CN106388847B - Central indication assembly, PET-CT mounting rack and alignment method of PET-CT mounting rack - Google Patents
Central indication assembly, PET-CT mounting rack and alignment method of PET-CT mounting rack Download PDFInfo
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- CN106388847B CN106388847B CN201610764353.8A CN201610764353A CN106388847B CN 106388847 B CN106388847 B CN 106388847B CN 201610764353 A CN201610764353 A CN 201610764353A CN 106388847 B CN106388847 B CN 106388847B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
- A61B6/035—Mechanical aspects of CT
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/037—Emission tomography
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4417—Constructional features of apparatus for radiation diagnosis related to combined acquisition of different diagnostic modalities
Abstract
The central indication assembly comprises a four-dimensional optical adjusting frame and a laser fixed in the middle of the four-dimensional optical adjusting frame, wherein a spectroscope is arranged at a laser emitting end of the laser, and a reflector is arranged at one side of the spectroscope; the included angle between the beam splitting mirror surface of the beam splitter and the laser emitted by the laser is 45 degrees, and the reflecting mirror surface of the reflecting mirror is opposite to the beam splitting mirror surface of the beam splitter, and the included angle is 90 degrees; after passing through the spectroscope, part of the emitted laser is emitted in the original direction, and the other part of the emitted laser vertically enters the reflector downwards; the laser entering the reflector is reflected and then emitted along the direction parallel to and opposite to the laser emitting direction of the laser, the structure is simple, the installation is flexible, the axle center of the CT rack is determined by adjusting the four-dimensional optical adjusting frame, the determining method is simple and effective, indication lasers in two opposite directions can be given, and meanwhile, the alignment indication is carried out on the bed body and the PET rack at two sides, so that the simultaneous alignment of the PET rack, the CT rack and the bed body can be realized.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to medical imaging equipment, and particularly relates to a multi-mode imaging system.
Background
The multi-modality imaging system may be used for scanning in a variety of modalities, such as Positron emission computed tomography (positrons EmissionTomography, PET), single Positron Emission Computed Tomography (SPECT), nuclear resonance imaging (MRI), computed tomography (ComputedTomography, CT), and the like.
In a multimode system (also called a polymorphic system), different scans are completed by using part of the same hardware, for example, PET-CT is realized by organically combining PET and CT, the same examination bed and the same image processing workstation are used, the PET-CT fusion image is formed by utilizing the inherent coincidence of PET and CT images, the PET-CT fusion image is formed by an image reconstruction fusion technology through the PET-CT fusion image, the pathophysiological change and morphological structure of a focus can be reflected at one time through one-time imaging, and the advantages of complementary advantages, high sensitivity, accuracy, high specificity, accurate positioning and the like are realized.
The above-mentioned inherent registration is based on the assumption that the coordinate systems of different imaging systems, such as PET and CT frames, are aligned, if the coordinate systems of different imaging systems are not aligned, the misregistration of the images may be directly caused, and the subsequent steps of image reconstruction cannot be performed, so that accurate image information cannot be provided.
Therefore, it is necessary to provide a mounting mechanism which is simple in structure, convenient to adjust and capable of well guaranteeing the coaxial requirements of different imaging systems.
Disclosure of Invention
The invention aims to provide a center indicating assembly, a PET-CT mounting rack and an alignment method thereof, which have the advantages of simple structure and convenient operation, can effectively ensure the coaxiality requirement of a PET detector and a CT rotation center, can realize the separation of different imaging systems, and brings convenience to the maintenance and the security inspection of equipment.
To achieve the above object, the solution of the present invention is:
the invention provides a center indicating assembly, which comprises a four-dimensional optical adjusting frame and a laser fixed in the middle of the four-dimensional optical adjusting frame, wherein a beam splitter is arranged at a laser emitting end of the laser, and a reflecting mirror is arranged at one side of the beam splitter;
the included angle between the beam splitting mirror surface of the beam splitter and the laser emitted by the laser is 45 degrees, and the included angle between the reflecting mirror surface of the reflecting mirror and the beam splitting mirror surface of the beam splitter is 90 degrees;
after passing through the spectroscope, part of the emitted laser is emitted in the original direction, and the other part of the emitted laser enters the reflecting mirror; the laser light entering the reflector is reflected and then emitted in the direction parallel and opposite to the laser light emitting direction of the laser.
Preferably, the center indicating assembly further comprises a beam splitter base, the beam splitter base is in a cuboid shape, one surface, close to the laser, of the beam splitter base is provided with a cuboid opening which penetrates through, the axis direction of the beam splitter base is perpendicular to the laser, and the beam splitter and the reflecting mirror are arranged in the cuboid opening;
the spectroscope base is also provided with a first laser outlet corresponding to the position of the spectroscope, and light transmitted by the spectroscope is emitted through the first laser outlet;
preferably, the center indicating assembly further comprises a spectroscope fixture, the spectroscope base is arranged in the spectroscope fixture, the spectroscope fixture is of a door-shaped structure and comprises a laser access plate perpendicular to the laser emission arrangement, and a positioning plate which is positioned at the upper end and the lower end of the laser access plate and is vertically connected with the laser access plate;
the laser inlet and the second laser outlet are arranged on the laser inlet and outlet plate, and after the laser emitted by the laser enters the spectroscope through the laser inlet, the laser reflected by the spectroscope is reflected again through the second laser outlet after passing through the reflector.
