CN107320122B - CT center indicating assembly and PET-CT mounting rack - Google Patents

CT center indicating assembly and PET-CT mounting rack Download PDF

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Publication number
CN107320122B
CN107320122B CN201710439412.9A CN201710439412A CN107320122B CN 107320122 B CN107320122 B CN 107320122B CN 201710439412 A CN201710439412 A CN 201710439412A CN 107320122 B CN107320122 B CN 107320122B
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plate
laser
calibration
adjusting
optical
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CN107320122A (en
Inventor
张建兵
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Hubei Ruishi Digital Medical Imaging Technology Co ltd
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Hubei Ruishi Digital Medical Imaging Technology Co ltd
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Priority to CN201510380915.4A priority Critical patent/CN104905811B/en
Priority to CN201710439412.9A priority patent/CN107320122B/en
Publication of CN107320122A publication Critical patent/CN107320122A/en
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03Computerised tomographs
    • A61B6/032Transmission computed tomography [CT]
    • A61B6/035Mechanical aspects of CT
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03Computerised tomographs
    • A61B6/037Emission tomography
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/44Constructional features of apparatus for radiation diagnosis

Abstract

A CT center indicating assembly and a PET-CT mounting rack are provided, the CT center indicating assembly is mounted on a CT fixed rack and comprises a laser calibration device and a calibration bottom plate, wherein the laser calibration device is fixedly mounted on the CT fixed rack; the calibration bottom plate is arranged on the transverse diameter of the CT fixed rack and comprises a calibration bottom plate body, the length of the calibration bottom plate body is the same as the diameter of the CT fixed rack, the curvatures of two side edges of the calibration bottom plate body are also the same as the curvature of the CT fixed rack, and a through hole for passing laser is further formed in the center of the calibration bottom plate body; the laser calibration device comprises a laser and an optical platform for mounting the laser, the optical platform comprises an optical bottom plate, a laser adjusting table and a light guide hole plate, the laser adjusting table and the light guide hole plate are positioned on the optical platform, and the light guide hole plate is vertically fixed on the optical bottom plate.

Description

CT center indicating assembly and PET-CT mounting rack
Technical Field
The invention relates to the technical field of medical instruments, in particular to a medical imaging device, and particularly relates to a multi-mode imaging system.
Background
The multi-modality imaging system may be used for scanning in multiple modalities, such as Positron Emission Tomography (PET), Single Positron Emission Computed Tomography (SPECT), nuclear resonance imaging (MRI), Computed Tomography (CT), and the like.
In a multimode system (also called a multi-mode system), different scans are completed by using partially same hardware, for example, PET-CT organically combines PET and CT together, uses the same examining table and the same image processing workstation, utilizes the inherent coincidence of PET and CT images, forms a PET-CT fusion image by an image reconstruction fusion technology through the PET image and the CT image, can simultaneously reflect the pathophysiological change and the morphological structure of a focus by one-time imaging, realizes advantage complementation, and has the characteristics of high sensitivity, accuracy, high specificity, accurate positioning and the like.
The above-mentioned intrinsic registration is based on the assumption that the coordinate systems of different imaging systems, for example, the coordinate systems of the PET and CT devices are aligned, and if the coordinate systems of the different imaging systems are not aligned, the misregistration of the images may be directly caused, and subsequent image reconstruction and other steps cannot be performed, so that accurate image information cannot be provided.
Therefore, there is a need for a mounting mechanism that has a simple structure and is easy to adjust, and can ensure the coaxial requirements of different imaging systems.
Disclosure of Invention
The invention aims to provide a CT center indicating assembly and a PET-CT mounting rack, 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 bring convenience to the maintenance and security inspection of equipment.
In order to achieve the above purpose, the solution of the invention is as follows:
the invention discloses an alignment adjusting and separating device of a multi-mode imaging system, which comprises a target frame for indicating the axis of a PET rack and a main supporting mechanism for installing and fixing the target frame or the PET rack;
the target frame is used for indicating the axle center of the PET rack, the height of the target center of the target frame is the same as that of the axle center of the PET rack, and the target frame and the PET rack are arranged at the same position;
the main supporting mechanism comprises an adjusting base fixed on the ground and adjustable in height, a moving platform arranged on the adjusting base and capable of moving back and forth along the axial direction, and a rack bottom plate located on the moving platform and used for installing and fixing the target stand or the PET rack, the adjusting base is coaxially arranged with other imaging systems, and the target stand moves back and forth along with the moving platform to adjust the height of the adjusting base, so that the target center of a target is overlapped with the central shafts of the other imaging systems when the target stand is fixed on the rack bottom plate; the PET gantry is mounted on the adjusted main support mechanism for alignment and following the mobile platform axially away from or toward the other imaging systems.
The adjusting base comprises a mounting base plate fixed on the ground and a mounting base plate initially arranged in parallel with the mounting base plate, the mounting base plate is connected with the mounting base plate through a plurality of groups of adjusting bolts and tightening bolts, the adjusting bolts adjust the distance between the mounting base plate and the mounting base plate to determine the height of the adjusting base, and the tightening bolts are used for maintaining and fixing the distance between the adjusted mounting base plate and the mounting base plate;
preferably, a thrust ball bearing is further arranged between the adjusting bolt and the mounting base plate to assist in adjustment of the adjusting bolt.
