CN113520434B - Energy spectrum rapid imaging cone beam CT system suitable for small animals and design method - Google Patents
Energy spectrum rapid imaging cone beam CT system suitable for small animals and design method Download PDFInfo
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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]
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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
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4064—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis specially adapted for producing a particular type of beam
- A61B6/4085—Cone-beams
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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
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
- A61B6/4452—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being able to move relative to each other
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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
- A61B6/50—Clinical applications
- A61B6/508—Clinical applications for non-human patients
Abstract
The invention discloses an energy spectrum rapid imaging cone beam CT system and a design method suitable for small animals. And carrying out physical simulation according to the attribute information of the rotating equipment which rotates along with the rotating platform to determine the rotation parameters and selecting a driving unit adapting to the rotation parameters, so that the driving unit can accurately drive the CT scanning imaging unit to rotate, and multi-dimensional scanning of the test sample is realized. The control signal and the collected data are processed by the singlechip and the on-board PC, so that the processing speed is high, and the safety is ensured. Based on the method, compared with the existing small animal cone beam micro CT, the designed energy spectrum rapid imaging cone beam CT system has higher efficiency, higher definition resolution, energy spectrum imaging realization and higher mobility.
Description
Technical Field
The invention belongs to the field of CT imaging, and particularly relates to an energy spectrum rapid imaging cone beam CT system suitable for small animals and a design method.
Background
Computed tomography energy spectrum imaging is one of research hotspots in the current CT field, and many cone beam CT imaging systems exist in the prior art, such as a multifunctional cone beam CT imaging system disclosed in patent application publication No. CN105167796A, such as a degree-of-freedom animal cone beam CT imaging system disclosed in patent application publication No. CN 107115120A. Compared with the traditional CT, the energy spectrum CT utilizes the difference of absorption capacities of substances under different X-ray energies, can provide more abundant tissue resolution information than the traditional CT, and has a plurality of advantages of improving image quality, inhibiting beam hardening artifact, reducing radiation dose and the like.
In CT medical measurement and imaging technology of small objects and living small animals, small animal cone beam micro CT can be used for imaging mice and rats very conveniently, and can be widely applied to neurology, oncology, cardiovascular diseases and drug research and development.
Because the existing small animal cone beam micro CT scanning time is longer, the reconstruction quality is influenced by the scanning process, and the three-energy imaging cannot be performed, namely the energy spectrum imaging cannot be realized, so that the requirements of improving the scanning speed, realizing the energy spectrum imaging and quickly reconstructing are common on the premise of ensuring the imaging quality.
In view of the above, there is an urgent need for a cone beam CT system for rapid energy spectrum imaging of small animals.
Disclosure of Invention
In view of the above, the present invention aims to provide a cone beam CT system for rapid energy spectrum imaging of small animals and a design method thereof, wherein the designed cone beam CT system is light and convenient, and has the capabilities of rapid scanning, high resolution, three-energy imaging and on-board PC on-site direct image reconstruction.
In order to achieve the above object, the present invention provides the following technical solutions:
in a first aspect, a method for designing a cone beam CT system for rapid spectral imaging of small animals, comprising the steps of:
at least three groups of CT scanning imaging units with different emergent energy spectrums for energy spectrum imaging and a rotary table with a middle through hole are selected, and the CT scanning imaging units are arranged on one side of the rotary table in a uniform distribution manner;
a laser collimation unit consisting of at least three lasers is arranged on the CT scanning imaging unit and the rotary table, and the CT scanning imaging unit is calibrated by the laser collimation unit;
according to the attribute information of the rotating assembly which is arranged on the rotating platform and rotates together with the rotating platform, carrying out physical simulation to determine the rotating parameters, selecting a rotating driving unit which is matched with the rotating parameters and installing the rotating driving unit on the other side of the rotating platform;
control parameters of a CT scanning imaging unit and a rotary driving unit are designed according to imaging requirements of a cone beam CT system, and control instructions are written according to the control parameters and burnt into a singlechip;
the inclinometer is selected and fixedly mounted to the rotary table, the on-board PC is selected and detachably mounted to the other side of the rotary table, the singlechip is selected and mounted to the stator end of the rotary driving unit, and the CT scanning imaging unit, the inclinometer and the on-board PC are connected to the singlechip at the stator end through hollow slip ring wiring.
