CN106344059B - PET detector output signal consistency correction method and system - Google Patents

PET detector output signal consistency correction method and system Download PDF

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Publication number
CN106344059B
CN106344059B CN201610836797.8A CN201610836797A CN106344059B CN 106344059 B CN106344059 B CN 106344059B CN 201610836797 A CN201610836797 A CN 201610836797A CN 106344059 B CN106344059 B CN 106344059B
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pet
detector
rod source
main frame
rod
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Expired - Fee Related
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CN201610836797.8A
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CN106344059A (en
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付长青
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Neusoft Medical Systems Co Ltd
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Neusoft Medical Systems Co Ltd
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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
    • A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computerised tomographs
    • A61B6/032—Transmission computed tomography [CT]
    • 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
    • A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
    • 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
    • A61B6/58—Testing, adjusting or calibrating apparatus or devices for radiation diagnosis
    • 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
    • A61B6/58—Testing, adjusting or calibrating apparatus or devices for radiation diagnosis
    • A61B6/582—Calibration
    • A61B6/585—Calibration of detector units
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
    • A61B2560/02—Operational features
    • A61B2560/0223—Operational features of calibration, e.g. protocols for calibrating sensors

Abstract

The application provides a PET detector output signal consistency correction method and a system thereof, wherein the method comprises the steps of installing a rod source system on a CT main frame, and fixing the rod source system, a CT bulb tube and a CT detector on a rotating plate of the CT main frame; fixing a PET detector on a PET main frame; the rod source system drives a rod source to extend into the inner side of the PET main rack and cover the axial length of the PET detector; the rotating plate of the CT main frame is driven to rotate in a circle, the rotating plate drives the rod source to rotate, the PET detector carries out data collection, and the PET data acquisition system analyzes the collected data to finish the consistency correction of output signals of the PET detector. The invention overcomes the defects of convenient installation and transportation part and high manufacturing cost caused by the large volume of the PET-CT system in the prior art; the defects that the position of the mobile correcting rod source generates deviation, and the correcting result and the image quality are influenced are overcome.

