CN106501288A - A kind of cone-beam CT-systems equipped with multi-detector - Google Patents
A kind of cone-beam CT-systems equipped with multi-detector Download PDFInfo
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- CN106501288A CN106501288A CN201611191136.0A CN201611191136A CN106501288A CN 106501288 A CN106501288 A CN 106501288A CN 201611191136 A CN201611191136 A CN 201611191136A CN 106501288 A CN106501288 A CN 106501288A
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Abstract
The present invention relates to a kind of cone-beam CT-systems equipped with multi-detector, including：Gantry, x ray generator, load carrier, controller, CT rebuild module, polylith planar array detector and detector switching device；The one piece of detector selected in polylith planar array detector is switched as needed by detector switching device, i.e., scanning only uses one piece of detector every time；The polylith planar array detector includes one piece of large area detector and one piece of high-resolution detector, when imaging of the big visual field is needed, large area detector may be selected；When high-resolution imaging is needed, the high-resolution detector of small pixel may be selected.The present invention can in cone-beam CT-systems integrated imaging of the big visual field and high-resolution imaging, and the existing solution of resolution ratio is higher.
Description
Technical field
The present invention relates to a kind of cone-beam CT-systems equipped with multi-detector, belong to computer tomography (CT).
Background technology
Conical beam CT is the X-ray CT system that a kind of use area array detector carries out three-dimensional imaging.System gantry, by
X ray generator, planar array detector, load carrier, controller, CT rebuild module composition.During scanning, x ray generator and spy
Survey device to rotate around checked object, obtain the data for projection of multiple different angles, module is rebuild by data for projection by CT then
It is converted into three-dimensional data.
Spatial resolution is the key technical index of cone-beam CT-systems, and the index depends on the combination of following factor：Visit
Survey device resolution, x-ray focus size, projection quantity, reconstruction Pixel Dimensions etc..Wherein, detector resolution is to determine system
One of most important factor of system spatial resolution.In the case where other configurations are constant, detector resolution is higher, the sky of system
Between resolution also higher.Limited by factors such as manufacturing process, acquisition rates, the higher detector of resolution, generally its imaging surface
Product is also less；Conversely, the bigger detector of imaging area, generally its resolution are poorer.Correspondingly, the higher taper of spatial resolution
Beam CT system, its visual field are relatively small；And the larger cone-beam CT-systems of visual field, its spatial resolution is relatively
Low.
However, user had often both needed big perimetry in actual applications, high-resolution inspection is needed again.With oral cavity
As a example by inspection, when oromaxillo-facial region totally inspection is carried out, larger visual field is needed；And carrying out the inspection of single tooth
When, then need very high spatial resolution.In other application, large-scale global-inspection is carried out using relatively low resolution,
The toposcopy that small range is carried out using higher resolution, and very common test mode.By the different visuals field of purchase, no
Different demands on examination can be met with the multiple stage cone-beam CT-systems of resolution, but cost is very high.How in a cone beam
Integrated imaging of the big visual field and high-resolution imaging in CT system, are difficult points of conical beam CT technical field.
Existing solution is on the basis of large view field cone beam CT systems to improve resolution, tool by optimizing sweep parameter
Body optimization method includes extending sweep time, increases projection data acquisitions frequency, reduces and rebuild Pixel Dimensions etc..Optimize scanning ginseng
Number can improve systemic resolution to a certain extent, but cannot break through the restriction of detector resolution.Therefore, anyway excellent
Change parameter, the spatial resolution of large view field cone beam CT systems is not as the low coverage conical beam CT system using high-resolution detector
System.
A kind of mouth X-ray machine with multiple detectors was mentioned in existing document, and wherein described multiple detectors are
Refer to linear array detector, planar array detector, two dimensional perspective imaging can be taken into account and three-dimensional cone beam CT is imaged, but can not be taken into account and regard greatly
Wild imaging and high-resolution imaging.
Content of the invention
The technology solve problem of the present invention：Overcome the deficiencies in the prior art, there is provided a kind of cone beam equipped with multi-detector
CT system, being capable of integrated imaging of the big visual field and high-resolution imaging, and the existing solution of resolution ratio in cone-beam CT-systems
Scheme is higher.
Technical scheme：A kind of cone-beam CT-systems equipped with multi-detector, including：Gantry, X ray occur
Device, load carrier, controller, CT rebuild module, it is characterised in that：Also include polylith planar array detector and detector switching dress
Put；The one piece of detector selected in polylith planar array detector is switched as needed by detector switching device, i.e., is scanned every time
One piece detector is only used；The polylith planar array detector includes one piece of large area detector and one piece of high-resolution detector,
When imaging of the big visual field is needed, large area detector may be selected；When high-resolution imaging is needed, the high-resolution of small pixel may be selected
Rate detector.Large area detector is comparatively, when two pieces of detectors in same system are in face with high-resolution detector
Product and Pixel Dimensions on variant when, then one of should be regarded as large area detector, another piece should be regarded as high-resolution detection
Device.