Preferably, each group of CT scanning imaging units comprises a generator and a detector, wherein the generator is used for emitting X-rays, the detector is used for receiving X-ray signals transmitted by the imaging sample, and the generator and the detector are distributed at two ends of the center diameter of the table top of the rotary table.
Preferably, the laser collimation unit comprises three line lasers, wherein two line lasers are respectively arranged on the generator and the detector of the CT scanning imaging unit, the other line laser is arranged at the center of the rotary table, the intersection point of laser emission convergence of the three line lasers is used as the origin of coordinates of calibration coordinates, and the generator and the detector belonging to the same CT scanning imaging unit are calibrated by using the calibration coordinates, so that the center of a light beam emitted by the generator is aligned with the origin of coordinates.
Preferably, the calibration coordinate system constructed using the laser collimation unit is also used as a positioning reference for the test sample to be placed in the center of the scan.
Preferably, the attribute information of the rotating assembly includes: the CT scanning imaging unit comprises the weight and the gravity center of an imaging component, the weight and the gravity center of a rotor end of the rotary table and the weight and the gravity center of an inclinometer;
the rotation parameters comprise rotation inertia and rotation speed.
Preferably, the driving unit comprises a hollow rotary bearing, a servo motor and a servo motor driver, the rotary table is arranged at the rotor end of the hollow rotary bearing, the servo motor is arranged at the other side of the hollow rotary bearing, the servo motor driver is connected to the servo motor and the singlechip through cables, and the singlechip drives the servo motor by controlling the servo motor driver;
the singlechip controls the frequency of trigger signals of the generator and the detector in the CT scanning imaging unit so as to control the synchronous work of the generator and the detector; the singlechip controls the rotation speed and the rotation period of the servo motor in the driving unit.
Preferably, the on-board PC is used as an imaging processing unit, receives the projection data collected by the CT scanning imaging unit and the angle data collected by the inclinometer through a network cable, and performs energy spectrum imaging based on the received projection data and angle data;
the on-board PC is used as an imaging processing unit, outputs a reconstructed image obtained through energy spectrum imaging to connected external equipment through a network cable integrated into the slip ring, and receives remote control of the external equipment on the imaging processing unit.
Preferably, a hollow annular imaging unit with other modes is arranged on the other side of the rotary table opposite to the CT scanning imaging unit, the test sample is conveyed to the operation space of the hollow annular imaging unit on the other side of the rotary table through the middle through hole of the rotary table, and the hollow annular imaging unit is used for imaging with other modes.
Preferably, a two-way emergency stop switch is designed for the energy spectrum rapid imaging cone beam CT system and is used for controlling the generator and the servo motor controller to simultaneously and emergently stop working;
an X-ray radiation shielding shell is designed for the energy spectrum rapid imaging cone beam CT system and is used for preventing the X-rays emitted by the generator from being emitted.
In a second aspect, a spectral rapid imaging cone beam CT system suitable for small animals, the spectral rapid imaging cone beam CT system being designed by the design method according to the first aspect.
Compared with the prior art, the technical scheme provided by the invention has at least the following effects:
by selecting different CT scanning imaging units comprising generators and detectors for obtaining scanning signals, various requirements and use environments for three-energy spectrum imaging can be met. And carrying out physical simulation according to the attribute information of the rotor end assembly which rotates along with the rotating table to determine the rotation parameters and selecting a driving unit adapting to the rotation parameters, so that the driving unit can drive the CT scanning imaging unit to stably rotate with high precision, realize multidimensional scanning of the test sample, and avoid jitter and inhibit control errors. The control signal and the collected data are processed by the singlechip and the on-board PC, so that the processing speed is high, and the safety is ensured. Based on the method, compared with the existing small animal cone beam micro CT, the designed energy spectrum rapid imaging cone beam CT system has higher efficiency, higher definition resolution, energy spectrum imaging realization and higher mobility.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a design method of a cone beam CT system for rapid energy spectrum imaging of small animals, which is provided by an embodiment;
FIG. 2 is a schematic structural diagram of a cone beam CT system for rapid energy spectrum imaging of small animals according to an embodiment;
in FIG. 2, 1-generator, 2-laser, 3-detector, 4-on-board PC, 5-rotating platform, 6-inclinometer, 7-hollow slewing bearing, 8-slip ring, 9-servo motor, 10-servo motor driver, 11-singlechip, 12-shielding shell, 13-scram switch.
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 detailed description is presented by way of example only and is not intended to limit the scope of the invention.