The movable platform comprises two guide rails arranged in parallel to the axial direction and sliders positioned on the respective guide rails, the guide rails are arranged on the mounting base plate, the two guide rails are symmetrically arranged relative to the axial direction, and the lower bottom surface of the rack base plate is fixedly connected with the sliders respectively so as to move along with the movement of the sliders in the axial direction.
The movable platform further comprises a power assembly and a screw rod assembly, the screw rod assembly is arranged between the two guide rails and comprises a screw rod and a nut arranged on the screw rod, the output end of the power assembly is connected with the screw rod, and the lower bottom surface of the rack bottom plate is fixedly connected with the nut so as to be driven by the power assembly to move back and forth along the axial directions of the guide rails and the screw rod.
The target center of the target is in a cross-shaped or straight-line structure.
Due to the adoption of the scheme, the invention has the beneficial effects that:
the aligning, adjusting and separating device of the multi-mode imaging system can realize the separation and the axle center calibration of PET equipment and other imaging systems (such as imaging equipment of CT, MRI and the like), and components in the device are formed by precision processing to ensure the installation precision, wherein, a main supporting mechanism and other imaging systems are coaxially arranged to realize the positioning of a plane where the axial direction is located, a target frame for replacing the axle center position of the PET rack is arranged on a rack bottom plate, after the target center of the target frame and other imaging systems are positioned on the same height by finely adjusting the height of a base, the adjusted adjusting base is fixed to realize the three-dimensional space positioning of the target center position of the target frame, because the target frame and the PET rack are arranged on the same station of the rack bottom plate, the target center is superposed with the center of the PET rack, after the three-dimensional space positioning of the target center position is realized, the target frame is detached, and when the PET rack is integrally arranged on the, the axis of the PET frame is coaxial with other imaging systems. The aligning and adjusting and separating device can effectively separate the PET equipment from other imaging systems and calibrate the axis, has simple integral structure and convenient operation, and can be used for carrying out axial calibration in an alternative mode, thereby avoiding various inconvenient operations caused by directly calibrating a PET rack with large weight.
The invention also discloses a CT center indicating assembly which is arranged on a CT fixed rack and comprises a laser calibration device and a calibration bottom plate, wherein the laser calibration device is fixedly arranged on the CT fixed rack;
the calibration bottom plate is arranged on the transverse diameter of the CT fixed rack and comprises a calibration bottom plate body, the length of the calibration bottom plate body is the same as the diameter of the CT fixed rack, the curvatures of two side edges of the calibration bottom plate body are also the same as the curvature of the CT fixed rack, and a through hole for passing laser is further formed in the center of the calibration bottom plate body;
the laser calibration device comprises a laser and an optical platform for mounting the laser, the optical platform comprises an optical bottom plate, a laser adjustment table and a light guide hole plate, the light guide hole plate is vertically fixed on the optical bottom plate, when the laser calibration device is mounted on the calibration bottom plate, the light guide hole of the light guide hole plate is axially overlapped with the through hole to serve as an adjustment reference of the laser, the laser is mounted on the laser adjustment table, and the distance between the laser adjustment table and the optical platform is adjustable to adjust so that the laser emitted by the laser can pass through the light guide hole.
The calibration bottom plate also comprises two connecting lug plates, the connecting lug plates are positioned at two sides of the calibration bottom plate body, and connecting holes are correspondingly formed in the connecting lug plates and the CT fixed rack to assist in positioning between the calibration bottom plate body and the CT fixed rack;
preferably, the calibration bottom plate body and the connecting ear plate are integrally processed;
preferably, the laser adjusting table includes an adjusting bottom plate and an adjusting bolt penetrating through the adjusting bottom plate, the laser is fixed on the adjusting bottom plate, the adjusting bottom plate and the optical bottom plate are provided with a plurality of connecting holes corresponding to the adjusting bolt, and the adjusting bottom plate and the optical bottom plate adjust a distance therebetween via the plurality of adjusting bolts so that laser emitted by the laser can penetrate through the light guide hole;
preferably, a positioning groove is correspondingly formed at the connection position of the optical bottom plate and the calibration bottom plate body, and the optical bottom plate and the calibration bottom plate body are connected in a positioning manner through the positioning groove;
preferably, the positioning groove on the optical base plate and the laser adjusting table share a common vertical surface to assist in positioning between the laser and the calibration base plate.
Due to the adoption of the scheme, the invention has the beneficial effects that:
the invention discloses a CT center indicating assembly, which is used for confirming and indicating a CT axis, wherein the CT center indicating assembly realizes the positioning of the CT axis through a machining mode, and particularly, the CT center indicating assembly is fixedly arranged on a CT fixed rack and comprises a laser calibrating device and a calibrating bottom plate, wherein the laser calibrating device and the calibrating bottom plate are machined, the length of a calibrating bottom plate body in the calibrating bottom plate is the same as the diameter of the CT fixed rack, a laser in the laser calibrating device is positioned at the central position of the calibrating bottom plate body, and the laser can be regarded as the designated position of the axis of the CT fixed rack when the horizontally adjusted CT center indicating assembly is fixedly arranged on the CT fixed rack because the axial direction and the horizontal direction are adjusted in the installation process of the CT fixed rack.
Thirdly, the invention also discloses a PET-CT installing rack, which comprises an axial center CT center indicating component for indicating the CT equipment and the alignment adjusting and separating device; the CT center indicating assembly and the aligning, adjusting and separating device are coaxially arranged, and the height of the adjusting base in the aligning, adjusting and separating process is confirmed by the aligning, adjusting and separating device according to the position of the CT center indicating assembly.