And, system can also install other detectors with specific function as needed, such as be used for power spectrum CT into
The detector of picture.
The gantry is vertical or horizontal.
The load carrier is seat, jaw support, scanning bed or turntable.
The switching mode of the detector switching device is parallel-moving type or rotary.
The handoff procedure can be motor-driven.
Present invention advantage compared with prior art is：
Due to being additionally mounted with one piece of high-resolution detector, the therefore resolution of cone-beam CT-systems proposed by the present invention
Be higher than existing only using one piece of big visual field detector system.And, system also supports that installing other as needed has
The detector of specific function, extends system imaging function.
A kind of mouth X-ray machine with multiple detectors was mentioned in existing document, and wherein described multiple detectors are
Refer to linear array detector, planar array detector, two dimensional perspective imaging can be taken into account and three-dimensional cone beam CT is imaged, but can not be taken into account and regard greatly
Wild imaging and high-resolution imaging.And technical scheme proposed by the present invention, the detector be for conical beam CT imaging face
Array detector, it is possible to resolve the problem of integrated high-resolution imaging in large view field cone beam CT systems.
Description of the drawings
Fig. 1 is cone-beam CT-systems schematic diagram (the vertical scanning of the employing jaw support as patient's bogey of the present invention
Frame)；
Fig. 2 is cone-beam CT-systems schematic diagram (the vertical scanning of the employing seat as patient's bogey of the present invention
Frame)；
Fig. 3 is the cone-beam CT-systems schematic diagram (horizontal gantry, bed are carried) of the present invention
Fig. 4 is the cone-beam CT-systems schematic diagram (gantry is fixed, and turntable rotates) of the present invention
Fig. 5 is parallel-moving type detector switching device, and upper figure is the state shot using 3-1 detectors, and figure below is to use 3-2
The state that detector shoots；
Fig. 6 is rotary detector switching device, and upper figure is the state shot using 3-1 detectors, and figure below is to use 3-2
The state that detector shoots.
Specific embodiment
As shown in Figure 1,2,3, 4, system of the present invention (including the standing part 1-1 of gantry, is scanned by gantry 1
The rotating part 1-2 of frame), x ray generator 2, polylith planar array detector (in figure, only illustrate large area detector 3-1 and high score
Resolution detector 3-2), detector switching device 4, load carrier 5, controller 6, CT rebuild module 7 constitute.
Gantry 1 is the main frame of system, the overall structure of decision systems, with supporting, motion and carries for miscellaneous part
For functions such as installation sites.The switching of x ray generator 2, large area detector 3-1, high-resolution detector 3-2 and detector
Device 4 is all arranged on gantry 1.In the system using x ray generator and planar array detector rotation sweep, X ray is sent out
Raw device 2 and large area detector 3-1, high-resolution detector 3-2 and detector switching device 4 are arranged on the rotation of gantry
On the 1-2 of part.Load carrier 5 is may be installed according to the difference of design, such as with seat or is swept
Retouch in the system that bed is load carrier, load carrier 5 can not be resided on gantry 1.The function of controller 6 is control system
In each moving component and x ray generator startup and stopping etc., be typically mounted on gantry.CT rebuilds the work(of module 7
Can process the data obtained in scanning process, be rebuild, generate three-dimensional CT images.It can be located at that CT rebuilds module 7
Computer outside gantry, is attached by cable, it is also possible to which (one kind specially sets the industrial computer being mounted on gantry 1
The computer of meter).
In polylith planar array detector, including one piece of large area detector 3-1, for imaging of the big visual field, it is generally used for big
The detector size of visual field imaging is not less than 13cm × 13cm, and the visual field for being formed is (high not less than 12cm (diameter) × 8cm
Degree), for global-inspection；Including one piece of high-resolution detector 3-2, for high-resolution imaging, high-resolution imaging is generally used for
Detector Pixel Dimensions be less than or equal to 100um, the visual field for being formed be less than or equal to 8cm (diameter) × 8cm (highly),
This it is imaged for carrying out local fine inspection；Detector with other features can be also installed as needed, tool is such as installed
There is the detector of X-ray energy spectrum resolution capability, for spectral imaging.Scanning only uses one piece of planar array detector, operator every time
Most suitable detector can be switched as needed.
It should be noted that " large area ", " high-resolution in above-mentioned " large area detector ", " high-resolution detector "
Comparatively rate " is all.As long as the area of two pieces of detectors, resolution are variant, you can it is large area to think one of
Detector, another piece is high-resolution detector.During such as following two pieces of detectors used in same conical beam CT imaging system,
One detector is large area detector 3-1, and another then belongs to high-resolution detector 3-2：
Large area detector 3-1：
Imaging area：13cm×13cm
Pixel Dimensions：120um
High-resolution detector 3-2：
Imaging area：12cm×12cm
Pixel Dimensions：99um
As shown in figure 1, system of the present invention can adopt vertical gantry structure, load carrier 5 to adopt jaw support.Scanning
When checked object motionless, by gantry rotating part 1-2 drive x ray generator 2, large area detector 3-1, high-resolution
Detector 3-2 is rotated around checked object, is scanned imaging.
