CN110123355B - Detection system - Google Patents
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- CN110123355B CN110123355B CN201910463774.0A CN201910463774A CN110123355B CN 110123355 B CN110123355 B CN 110123355B CN 201910463774 A CN201910463774 A CN 201910463774A CN 110123355 B CN110123355 B CN 110123355B
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- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 33
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910000978 Pb alloy Inorganic materials 0.000 description 1
- 229910001080 W alloy Inorganic materials 0.000 description 1
- 230000003187 abdominal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000002591 computed tomography Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- 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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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4476—Constructional features of apparatus for radiation diagnosis related to motor-assisted motion of the source unit
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Abstract
The present application provides a detection system. This detecting system includes detector, ray tube and shelters from the mechanism, and the ray tube is equipped with the focus axle, shelters from the mechanism including sheltering from the grid tray subassembly, shelters from the grid tray subassembly and includes: the support frame comprises two support vertical plates which are oppositely arranged, and the two support vertical plates are perpendicular to the focus shaft; the shielding grid plate is located between the two supporting vertical plates and arranged along the circumferential direction around the focus shaft, the two opposite sides of the shielding grid plate are movably connected with the two supporting vertical plates respectively, the shielding grid plate is provided with a plurality of adjusting through holes, and the adjusting through holes are used for reducing detector pixels detected by the detector. This application is through setting up the concrete structure of support frame, supports through supporting the riser promptly and shelters from the grid tray, and the rigidity countervailing rotatory centrifugal force through the high formation that supports the riser.
Description
Technical Field
The present application relates to a detection system.
Background
In the prior art, a CT system generally generates an image by emitting X-rays from a tube and detecting the X-rays emitted from the tube by a detector. At present, with the development of CT technology, higher requirements are put forward for the image quality of a CT system, wherein the image spatial resolution of the CT system has higher requirements, and the spatial resolution can be generally improved by reducing the size of a detector pixel unit of a detection system, and in addition, the spatial resolution can also be improved by shielding the detector pixel to be a small-sized detector pixel for acquisition.
The mode of acquiring the small-size detector pixels by shielding the detector pixels so as to improve the spatial resolution is mainly characterized in that a set of mechanism for partially shielding the detector pixels into the smaller-size pixels is arranged on a shell of a detection system, and the mechanism is hereinafter referred to as a shielding mechanism. Due to the space size limitation, the shielding mechanism is generally made into a flat arc shape, and the components are mostly made of die-cast aluminum alloy parts.
The shielding mechanism comprises a shielding grid plate, a plurality of groups of rectangular holes are formed in the shielding grid plate, the width of each rectangular hole is smaller than the width of a pixel of the detector, and the length of each rectangular hole can span several pixels and is used for improving the circumferential resolution ratio. During operation, when sheltering from the grid tray and moving to the detector top, rectangular hole and detector pixel coincidence on the grid tray of sheltering from except that the hole part corresponds the region, and remaining part X ray is sheltered from, and the pixel width who participates in scanning collection like this diminishes, can scan the image that generates higher spatial resolution through the algorithm cooperation.
The size of a pixel of the detector is directly reduced to improve the spatial resolution, corresponding cost is synchronously increased when more pixel units are needed in the same scanning range, and meanwhile, the size of the pixel is reduced, gaps among corresponding pixels are increased, so that the efficiency (the proportion of an effective area to the theoretical total area of the pixel) of the detector is reduced, and for scanning (for example, abdominal scanning) which does not need high spatial resolution, the scanning dose needs to be increased to compensate the influence of the reduction of the signal-to-noise ratio caused by the reduction of the efficiency.
The existing shielding mechanism is adopted, because space is limited, only thin-wall die castings can be adopted, the rigidity is poor, the processing cost is high, the centrifugal force generated by CT scanning rotation can reach more than 30g (the centrifugal force generated by the rotation of 1 kilogram of weight is 30 kilograms), and the requirements on the rigidity of components are high. In addition, as the number of CT layers increases, the width of the detector along the axial direction (Z direction) of the gantry also increases gradually, the movement range of the shielding mechanism along the Z direction needs to be larger, and the increase of the stroke of the shielding mechanism installed on one side of the detector housing along the Z direction needs to increase the size of the gantry along the Z direction.
Disclosure of Invention
The present invention provides a detection system that can increase the rigidity of a shielding mechanism to counter the centrifugal force generated by rotation.
