat and combines, and combination acquired projections data are laid flat with this and carry out image reconstruction, horizontal direction can be obtained
The widened CT image of visual field.
In one embodiment, it is filled as Fig. 3, Fig. 3 flat panel detector for showing another embodiment are carried in detector
The schematic diagram for laying flat combination is set, two flat panel detector 201a-201b can be on detector bogey 200 along vertical side
Combination is laid flat to adjacent, the flat panel detector horizontal width after combination is constant, is highly spliced into single flat panel detector vertically
Twice of the vertical height of 201a-201b.By by two flat panel detector 201a-201b along the vertical direction while with while be aligned and phase
It lays flat and combines adjacently, and combination acquired projections data are laid flat with this and carry out image reconstruction, it is vertical to obtain
The widened CT image of direction visual field.
In one embodiment, it is filled as Fig. 4, Fig. 4 flat panel detector for showing another embodiment are carried in detector
The schematic diagram for laying flat combination is set, two flat panel detector 201a-201b are carried on detector bogey 200 along detector
First diagonal line of device 200 is adjacent to lay flat combination, the diagonal line of each flat panel detector 201a-201b point-blank,
And it is parallel with the first diagonal line of detector bogey 200.
In one embodiment, it is filled as Fig. 5, Fig. 5 flat panel detector for showing further embodiment are carried in detector
The schematic diagram for laying flat combination is set, two flat panel detector 201a-201b are carried on detector bogey 200 along detector
Second diagonal line of device 200 is adjacent to lay flat combination, the diagonal line of two flat panel detector 201a-201b point-blank,
And it is parallel with the second diagonal line of the detector bogey.
Specifically, two flat panel detector 201a-201b lay flat group along the first diagonal line of detector bogey 200
It closes, refers to that a flat panel detector 201a is placed in the second quadrant of detector bogey, another flat panel detector
201b is placed in the fourth quadrant of detector bogey, and the apex angle of two flat panel detector 201a-201b is opposite, diagonal line
It is on same straight line and parallel with the diagonal line of detector bogey 200；Two flat panel detector 201a-201b are along detection
Second diagonal line of device bogey 200 lays flat combination, refers to that a flat panel detector 201a is placed in detector bogey
In 200 first quartile, another flat panel detector 201b is placed in the third quadrant of detector bogey 200, and two is flat
The apex angle of partitioned detector 201a-201b is opposite, diagonal line of the diagonal line on same straight line and with detector bogey 200
In parallel.
By the way that two flat panel detectors are laid flat along the first diagonal line of detector bogey or the second diagonal line
Combination, and with this lay flat combination acquisition data for projection CT image reconstruction, can obtain vertically and horizontally at
As the widened CT image in the visual field.
If desired traditional technology obtains identical visual field and high-resolution CT image, need using one piece of area extremely
It is less the high resolution flat detector of four times of the flat panel detector area, and in four quadrants of detector bogey
Must all have detection array to carry out the acquisition of data for projection, one embodiment of the present of invention utilizes two small size high-resolution
Flat panel detector carries out laying flat combination, two pieces of small size plates along the first diagonal line of detector bogey or the second diagonal line
After detector is laid flat combination acquired projections data and rebuild with any one of them, visual field and four can be obtained
The identical high-resolution ct image of visual field of times area flat panel detector image obtained, reduces processing cost, more
The deficiency for having mended large scale high-resolution detector processing difficulties realizes under conditions of low cost, utilizes the spy of small size
It surveys device and obtains the big high-resolution CT reconstruction image in the visual field.
In one embodiment, X-ray shutter, X-ray can also be set in the radiation exit front end of X-ray emitter
Ray opening, the position of ray opening and the position of each X-ray detector on detector bogey are opened up on shutter
It is corresponding；Wherein, X-ray shutter can shield the material of X-ray using lead etc..