Preferably, the CT center indicating assembly is the CT center indicating assembly as described above.
Due to the adoption of the scheme, the invention has the beneficial effects that:
the PET-CT installation rack comprises the CT center indicating assembly and the aligning, adjusting and separating device, wherein the CT center indicating assembly 200 is fixedly installed on the rack of the CT and used for indicating the axis of the CT, and the aligning, adjusting and separating device 100 is used for aligning the axes of the PET and the CT according to the CT center indicating assembly 200 and realizing the separation of the PET and the CT.
Fourthly, the invention discloses a PET-CT aligning method: the method comprises the following steps:
(1) determining the position of an indicating component of the axis of the CT machine frame;
(2) the axis of the PET equipment and the axis of the image equipment are aligned by taking the indicating component of the axis of the CT rack as a reference:
(2-1) driving the power assembly to work so that the target frame moves to a far end far away from the CT device along with the moving platform, and adjusting the adjusting bolt so that laser emitted by a laser in the indicating assembly is superposed with a target center of the target frame;
(2-2) driving the power assembly to work again, so that the target frame moves to a position close to the near end of the CT device, and adjusting the adjusting bolt again, so that the laser emitted by the laser is superposed with the target center of the target frame;
(3) PET rack installation and alignment: and disassembling the target frame, integrally installing the PET rack on an installation station of the target frame, and moving the PET rack to a working position to finish the coaxial debugging and installation of the PET rack and the CT rack.
Preferably, in the step (1), the confirming of the indicating component position of the axis of the CT gantry includes the following steps:
(1-1) determining laser position: adjusting the laser calibration device to enable the laser emitted by the laser to penetrate through the light guide hole;
(1-2) mounting the debugged laser calibration device on the calibration bottom plate, and adjusting and determining the horizontal state of the CT center indicating assembly after the assembly is finished;
(1-3) installing the verified CT center indicating assembly on a fixed support of the imaging system as a reference, and regarding the position of the laser as the center of the CT;
preferably, in the step (2), after the step (2-2) is finished, the method further comprises the verification step of the step (2-3): driving the power assembly to work again, moving the target frame to any position except the far end and the near end in the stroke, checking the superposition condition of the adjusted target center and the laser, and if the target center and the laser are superposed, maintaining the state of the adjusting base unchanged; and if the deviation occurs, repeating the step (2), and finely adjusting the state of the adjusting base until the laser and the target center are always coincided.
Due to the adoption of the scheme, the invention has the beneficial effects that:
the invention discloses a PET-CT alignment method, which takes an indicating component of the axis of a CT rack as a reference to align the axis of PET equipment and image equipment: the power assembly is driven to work so that the target frame moves to a far end far away from the CT device along with the moving platform, and the adjusting bolt is adjusted so that laser emitted by the laser in the indicating assembly is overlapped with a target center of the target frame; driving the power assembly to work again to enable the target frame to move to a position close to the near end of the CT device, and adjusting the adjusting bolt again to enable the laser emitted by the laser to coincide with the target center of the target frame; PET rack installation and alignment: and disassembling the target frame, integrally installing the PET rack on an installation station of the target frame, and moving the PET rack to a working position to finish the coaxial debugging and installation of the PET rack and the CT rack.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a main support mechanism in an alignment adjustment and separation apparatus of a multi-modality imaging system;
FIG. 2 is a front view of the embodiment of FIG. 1;
FIG. 3 is a schematic view of an exemplary laser and optical platform assembly for a CT center pointing assembly;
FIG. 4 is a schematic view of an exemplary installation structure of an optical platform and a calibration substrate in an embodiment of a CT center pointing assembly
FIG. 5 is a schematic view of the structure of a PET-CT mounting gantry illustrating distal target travel;
FIG. 6 is a schematic view of the structure of a PET-CT mounting gantry embodiment with the target running to the proximal end;
FIG. 7 is a schematic view of the mounting structure of the PET-CT mounting frame after the PET frame is adjusted;
FIG. 8 is a front view of the embodiment of FIG. 7;
FIG. 9 is a schematic view of the PET gantry being transported to a designated workstation via a PET-CT mounting gantry;
the device 100 for alignment adjustment and separation, the main support mechanism 110, the rack bottom plate 111, the mounting base plate 112, the mounting bottom plate 113, the adjusting bolt 114, the tightening bolt 115, the guide rail 116, the slide block 117, the lead screw 118, the stroke limit mechanism 119, the target stand 120, the CT center indication assembly 200, the laser 211, the optical bottom plate 212, the laser adjusting table 213, the light guide hole plate 214, the calibration bottom plate 220, the laser calibration device 210, the CT fixing rack 300 and the PET rack 400 are arranged in sequence.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings.
The invention firstly discloses a device 100 for aligning, adjusting and separating a multi-modality imaging system, which comprises a main supporting mechanism 110 for installing and fixing a PET rack 400 and a target stand 120 for indicating the axis center of the PET rack 400. Separation between the imaging systems is achieved solely by the main support mechanism 110 on the one hand, and alignment of the central axis between the imaging systems is also achieved by the cooperation of the main support mechanism 110 and the backing plate 120 on the other hand.