To achieve the above object, an embodiment of the present invention provides a detection system. The detection system includes detector, ray tube and shelters from the mechanism, the detector is used for detecting the ray that the ray tube sent, it is used for the part to shelter from the detector to shelter from the mechanism, the ray tube is equipped with the focus axle, shelter from the mechanism including sheltering from the grid tray subassembly, it includes to shelter from the grid tray subassembly:
the supporting frame comprises two supporting vertical plates which are oppositely arranged, and the two supporting vertical plates are perpendicular to the focal axis;
the shielding grid plate is arranged between the two supporting vertical plates and arranged along the circumferential direction surrounding the focus shaft, two opposite sides of the shielding grid plate are movably connected with the two supporting vertical plates respectively, and the shielding grid plate is provided with a plurality of adjusting through holes which are used for reducing detector pixels detected by the detector.
Optionally, the shielding grid plate comprises a main body and fixing portions, the fixing portions are arranged on two sides of the main body, one end of each fixing portion is connected with the main body, and the other end of each fixing portion extends in the direction away from the main body.
Optionally, a positioning through hole is formed in the position, corresponding to the fixing portion of the shielding grid plate, of the supporting vertical plate, the fixing portion penetrates through the positioning through hole, and the fixing portion is in clearance fit with the positioning through hole.
Optionally, a hook portion is arranged at one end, away from the main body of the shielding grid plate, of the fixing portion of the shielding grid plate, and the hook portion is clamped on the outer periphery of the positioning through hole.
Optionally, the two supporting vertical plates are provided with positioning grooves, the fixing portion of the shielding grid plate is slidably arranged in the positioning grooves, and the fixing portion is in clearance fit with the positioning grooves.
Optionally, the support frame further comprises:
the first connecting plate is connected between the two supporting vertical plates and arranged along the circumferential direction;
the second connecting plate is connected between the two supporting vertical plates and arranged along the radial direction perpendicular to the focal axis, and one end of the shielding grid plate is inserted into the second connecting plate.
Optionally, the shielding mechanism further comprises a fine adjustment assembly, and the fine adjustment assembly is used for adjusting the position of the shielding grid plate relative to the support frame along the circumferential direction.
Optionally, the fine setting subassembly is manual fine setting subassembly, two manual fine setting subassembly is located respectively shelter from the both ends of grid tray, manual fine setting subassembly includes:
the differential head is fixed on the support frame through a differential head fixing seat;
the steering push plate is fixed on the support frame through a pin shaft and rotates around the pin shaft, an adjusting screw of the differential head abuts against one end of the steering push plate, and the other end of the steering push plate is used for pushing the shielding grid plate.
Optionally, the fine setting subassembly is electronic fine setting subassembly, electronic fine setting subassembly is located the one end of sheltering from the grid tray, electronic fine setting subassembly includes:
the adjusting motor is fixed on the supporting frame through a motor fixing seat;
the output shaft of the adjusting motor drives the eccentric wheel to rotate, and the outer peripheral edge of the eccentric wheel partially abuts against the inner peripheral edge of the driving hole in the shielding grid plate.
Optionally, the number of the shielding grid plates is two, the two shielding grid plates are stacked up and down, the two shielding grid plates move relatively along the circumferential direction, the width of the adjusting through hole of each shielding grid plate is larger than the distance between every two adjacent adjusting through holes, and the length direction of each adjusting through hole is parallel to the focal axis.
Optionally, the shielding mechanism further includes a driving assembly, and the driving assembly includes:
the guide rail is arranged along the direction of the focal axis, and the shielding grid plate assembly is arranged on the guide rail in a sliding manner through a connecting block;
a traction member disposed parallel to the guide rail;
and the driving motor drives the shielding grid plate assembly to move along the guide rail through the traction piece.
In the detection system of the above embodiment, the specific structure of the support frame is set, that is, the support vertical plate supports the shielding grid plate, and the rigidity formed by the height of the support vertical plate resists the rotating centrifugal force.
Drawings
Fig. 1 is a partial perspective view of a detection system according to embodiment 1 of the present invention.
Fig. 2 is a perspective view of a shielding mechanism according to embodiment 1 of the present invention.
Fig. 3 is a partially enlarged structural view of a portion a in fig. 2.
Fig. 4 is a schematic side view of a part of the shutter mechanism according to embodiment 1 of the present invention.