The existing small animal cone beam micro CT scanning time is long, the small animal cone beam micro CT scanning cannot rotate, detection data for three-energy imaging can be obtained only by adjusting scanning for multiple times when three-energy imaging is carried out, the time consumption is long, and complex motion monitoring is needed for living imaging so as to ensure that the motion error of a sample between three scanning imaging is compensated. In order to solve the problem, the embodiment of the invention provides a design method of an energy spectrum rapid imaging cone beam CT system suitable for small animals. As shown in fig. 1 and 2, the design method of the energy spectrum rapid imaging cone beam CT system suitable for small animals provided in the embodiment includes the following steps:
step 1, selecting at least three groups of CT scanning imaging units with different emergent energy spectrums for energy spectrum imaging and a rotary table 5 with a middle through hole, wherein the CT scanning imaging units are uniformly distributed on one side of the rotary table 5.
In order to realize three-energy imaging, a plurality of groups of CT scanning imaging units can be selected for emitting X-rays with different energy spectrums, in the embodiment, different voltages can be set by the three groups of generators or a light outlet stop block is added to realize different emission energy spectrums, and then three-dimensional reconstruction is carried out according to an acquired X-ray projection image to obtain a reconstructed image.
In the embodiment, a rotary table 5 with a through hole in the center is selected, the detection units are uniformly distributed on one side of the rotary table 5, the rotary table 5 can realize continuous rotation, and the CT scanning imaging unit arranged on the rotary table 5 is driven to realize continuous detection of a test sample to obtain scanning detection signals for three-energy imaging. In addition, the middle through hole of the rotary table 5 provides a transport channel, so that test samples can be conveniently and directly transported from one side of the rotary table 5 to the other side, and multi-mode measurement is realized.
Each group of CT scanning imaging units comprises a generator 1 and a detector 3, wherein the generator 1 is used for emitting X-rays, the detector 3 is used for receiving the X-rays transmitted by an imaging sample, and the generator 1 and the detector 3 are distributed at two ends of the center diameter of the surface of the rotary table 5. Alternatively, the generator 1 may employ an X-ray tube and the detector 3 may be a flat panel detector 3 consisting of deposited scintillator material and photodiodes. In the embodiment, the diameter of the over-center point on the surface of the rotating table 5 is taken as the pitch diameter of the surface of the rotating table 5, and the generator 1 and the detector 3 are distributed at two ends of the pitch diameter of the surface of the rotating table 5, so that the X-rays emitted by the generator 1 can be received by the detector 3. Alternatively, three groups of CT scanning imaging units may be selected, where each group of CT scanning imaging units is uniformly arranged and fixed on the surface of the rotary table 5 at 120 ° and the three groups of CT scanning imaging units implement detection of three different energy spectrums, so as to obtain three groups of X-ray projection images with different energies.
And 2, installing a laser collimation unit consisting of at least two line lasers 2 on the CT scanning imaging unit and the rotary table 5, and installing and calibrating the CT scanning imaging unit by using the laser collimation unit.
In order to make the relative positions of the generator 1 and the probe in the installed CT scanning imaging unit accurate so as to realize accurate acquisition of scanning probe signals, the CT scanning imaging unit needs to be subjected to position calibration during installation. In an embodiment, a laser collimation unit consisting of at least two line lasers 2 is used to achieve the position calibration of the CT scanning imaging unit.
In one embodiment, when the line laser 2 is a word line laser or a cross line laser, the laser collimation unit may include three line lasers 2, where two line lasers 2 are respectively disposed on the generator 1 and the detector 3 of a group of CT scanning imaging units, another line laser 2 is disposed at the center of the rotary table 5, an intersection point where the laser beams emitted by the three line lasers 2 converge is used as a coordinate origin of the calibration coordinates, the three laser lines are respectively used as three coordinate axes of the three calibration coordinates, and the calibration coordinates are used to calibrate the generator 1 and the detector 3 belonging to the same CT scanning imaging unit, so that the center of the X-ray beam emitted by the generator 1 is aligned with the coordinate origin. I.e. the scanning center position is determined by the laser collimation unit.
In one embodiment, when the line laser 2 is a cross line laser, the laser collimation unit may include two line lasers 2, where the two line lasers 2 are respectively disposed on the generator 1 and the detector 3 of one set of CT scanning imaging units, and of course, one line laser 2 may be disposed on the generator 1 or the detector 3 of one set of CT scanning imaging units, and the other line laser 2 is disposed at the center of the rotary table, and an intersection point where the laser emitted by the two line lasers converges is used as a coordinate origin of calibration coordinates, and the generator and the detector belonging to the same CT scanning imaging unit are calibrated by using the calibration coordinates, so that the center of the beam emitted by the generator is aligned with the coordinate origin.