As shown in fig. 1 and 2, the main supporting mechanism 110 includes an adjusting base fixed on the ground and adjustable in height, a moving platform disposed on the adjusting base and capable of moving back and forth along an axial direction, and a rack base plate 111 disposed on the moving platform and used for mounting and fixing the target stand 120 or the PET rack 400, the adjusting base, the moving platform, and the rack base plate 111 are all formed by precision machining, and are of a structure symmetrically disposed about the axial direction, the target stand 120 and the PET rack 400 are mounted and fixed on the rack base plate 111, and since the rack base plate 111 is fixed on the moving platform, the target stand 120 and the PET rack 400 can move back and forth along the axial direction along with the movement of the moving platform, so that the PET rack 400 can be separated from other imaging systems by the main supporting mechanism 110, and preparation is made for the maintenance of subsequent devices.
The adjusting base comprises a mounting base plate 112 fixed on the ground and a mounting base plate 113 arranged in parallel with the mounting base plate 112 initially, the mounting base plate 112 is fixedly connected with a pile foundation bottom hole arranged on the ground through a plurality of groups of expansion bolts, after the mounting base plate 112 is fixed, the mounting base plate 113 is arranged on the mounting base plate in parallel, the mounting base plate 112 and the mounting base plate 113 are connected through a plurality of groups of adjusting bolts 114 and tightening bolts 115, the adjustment of the distance between the mounting base plate 112 and the mounting base plate 113 can be realized through fine adjustment of the plurality of adjusting bolts 114, and then the fixed and adjusted distance between the mounting base plate 112 and the mounting base plate 113 can be maintained through tightening the plurality of tightening bolts 115. The spacing between the mounting plate 112 and the mounting base 113 is sized so that the target mounted on the adjustment base coincides with the central axis of the other imaging system.
In this embodiment, the adjusting bolts 114 are uniformly distributed on the mounting base plate 113, especially, at two ends of the mounting base plate 113, the adjusting bolts 114 are uniformly and symmetrically distributed, so that the adjustment of the distance between the mounting base plate 113 and the mounting base plate 112 is effectively realized, and sufficient operating space is reserved; the number of tightening bolts 115 is set corresponding to the number of the adjustment bolts 114 and is set near the adjustment bolts 114, so that when the state of one adjustment bolt 114 is determined, the corresponding tightening bolt 115 can effectively fix the state, and finally, the adjustment and maintenance of the distance between the mounting mat 112 and the mounting base plate 113 are realized. In addition, in the present embodiment, a thrust ball bearing is further disposed between each adjusting bolt 114 and the mounting plate 112 to assist in adjusting the adjusting bolt.
The moving platform comprises two guide rails 116 arranged in parallel to the axial direction and sliders 117 positioned on the respective guide rails 116, the guide rails 116 are symmetrically arranged about the central axis, the lower bottom surface of the rack bottom plate 111 is fixedly connected with the two sets of sliders respectively, and when the two sets of sliders move on the respective guide rails, the rack bottom plate 111 arranged on the sliders also moves along with the sliders, so that the target stand 120 or the PET rack 400 can be driven to move along the axial direction finally.
Further, moving platform still includes a power component and the lead screw subassembly that links to each other with the power component output, and lead screw subassembly sets up between two guide rails, including a lead screw and the nut of setting on lead screw 118, and rack bottom plate 111's lower bottom surface also fixes on the nut simultaneously to when power component drive lead screw rotates, rack bottom plate 111 can follow nut axial displacement. Because PET frame 400 weight is great, if it is comparatively difficult along axial displacement on the guide rail through the manpower only, the precision of removal also is difficult to control simultaneously, so except above-mentioned guide rail, slip table, the moving platform has still set up a set of power component separately, when needs move PET frame 400, by power component provides power, drives PET frame 400 or target axial displacement. The power assembly is preferably a motor, the output end of the motor is connected with the lead screw through the coupler, the input end of the motor is connected with the control system, and the rotating speed and the rotating time of the motor can be controlled according to a demand input instruction to realize the control of the moving stroke. In addition, to prevent derailment, travel limit mechanisms 119 are provided near both ends of the lead screw.
When the main supporting mechanism 110 is used for separating the multi-modal imaging systems, only a control command needs to be sent to control the power assembly to work, and the lead screw 118 is driven to rotate, so that the PET rack 400 can be driven to be away from other multi-modal imaging systems according to a specified stroke.
When the alignment adjustment and separation device 100 shown in the present invention is used to perform alignment adjustment between imaging systems, it is firstly ensured that the adjustment base is coaxially disposed with other imaging systems, that is, the PET rack 400 is coaxially disposed with other imaging systems, and then the alignment adjustment between the imaging systems can be performed by adjusting and confirming the axial height of the PET mechanism. Generally, the coaxiality of the adjusting base and other imaging systems is realized by arranging the pile foundation bottom hole of the adjusting base and the pile foundation bottom holes of other imaging systems on the same straight line, when the PET mechanism and other imaging systems are installed, pile foundation bottom holes of the PET mechanism and the other imaging systems are arranged on a predetermined straight line (namely the central axis of the PET mechanism and the other imaging systems), then the machine frame of the imaging system and the main supporting mechanism 110 of the PET equipment are respectively arranged at the bottom holes of the pile foundations, the gantry and main support mechanism 110 of other imaging systems are mounted symmetrically about a predetermined line, namely, the axial positioning of the PET and other imaging systems can be effectively realized firstly, then the height of the PET rack 400 and other imaging systems in the same axial direction can be determined by adjusting the height of the base, alignment of the PET target stand 120 and the PET gantry 400 with respect to the axis of the other imaging systems may be achieved.