Preferably, the center indicating assembly is a center indicating assembly of the CT frame, the center indicating assembly further comprises a laser bracket base plate fixedly connected with the spectroscope base, the laser bracket base plate is strip-shaped plate-shaped, the spectroscope base is fixed in the middle of the laser bracket base plate, and the laser bracket base plate is located on any diameter of a detector ring of the CT frame and two ends of the laser bracket base plate are fixedly connected with the CT frame.
The invention provides a PET-CT mounting rack, which comprises a PET imaging system alignment adjusting device, a multi-mode imaging center indicating assembly and a bed body, wherein the center indicating assembly is arranged between the PET imaging system alignment adjusting device and the bed body and is used for indicating the PET imaging system alignment adjusting device and the bed body to perform center alignment; the multi-mode imaging center indicating assembly is arranged on the CT frame; a center alignment plate is arranged on the bed body;
the PET imaging system alignment adjusting device is arranged at the transmission laser output end of the spectroscope of the central indicating assembly, and the PET imaging system alignment adjusting device performs central alignment adjustment of the PET stand and the CT stand according to the central indicating assembly;
the center alignment plate of the bed body is used for center adjustment of the bed body and the CT stand, the number of the center alignment plate is two, the center adjustment plate is respectively arranged at the upper ends of the head and the tail of the bed body, the center alignment plate of the bed body is provided with a second oblong hole with the axial direction parallel to the horizontal plane direction, and the long side direction of the second oblong hole is perpendicular to the horizontal plane direction.
Preferably, the alignment adjustment device of the PET imaging system comprises two target frames which are arranged perpendicular to a horizontal plane and a main support mechanism for mounting and fixing the target frames or the PET machine frame;
the two target frames are parallel to each other, and the direction of the connecting line of the target center indicates the direction of the axis of the alignment regulating device of the PET imaging system;
the main support mechanism comprises an adjusting base and a frame bottom plate which is arranged on the adjusting base and used for installing and fixing the target frames or the PET frame, and the adjusting base is controlled to adjust the distances between different positions of the frame bottom plate and the ground so that the target centers of the two target frames are overlapped with the central shafts of other imaging systems;
the PET rack is arranged on the main supporting mechanism after adjustment.
Preferably, the upper ends of the two target frames are provided with a first oblong hole and a round hole plate provided with a round hole, and the round hole plate is detachably connected with the target frames;
preferably, the round hole plate and the plate surface of the target frame are arranged in parallel and are perpendicular to the horizontal plane, and the round hole plate is arranged on any side of the target frame;
preferably, when the circular hole plate is fixed on the target frame, the circular hole is communicated with the first oblong hole and is arranged at the center of the first oblong hole; the axial direction of the round hole and the first oblong hole is parallel to the horizontal plane direction, and the long side direction of the first oblong hole is the direction vertical to the horizontal plane.
Preferably, the adjusting base comprises at least one group of symmetrically arranged rolling bearings arranged on the lower bottom surface.
Preferably, the adjusting base comprises at least four height adjusting bearings arranged around;
the two ends of the adjusting base are respectively provided with a fixed plate which is positioned below the bottom plate of the stand and is parallel to the horizontal plane, and the height adjusting bearing penetrates through and is movably fixed on the fixed plate and is vertical to the horizontal plane;
rotating each height adjusting bearing to change the distance between the bottom plate of the frame and the ground at the position of the point;
preferably, the height adjusting bearing comprises a base and a supporting column, wherein the supporting column is a hexagon bolt with a lower end provided with a bulge along the horizontal direction;
the upper end of the base is provided with an opening, the width of the opening is larger than that of the column of the hexagonal bolt and smaller than that of the bulge;
a thrust ball bearing is arranged in the base;
the support column passes through the opening of the base and is arranged above the base, the upper end of the protrusion is contacted with the inner cover of the base, and the lower end of the protrusion is arranged on the thrust ball bearing;
preferably, the support column is connected with the fixing plate through threads.
The invention provides an alignment method of a PET-CT mounting rack, which comprises the following steps: the method is characterized in that: the method comprises the following steps:
step 1, determining the position of the central indicating component of the CT rack;
step 2, aligning the axes of the PET stand and the CT stand by taking the central indication assembly as a reference;
and 3, aligning the axes of the CT frame and the bed body by taking the central indication assembly as a reference.
Preferably, the step 1 includes:
step 1-1, fixing two ends of a laser bracket bottom plate of the center indicating assembly on the CT frame, so that the laser bracket bottom plate is arranged on any diameter of a detector ring of the CT frame;
step 1-2, arranging a plate parallel to the CT frame on the first laser outlet emission side of the central indication assembly;
step 1-3, rotating a detector ring of the CT frame, and adjusting a four-dimensional optical adjusting frame to ensure that the spot position of laser emitted by a laser irradiated on the plate is unchanged;
step 1-4, rotating a detector ring of the CT frame to enable a laser inlet to be positioned right above or right below a second laser outlet;
preferably, the step 2 includes:
step 2-1, arranging the PET imaging system on the first laser outlet emission side of the central indicating assembly, adjusting the height of each height adjusting bearing of the alignment adjusting device of the PET imaging system, enabling the base not to contact with the ground, detaching the round hole plate from the target frame, pushing the PET imaging system to move in the horizontal direction by virtue of the rolling bearing, and enabling the axle center of the central indicating assembly to pass through the first oblong holes of the two target frames;
step 2-2, adjusting the height of each height adjusting bearing to enable the base of each height adjusting bearing to be placed on the ground;
step 2-3, mounting a circular hole plate on the target frame, and adjusting the height of each height adjusting bearing to enable the axle center of the central indicating assembly to pass through the circular holes of the two target frames;
step 2-4, detaching the target frame from the main supporting mechanism, and mounting the PET frame on the main supporting mechanism;
preferably, the step 3 includes: and arranging the PET imaging system at the third laser outlet emission side of the central indication assembly, and adjusting the left-right displacement of the bed body to enable the laser emitted by the third laser outlet to pass through the two second oblong holes.