By opening up ray opening on the position opposite with X-ray detector, to the X for failing arrival X-ray detector
Ray is shielded, it is possible to reduce to the dose of radiation of object to be detected, avoids unnecessary radiation injury.
In one embodiment, the ray aperture position of the X-ray shutter of one embodiment is shown with reference to Fig. 6, Fig. 6
Schematic diagram, if two flat panel detectors are adjacent in the horizontal direction on detector bogey to lay flat combination, X-ray shutter
400 open up the first ray opening 401 in the horizontal direction, shape and two flat panel detectors of the first ray opening phase in the horizontal direction
The shape that neighbour lays flat after combination is similar, and ray openings of sizes can be according to ray with the ratio for laying flat the detector size after combining
Source focal position, distance, flat panel detector size or the ray source focus that radiographic source to ray is open to flat panel detector plane
The geometric parameters such as distance be configured；The horizontal irradiation that the X-ray on flat panel detector is reached by the first ray opening is wide
Degree is at least twice of single flat panel detector horizontal width, and vertical irradiation height is at least the vertical height of single flat panel detector
Degree.
In one embodiment, the ray opening position of the X-ray shutter of another embodiment is shown with reference to Fig. 7, Fig. 7
The schematic diagram set, if two flat panel detectors are adjacent along the vertical direction on detector bogey to lay flat combination, X-ray is blocked
Plate 400 opens up the second ray opening 402 along the vertical direction, and the shape of the first ray opening and two flat panel detectors are along the vertical direction
The adjacent shape laid flat after combining is similar；It is open by the second ray and reaches the vertical irradiation height of the X-ray on flat panel detector
Degree is at least twice of the single vertical height of flat panel detector, and the level that horizontal irradiation width is at least single flat panel detector is wide
Degree.
In one embodiment, the ray opening position of the X-ray shutter of another embodiment is shown with reference to Fig. 8, Fig. 8
The schematic diagram set, if two flat panel detectors are on detector bogey along the first diagonal line adjacent flat of detector bogey
Put combination, then X-ray shutter 400 the second quadrant corresponding with two flat panel detectors open up third ray opening 403 with
And fourth quadrant opens up the 4th ray opening 404；Shape and the single partitioned detector of third ray opening, the 4th ray opening
Shape is similar；It can at least be covered and be arranged in the second quadrant of detector bogey by the X-ray that third, the 4th ray are open
And the flat panel detector of fourth quadrant.
In one embodiment, the ray opening position of the X-ray shutter of further embodiment is shown with reference to Fig. 9, Fig. 9
The schematic diagram set, if two flat panel detectors are on detector bogey along the second diagonal line adjacent flat of detector bogey
Put combination, then X-ray shutter 400 first quartile corresponding with two flat panel detectors open up the 5th ray opening 405 with
And third quadrant opens up the 6th ray opening 406；Shape and the single partitioned detector of 5th ray opening, the 6th ray opening
Shape is similar；The X-ray being open by the five, the 6th rays, which can at least cover, to be arranged in detector bogey first quartile
And the flat panel detector of third quadrant.
In addition, the present invention also provides a kind of cone-beam CT-systems, with reference to the accompanying drawing to cone-beam CT-systems of the invention
It is described in detail.
In one embodiment, refering to what is shown in Fig. 1, cone-beam CT-systems specifically include that scanning bracket 301, objective table
500, CT rebuilds X-ray detection device described in module 700 and any of the above-described embodiment；The scanning bracket 301 is for branch
Support the X-ray detection device；The X-ray emitter 100 and X of the X-ray detection device is arranged in the objective table 500
Between ray detector 201, for carrying object to be detected；The CT rebuilds module 700 and connects X-ray detector 201, is used for
The data for projection of the object to be detected acquired according to X-ray detector 201 carries out CT image reconstruction.