The alignment adjustment and separation apparatus 100 of the present invention does not directly mount the PET rack 400 to the main support mechanism 110 and then determine the height of the adjustment base in determining the height of the adjustment base, but rather, it is implemented by the engagement of the surrogate target stand 120 at the center of the PET rack 400 with the main support mechanism 110.
As shown in fig. 5, the target holder 120 and the PET carrier 400 are manufactured by precision machining, so that the target 121 of the target stand 120 completely coincides with the axis of the PET carrier 400, and the mounting position of the target stand 120 on the main support mechanism 110 is the same as the mounting position of the PET carriage 400 on the main support mechanism 110, when the alignment of the imaging system is performed using the alignment adjusting and separating apparatus 100 of the present invention, the target stand 120 is fixed on the main supporting mechanism 110, the position of the target center of the target stand 120 can be replaced by the axial position of the PET rack 400, the height of the main support mechanism 110 is then fine-tuned, the target center of the target stand 120 coincides with the axes of other imaging systems, the target stand 120 is disassembled, and the PET rack 400 is mounted on the adjusted main supporting mechanism 110, so that the PET rack 400 can be aligned with the axes of other imaging systems. With this arrangement, the portable target stand 120 replaces the PET stand 400 to confirm the axial height, thereby avoiding inconvenience in the adjustment process due to the excessive weight of the PET stand 400 itself.
The process of determining the distance between the adjusting bases is as follows: the other imaging systems and the alignment adjusting and separating apparatus 100 are separately installed, and after the target stand 120 is fixed at a designated position of the frame bottom plate 111,
(2-1) as shown in fig. 5, the driving power assembly works to make the target stand 120 move to a far end far away from the imaging device along with the moving platform, and the adjusting bolt is adjusted to make the laser emitted by the laser 211 coincide with the target center of the target stand 120; where the laser 211 is mounted at the axis of the other imaging system.
(2-2) as shown in fig. 6, driving the power assembly again to work, so that the target stand 120 moves to a position close to the proximal end of the imaging device, and adjusting the adjusting bolt again, so that the laser emitted by the laser 211 coincides with the target center of the target stand 120;
through the two times of adjustment, according to the principle that one line is determined from two points, the target center of the target stand 120 and the axes of other imaging systems can be confirmed to be positioned on the same straight line, the adjusting base is already at a proper position at the time, and each tightening bolt on the adjusting base is tightened to position the state of the adjusting base; as shown in fig. 7 and 8, the target holder 120 is then removed, and after the PET rack 400 is integrally mounted on the rack bottom plate 111 at the mounting position of the original target holder 120, as shown in fig. 9, a command is sent to control the power assembly to operate, so that the PET rack 400 is driven to move to the working position, and the support screw is adjusted to effectively bear pressure, and thus the coaxial debugging and mounting of the PET rack 400 and the CT rack can be completed.
After the step (2-2) is finished, in order to further confirm the reliability of the adjustment of the base spacing, a verification step (2-3) can be added, namely, the power assembly is driven again to work, the target frame 120 is moved to any position except the front far end and the near end, the superposition condition of the adjusted target frame 120 and the laser is checked, if the target frame is superposed, the adjustment base is in a proper position, and then, each tightening bolt is tightened, so that the positioning of the adjustment base state is realized. The above verification steps may be repeated as many times as desired.
The multi-modality imaging system alignment adjustment and separation device 100 shown in the invention has the components formed by precision machining to ensure the machining precision, wherein the main support mechanism 110 and other imaging systems are coaxially arranged to realize the positioning of the plane where the axial direction is located, the target stand 120 is installed on the stand bottom plate 111, the adjusted adjusting base is fixed after the target center of the target stand 120 and other imaging systems are located at the same height by finely adjusting the height of the adjusting base, so as to realize the three-dimensional space positioning of the target center position of the target stand 120, because the target center is superposed with the center of the PET stand 400 when the target stand 120 and the PET stand 400 are installed on the stand bottom plate 111, after the three-dimensional space positioning of the target center position is realized, the target stand 120 is removed, and when the PET stand 400 is integrally installed on the stand bottom plate 111, the axis of the PET stand 400 is coaxial with other imaging systems.
The invention also discloses a CT center indicating component 200 for confirming and indicating the CT axis, the CT center indicating component 200 realizes the positioning of the CT axis by a machining method, specifically, the CT center indicating component 200 is fixedly installed on a CT fixed rack 300, as shown in fig. 3 and fig. 4, the CT center indicating component comprises a laser calibration device 210 and a calibration bottom plate 220 which are manufactured by machining, the length of the calibration bottom plate body in the calibration bottom plate 220 is the same as the diameter of the CT fixed rack 300, and a laser 211 in the laser calibration device 210 is located at the center position of the calibration bottom plate body, because the axial direction and the horizontal direction are adjusted in the installation process of the CT fixed rack 300, the laser 211 can be regarded as the designated position of the axis of the CT fixed rack 300 when the CT center indicating component after being adjusted in the horizontal direction is fixedly installed on the CT fixed rack 300.