Description

PET detector output signal consistency correction method and system
Technical Field
The application relates to the field of medical instruments, in particular to a PET detector output signal consistency correction method in a PET-CT system.
Background
Positron Emission Tomography-Computed Tomography (PET-CT) equipment and Single-photon Emission Computed Tomography (SPECT) equipment are typical medical imaging equipment today. CT is mainly used for attenuation correction of PET, and the method has the advantages of short scanning time, low noise and the like, thereby replacing transmission scanning and greatly shortening the whole body imaging time. CT images can also be used for lesion localization.
And acquiring an attenuation coefficient of 511keV rays in tissues according to the CT image, and carrying out orthographic projection on the attenuation coefficient along a response line acquired by the PET data to obtain an attenuation correction factor of the PET emission data, thereby finishing the attenuation correction of the PET data and realizing the purpose of PET imaging.
The consistency of the output signals of the PET detectors directly affects the quality of PET images, so that a device for performing consistency correction on the output signals of the PET detectors is needed. There are two schemes for PET detector consistency correction in existing PET-CT systems.
Firstly, a CT host machine frame and a PET host machine frame are relatively independent, and a rod source system is arranged behind the PET host machine frame; the rod source system is arranged behind the PET main frame, which causes the defects of large volume of the PET main frame, inconvenient installation and transportation and high manufacturing cost.
Secondly, the CT host machine frame, the PET host machine frame and the rod source system are relatively independent; the CT host machine frame and the PET host machine frame are placed in a room, and the rod source system is placed in a room; the defect is that when the PET is corrected, the rod source system needs to be moved to the side of the PET rack from one place, and the use is inconvenient; each movement can produce a deviation in the position of the corrector-bar source, affecting the correction result and thus the image quality.
Disclosure of Invention
In view of this, the present application provides a method and a system for consistency correction of output signals of a PET detector, in which a rod source is used as a correction source to perform consistency correction on the PET detector, the rod source system is mounted on a CT rotating gantry, and the rotation of the CT rotating plate is used to realize 360-degree rotation of the rod source, thereby overcoming the defects of the prior art.
Specifically, the method is realized through the following technical scheme:
according to one aspect of the invention, a PET detector output signal consistency correction method is provided, which comprises the following steps:
installing a rod source system on a CT main frame, wherein the rod source system, a CT bulb tube and a CT detector are fixed on a rotating plate of the CT main frame; the rod source system is arranged on one side of a connecting line of the CT bulb tube and the CT detector;
fixing a PET detector on a PET main frame;
the rod source system drives a rod source to extend into the inner side of the PET main rack and cover the axial length of the PET detector, and when the rod source system drives the rod source to extend into the inner side of the PET main rack, the distance between the rod source and the surface of the PET detector is 1cm-7 cm;
the rotating plate of the CT main frame is driven to rotate circumferentially, the rotating plate drives the rod source to rotate, the PET detector performs data collection, and the PET data acquisition system analyzes the collected data to finish the consistency correction of output signals of the PET detector; and in the process that the rotating plate driving the CT main frame rotates in a circle and the PET detector collects data, the CT detector collects data to finish CT quality inspection.
Further, the rod source system drives a rod source to extend into the inner side of the PET main rack through a mechanical transmission mechanism; the mechanical transmission mechanism comprises a stepping motor, a connecting shaft and a linear lead screw module, the connecting shaft and the linear lead screw module are sequentially connected with the stepping motor, and a sliding block which is matched with the linear lead screw module and used for pushing the rod source is further arranged on the linear lead screw module.
Further, when the bar source system, the CT bulb tube and the CT detector are fixed on the rotating plate of the CT main frame, the CT bulb tube and the CT detector are oppositely installed, and the bar source system is arranged on one side of a connecting line of the CT bulb tube and the CT detector.
The invention also provides a PET-CT system suitable for the PET detector output signal consistency correction method, which comprises a CT main frame and a PET main frame;
a rod source system is arranged on the CT main frame, and the rod source system, the CT bulb tube and the CT detector are fixed on a rotating plate of the CT main frame; the rod source system is arranged on one side of a connecting line of the CT bulb tube and the CT detector;
a PET detector is fixed on the PET main rack;
a rod source is arranged in the rod source system, can extend into the inner side of the PET main rack and cover the axial length of the PET detector, and when the rod source extends into the inner side of the PET main rack, the distance between the rod source and the surface of the PET detector is 1cm-7 cm;
the rod source can rotate along with the rotating plate of the CT main frame in a circle, and is matched with the PET detector to collect data, so that the consistency of output signals of the PET detector can be corrected, and the CT quality inspection can be completed.
Furthermore, still be equipped with mechanical drive mechanism in the stick source system, mechanical drive mechanism includes step motor and the connecting axle and the straight line lead screw module that connect gradually with step motor, be equipped with again on the straight line lead screw module with the slider that is used for promoting the stick source of straight line lead screw module adaptation.
Further, the PET detectors are circumferentially mounted on the PET mainframe.