By adopting the scheme, the invention has the beneficial effects that:
the center indicating assembly provided by the invention is simple in structure, flexible to install, and simple and effective in determining method by adjusting the four-dimensional optical adjusting frame to determine the axle center of the CT rack. And as the central indication component of CT frame, when other structures align with CT frame center according to this central indication component according to actual need, can give the indication laser of relative two directions, carry out the alignment to the bed body of both sides and PET frame simultaneously and instruct, can realize the simultaneous alignment of PET frame, CT frame and bed body for alignment time has improved work efficiency.
According to the PET-CT mounting rack and the alignment method thereof provided by the invention, the central indication component arranged on the CT rack can simultaneously emit central indication lasers towards the bed body and two sides of the PET rack, the central indication lasers emitted towards the PET rack side are in the central direction of the CT rack in consideration of actual demands, the central indication lasers emitted towards the bed body side are positioned right above and right below the central direction of the CT rack, and three parts can be simultaneously aligned, so that the alignment time is shortened, and the working efficiency is improved. The PET imaging system alignment adjusting device is simple and convenient to move, and can be aligned by using linear laser through the movably connected round hole and the oblong hole: after the alignment in the horizontal direction is realized in the horizontal moving process, the alignment in the vertical direction is regulated and realized; realize adjusting function's regulation base, simple structure is through setting up the altitude mixture control bearing in the four corners position to change the altitude mixture control bearing's of fixed plate lower extreme altitude mixture control bearing highly, and then change main support mechanism and be provided with the altitude mixture control bearing's of this altitude mixture control bearing each point the different positions of frame bottom plate and the distance on ground, can realize center alignment regulation, altitude mixture control bearing makes the adjustment process simple swiftly a few.
Drawings
FIG. 1 is an exploded view of one embodiment of a center indicating assembly provided by the present invention;
FIG. 2 is a perspective view of an embodiment of a PET-CT mounting gantry provided by the present invention;
FIG. 3 is a side view of an embodiment of a PET-CT mounting gantry provided by the present invention;
FIG. 4 is a schematic view of a structure in which a bed center alignment plate according to an embodiment of the present invention is disposed on a bed;
FIG. 5 is a schematic diagram of an embodiment of an alignment adjustment device for a PET imaging system provided by the present invention;
FIG. 6 is an enlarged view of a portion A of FIG. 5 in accordance with the present invention;
FIG. 7 is an enlarged view of a portion B of FIG. 5 in accordance with the present invention;
FIG. 8 is a bottom view of an embodiment of an adjustment base provided by an embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of a height adjustment bearing coupled to a mounting plate according to an embodiment of the present invention;
the center indicating assembly 200, the four-dimensional optical adjustment frame 210, the beam splitter 220, the reflecting mirror 230, the beam splitter base 240, the first laser outlet 241, the beam splitter fixture 250, the laser inlet 251, the second laser outlet 252, the adjustment frame base 260, the third laser outlet 261, the laser support base 270, the laser 280, the bed center alignment plate 300, the second oblong hole 310, the PET imaging system alignment adjustment device 100, the target frame 110, the first oblong hole 111, the circular hole 112, the circular hole plate 113, the main support mechanism 120, the adjustment frame 121, the frame base 122, the rolling bearing 123, the height adjustment bearing 124, the base 1241, the support post 1242, the protrusion 1243, the opening 1244, the thrust ball bearing 1245, and the fixing plate 125.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In order to illustrate the technical scheme of the invention, the following description is made by specific examples.
Example 1
An embodiment of the present invention provides a schematic structural diagram of a center indicating assembly, as shown in fig. 1, which is an exploded view of an embodiment of the center indicating assembly of the present invention, as can be seen from fig. 1, the center indicating assembly 200 includes a four-dimensional optical adjusting frame 210 and a laser 280 fixed in the middle of the four-dimensional optical adjusting frame 210, a beam splitter 220 is disposed at a laser emitting end of the laser 280, and a reflector 230 is disposed at a lower side of the beam splitter 220.
The beam splitter 220 has a beam splitter mirror facing downward and having an angle of 45 ° with respect to the horizontal, and the laser beam passes through the beam splitter 220, and then, a part of the laser beam is emitted in the original direction, and a part of the laser beam vertically enters the mirror 230.
The mirror surface of the mirror 230 is oriented upward at an angle of 45 ° to the horizontal, and the laser light entering the mirror 230 is reflected and then emitted in a direction parallel to and opposite to the direction of the laser light emitted from the laser 280.