The laser calibration device 210 includes a laser 211 and an optical platform for mounting the laser 211, the optical platform specifically includes an optical base plate 212, a laser adjustment table 213 and a light guide hole plate 214, the laser adjustment table 213 and the light guide hole plate 214 are disposed on the optical base plate, the optical base plate 212 is integrally mounted at a central position of the calibration base plate 220, and the laser adjustment table and the light guide hole plate 214 are respectively disposed at two ends of the optical base plate 212 and are both perpendicular to the base plate. When the laser calibration device 210 is installed on the calibration base plate 220, the light guide hole plate 214 is axially overlapped with the central point of the calibration base plate body, and meanwhile, the shape of the light guide hole on the light guide hole plate 214 is in a straight shape or a cross shape corresponding to the laser emitted by the laser 211, so that the light guide hole plate 214 is used as a reference to adjust and determine the position of the laser 211. The laser 211 is fixed on the laser adjusting table by bolt pressing, the laser adjusting table comprises an adjusting bottom plate 215 and a plurality of adjusting bolts 216, the adjusting bottom plate 215 is installed on the optical bottom plate, and the adjusting bottom plate 215 and the optical bottom plate are respectively provided with a plurality of connecting holes corresponding to the adjusting bolts 216. The adjusting base plate 215 and the optical base plate 212 are adjusted by the adjusting bolt to adjust the distance therebetween, so that the laser emitted by the laser 211 can effectively pass through the light guide hole, and after the laser calibration device 210 is installed on the calibration base plate 220, the laser 211 and the central point of the calibration base plate body are axially overlapped
The calibration base plate 220 is manufactured in a finish machining mode, is installed on the transverse diameter of the CT fixing frame 300, comprises a calibration base plate body 221, and is provided with a through hole at the center, so that when the laser calibration device 210 is fixed on the calibration base plate body, laser emitted by the laser 211 can sequentially pass through the through hole and the light guide hole to reach the target center of the target frame 120, and then the subsequent alignment step of the CT and the PET frame 400 is carried out.
In one embodiment, the length of the calibration base plate body is the same as the diameter of the CT fixing frame 300, and the curvatures of the two sides of the calibration base plate body are also the same as the curvature of the CT fixing frame 300, so that the calibration base plate body can be clamped and installed on the transverse diameter of the CT fixing frame 300;
in order to guarantee the installation accuracy and the steadiness of calibration bottom plate body, except that the calibration bottom plate body is external, the calibration bottom plate still includes two connection otic placodes, two connection otic placodes are located calibration bottom plate body both sides, it is preferred, the calibration bottom plate body forms with the integrated processing of connection otic placode, connect and correspond on otic placode and the fixed frame 300 of CT and set up the connecting hole, calibration bottom plate body 221 block is fixed in the horizontal diameter position department back of the fixed frame 300 of CT, bolted connection between otic placode and the fixed frame 300 of CT through both sides connection, can be more reliable guarantee the installation accuracy and the reliability of calibration bottom plate 220, furthermore, also can set up the both ends of calibration bottom plate body into the notch cuttype, then radially fix the calibration bottom plate body on the fixed frame 300 of CT through fastening screw.
In order to facilitate the installation and positioning of the laser calibration device 210 on the calibration base plate 220, positioning grooves are correspondingly formed on the surfaces of the calibration base plate body, which are in contact with the optical base plate, respectively, and the positioning grooves on the calibration base plate body are formed along the length direction of the calibration base plate body, the width of each positioning groove is the same as the width of the optical base plate, and the positioning grooves on the optical base plate are formed along the width direction of the optical base plate. The optics bottom plate passes through the constant head tank and links to each other with the perpendicular cross of calibration bottom plate body and carries out preliminary spacing back, links to each other in the fastening that goes on through several groups of bolts between two sets of constant head tanks in order to realize the installation between optics bottom plate and the calibration bottom plate body.
As a preferred scheme, the positioning groove on the optical bottom plate and the laser adjusting table share a vertical surface, and the width of the positioning groove on the optical bottom plate is set to be the same as the thickness of the calibrating bottom plate body, so that when the calibrating bottom plate body is vertically and limitedly connected with the optical bottom plate through two groups of positioning grooves, the laser adjusting table is just arranged close to the wall surface of the calibrating bottom plate body, so as to further improve the installation accuracy, in addition, the width of the positioning groove on the optical bottom plate can also be wider than the thickness of the calibrating bottom plate body, when so designed, in order to improve the installation accuracy, a bolt hole is correspondingly arranged on the vertical surface of the calibrating bottom plate body, and a corresponding bolt passes through the bolt hole and reaches the vertical surface of the laser adjusting table, thereby assisting in realizing the relative fixation of the installation positions of the laser.
The specific steps of using the CT center indication assembly 200 to perform the axis indication of the CT fixed frame 300 are as follows:
(1-1) first, the determination of the mounting position of the laser 211 is performed. Because can ensure through machine tooling that CT center instructs subassembly 200 to assemble the back that finishes, the leaded light hole of leaded light orifice plate 214 and the central axial coincidence of calibration bottom plate body, so laser 211 uses leaded light orifice plate 214 position as the calibration of benchmark in order to realize the mounted position of self: after the laser 211 is fixed on the laser adjusting table, the laser 211 is turned on, and then the distance between the bottom plate 215 and the optical bottom plate is adjusted by fine adjustment, so that the cross-shaped or line-shaped laser emitted by the laser 211 can penetrate through the light guide hole plate 214 to realize the self correction of the laser calibration device 210.