The technical scheme disclosed by the invention has the following beneficial effects: the defects of large volume of the PET-CT system, convenient installation and transportation part and high manufacturing cost in the prior art are overcome; the defects that the position of the mobile correcting rod source generates deviation, and the correcting result and the image quality are influenced are overcome.
Drawings
FIG. 1 is a flow chart of a PET detector coherence correction method according to an exemplary embodiment of the present application;
FIG. 2 is an apparatus flowchart illustrating a PET detector coherence correction method according to an exemplary embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a CT and PET mounting structure in a PET-CT system according to an exemplary embodiment of the present application;
FIG. 4 is a schematic structural diagram of a CT mainframe in a PET-CT system according to an exemplary embodiment of the present application;
FIG. 5 is a schematic diagram of a configuration of rod sources and PET detector locations in a PET-CT system according to an exemplary embodiment of the present application.
FIG. 6 is a top view schematic illustration of a PET-CT system rod source mechanical transmission according to an exemplary embodiment of the present application.
FIG. 7 is a schematic front view of a PET-CT system rod source mechanical transmission according to an exemplary embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Referring to fig. 1, the method for calibrating the consistency of the output signals of the PET detector provided by the present invention includes the following steps:
s100, installing a rod source system on a CT main frame, wherein the rod source system, the CT bulb tube and the CT detector are fixed on a rotating plate of the CT main frame.
The invention relates to a method for carrying out consistency correction on a PET detector by taking a rod source as a correction source. The invention combines the rod source system and the CT main frame, has the advantages of small volume and convenient debugging and transportation, and simplifies the equipment structure.
The rod source system, the CT bulb tube and the CT detector are all fixed on a rotating plate of the CT main frame, and the rod source of the rod source system can be combined with the PET detector to finish the quality inspection of the PET when the rotating plate rotates the CT to carry out the rotating quality inspection, namely the invention can finish the quality inspection of the PET and the CT at the same time, and the details are shown in the following embodiment.
S200, fixing the PET detector on a PET main rack, and enabling the PET detector and the CT detector to be arranged in parallel. That is, the installation direction of the PET detector fixed on the PET main frame is the same as the installation direction of the CT detector installed on the CT main frame, for example, the axial direction is the same. The CT main frame and the PET main frame are parallel in cross section, and the CT detector and the PET detector are also arranged and mounted in parallel.
S300, driving a rod source to extend into the inner side of the PET main frame by the rod source system, and covering the axial length of the PET detector. The whole rod source system is arranged on the rotating plate of the CT main frame, and the mechanical structure which can drive the rod source to stretch and retract is arranged to replace the structural mode which simply drives the rod source to rotate in the prior art because the rod source system and the PET detector have a spacing distance. The rod source system drives the rod source to stretch, the rod source can cover the axial length of the PET detector, and even if the stretching direction of the rod source is consistent with the stretching direction of the scanning bed and the axial direction of the PET main frame.
S400, driving a rotating plate of the CT main frame to rotate circumferentially, driving the rod source to rotate by the rotating plate, collecting data by the PET detector, analyzing the collected data by a PET data collecting system, and finishing consistency correction of output signals of the PET detector.
When the CT drive works, the PET works simultaneously; the rod source extends into the inner side of the PET detector, the CT bulb tube, the CT detector and the rod source rotate along with the rotating plate in a circumferential mode, when the rod source rotates on the inner side of the PET detector, the PET detector collects data, meanwhile, the PET data acquisition system collects and analyzes the data, the PET detector outputs the consistent data, and the purpose of PET output signal consistency correction is achieved. The PET data acquisition system is a PET-CT system with its own data processing system, and its function is the prior art, and will not be described herein.
In one embodiment, step S400 further includes: and in the process that the rotating plate driving the CT main frame rotates in a circle and the PET detector collects data, the CT detector collects data to finish CT quality inspection.
The rod source system, the CT bulb tube and the CT detector are all fixed on a rotating plate of the CT main frame, and the rod source of the rod source system can be combined with the PET detector to finish the quality inspection of the PET when the rotating plate rotates the CT to perform the rotating quality inspection. And meanwhile, the CT bulb tube and the CT detector operate and work, the CT detector acquires data fed back by X-rays, and a data acquisition system of the CT processes the acquired data to finish CT quality inspection. The invention can complete the quality inspection of PET and CT at the same time, thus saving the detection time.
In one embodiment, the rod source system drives the rod source to extend into the PET main frame through a mechanical transmission mechanism in step S300. The mechanical transmission mechanism comprises a stepping motor, a connecting shaft and a linear lead screw module, the connecting shaft and the linear lead screw module are sequentially connected with the stepping motor, and a sliding block which is matched with the linear lead screw module and used for pushing the rod source is further arranged on the linear lead screw module. When the rod source is not driven, the rod source is positioned in the cavity of the rod source system; when the rod source system drives the rod source, the stepping motor rotates to drive the connecting shaft, the connecting shaft is connected with the electric linear lead screw module, and the lead screw drives the sliding block to enable the rod source to extend out of the cavity of the rod source system until the rod source extends to the inner side of the PET detector, as shown in figures 6 and 7.