Specifically, the beam splitter 220 may be a beam splitter prism, as can be seen from fig. 1, the center indicating assembly 200 further includes a beam splitter base 240 and a beam splitter fixture 250, the beam splitter 220 and the beam splitter 230 are disposed on the beam splitter base 240, the beam splitter base 240 is disposed in the beam splitter fixture 250, the beam splitter base 240 is in a cuboid shape, one surface of the beam splitter base 240, which is close to the laser 280, has a cuboid opening that penetrates through and is perpendicular to a horizontal plane, the beam splitter 220 and the beam splitter 230 are disposed in the opening up and down, a first laser outlet 241 corresponding to the position of the beam splitter 220 is further disposed on the beam splitter base 240, and light transmitted from the beam splitter 220 is emitted through the first laser outlet 241.
The beam splitter 250 has a portal structure and comprises a laser access plate arranged on a vertical horizontal plane and a positioning plate positioned at the upper end and the lower end of the laser access plate and vertically connected with the laser access plate. The laser inlet and outlet plate is provided with a laser inlet 251 and a second laser outlet 252, and after the laser emitted by the laser 280 enters the spectroscope 220 through the laser inlet 251, the laser reflected from the spectroscope 220 is reflected again through the second laser outlet 252 after passing through the reflector 230.
Further, the center indicating assembly further includes an adjusting frame base 260, the lower ends of the four-dimensional optical adjusting frame 210 and the beam splitter base 240 are sequentially fixed on the adjusting frame base 260, the adjusting frame base 260 is a plate with a protrusion at one end, the four-dimensional optical adjusting frame 210 is disposed at the upper end of the protrusion, and the protrusion is further provided with a third laser outlet 261 corresponding to the second laser outlet 252.
The center indicating assembly further includes a laser support base plate 270 fixedly connected to the beam splitter base 240, the laser support base plate 270 is in a shape of a strip plate, the beam splitter base 240 is fixed in the middle of the laser support base plate 270, and the laser support base plate 270 is located on any diameter of the CT frame detector ring and two ends of the laser support base plate 270 are fixedly connected to the CT frame.
In a specific test process, the fixing method of each module of the central indication assembly comprises the following steps: the beam splitter 220 and the reflecting mirror 230 are sequentially adhered or clamped in the rectangular opening of the beam splitter base 240, and the position of the beam splitter 220 corresponds to the first laser outlet 241. Two symmetrical first screw holes are formed in two sides of the rectangular opening of the spectroscope base 240, a second screw hole corresponding to the first screw hole is formed in the laser access plate of the spectroscope clamp 250, the spectroscope base 240 is fixed in a door-shaped structure of the spectroscope clamp 250, and screws penetrate through the second screw hole and the first screw hole to fix, so that the whole spectroscope 220, the reflecting mirror 230, the spectroscope base 240 and the spectroscope clamp 250 are assembled into a cuboid shape. The beam splitter base 240 is provided with a first laser outlet 241, two pairs of third screw holes are symmetrically arranged on two sides of the first laser outlet 241, a fourth screw hole corresponding to the four third screw hole is arranged on the laser bracket bottom plate 270, and screws penetrate through the fourth screw hole and the third screw hole to integrally fix the whole beam splitter 220, the reflecting mirror 230, the beam splitter base 240 and the beam splitter clamp 250 on the laser bracket bottom plate 270. The protrusion and the other side of the adjusting frame base 260 are respectively provided with a fifth screw hole and a sixth screw hole which penetrate perpendicularly to the horizontal plane, the lower ends of the four-dimensional optical adjusting frame 210 and the laser bracket base 270 are correspondingly provided with a seventh screw hole and an eighth screw hole, in the embodiment shown in fig. 1, the number of the fifth screw hole and the seventh screw hole is two, the number of the sixth screw hole and the number of the eighth screw hole are three, a screw penetrates through the fifth screw hole and the seventh screw hole from the lower end to fix the four-dimensional optical adjusting frame 210 on the adjusting frame base 260, and penetrates through the sixth screw hole and the eighth screw hole from the lower end to fix the laser bracket base 270 on the adjusting frame base 260, and the second laser outlet 252 and the third laser outlet 261 are aligned to realize the fixed assembly of the whole central indicating assembly.
After the center indicating assembly is fixed on the CT frame through the holes at the two ends of the long strip-shaped laser bracket bottom plate 270 after the assembly is completed, a plate perpendicular to the horizontal plane is arranged at one end of the third laser outlet 261 from which laser is emitted, the detector ring of the CT frame is rotated, and the four-dimensional optical adjusting frame 210 is adjusted so that the spot position of the laser emitted by the laser irradiated on the plate is unchanged. At this time, the center indicating unit may be used as a center indicating unit of the CT gantry, and the laser beam having the same axial direction as the CT gantry is emitted from the first laser outlet 241, and the laser beam parallel to and located directly above or directly below the axial direction of the CT gantry is emitted from the third laser outlet 261.
The center indicating assembly provided by the invention is simple in structure, flexible to install, and simple and effective in determining method by adjusting the four-dimensional optical adjusting frame to determine the axle center of the CT rack. And as the central indication component of CT frame, when other structures align with CT frame center according to this central indication component according to actual need, can give the indication laser of relative two directions, carry out the alignment to the bed body of both sides and PET frame simultaneously and instruct, can realize the simultaneous alignment of PET frame, CT frame and bed body for alignment time has improved work efficiency.