Fig. 5 is a schematic sectional view along the direction B-B in fig. 4.
Fig. 6 is a schematic partial plan view of the shielding mechanism according to embodiment 1 of the present invention.
Fig. 7 is a schematic sectional view along the direction C-C in fig. 6.
Fig. 8 is a side view schematically illustrating a supporting vertical plate according to embodiment 1 of the present invention.
Fig. 9 is a schematic top view of the shielding grid of example 1 of the present invention.
Fig. 10 is a partially enlarged structural view of a portion D in fig. 9.
Fig. 11 is a schematic side view of part of the shutter mechanism according to embodiment 2 of the present invention.
Fig. 12 is a schematic sectional view along the direction E-E in fig. 11.
Fig. 13 is a partial schematic top view of the shielding mechanism according to embodiment 2 of the present invention.
Fig. 14 is a schematic sectional view along the direction F-F in fig. 13.
Fig. 15 is a partially enlarged structural view of a portion G in fig. 14.
Fig. 16 is a schematic sectional view along H-H in fig. 14.
Fig. 17 is a schematic top view of the shielding grid of embodiment 2 of the present invention.
Fig. 18 is a partially enlarged schematic structural view of a portion I in fig. 17.
Description of the reference numerals
Shielding grid plate component 21
Supporting frame 211
Supporting vertical plate 2110
Locating through hole 2115
The shielding grid 212
Adjusting through hole 2121
Fixing part 2125
Manual fine adjustment assembly 22
Steering push plate 222
Differential head fixing seat 224
Adjusting screw 226
Drive assembly 23
Connecting block 24
Electric fine adjustment assembly 25
Focal axis O
Circumferential direction P
Radial direction R
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the terms "a" or "an" and the like in the description and in the claims of this application do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed after "comprises" or "comprising" is inclusive of the element or item listed after "comprising" or "comprises", and the equivalent thereof, and does not exclude additional elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "plurality" includes two, and is equivalent to at least two. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
Example 1
As will be understood in conjunction with fig. 1-10, the present embodiment provides a detection system 1. The detection system 1 of the present embodiment includes a detector, a ray tube, and a shielding mechanism 2. The detector is disposed relative to the tube and is configured to detect radiation emitted by the tube. The shielding mechanism 2 is positioned between the ray tube and the detector, and the shielding mechanism 2 is used for partially shielding the detector. The tube is provided with a focal axis O. In this embodiment, the radiation emitted by the tube is X-rays.
The shutter mechanism 2 includes a shutter grid assembly 21, a fine adjustment assembly and a drive assembly 23.
The shielding louver assembly 21 includes a support bracket 211 and a shielding louver 212. The shielding grid plate 212 is movably connected with the supporting frame 211.
The supporting frame 211 includes two supporting vertical plates 2110, a first connecting plate 2111 and a second connecting plate 2112 which are oppositely disposed.
Both supporting risers 2110 are perpendicular to the focal axis O. Thus, the two supporting risers 2110 support the shield grid 212, while the rigidity created by the height of the supporting risers 2110 opposes the rotational centrifugal force. The supporting vertical plate 2110 can be manufactured without casting and plate cutting, so that the process is simple and the cost is lower.
In this embodiment, the bottoms of the two supporting vertical plates 2110 are both in the shape of an arc, and the center of the arc is located on the focal axis O, but the invention is not limited thereto, and the bottom of the supporting vertical plate 2110 may also be in the shape of a broken line, or in other shapes. The first connection plate 2111 is connected between the two supporting risers 2110, and the first connection plate 2111 is disposed in the circumferential direction P around the focal axis O. The second connection plate 2112 is connected between the two supporting vertical plates 2110, the second connection plate 2112 is disposed along a radial direction R perpendicular to the focal axis O, and one end of the shielding grid plate 212 is inserted into the second connection plate 2112. The first connection plate 2111 and the second connection plate 2112 are each used to connect two supporting risers 2110, thereby achieving that the two supporting risers 2110 clamp the shielding grid 212 in the direction of the focal axis O. Furthermore, one end of the shielding grid plate 212 is inserted into the second connecting plate 2112, so that the shielding grid plate 212 can be limited.