In one embodiment, when the rod source system drives the rod source to extend into the inner side of the PET main frame, the distance between the rod source and the surface of the PET detector is 1cm-7 cm. The distance between the rod source and the surface of the PET detector can be set to be 1cm or 7cm, or other values within a selected range according to setting requirements, so that the correction precision is improved.
In one embodiment, the rod source system, the CT bulb and the CT detector are mounted opposite to each other while being fixed on a rotating plate of the CT mainframe. The relative installation means that the connecting line of the CT bulb tube and the CT detector is the diameter of the rotating plate. And arranging the rod source system at one side of a connecting line of the CT bulb tube and the CT detector. The arrangement position of the rod source system does not interfere with the normal detection of CT.
The working flow of the bar source for the consistency correction of the output signals of the PET detector is shown in figure 2:
s10, starting scanning;
s20, making the rod come out of the cavity; namely, a mechanical transmission mechanism of the rod source system drives the rod source to extend out of a rod source system cavity;
s30, rotating the CT rotating plate; a rotating plate arranged on the CT main frame drives the rod source system and the rod source to rotate;
s40, PET data acquisition and analysis;
s50, stopping the rotation of the CT rotating plate;
s60, retracting the rod source into the cavity; a mechanical transmission mechanism of the rod source system drives the rod source to retract into the rod source system cavity;
and S70, ending.
Therefore, the invention solves the problems of large volume, inconvenient installation and transportation of the PET-CT system in the prior art; the invention solves the defect that the position of the correction rod source generates deviation due to movement when PET consistency correction is carried out, and the correction result is influenced, thereby influencing the image quality.
The invention also provides a PET-CT system suitable for the PET detector output signal consistency correction method, as shown in FIG. 3, comprising a CT main frame 1 and a PET main frame 2;
the bar source system 3 is installed on the CT main frame 1, and the bar source system 3, the CT bulb 11 and the CT detector 13 are fixed on a rotating plate 12 of the CT main frame 1, as shown in fig. 4.
As shown in fig. 4 and 5, a PET detector 21 is fixed on the PET mainframe 2, and the PET detector 21 is arranged in parallel with the CT detector 13; the rotation of the rotating plate 12 by the CT drives the bar source 31 to carry out PET consistency correction;
as shown in fig. 3, a rod source 31 is disposed inside the rod source system 3, and the rod source 31 can extend into the PET main frame 2 and make the rod source 31 cover the axial length of the PET detector 21;
referring to fig. 5, the rod source system 3 and the rod source 31 can rotate along with the rotating plate 12 of the CT mainframe 1 to cooperate with the PET detector 21 to perform data collection for completing the correction of the consistency of the output signals of the PET detector 21.
In the quality control process, because the PET rod source system 3 is arranged on the CT rotating plate 12, when the CT performs the rotating quality inspection, the rod source 31 goes out of the cavity to simultaneously complete the quality inspection of the PET, and can simultaneously complete the quality inspection of the PET and the CT.
Further, as shown in fig. 3, a mechanical transmission mechanism is further disposed in the rod source system 3, the mechanical transmission mechanism includes a stepping motor 36, and a connecting shaft 35 and a linear lead screw module 34 that are sequentially connected to the stepping motor 36, and the linear lead screw module 34 is further provided with a slider 32 adapted to the linear lead screw module 34 and used for pushing the rod source 31. When in work: when the rod source 31 is not driven, the rod source 31 is positioned in the rod source cavity 33 of the rod source system 3; when the rod source system 3 drives the rod source 31, the stepping motor 36 rotates to drive the connecting shaft 35, the connecting shaft 35 drives the linear lead screw module 34, and the lead screw drives the slider 32 to push the hand so that the rod source 31 extends out of the rod source cavity 33 of the rod source system 3 until the rod source 31 extends to the inner side of the PET detector 21, as shown in fig. 6 to 7.
Further, as shown in FIG. 5, when the rod source 31 extends into the PET mainframe 2, the distance between the rod source 31 and the surface of the PET detector 21 is 1cm-7 cm. Specifically, other values within the range may be selected according to the setting requirements, so that the correction accuracy is improved. The direction indicated by the arrow in the figure is the direction of rotation of the wand source 31.
In one embodiment, as shown in fig. 3 to 5, the CT bulb 11 and the CT detector 13 are installed opposite to each other, and the rod source system 3 is disposed at one side of the connection line between the CT bulb 11 and the CT detector 13. The PET detectors 21 are circumferentially arranged on the PET main frame 2, and the rotation of the rotating plate 12 of the CT drives the rod source 31 to perform PET consistency correction.
The implementation process of the functions and actions of each structure in the system is specifically described in the implementation process of the corresponding steps in the method, and is not described herein again.
In conclusion, the invention overcomes the defects of large volume of the PET-CT system, convenient installation and transportation part and high manufacturing cost in the prior art; the defects that the position of the mobile correcting rod source generates deviation, and the correcting result and the image quality are influenced are overcome. The invention directly installs the rod source system on the CT rotating plate, which can ensure the position precision and the rotating stability of the correction source.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims (6)