Wherein, the scanning bracket can be vertical, objective table be seat or jaw support, scanning bracket be also possible to it is horizontal,
Objective table is scanning bed；Scanning bracket can be it is rotary, X-ray is driven by the rotating part of scanning bracket when scanning
Device, detector bogey and X-ray detector thereon are rotated around object to be detected, thus acquired projections data；It sweeps
It retouches bracket and is also possible to fixed, object to be detected rotation is carried to carry out the acquisition of data for projection by objective table when scanning.
CT, which rebuilds module, can be the computer except scanning bracket, is attached by cable, is also possible to install
Industrial personal computer in scanning bracket.Further, the CT, which rebuilds module, to carry out three to the image after CT image reconstruction
Tie up visualization processing.
It further, can also include: control device, the control device is used for the need according to preset visual field
It asks, controls each X-ray detector and lay flat combination, horizontal direction along the vertical direction in the plane where detector bogey
It lays flat combination or diagonal lays flat combination.
Specifically, control device receives the corresponding instruction for expanding visual field, according to order-driven motor, motor pushing
X-ray detector on detector bogey is moved and is correspondingly combined.
Further, control device can also control the switch of X-ray detector, so that control, which is in, carries out X-ray spy
Survey the number of the X-ray detector in working condition.It, can by controlling the number for the X-ray detector being in working condition
It is acquired with selection using a detector or is combined a variety of different acquisition modes such as acquisition using multiple detectors,
It is obtained with the CT image of a variety of visual fields of different sizes using a CT equipment, improves the utilization rate of equipment.
Further, the control device can also control X-ray emitter transmitting or stop transmitting X-ray, control is visited
The adjustment for surveying device bogey position, controls rotation or lifting of scanning bracket etc..
The system of above-mentioned conical beam CT, it is corresponding by being carried out to multiple X-ray detectors on detector bogey
Mobile combination, and CT image reconstruction is carried out using the data for projection of the detector acquisition after combination, visual field expansion can be obtained
The attainable comparable CT image of resolution ratio of big and resolution ratio and single size X-ray detector institute, to realize in great achievement
As obtaining high-resolution CT image in the case of the visual field.
In addition, the imaging method of the conical beam CT is based on upper the present invention also provides a kind of imaging method of conical beam CT
It states and realizes on the basis of cone-beam CT-systems described in any embodiment；The cone of one embodiment is shown with reference to Figure 10, Figure 10
The flow chart of the imaging method of pencil of forms CT, mainly comprises the steps that
Step S10: according to the demand of preset visual field to each flat panel detector on detector bogey into
The mobile combination of row.
Specifically, the expansion in the visual field corresponds to each plate detection on detector bogey on reconstruction image different directions
Device it is different lay flat combination, be moved to according to demand by the modes such as translating or rotate for each flat panel detector corresponding
On position.
Step S20: data for projection of the X-ray after object to be detected is obtained using the X-ray detector after combination.
Specifically, the X-ray detector after combination expands the area of projection data acquisitions, X-ray detector when scanning
Carry out the acquisition of data for projection simultaneously around object to be detected in the mode after combination.
Step S30: the data for projection is sent to CT image reconstruction module, in CT image reconstruction module, utilizes solution
Analysis algorithm for reconstructing or iterative reconstruction algorithm rebuild the data for projection, obtain the CT for meeting default visual field requirement
Reconstruction image.
In one embodiment, the demand according to preset visual field is to each flat on detector bogey
Partitioned detector carries out moving the step of combining
When setting expands the visual field of object to be detected vertical direction, the X-ray on detector bogey is visited
Device is surveyed to carry out laying flat combination along the vertical direction on detector bogey；
When setting expands the visual field of object to be detected horizontal direction, the X-ray on detector bogey is visited
Device is surveyed to carry out laying flat combination in the horizontal direction on detector bogey；
When being arranged while expanding the visual field both vertically as well as horizontally of object to be detected, by detector bogey
On X-ray detector carry out laying flat group along the first diagonal or the second diagonal on detector bogey
It closes.