Example two
As can be seen from fig. 2 and 3, the embodiment of the PET-CT mounting rack provided by the present invention includes a central indicating assembly 200 provided by the first embodiment of the present invention, and a bed central alignment plate 300, where the central indicating assembly 200 splits laser light emitted from a laser in the bed central alignment plate to emit two beams of light in parallel opposite directions. The direction of the light beam pointing to the PET rack is the axis direction of the CT rack, and the PET imaging system alignment regulating device 100 regulates according to the light beam so as to center align the PET rack and the CT rack; the direction of the light beam pointing to the bed body is positioned right above or right below the axis direction of the CT frame, the bed body is adjusted in the horizontal direction according to the light beam, so that the bed body is aligned with the center of the CT frame, and the alignment of the whole PET-CT mounting frame is completed. The center indicating assembly 200 can simultaneously align the bed body and the PET rack on two sides, so that the PET rack, the CT rack and the bed body can be aligned simultaneously, the alignment time is shortened, and the working efficiency is improved.
The laser output end of the first laser outlet 241 of the center indicating assembly 200 is provided with a PET imaging system alignment adjustment device 100, and the PET imaging system alignment adjustment device 100 performs center alignment adjustment of the PET gantry and the CT gantry according to the center indicating assembly 200.
As shown in fig. 4, which is a schematic structural diagram of the bed body center alignment plate provided in the embodiment of the present invention, as shown in fig. 4, the bed body center alignment plate 300 is used for center adjustment of the bed body and the CT machine frame, the number of the bed body center alignment plates is two, the two are respectively disposed at the upper ends of the center positions of the bed head and the bed tail, the bed body center alignment plate 300 is provided with a second oblong hole 310 whose axial direction is parallel to the horizontal plane direction, and the long side direction of the second oblong hole 310 is perpendicular to the horizontal plane direction.
According to the PET-CT mounting rack provided by the invention, the central indicating component arranged on the CT rack can simultaneously emit central indicating lasers towards the bed body and two sides of the PET rack, the central indicating lasers emitted towards the PET rack side are in the axis direction of the CT rack in consideration of actual demands, the central indicating lasers emitted towards the bed body side are positioned right above and right below the axis direction of the CT rack, and three parts can be simultaneously aligned, so that the alignment time is shortened, and the working efficiency is improved. The PET imaging system alignment adjusting device is simple and convenient to move, and can be aligned by using linear laser through the movably connected round hole and the oblong hole: after the alignment in the horizontal direction is realized in the horizontal movement process, the alignment in the vertical direction is regulated. Realize adjusting function's regulation base, simple structure through setting up the altitude mixture control bearing in the four corners position, and rotatory altitude mixture control bearing changes the altitude mixture control bearing of fixed plate lower extreme, and then changes the main tributary supporting mechanism and be provided with the altitude mixture control bearing's of each point, can realize center alignment regulation, and altitude mixture control bearing makes adjustment process simple swift a few.
Referring to fig. 5, which is a schematic structural diagram of an embodiment of a PET imaging system alignment adjustment device provided by the present invention, as can be seen from fig. 5, the PET imaging system alignment adjustment device 100 includes two target holders 110 disposed perpendicular to a horizontal plane and a main support mechanism 120 for mounting and fixing the target holders 110 or the PET gantry.
The two target frames 110 are parallel to each other, and the direction of the line connecting the centers of the targets indicates the axial direction of the PET imaging system.
The main support mechanism 120 comprises an adjustment base 121 and a stand bottom plate 122 arranged on the adjustment base 121 and used for installing and fixing the target frames 110 or the PET stand, the adjustment base 121 is used for adjusting the distances between different positions of the stand bottom plate 122 and the ground, so that the centers of the targets of the two target frames 110 are coincident with the central axes of other imaging systems, and the PET stand is installed on the main support mechanism 120 after adjustment.
The adjustment base 121 and the chassis base 122 are formed by precision machining, and are symmetrically disposed with respect to the axial direction.
Preferably, as shown in fig. 6 and 7, which are enlarged partial views of a and B of fig. 1, respectively, as can be seen from fig. 6 and 7, the upper ends of the two target holders 110 are provided with a first oblong hole 111 and a circular hole plate 113 provided with a circular hole 112, and the circular hole plate 112 is detachably connected to the target holders 110.
The circular orifice plates 113 are arranged parallel to the plate surface of the target frame 110 and are perpendicular to the horizontal plane, the circular orifice plates 113 are arranged on any side of the target frame 110, and in the embodiment shown in fig. 5, the circular orifice plates are arranged on different sides of the two target frames.
When the circular hole plate 112 is fixed to the target holder 110, the circular hole 112 communicates with the first oblong hole 111, and is provided at the center of the first oblong hole 111. The axial direction of the circular hole 112 and the first oblong hole 111 is parallel to the horizontal plane direction, and the longitudinal direction of the first oblong hole 111 is the direction perpendicular to the horizontal plane.
Further, as shown in fig. 8, which is a bottom view of an embodiment of the adjustment base provided by the present invention, the adjustment base 121 includes at least one set of symmetrically disposed rolling bearings 123 disposed on a lower bottom surface, such as a bullseye ball bearing, and in the embodiment shown in fig. 8, four sets of rolling bearings 123 are disposed on the lower bottom surface of the adjustment base 121 and are symmetrical left and right.