1. A PET detector output signal consistency correction method for a PET-CT system, comprising:
installing a rod source system on a CT main frame, wherein the rod source system, a CT bulb tube and a CT detector are fixed on a rotating plate of the CT main frame, and the rod source system is arranged on one side of a connecting line of the CT bulb tube and the CT detector;
fixing a PET detector on a PET main frame;
the rod source system drives a rod source to extend into the inner side of the PET main rack and cover the axial length of the PET detector, and when the rod source system drives the rod source to extend into the inner side of the PET main rack, the distance between the rod source and the surface of the PET detector is 1cm-7 cm;
the rotating plate of the CT main frame is driven to rotate circumferentially, the rotating plate drives the rod source to rotate, the PET detector performs data collection, and the PET data acquisition system analyzes the collected data to finish the consistency correction of output signals of the PET detector;
and in the process that the rotating plate driving the CT main frame rotates in a circle and the PET detector collects data, the CT detector collects data to finish CT quality inspection.
2. The PET detector output signal consistency correction method of claim 1, wherein the rod source system drives the rod sources to extend into the interior of the PET mainframe through a mechanical transmission mechanism; the mechanical transmission mechanism comprises a stepping motor, a connecting shaft and a linear lead screw module, the connecting shaft and the linear lead screw module are sequentially connected with the stepping motor, and a sliding block which is matched with the linear lead screw module and used for pushing the rod source is further arranged on the linear lead screw module.
3. The method according to claim 1, wherein the bar source system, the CT bulb and the CT detector are mounted opposite to each other while being fixed to a rotating plate of a CT mainframe, and the bar source system is disposed on one side of a line connecting the CT bulb and the CT detector.
4. A PET-CT system suitable for the PET detector output signal consistency correction method is characterized by comprising a CT main frame and a PET main frame;
the bar source system, the CT bulb tube and the CT detector are fixed on a rotating plate of the CT main frame, and the bar source system is arranged on one side of a connecting line of the CT bulb tube and the CT detector;
a PET detector is fixed on the PET main rack;
a rod source is arranged in the rod source system, and can extend into the inner side of the PET main rack and cover the axial length of the PET detector; when the rod source extends into the inner side of the PET main rack, the distance between the rod source and the surface of the PET detector is 1cm-7 cm;
the rod source can rotate along with the rotating plate of the CT main frame in a circle, and is matched with the PET detector to collect data, so that the consistency of output signals of the PET detector can be corrected, and the CT quality inspection can be completed.
5. The PET-CT system of claim 4, wherein the rod source system is provided with a mechanical transmission mechanism, the mechanical transmission mechanism comprises a stepping motor, a connecting shaft and a linear lead screw module, the connecting shaft is sequentially connected with the stepping motor, and the linear lead screw module is provided with a slide block which is matched with the linear lead screw module and used for pushing the rod source.
6. The PET-CT system of claim 5, wherein the PET detectors are circumferentially mounted on a PET mainframe.
CN201610836797.8A 2016-09-20 2016-09-20 PET detector output signal consistency correction method and system Expired - Fee Related CN106344059B (en)

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EP3503810A4 (en) 2016-09-30 2019-08-14 Shenzhen United Imaging Healthcare Co., Ltd. Method and system for calibrating an imaging system
CN107307878B (en) * 2017-06-30 2020-12-25 上海联影医疗科技股份有限公司 CT system temperature control method

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