The shielding grid plate 212 is located between the two supporting vertical plates 2110, the shielding grid plate 212 is arranged along the circumferential direction P surrounding the focal axis O, and two opposite sides of the shielding grid plate 212 are movably connected with the two supporting vertical plates 2110 respectively. Specifically, in the present embodiment, the shielding grids 212 may be disposed at the bottom of the supporting vertical plate 2110 along the circumferential direction P, but is not limited thereto, and the shielding grids 212 may also be disposed at the top of the supporting vertical plate 2110 or other positions as long as the effect of being disposed around the focal axis O can be achieved. The shielding grid 212 is provided with a plurality of adjusting through holes 2121, and the adjusting through holes 2121 are used for reducing the detector pixels detected by the detector. The thickness of the shielding grids 212 is 0.8mm to 1.2mm. The shielding grids 212 are flat plate structures. The shielding grid 212 is made of high-X-ray absorption materials such as tungsten, molybdenum, lead, tungsten alloy, molybdenum alloy and lead alloy. The shielding grids 212 are bent into an arc shape after being provided with the adjusting through holes 2121 and are assembled between the two supporting vertical plates 2110.
In the present embodiment, the adjustment through-hole 2121 includes a plurality of rectangular holes 2122 and a plurality of square holes 2123. The plurality of rectangular holes 2122 are equidistantly arranged along the circumferential direction P, the length direction of the rectangular holes 2122 is parallel to the focal axis O, and the width of the rectangular holes 2122 is smaller than the width of the detector pixels. The length of the oblong aperture 2122 is larger than the length of the detector pixels, in particular the length of the oblong aperture 2122 the detector pixels span several detector pixels for improving the resolution in the circumferential direction P.
The plurality of square holes 2123 are arranged in a rectangular array, the width direction of the rectangular array is parallel to the focal axis O, the length of each square hole 2123 is smaller than the length of each detector pixel, and the width of each square hole 2123 is smaller than the width of each detector pixel, so that the resolution in the circumferential direction P and the direction along the focal axis O can be improved simultaneously.
When the shielding grid plate assembly 21 moves above the detector, the rectangular holes 2122 or the square holes 2123 on the shielding grid plate 212 coincide with the pixels of the detector, except for the corresponding region of the hole part, the rest part of the X-rays are shielded, so that the width of the pixels participating in scanning and collecting is reduced, and the images with higher spatial resolution can be generated by scanning through the cooperation of the algorithm.
In other embodiments, the adjustment through-hole 2121 may include only the plurality of rectangular holes 2122 or only the plurality of square holes 2123. The shape of the adjustment through-hole 2121 is not limited herein. In addition, in FIG. 6, only one set of the adjustment through-holes 2121 of the shielding grids 212 is shown therein for clarity of the drawing.
The shielding grill 212 includes a body 2124 and fixing parts 2125, the fixing parts 2125 are disposed at both sides of the body 2124, one end of the fixing part 2125 is connected to the body 2124, and the other end extends away from the body 2124. The adjustment through hole 2121 is opened in the main body 2124.
The supporting upright 2110 is provided with a positioning through hole 2115 corresponding to the fixing portion 2125 of the shielding grid plate 212. In the present embodiment, the positioning through holes 2115 are arranged at the bottom of the supporting vertical plate 2110 along the circumferential direction P, but not limited thereto, and the positioning through holes 2115 may be arranged at the top of the supporting vertical plate 2110 or other positions corresponding to the arrangement of the shielding grids 212. Specifically, in the present embodiment, the positioning through holes 2115 are arranged in the circumferential direction P near the edge of the bottom of the circular arc shape of the support upright 2110. The center of the circular arc of the alignment of the positioning through-hole 2115 is located near the focal axis O or coincides with the focal axis O of the tube.
The fixing portion 2125 of the shielding grid 212 is inserted into the positioning through hole 2115 of the supporting upright 2110, and the fixing portion 2125 is in clearance fit with the positioning through hole 2115. Locating through-holes 2115, in clearance fit with the fixing portions 2125, define the relative position of the shield grid 212 to the support risers 2110.
The fixing portion 2125 of the shielding grid plate 212 is provided with a hook portion 2126 at an end thereof away from the main body 2124 of the shielding grid plate 212, and the hook portion 2126 is engaged with the outer periphery of the positioning through hole 2115.