As shown in Fig. 2 system of the present invention can adopt vertical gantry structure, load carrier 5 to adopt seat.Scanning
When checked object motionless, by gantry rotating part 1-2 drive x ray generator 2, large area detector 3-1, high-resolution
Detector 3-2 is rotated around checked object, is scanned imaging.
As shown in figure 3, system of the present invention using horizontal gantry structure, the rotating part 1-2 of gantry can be
Annular, the passage in the middle of annular are referred to as scan channel, and load carrier 5 is using scanning bed.During scanning, checked object is located at scanning bed
On, and scan channel is entered, checked object is motionless, drives x ray generator 2, large area to visit by the rotating part 1-2 of gantry
Survey device 3-1, high-resolution detector 3-2 to rotate around checked object, be scanned imaging.
As shown in figure 4, system of the present invention can adopt fixed gantry structure, load carrier 5 to adopt turntable.Sweep
When retouching, gantry 1 is maintained static together with x ray generator 2, large area detector 3-1, high-resolution detector 3-2, tested right
As being located on turntable, i.e. load carrier 5, checked object rotation is driven by turntable, imaging is scanned.
As shown in figure 5, the detector switching device 4 of system of the present invention can be designed using parallel-moving type.Carry out high score
When distinguishing imaging, high-resolution detector 3-2 alignments scanning center axle is imaged；When carrying out imaging of the big visual field, high-resolution is visited
Survey device 3-2 to translate to side, extremely with the non-overlapping positions of large area detector 3-1, large area detector 3-1 is directed at scanning center
Axle, is imaged.
As shown in fig. 6, the detector switching device 4 of system of the present invention can adopt swiveling design.Synchronization
Only one piece detector can be scanned imaging just to scanning center's axle and X ray incident direction；Detector switching device 4
After rotating to an angle, another piece of detector alignment scanning center's axle and X ray incident direction will be switched.Shown in Fig. 6 two
The situation of kind is respectively situation about being imaged using large area detector 3-1 and high-resolution detector 3-2, detector switching device 4
A kind of anglec of rotation when being switched to another kind of situation by situation is 180 degree.
Above example is provided just for the sake of the description purpose of the present invention, and is not intended to limit the scope of the present invention.This
The scope of invention is defined by the following claims.The various equivalents made without departing from spirit and principles of the present invention and repair
Change, all should cover within the scope of the present invention.
Claims (6)
1. a kind of cone-beam CT-systems equipped with multi-detector, including：Gantry, x ray generator, load carrier, controller,
CT rebuilds module, it is characterised in that：Also include polylith planar array detector and detector switching device；By detector switching device
Switching selects one piece of detector in polylith planar array detector as needed, i.e., scanning only uses one piece of detector every time；Described
Polylith planar array detector at least includes one piece of large area detector and one piece of high-resolution detector, when needing imaging of the big visual field
When, large area detector may be selected；When high-resolution imaging is needed, the high-resolution detector of small pixel may be selected.
2. a kind of cone-beam CT-systems equipped with multi-detector according to claim 1, it is characterised in that：The polylith face
Array detector can also extend, including one piece of detector with X-ray energy spectrum resolution capability.
3. a kind of cone-beam CT-systems equipped with multi-detector according to claim 1, it is characterised in that：The gantry
It is vertical or horizontal.
4. a kind of cone-beam CT-systems equipped with multi-detector according to claim 1, it is characterised in that：The carrying machine
Structure is seat, jaw support, scanning bed or turntable.
5. a kind of cone-beam CT-systems equipped with multi-detector according to claim 1, it is characterised in that：The detector
The switching mode of switching device is parallel-moving type or rotary.
6. a kind of cone-beam CT-systems equipped with multi-detector according to claim 1, it is characterised in that：Described switched
Journey can be motor-driven.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611191136.0A CN106501288A (en) | 2016-12-21 | 2016-12-21 | A kind of cone-beam CT-systems equipped with multi-detector |
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| CN201611191136.0A CN106501288A (en) | 2016-12-21 | 2016-12-21 | A kind of cone-beam CT-systems equipped with multi-detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020120083A1 (en) * | 2018-12-13 | 2020-06-18 | Intom GmbH | Industrial x-ray workpiece measuring system and method for operating same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020120083A1 (en) * | 2018-12-13 | 2020-06-18 | Intom GmbH | Industrial x-ray workpiece measuring system and method for operating same |
| US12203876B2 (en) | 2018-12-13 | 2025-01-21 | Intom GmbH | Industrial x-ray workpiece measuring system and method for operating same |
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Address after: 100084 A800B, 8 floor, Tsinghua Tongfang mansion, Tsinghua Yuan, Haidian District, Beijing Applicant after: Beijing Langshi Instrument Co.,Ltd. Address before: 100084, Beijing Haidian District Tsinghua Yuan, Tsinghua Tongfang building, 8 floor, A800B Applicant before: LARGEV INSTRUMENT Corp.,Ltd. |
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