(1-2) the adjusted laser alignment device 210 is then fixed to the alignment base 220, and the leveling of the overall level of the CT center pointing module 200 is performed using a level gauge. The optical bottom plate of the laser calibration device 210 is mounted on the calibration bottom plate 220 through a clamping groove, after the connection and fixation of the optical bottom plate and the calibration bottom plate are realized through bolts, the level meter is placed on the optical bottom plate, and the horizontal state of the component 200, namely the laser 211, is indicated through the CT center after the installation is determined through the level meter. Because the laser calibration device 210 and the calibration base plate 220 are both manufactured by machining, if the laser calibration device 210 and the calibration base plate 220 are installed in place, the laser calibration device 210 is in a horizontal state, the laser calibration device 210 can be used as a reference to adjust the CT fixing rack 300 after being confirmed to be in the horizontal state by the level, and if the level deflects and is not in the horizontal state, the laser calibration device 210 is detached from the calibration base plate 220 and then fixedly installed again until the laser calibration device 210 and the calibration base plate 220 are still in the horizontal state after being confirmed to be connected.
(1-3) finally, the horizontally adjusted CT center indicating assembly 200 is mounted on the CT stationary gantry 300. Since the axial direction and the horizontal direction are already adjusted during the installation of the CT fixing frame 300, when the horizontal adjusted CT center indicating assembly 200 is fixedly installed on the CT fixing frame 300, the laser 211 can be regarded as the designated position of the axis of the CT fixing frame 300.
When the CT center indicating assembly 200 is used for confirming the axis of the CT fixed rack 300, the structure is simple, the installation is convenient, the CT rack does not need to be changed greatly, and meanwhile, the precision can be effectively guaranteed.
On the basis, as shown in fig. 5 and fig. 6, the invention further discloses a PET-CT mounting rack, which comprises a CT center indicating assembly 200 for indicating the center of the CT and the alignment adjusting and separating device 100 as described above, wherein the CT center indicating assembly 200 is fixedly mounted on the rack of the CT for indicating the axis of the CT, and the alignment adjusting and separating device 100 is used for aligning the axes of the PET and the CT according to the CT center indicating assembly 200, and simultaneously, can realize the separation of the two.
The detailed structure of the CT center pointing assembly 200 and the alignment adjustment and separation apparatus 100 will not be described herein. In addition, the specific structure of the CT center indicating assembly can be realized by adopting the existing installation mode and structure as long as the axis position of the CT can be accurately indicated, for example, the CT center indicating assembly comprises a laser and an adjusting structure for fine adjustment of the three-dimensional position of the laser, the laser is installed on the axis position of the CT, whether the laser emitted by the laser can be located on the same point is confirmed in a rotating mode, if the laser is located on the same point, the laser is located on the correct position, if the track of the laser emitted by the laser is a circle during rotation, the existing installation position of the laser deviates from the axis of the CT, and the position of the laser is adjusted by the adjusting structure until the laser emitted by the laser is located on the same point.
The invention also discloses a PET-CT alignment method by using the PET-CT installation rack, which is carried out after the installation of the CT fixed rack 300 and the quasi-adjustment and separation device 100 is finished. Set up the pile foundation bottom hole of CT equipment and PET equipment to fix CT frame and main supporting mechanism 110 respectively and guarantee the coincidence of the two axis with the pile foundation bottom hole appointed, then be fixed in target frame 120 on frame bottom plate 111, can carry out PET-CT's alignment, specifically include following step:
(1) determining the installation of an axis indicating component of the CT frame;
in the step (1), if the structure of the CT indication assembly 200 according to the present invention is adopted to confirm the axis of the CT gantry, the method includes the following steps:
(1-1) first, determination of the laser mounting position is performed. Because can ensure through machine tooling that CT center instructs subassembly 200 to assemble the back that finishes, the leaded light hole of leaded light orifice plate 214 and the central axial coincidence of calibration bottom plate body, so the laser uses the calibration of leaded light orifice plate 214 position as the reference in order to realize the mounted position of self: after the laser is fixed on the laser adjusting table, the laser is turned on, and then the distance between the adjusting bottom plate 215 and the optical bottom plate is finely adjusted, so that the cross-shaped or line-shaped laser emitted by the laser can penetrate through the light guide hole plate 214 to realize the self correction of the laser calibration device 210.
And (1-2) mounting the debugged laser calibration device on a calibration bottom plate, and verifying the horizontal state of the CT center indicating assembly after the assembly is finished. The adjusted laser alignment device 210 is fixed to the alignment base 220, and the horizontal state of the entire CT center pointing module 200 is corrected by the level meter. The optical bottom plate of the laser calibration device 210 is installed on the calibration bottom plate 220 through a clamping groove, after the connection and fixation of the optical bottom plate and the calibration bottom plate are realized through bolts, the level meter is placed on the optical bottom plate, and the horizontal state of the component 200, namely the laser, is indicated through the CT center of the level meter after the installation is determined. Because the laser calibration device 210 and the calibration base plate 220 are both manufactured by machining, if the laser calibration device 210 and the calibration base plate 220 are installed in place, the laser calibration device 210 is in a horizontal state, the laser calibration device 210 can be used as a reference to adjust the CT fixing rack 300 after being confirmed to be in the horizontal state by the level, and if the level deflects and is not in the horizontal state, the laser calibration device 210 is detached from the calibration base plate 220 and then fixedly installed again until the laser calibration device 210 and the calibration base plate 220 are still in the horizontal state after being confirmed to be connected.