The imaging method of above-mentioned conical beam CT, by carrying out phase to multiple X-ray detectors on detector bogey
The mobile combination answered, and CT image reconstruction is carried out using the data for projection of the detector acquisition after combination, imaging view can be obtained
Open country expands and the attainable comparable CT image of resolution ratio of resolution ratio and single size X-ray detector institute, to realize
High-resolution CT image is obtained in the case of the big imaging visual field.
In the following, being carried out more in conjunction with the application example that the present invention applies in oral and maxillofacial surgery cone-beam CT-systems to the present invention
Detailed elaboration.
The structural representation of the oral and maxillofacial surgery cone-beam CT-systems of an application example of the invention is shown with reference to Figure 11, Figure 11
Figure specifically includes that skeleton 300, the rotatable scanning bracket 301 that is arranged on skeleton, 301 one end of scanning bracket is arranged in
X-ray emitter 100 and the X-ray shutter 400 that 100 front end of X-ray emitter is arranged in are arranged another in scanning bracket
The detector bogey 200 at end and the multiple flat panel detectors being movably disposed on detector bogey
201, scanning bracket 301 is rotated centered on rotary shaft 302 around object to be detected；The system further includes being arranged in skeleton 300
On objective table 500 and control device 600, and the computer 700 connected with cable, for the progress of the data for projection of acquisition
Image reconstruction and three-dimensional visualization processing.
Two moveable small size high resolution flat detectors are set on the detector bogey, from pencil-beam
The direction of X-ray emitter is seen to detector bogey, obtains the broader information of object if necessary, then as shown in Fig. 2, two
A flat panel detector is adjacent in the horizontal direction to lay flat combination；The higher information of object is obtained if necessary, then as shown in figure 3, two
A flat panel detector is adjacent along the vertical direction to lay flat combination；If necessary to obtain the wider higher information of object simultaneously, then such as Fig. 4
Or shown in Fig. 5, two flat panel detectors are along the first diagonal line or second cornerwise direction is adjacent lays flat combination.
Correspondingly, if two flat panel detectors are adjacent in the horizontal direction to lay flat combination, X-ray shutter is as shown in Figure 6
Position on open up ray opening；If two flat panel detectors are adjacent along the vertical direction to lay flat combination, X-ray shutter is such as being schemed
Ray opening is opened up on position shown in 7；If two flat panel detectors lay flat combination along the first diagonal, X-ray is blocked
Plate opens up ray opening on position as shown in Figure 8；If two flat panel detectors lay flat combination, X along the second diagonal
Ray shutter opens up ray opening on position as shown in Figure 9, X-ray shutter to cannot reach the ray of detector into
Blocking is gone, to reduce the dose of radiation to object to be detected.
Control device can drive detector bogey close by control driving motor or far from scanning branch
The rotary shaft of frame moves, or direction moves horizontally or vertically in the plane where flat panel detector；Control device can be with
The acquisition of control flat panel detector or stopping collecting work, the rotation of control scanning bracket or movement etc..
Above-mentioned oral and maxillofacial surgery cone-beam CT-systems, according to different visual field demands, by detector bogey
On multiple X-ray detectors carry out corresponding mobile combination, and utilize the data for projection progress of the detector acquisition after combination
CT image reconstruction can obtain visual field expansion and the attainable resolution ratio of resolution ratio and single size X-ray detector institute
Comparable CT image obtains high-resolution CT image at the big imaging visual field to realize.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.Several implementations of the invention above described embodiment only expresses
Mode, the description thereof is more specific and detailed, and but it cannot be understood as the limitations to patent of invention range.It should be understood that
It is that for those of ordinary skill in the art, without departing from the inventive concept of the premise, several deformations can also be made
And improvement, these are all within the scope of protection of the present invention.Therefore, the scope of protection of the patent of the present invention should be with appended claims
It is quasi-.