During assembly, the shielding grid plate 212 is bent, and the fixing portion 2125 is inserted into the arc-shaped positioning through hole 2115 at the lower portion of the supporting upright 2110 and slides towards the direction close to the hook portion 2126, so that the hook portion 2126 is clamped on the outer periphery of the positioning through hole 2115, and the fixing portion 2125 and the positioning through hole 2115 form clearance fit, thereby controlling the shielding grid plate 212 to avoid outward deformation.
In other embodiments, the two supporting risers 2110 can also be movably connected by providing a positioning slot to be in clearance fit with the fixing portion 2125 of the shielding grid 212. The fixing portion 2125 of the shielding grid plate 212 is slidably disposed in the positioning groove, so as to control the shielding grid plate 212 to avoid outward deformation, and to adjust the position of the shielding grid plate 212 relative to the supporting vertical plate 2110 along the circumferential direction P.
The fine adjustment assembly is used for adjusting the position of the shielding grid plate 212 relative to the support bracket 211 along the circumferential direction P, so as to adjust the relative position of the shielding grid plate 212 and the detector pixel along the circumferential direction P. In this embodiment, the fine tuning assembly is a manual fine tuning assembly 22, two manual fine tuning assemblies 22 are respectively disposed at two ends of the shielding grid plate 212, and the manual fine tuning assembly 22 includes: a differentiation head 221, a steering pusher 222, and a knock-out pin 223.
The differential head 221 is fixed to the support frame 211 by a differential head fixing base 224. The knock pin 223 is wrapped around one end of the shielding grill 212. The turning push plate 222 is fixed to the support frame 211 through a pin 225, and the turning push plate 222 rotates around the pin 225, the adjusting screw 226 of the differential head 221 abuts against one end of the turning push plate 222, and the other end of the turning push plate 222 abuts against the top pin 223, so as to push the shielding grid plate 212 to adjust the position of the shielding grid plate 212 relative to the support frame 211 along the circumferential direction P. In other embodiments, the other end of the steering push plate 222 may abut against one end of the shielding grid plate 212 directly, i.e., the shielding grid plate 212 is pushed directly to adjust the position of the shielding grid plate 212 relative to the supporting frame 211 along the circumferential direction P.
When the manual fine adjustment assembly 22 is used, the differential head 221 is manually adjusted, so that the adjusting screw 226 pushes the steering push plate 222 to rotate around the pin shaft 225, the other end of the steering push plate 222 pushes the top pin 223, and the top pin 223 pushes the shielding grid plate 212 to move along the circumferential direction P to achieve fine adjustment of the position of the shielding grid plate 212, and the fine adjustment of the position ensures that the adjusting through holes 2121 on the shielding grid plate 212 are accurately aligned with the detector pixels. The reverse adjustment of the shield grid 212 is accomplished by another set of manual fine adjustment assemblies 22 also provided at the other end of the shield grid 212.
The drive assembly 23 is used to drive the shutter grid assembly 21 to move over the detector so that the shutter grid assembly 21 partially occludes the detector. The driving assembly 23 includes: a guide rail 231, a traction member 232, and a drive motor 233. The guide rail 231 is arranged along the direction of the focal axis O, and the shielding grid assembly 21 is slidably arranged on the guide rail 231 through the connecting block 24. The drawing member 232 is disposed parallel to the guide rail 231. The driving motor 233 drives the barrier fence assembly 21 to move along the guide rail 231 through the drawing member 232. In this embodiment, the pulling member 232 is a drive gear rack.
Referring to fig. 1, the shielding mechanism 2 and the detector are mounted together. By arranging the guide rails 231 of the drive assembly 23 directly on both sides of the housing 3 of the detection system 1, the range of motion of the shielding grid assembly 21 is greatly enlarged. In the high resolution mode, the driving motor 233 drives the barrier grid assembly 21 via the driving member to move along the guide rail 231 to above the detector.
The shielding mechanism can improve the resolution ratio of a CT space, and has the advantages of compact integral structure, simple processing and good rigidity; and the pixel shielding range can be dynamically adjusted based on the scanning requirement, so that different spatial resolution scanning is realized.
Example 2
As shown in fig. 11 to 18, the overall structure of the filter device of this embodiment is substantially the same as that of embodiment 1, except that the fine tuning assembly is a motor-driven fine tuning assembly 25, the motor-driven fine tuning assembly 25 is disposed at one end of the shielding grid 212, and the motor-driven fine tuning assembly 25 includes: adjusting motor 251 and eccentric 252.