The adjusting base 121 further includes at least four height adjusting bearings 124 symmetrically disposed around the periphery, so as to effectively adjust the space between the frame bottom plate 122 and the ground, and in the embodiments shown in fig. 5 and 8, the number of the height adjusting bearings 124 is four, which are respectively disposed at four corners of the adjusting base 121. The two ends of the adjustment base 121 are respectively provided with a fixing plate 125 disposed parallel to the horizontal plane below the chassis base 122, and the height adjustment bearing 124 is disposed perpendicular to the horizontal plane through and movably fixed to the fixing plate 125. The height adjusting bearings 124 are rotated to change the height of the height adjusting bearings 124 at the lower end of the fixing plate 125, and then the heights of the points where the main supporting mechanism 120 is provided with the height adjusting bearings 124 are changed, so that the center alignment adjustment can be realized, and the number of the height adjusting bearings 124 is small, so that the adjustment process is simple and quick.
As shown in fig. 9, which is a schematic cross-sectional view of the connection between the height-adjusting bearing and the fixing plate, as can be seen from fig. 9, the height-adjusting bearing 124 includes a base 1241 and a support post 1242, and the support post 1242 is a hexagonal bolt with a protrusion 1243 at a lower end along a horizontal direction. The upper end of the base is provided with an opening 1244, the width of the opening 1244 is larger than that of a hexagonal bolt, the width of a bolt column of the hexagonal bolt is smaller than that of a protrusion 1243, and a thrust ball bearing 1245 is arranged inside the base 1241. After passing through the opening 1244 of the base 1241, the support column 1242 is disposed above the base 1241, the upper end of the protrusion 1243 contacts with the inner cover of the base 1241, and the lower end is disposed on the thrust ball bearing 1245. The support column 1242 is connected with the fixing plate 125 through threads, the height adjusting bearing 124 is rotated by means of the head of the hexagonal bolt when in use, and the thrust ball bearing 1245 can bear thrust load when the bolt rotates, so that the height of the height adjusting bearing 124 at the lower end of the fixing plate 125 is changed, and the heights of all points where the main supporting mechanism 120 is provided with the height adjusting bearing 124 are changed. The height adjustment bearing 124 is used as a PET gantry load bearing support member with M20 bolts.
In the alignment adjustment process of the alignment adjustment device of the PET imaging system provided in this embodiment, when the axis direction of the PET imaging system does not coincide with the central axes of other imaging systems, the displacement parallel to the horizontal plane direction is adjusted first: the height of the height adjusting bearing is adjusted to ensure that the base is not contacted with the ground, and the rolling bearing is used for pushing the PET imaging system to move in the horizontal direction, so that the axes of other imaging systems pass through the first oblong holes of the two target frames. Readjust the displacement perpendicular to the horizontal plane: the round hole plate is contacted with the ground with the height of the height adjusting bearing, the bottom seat at the lower end of the height adjusting bearing is contacted with the ground, the bottom plate of the adjusting rack is provided with the displacement of each point of the height adjusting bearing perpendicular to the horizontal plane direction, the axes of other imaging systems penetrate through the round holes of the two target frames, and the whole adjusting process is quicker and simpler.
The alignment adjusting device of the PET imaging system provided by the invention is simple and convenient to move, and can be aligned by using linear laser through the movably connected round hole and the oblong hole: after the alignment in the horizontal direction is realized in the horizontal movement process, the alignment in the vertical direction is regulated. Realize adjusting function's regulation base, simple structure through setting up the altitude mixture control bearing in the four corners position, rotates this altitude mixture control bearing and changes the height on the position of this altitude mixture control bearing of fixed plate below, can realize center alignment regulation, and the altitude mixture control bearing number makes the adjustment process simple swiftly less.
Example III
An embodiment III of the present invention is an embodiment of an alignment method for a PET-CT mounting frame provided by the second embodiment of the present invention, and specifically, an alignment process for a PET-CT mounting frame provided by the second embodiment of the present invention includes:
step 1, determining a position of a center indicating assembly 200 of a CT gantry.
Specifically, the step 1 includes:
in step 1-1, the two ends of the laser-stand base plate 270 of the center indicating assembly 200 are fixed to the CT gantry such that the laser-stand base plate 270 is disposed on any diameter of the CT gantry detector ring.
Step 1-2, a plate parallel to the CT gantry is disposed on the exit side of the first laser outlet 241 of the center indicating assembly 200.
In step 1-3, the detector ring of the CT gantry is rotated and the four-dimensional optical adjustment frame 210 is adjusted so that the spot position of the laser light emitted by the laser 280 on the plate is unchanged.
In steps 1-4, the detector ring of the CT gantry is rotated such that the laser inlet 251 is directly above or directly below the second laser outlet 252.
And 2, aligning the axes of the PET machine frame and the CT machine frame by taking the center indicating assembly 200 as a reference.
Specifically, the step 2 includes:
in step 2-1, the PET imaging system is disposed on the emitting side of the first laser outlet 241 of the central indication assembly 200, the height of each height adjusting bearing 124 of the alignment adjusting device 100 of the PET imaging system is adjusted, so that the base 1241 is not contacted with the ground, the circular hole plate 113 is detached from the target frame 110, and the rolling bearing 123 is used to push the PET imaging system to move in the horizontal direction, so that the axis of the central indication assembly 200 passes through the first oblong holes 111 of the two target frames 110.