Claims (10)
1. a kind of X-ray detection device characterized by comprising X-ray emitter, control device and multiple X-ray detections
Device；
The ray receiving side of the X-ray detector is opposite with the radiation exit of X-ray emitter；
Each X-ray detector is movably disposed on the same side of detector bogey, with detector
Bogey is arranged in parallel, and the X-ray detector lays flat combination on detector bogey and forms projection data acquisitions face
The widened X-ray detector of product；
The control device is used to detect each plate on detector bogey according to the demand of preset visual field
Device carries out mobile combination；
Each X-ray detector is rebuild module with CT respectively and is connect, and the X-ray detector after combination, which obtains X-ray, to be passed through
The data for projection of acquisition is sent to CT respectively and rebuilds mould by the data for projection after object to be detected, each X-ray detector
Block, the CT rebuild module and splice simultaneously CT image reconstruction for the data for projection that each X-ray detector acquires.
2. X-ray detection device according to claim 1, which is characterized in that further include: X-ray shutter, the X are penetrated
Line shutter is set to the radiation exit front end of X-ray emitter, and ray opening is opened up on the X-ray shutter, described to penetrate
The position of line opening is corresponding with the position of each X-ray detector on detector bogey.
3. X-ray detection device according to claim 1, which is characterized in that be arranged two on the detector bogey
The identical flat panel detector of block size；
The vertical height of the detector bogey lays flat perpendicular after combining along the vertical direction not less than two pieces of flat panel detectors
Straight height, after the horizontal width of the detector bogey lays flat combination not less than two pieces of flat panel detectors in the horizontal direction
Horizontal width, the area of the detector bogey are at least four times of the flat panel detector area.
4. X-ray detection device according to claim 3, which is characterized in that each flat panel detector is in detector
Adjacent in the horizontal direction on bogey to lay flat combination, the vertical height of the flat panel detector after combination is constant, horizontal width splicing
It is twice of single flat panel detector horizontal width；
Or each flat panel detector is adjacent along the vertical direction on detector bogey lays flat combination, plate is visited after combination
It is constant to survey device horizontal width, is highly spliced into twice of the vertical height of single flat panel detector vertically；
Or each flat panel detector on detector bogey along the first diagonal line adjacent flat of detector bogey
Combination is put, the diagonal line of each flat panel detector is point-blank, flat with the first diagonal line of the detector bogey
Row；
Or each flat panel detector on detector bogey along the second diagonal line adjacent flat of detector bogey
Put combination, the diagonal line of each flat panel detector point-blank, second pair of diagonal line and the detector bogey
Linea angulata is parallel.
5. a kind of cone-beam CT-systems characterized by comprising scanning bracket, objective table, CT rebuild module and aforesaid right
It is required that 1 to 4 described in any item X-ray detection devices；
The scanning bracket is used to support the X-ray detection device；The X-ray detection device is arranged in the objective table
Between X-ray emitter and X-ray detector, for carrying object to be detected；The CT rebuilds module and each X-ray is visited
Device connection is surveyed, each X-ray detector is spliced with the data for projection that difference lays flat combination acquisition, and according to splicing
Data for projection CT image reconstruction afterwards.
6. cone-beam CT-systems according to claim 5, which is characterized in that the control device be used for according to it is preset at
As the demand in the visual field, controls each X-ray detector and lay flat group along the vertical direction in the plane where detector bogey
It closes, horizontal direction lays flat combination or diagonal lays flat combination.
7. cone-beam CT-systems according to claim 6, which is characterized in that the control device is also used to control X-ray
The switch of detector, control are in the number for carrying out the X-ray detector in X-ray detection working condition.
8. cone-beam CT-systems according to claim 5, which is characterized in that the CT rebuilds module and is also used to CT image
Image after reconstruction carries out three-dimensional visualization processing.