(1-3) the verified CT center indicating assembly is mounted on the fixing bracket of the imaging system, the laser can be regarded as the designated position of the axis of the CT fixing frame 300, and after the horizontally adjusted CT center indicating assembly 200 is mounted on the CT fixing frame 300, since the axial direction and the horizontal direction are already adjusted in the mounting process of the CT fixing frame 300, the position of the laser can be regarded as the designated position of the axis of the CT fixing frame 300 when the horizontally adjusted CT center indicating assembly 200 is fixedly mounted on the CT fixing frame 300 through the calibration bottom plate.
If the CT center indicating assembly with other structures is used for confirming the CT axis, the relevant installation steps are carried out, and finally the CT center indicating assembly can accurately indicate the axis position of the CT.
(2) Aligning the axes of the PET equipment and the imaging equipment:
(2-1) driving the power assembly to work so that the target holder 120 moves to a far end away from the imaging device along with the moving platform, and adjusting the adjusting bolt so that the laser emitted by the laser coincides with the target center of the target holder 120;
(2-2) driving the power assembly to work again, so that the target holder 120 moves to a position close to the near end of the imaging device, and adjusting the adjusting bolt again, so that the laser emitted by the laser is superposed with the target center of the target holder 120;
and (2-3) driving the power assembly to work again, moving the target frame 120 to any position except the front far end and the near end, checking the superposition condition of the adjusted target frame 120 and the laser, if the target frame is superposed, indicating that the adjusting base is in a proper position, and tightening each tightening bolt to position the state of the adjusting base.
Under normal conditions, through the adjustment of the step (2-1) and the step (2-2), according to the principle that a line is determined by two points, the adjustment base is in a proper state, and the adjustment base can be directly transferred to the step (3) to install the PET rack 400. The above verification steps may be repeated as many times as desired.
(3) PET rack 400 installation: the target frame 120 is disassembled, the PET rack 400 is integrally installed on the rack bottom plate 111, the PET rack 400 is moved to a working position by the driving power assembly, the supporting screw rod is adjusted to effectively bear pressure, and the coaxial debugging and installation of the PET rack 400 and the CT rack are completed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, 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 embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims (6)

1. A CT center indicating assembly, comprising: the laser calibration device is arranged on a CT fixed frame and comprises a laser calibration device and a calibration bottom plate, wherein the laser calibration device is fixedly arranged on the CT fixed frame;
the calibration bottom plate is arranged on the transverse diameter of the CT fixed rack and comprises a calibration bottom plate body, the length of the calibration bottom plate body is the same as the diameter of the CT fixed rack, the curvatures of two side edges of the calibration bottom plate body are also the same as the curvature of the CT fixed rack, and a through hole for passing laser is further formed in the center of the calibration bottom plate body;
the laser calibration device comprises a laser and an optical platform for mounting the laser, the optical platform comprises an optical bottom plate, a laser adjustment table and a light guide hole plate, the laser adjustment table and the light guide hole plate are positioned on the optical platform, the light guide hole plate is vertically fixed on the optical bottom plate, the light guide hole of the light guide hole plate and the through hole are axially overlapped to be used as an adjustment reference of the laser, the laser is mounted on the laser adjustment table, the distance between the laser adjustment table and the optical bottom plate is adjustable, so that the position of the laser can be adjusted before the laser calibration device is mounted on the calibration bottom plate, and laser emitted by the laser can pass through the light guide hole,
the calibration bottom plate further comprises two connecting lug plates, the connecting lug plates are located on two sides of the calibration bottom plate body, and connecting holes are correspondingly formed in the connecting lug plates and the CT fixed frame to assist in positioning between the calibration bottom plate body and the CT fixed frame.
2. The CT center indicating assembly of claim 1, wherein: the calibration bottom plate body and the connecting lug plate are integrally processed.
3. The CT center indicating assembly of claim 1, wherein: the laser adjusting platform comprises an adjusting bottom plate and an adjusting bolt penetrating through the adjusting bottom plate, the laser is fixed on the adjusting bottom plate, the adjusting bottom plate and the optical bottom plate correspond to the adjusting bolt and are provided with a plurality of connecting holes, and the adjusting bottom plate and the optical bottom plate adjust the distance between the adjusting bottom plate and the optical bottom plate through the adjusting bolt so that laser emitted by the laser can penetrate through the light guide hole.
4. The CT center indicating assembly of claim 1, wherein: the optical bottom plate and the calibration bottom plate body are correspondingly provided with positioning grooves at the connection positions, and the optical bottom plate and the calibration bottom plate body are connected in a positioning mode through the positioning grooves.
5. The CT hub indication assembly of claim 4, wherein: the positioning groove on the optical base plate and the laser adjusting table share a vertical surface to assist in positioning between the laser and the calibration base plate.
6. The CT center indicating assembly of claim 1, wherein: the laser that the laser instrument sent is cross or style of calligraphy laser, the leaded light hole correspondence sets up to cross or style of calligraphy structure.
CN201710439412.9A 2015-07-02 2015-07-02 CT center indicating assembly and PET-CT mounting rack Active CN107320122B (en)

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