Step 2-2, the height of each height-adjusting bearing 124 is adjusted so that its base 1241 is placed on the ground.
Step 2-3, the circular hole plate 113 is mounted on the target frames 110, and the height of each height adjusting bearing 124 is adjusted so that the axis of the center indicating assembly 200 passes through the circular holes 112 of the two target frames 110.
Step 2-4, the target holder 110 is removed from the main support mechanism 120 and the PET gantry is mounted to the main support mechanism 120.
And 3, aligning the axes of the CT machine frame and the bed body by taking the center indicating assembly 200 as a reference.
Specifically, the step 3 includes: the PET imaging system is arranged on the emitting side of the third laser outlet 261 of the central indication assembly 200, and the left-right displacement of the bed body is adjusted, so that the laser emitted by the third laser outlet 261 passes through the two second oblong holes 310.
The bed body can move up and down, so that the alignment of the axis of the CT machine frame and the bed body only comprises the alignment of the axis in the horizontal direction, and the alignment is performed by arranging the second oblong hole 310 with the long side direction being perpendicular to the horizontal direction.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (17)
1. A center indicating assembly, characterized by: the device comprises a four-dimensional optical adjusting frame and a laser fixed in the middle of the four-dimensional optical adjusting frame, wherein a beam splitter is arranged at the laser emitting end of the laser, and a reflecting mirror is arranged at one side of the beam splitter;
the included angle between the beam splitting mirror surface of the beam splitter and the laser emitted by the laser is 45 degrees, and the included angle between the reflecting mirror surface of the reflecting mirror and the beam splitting mirror surface of the beam splitter is 90 degrees;
after passing through the spectroscope, part of the emitted laser is emitted in the original direction, and the other part of the emitted laser enters the reflecting mirror; the laser entering the reflector is reflected and then emitted in the direction parallel and opposite to the laser emitting direction of the laser;
the center indicating assembly is a center indicating assembly of the CT stand, and is arranged on the CT stand and used for determining the axle center of the CT stand by adjusting the four-dimensional optical adjusting frame;
the central indication assembly is installed on the CT rack and simultaneously sends out central indication laser towards the two sides of the bed body and the PET rack, when the central indication assembly is aligned with the center of the CT rack, the central indication assembly splits the laser sent by the laser in the central indication assembly and sends out two beams of light in parallel opposite directions, and simultaneously, the bed bodies on the two sides and the PET rack are aligned for indication, so that the alignment of the PET rack, the CT rack and the bed body is realized.
2. The center indicating assembly of claim 1, wherein:
the center indicating assembly further comprises a spectroscope base, the spectroscope base is in a cuboid shape, one surface, close to the laser, of the spectroscope base is provided with a cuboid opening which penetrates through and is perpendicular to the emitted laser in the axial direction, and the spectroscope and the reflecting mirror are arranged in the cuboid opening;
the spectroscope base is also provided with a first laser outlet corresponding to the position of the spectroscope, and light transmitted by the spectroscope is emitted through the first laser outlet.
3. The center indicating assembly of claim 1, wherein: the center indicating assembly further comprises a spectroscope clamp, the spectroscope base is arranged in the spectroscope clamp, the spectroscope clamp is of a door-shaped structure and comprises a laser access plate which is perpendicular to the laser emission arrangement, and a positioning plate which is positioned at the upper end and the lower end of the laser access plate and is vertically connected with the laser access plate;
the laser inlet and the second laser outlet are arranged on the laser inlet and outlet plate, and after the laser emitted by the laser enters the spectroscope through the laser inlet, the laser reflected by the spectroscope is reflected again through the second laser outlet after passing through the reflector.
4. The center indicating assembly of claim 2, wherein: the center indicating assembly further comprises a laser support base plate fixedly connected with the spectroscope base, the laser support base plate is of a strip-shaped plate shape, the spectroscope base plate is fixed in the middle of the laser support base plate, and the laser support base plate is located on any diameter of the CT frame detector ring and two ends of the laser support base plate are fixedly connected with the CT frame.
5. The utility model provides a PET-CT installs frame, is including PET imaging system alignment adjusting device, multi-mode imaging center instruction subassembly and the bed body, center instruction subassembly sets up PET imaging system alignment adjusting device and the bed body between, instruct PET imaging system alignment adjusting device and the bed body carry out the center alignment, its characterized in that: the multi-mode imaging center indicating assembly is the center indicating assembly according to any one of claims 1 to 3, and the multi-mode imaging center indicating assembly is arranged on a CT rack; a center alignment plate is arranged on the bed body;
the PET imaging system alignment adjusting device is arranged at the transmission laser output end of the spectroscope of the central indicating assembly, and the PET imaging system alignment adjusting device performs central alignment adjustment of the PET stand and the CT stand according to the central indicating assembly;
the center alignment plate of the bed body is used for center adjustment of the bed body and the CT stand, the number of the center alignment plate is two, the center adjustment plate is respectively arranged at the upper ends of the head and the tail of the bed body, the center alignment plate of the bed body is provided with a second oblong hole with the axial direction parallel to the horizontal plane direction, and the long side direction of the second oblong hole is perpendicular to the horizontal plane direction.