9. a kind of imaging method of conical beam CT, which is characterized in that the cone-beam CT-systems based on any one of claim 6 to 8
Upper realization, the imaging method the following steps are included:
Mobile combination is carried out to each flat panel detector on detector bogey according to the demand of preset visual field；
Data for projection of the X-ray after object to be detected is obtained using the X-ray detector after combination；
The data for projection is sent to CT image reconstruction module, in CT image reconstruction module, using analytic reconstruction algorithm or
Person's iterative reconstruction algorithm rebuilds the data for projection, obtains the CT reconstruction image for meeting default visual field requirement.
10. the imaging method of conical beam CT according to claim 9, which is characterized in that described to be regarded according to preset imaging
Wild demand carries out the step of movement is combined to each flat panel detector on detector bogey
When setting expands the visual field of object to be detected vertical direction, by the X-ray detector on detector bogey
It carries out laying flat combination along the vertical direction on detector bogey；
When setting expands the visual field of object to be detected horizontal direction, by the X-ray detector on detector bogey
It carries out laying flat combination in the horizontal direction on detector bogey；
It, will be on detector bogey when being arranged while expanding the visual field both vertically as well as horizontally of object to be detected
X-ray detector carries out laying flat combination on detector bogey along the first diagonal or the second diagonal.
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| CN108652656B (en) * | 2018-05-21 | 2024-04-12 | 北京达影科技有限公司 | Composite detector, volume imaging system and method |
| CN109171788A (en) * | 2018-09-14 | 2019-01-11 | 合肥美亚光电技术股份有限公司 | Cone-beam CT-systems |
| CN110267033B (en) * | 2019-07-18 | 2022-06-14 | 江苏康众数字医疗科技股份有限公司 | Spliced flat panel detector and splicing method thereof, imaging system and imaging method thereof |
| CN114137001A (en) * | 2021-11-15 | 2022-03-04 | 上海博恩登特科技有限公司 | Oral impression imaging method based on oral CBCT system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101909522A (en) * | 2008-01-15 | 2010-12-08 | 威泰以友控股股份有限公司 | X-ray imaging apparatus |
| CN102038512A (en) * | 2009-10-23 | 2011-05-04 | 株式会社东芝 | X-ray diagnostic apparatus |
| CN102481132B (en) * | 2009-09-08 | 2015-02-25 | 皇家飞利浦电子股份有限公司 | Bidirectional movement assembly |
| CN102655809B (en) * | 2009-12-10 | 2015-06-17 | 皇家飞利浦电子股份有限公司 | Apparatus for phase-contrast imaging comprising a displaceable X-ray detector element and method |
| CN104244833B (en) * | 2012-03-26 | 2017-09-01 | 皇家飞利浦有限公司 | The direction controlling of x-ray focal spot movement |
-
2017
- 2017-11-14 CN CN201711123841.1A patent/CN107693039B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101909522A (en) * | 2008-01-15 | 2010-12-08 | 威泰以友控股股份有限公司 | X-ray imaging apparatus |
| CN102481132B (en) * | 2009-09-08 | 2015-02-25 | 皇家飞利浦电子股份有限公司 | Bidirectional movement assembly |
| CN102038512A (en) * | 2009-10-23 | 2011-05-04 | 株式会社东芝 | X-ray diagnostic apparatus |
| CN102655809B (en) * | 2009-12-10 | 2015-06-17 | 皇家飞利浦电子股份有限公司 | Apparatus for phase-contrast imaging comprising a displaceable X-ray detector element and method |
| CN104244833B (en) * | 2012-03-26 | 2017-09-01 | 皇家飞利浦有限公司 | The direction controlling of x-ray focal spot movement |
Non-Patent Citations (2)
| Title |
|---|
| 三维锥形束CT解析重建算法发展综述;曾凯，陈志强;《中国体视觉与图像分析》;20030630;第8卷(第2期);124-128 |
| 锥束CT图像重建算法;王本，王革;《CT理论与应用研究》;20010430;第10卷(第2期);1-8 |
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