The adjusting motor 251 is fixed to the supporting frame 211 through a motor fixing seat. The output shaft 253 of the adjustment motor 251 rotates the eccentric wheel 252, and the outer peripheral portion of the eccentric wheel 252 abuts against the inner peripheral edge of the driving hole 2127 of the shielding grid 212. The drive hole 2127 has an oblong shape. Thus, the shutter grid plate 212 is pulled to adjust the position in the circumferential direction P by the engagement of the eccentric 252 with the driving hole 2127.
The number of the shielding grid plates 212 is two, the two shielding grid plates 212 are stacked up and down, the two shielding grid plates 212 relatively move along the circumferential direction P, the width of the adjusting through holes 2121 of the shielding grid plates 212 is larger than the distance between the two adjacent adjusting through holes 2121, and the length direction of the adjusting through holes 2121 is parallel to the focal axis O. In addition, in FIG. 12, only one set of the adjustment through holes 2121 of the shielding grids 212 is shown therein for clarity of the drawing.
The relative position of the two shielding grid plates 212 can be finely adjusted along the circumferential direction P by the fine adjustment assembly, so that the relative position of the adjustment through holes 2121 on the two shielding grid plates 212 can be adjusted to change the size of the shielding area of the pixel, and different spatial resolution scans can be realized.
The electric fine adjustment assembly 25 is based on the working principle that the adjustment motor 251 drives the eccentric wheel 252 to rotate and pull the shielding grid plates 212 to adjust along the circumferential direction P, and the overlapping regions of the adjustment through holes 2121 of the two shielding grid plates 212 change along with the different positions of the shielding grid plates 212 to change the shielding width of the pixels along the circumferential direction P, so that the working area of the scanning pixels can be adjusted to realize different spatial resolution scans.
In the same shielding grid plate 212, the width of the adjusting through holes 2121 of the shielding grid plate 212 is larger than the distance between two adjacent adjusting through holes 2121, so that the shielding area can be enlarged. For example, the width of the adjustment through holes 2121 on the shielding grids 212 is set to be 0.8mm, the distance between two adjacent adjustment through holes 2121 is 0.5mm, the adjustment range that can be realized after the two shielding grids 212 are combined is 0.8-0.5=0.3mm, the maximum hole width is 0.8mm when the two are overlapped, that is, the pixel width scanning of the adjustment range from 0.3mm to 0.8mm can be realized after shielding. Therefore, the pixels can be shielded until the acquisition area is smaller than the standard pixel area, and the images with higher spatial resolution can be generated by scanning through algorithm cooperation.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (11)
1. A detection system, detection system includes detector, ray tube and shelters from the mechanism, the detector is used for detecting the ray that the ray tube sent, shelter from the mechanism and be used for the part to shelter from the detector, the ray tube is equipped with the focus axle, its characterized in that, shelter from the mechanism including sheltering from the grid tray subassembly, shelter from the grid tray subassembly and include:
the support frame comprises two support vertical plates which are oppositely arranged, and the two support vertical plates are perpendicular to the focus shaft;
the shielding grid plate is arranged between the two supporting vertical plates and is arranged along the circumferential direction surrounding the focus shaft, the two opposite sides of the shielding grid plate are movably connected with the two supporting vertical plates respectively, and the shielding grid plate is provided with a plurality of adjusting through holes which are used for reducing detector pixels detected by the detector.
2. The detection system of claim 1, wherein the shielding grid comprises a main body and fixing portions, the fixing portions are disposed on two sides of the main body, one end of each fixing portion is connected to the main body, and the other end of each fixing portion extends in a direction away from the main body.
3. The detecting system of claim 2, wherein the supporting vertical plate has a positioning hole corresponding to the fixing portion of the shielding grid plate, the fixing portion is disposed through the positioning hole, and the fixing portion is in clearance fit with the positioning hole.
4. The detecting system as claimed in claim 3, wherein a hook is provided at an end of the fixing portion of the shielding grid plate away from the main body of the shielding grid plate, and the hook is engaged with an outer periphery of the positioning through hole.
5. The detecting system according to claim 2, wherein the two supporting vertical plates are each provided with a positioning groove, the fixing portion of the shielding grid is slidably disposed in the positioning groove, and the fixing portion is in clearance fit with the positioning groove.