6. The PET-CT mounting gantry of claim 5, wherein: the PET imaging system alignment adjusting device comprises two target frames which are arranged perpendicular to a horizontal plane and a main supporting mechanism used for installing and fixing the target frames or the PET machine frame;
the two target frames are parallel to each other, and the direction of the connecting line of the target center indicates the direction of the axis of the alignment regulating device of the PET imaging system;
the main support mechanism comprises an adjusting base and a frame bottom plate which is arranged on the adjusting base and used for installing and fixing the target frames or the PET frame, and the adjusting base is used for adjusting the distances between different positions of the frame bottom plate and the ground so that the bulls centers of the two target frames are overlapped with the central shafts of other imaging systems;
the PET rack is arranged on the main supporting mechanism after adjustment.
7. The PET-CT mounting gantry of claim 6, wherein: the upper ends of the two target frames are provided with first oblong holes and round hole plates provided with round holes, and the round hole plates are detachably connected with the target frames.
8. The PET-CT mounting gantry of claim 7, wherein: the round hole plate is parallel to the plate surface of the target frame and is perpendicular to the horizontal plane, and the round hole plate is arranged on any side of the target frame.
9. The PET-CT mounting gantry of claim 7, wherein: when the circular hole plate is fixed on the target frame, the circular hole is communicated with the first oblong hole and is arranged at the center of the first oblong hole; the axial direction of the round hole and the first oblong hole is parallel to the horizontal plane direction, and the long side direction of the first oblong hole is the direction vertical to the horizontal plane.
10. The PET-CT mounting gantry of claim 6, wherein: the adjusting base comprises at least one group of symmetrically arranged rolling bearings arranged on the lower bottom surface.
11. The PET-CT mounting gantry of claim 6, wherein: the adjusting base comprises at least four height adjusting bearings arranged on the periphery;
the two ends of the adjusting base are respectively provided with a fixed plate which is positioned below the bottom plate of the stand and is parallel to the horizontal plane, and the height adjusting bearing penetrates through and is movably fixed on the fixed plate and is vertical to the horizontal plane;
and rotating each height adjusting bearing to change the height of the height adjusting bearing so as to adjust the distance between the bottom plate of the rack and the ground.
12. The PET-CT mounting gantry of claim 11, wherein: the height adjusting bearing comprises a base and a supporting column, wherein the supporting column is a hexagon bolt with a protrusion at the lower end along the horizontal direction;
the upper end of the base is provided with an opening, the width of the opening is larger than that of the column of the hexagonal bolt and smaller than that of the bulge;
a thrust ball bearing is arranged in the base;
the support column passes through the opening of the base and then is arranged above the base, the upper end of the protrusion is contacted with the inner cover of the base, and the lower end of the protrusion is arranged on the thrust ball bearing.
13. The PET-CT mounting gantry of claim 12, wherein: the support column is connected with the fixing plate through threads.
14. A method of aligning a PET-CT mounting gantry according to any one of claims 5-13, wherein: the method comprises the following steps:
step 1, determining the position of the central indicating component of the CT rack;
step 2, aligning the axes of the PET stand and the CT stand by taking the central indication assembly as a reference;
and 3, aligning the axes of the CT frame and the bed body by taking the central indication assembly as a reference.
15. The alignment method of claim 14, wherein:
the step 1 comprises the following steps:
step 1-1, fixing two ends of a laser bracket bottom plate of the center indicating assembly on the CT frame, so that the laser bracket bottom plate is arranged on any diameter of a detector ring of the CT frame;
step 1-2, arranging a plate parallel to the CT frame on the first laser outlet emission side of the central indicating assembly;
step 1-3, rotating a detector ring of the CT frame, and adjusting a four-dimensional optical adjusting frame to ensure that the spot position of laser emitted by a laser irradiated on the plate is unchanged;
and step 1-4, rotating the detector ring of the CT frame to enable the laser inlet to be positioned right above or right below the second laser outlet.
16. The alignment method of claim 14, wherein: the step 2 comprises the following steps:
step 2-1, arranging the PET imaging system on the first laser outlet emission side of the central indicating assembly, adjusting the heights of all height adjusting bearings of the alignment adjusting device of the PET imaging system, enabling the base not to contact the ground, detaching the round hole plate from the target frame, pushing the PET imaging system to move in the horizontal direction by virtue of the rolling bearing, and enabling the axle center of the central indicating assembly to pass through first oblong holes of the two target frames;
step 2-2, adjusting the height of each height adjusting bearing to enable the base of each height adjusting bearing to be placed on the ground;
step 2-3, mounting a circular hole plate on the target frame, and adjusting the height of each height adjusting bearing to enable the axle center of the central indicating assembly to pass through the circular holes of the two target frames;
and 2-4, detaching the target frame from the main supporting mechanism, and mounting the PET frame on the main supporting mechanism.
17. The alignment method of claim 14, wherein: the step 3 comprises the following steps: and arranging the PET imaging system at the third laser outlet emission side of the central indication assembly, and adjusting the left-right displacement of the bed body to enable the laser emitted by the third laser outlet to pass through the two second oblong holes.
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| CN108742677A (en) * | 2018-05-24 | 2018-11-06 | 明峰医疗系统股份有限公司 | A kind of devices and methods therefor for tandem PET/MR systems registration |
| CN112386274A (en) * | 2019-08-15 | 2021-02-23 | 上海西门子医疗器械有限公司 | Method and system for calibrating position of examination table relative to CT frame |
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