6. The detection system of claim 1, wherein the support frame further comprises:
the first connecting plate is connected between the two supporting vertical plates and is arranged along the circumferential direction;
the second connecting plate is connected between the two supporting vertical plates and arranged along the radial direction perpendicular to the focal axis, and one end of the shielding grid plate is inserted into the second connecting plate.
7. A detection system according to claim 1 wherein the shutter mechanism further comprises a fine adjustment assembly for adjusting the position of the shutter grid relative to the support frame in the circumferential direction.
8. The detection system according to claim 7, wherein the fine tuning assembly is a manual fine tuning assembly, two manual fine tuning assemblies are respectively disposed at two ends of the shielding grid plate, and the manual fine tuning assembly comprises:
the differential head is fixed on the support frame through a differential head fixing seat;
the steering push plate is fixed on the support frame through a pin shaft and rotates around the pin shaft, an adjusting screw of the differential head abuts against one end of the steering push plate, and the other end of the steering push plate is used for pushing the shielding grid plate.
9. The detection system of claim 7, wherein the fine tuning assembly is a motorized fine tuning assembly disposed at one end of the shielding grid, the motorized fine tuning assembly comprising:
the adjusting motor is fixed on the supporting frame through a motor fixing seat;
the output shaft of the adjusting motor drives the eccentric wheel to rotate, and the outer peripheral edge of the eccentric wheel partially abuts against the inner peripheral edge of the driving hole in the shielding grid plate.
10. The detection system according to claim 1, wherein the number of the shielding grids is two, two of the shielding grids are stacked up and down, and the two shielding grids relatively move along the circumferential direction, the width of the adjustment through holes of the shielding grids is larger than the distance between two adjacent adjustment through holes, and the length direction of the adjustment through holes is parallel to the focal axis.
11. The detection system of any one of claims 1-10, wherein the shielding mechanism further comprises a drive assembly, the drive assembly comprising:
the guide rail is arranged along the direction of the focal axis, and the shielding grid plate assembly is arranged on the guide rail in a sliding manner through a connecting block;
a traction member disposed parallel to the guide rail;
and the driving motor drives the shielding grid plate assembly to move along the guide rail through the traction piece.
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| JP2001042044A (en) * | 1999-07-29 | 2001-02-16 | Hitachi Medical Corp | X-ray detector and x-ray ct device using the same |
| JP2001212127A (en) * | 2000-02-03 | 2001-08-07 | Ge Yokogawa Medical Systems Ltd | X-ray ct system, its control method, and storage medium |
| JP3995914B2 (en) * | 2001-02-19 | 2007-10-24 | 株式会社日立メディコ | Rotating anode X-ray tube and X-ray CT apparatus using the same |
| US7742562B2 (en) * | 2007-06-27 | 2010-06-22 | Accuray Incorporated | Lower-torso assembly of a treatment couch useable in an X-ray environment |
| JP5081314B1 (en) * | 2011-05-23 | 2012-11-28 | 日立アロカメディカル株式会社 | X-ray generator |
| CN103489496B (en) * | 2013-09-10 | 2016-01-27 | 沈阳东软医疗***有限公司 | A kind of CT machine X ray collimator apparatus |
| CN103961131B (en) * | 2014-05-27 | 2015-12-30 | 赛诺威盛科技（北京）有限公司 | A kind of arc beam-defining clipper shielding plate structure |
| CN105266835A (en) * | 2014-07-25 | 2016-01-27 | Ge医疗***环球技术有限公司 | CT detector |
| EP3586752A4 (en) * | 2017-02-27 | 2020-12-16 | Nanovision Technology (Beijing) Co., Ltd. | Static real-time ct imaging system adaptable to large visual field requirementsand imaging method |
| CN207779916U (en) * | 2017-09-01 | 2018-08-28 | 中科慧远视觉技术（洛阳）有限公司 | A kind of cover board test device |
| CN108042149B (en) * | 2017-11-30 | 2021-06-29 | 上海联影医疗科技股份有限公司 | CT equipment and dust removal method thereof |
| CN108903963A (en) * | 2018-05-17 | 2018-11-30 | 北京纳米维景科技有限公司 | A kind of X-ray blocks component and its preceding collimator |
| CN208851509U (en) * | 2018-05-17 | 2019-05-14 | 北京纳米维景科技有限公司 | A kind of X-ray blocks component and its preceding collimator |
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