In addition to the laser alignment unit being used for position alignment of the CT scanning imaging unit, the alignment coordinate system constructed by the laser alignment unit is also used as an alignment reference for placing the test sample in the scanning center position. When a test sample is tested, in order to realize accurate detection of the test sample, the test sample needs to be placed at the scanning center position, and the laser intersection point generated by the laser collimation unit provided by the embodiment is used as the scanning center position, so that the placing speed of the test sample is greatly improved for placing the test sample as a correction reference.
And 3, performing physical simulation according to the attribute information of the rotating assembly which is arranged on the rotating platform 5 and rotates together with the rotating platform 5 to determine the rotating parameters, selecting a rotating driving unit which is adaptive to the rotating parameters, and installing the rotating driving unit on the other side of the rotating platform 5.
When designing a rotation driving unit for driving the rotation table 5 to rotate, in order to achieve normal rotation of the rotation table 5 and save driving resources, a physical simulation is performed on a rotation process before selecting the rotation driving unit, rotation parameters of the rotation process are calculated through the simulation, and an adaptive rotation driving unit is selected according to the rotation parameters.
In an embodiment, the rotating assembly arranged on the rotating table 5 and rotating together with the rotating table 5 comprises imaging equipment, such as a generator 1 and a detector 3 for receiving X-rays, which is comprised by a CT scanning imaging unit, further comprises a weight and a center of gravity of a rotor end of the rotating table, further comprises an inclinometer 6 arranged on the rotating table 5, and when other testing modes are added, further comprises equipment for realizing the other testing modes and being mounted on the rotating table 5.
Based on this, the attribute information of the rotating apparatus includes: the CT scanning imaging unit includes the weight and the center of gravity of the imaging device, the weight and the center of gravity of the rotary table 5, and the weight and the center of gravity of the inclinometer. The physical simulation is performed according to the weight and the gravity center of the equipment to determine rotation parameters, wherein the rotation parameters comprise rotation inertia and rotation speed.
The rotary driving unit comprises a hollow rotary bearing 7, a servo motor 9 and a servo motor driver 10, the rotary table 5 is mounted at the rotor end of the hollow rotary bearing 7, the servo motor 9 is mounted at the other side of the hollow rotary bearing 7, the servo motor driver 10 is connected to the servo motor 9 and a single chip microcomputer 11 through a cable, and the single chip microcomputer 11 drives the servo motor 9 by controlling the servo motor driver 10.
In the rotation driving unit, a servo motor 9 is fixed to a stator end of a hollow slewing bearing 7 as a main execution rotating member, does not rotate along with a turntable 5, is driven by a servo motor driver 10, and is not in a scanning field of view. The rotation speed and rotation period of the servo motor 9 are controlled by a single chip microcomputer 11.
And 4, designing control parameters of a CT scanning imaging unit and a rotary driving unit according to the imaging requirement of the cone beam CT system, writing control instructions according to the control parameters, and burning the control instructions into the singlechip 11.
In order to realize the interference-free control of the CT scanning imaging unit and the rotary driving unit, control parameters of the CT scanning imaging unit and the rotary driving unit are designed in advance according to the imaging requirement of the cone beam CT system, and the control parameters are burnt into the singlechip 11 by programming layer control instructions, so that when the control instructions are output to the CT scanning imaging unit and the rotary driving unit to control the work of the two units. Alternatively, the singlechip 11 may be an ARM singlechip.
For the CT scanning imaging unit, the singlechip 11 controls the frequency of trigger signals of the generator 1 and the detector 3 in the CT scanning imaging unit so as to control the generator 1 and the detector 3 to synchronously work. For the driving unit, the singlechip 11 controls the rotation speed and the rotation period of the servo motor 9 in the driving unit.
And 5, selecting an inclinometer 6 and fixedly mounting the inclinometer to the rotary table 5, selecting an onboard PC4 and detachably mounting the inclinometer to the other side of the rotary table 5, selecting a singlechip 11 and mounting the inclinometer to a stator end, and connecting a CT scanning imaging unit, the inclinometer, the onboard PC4 and other rotary platen-mounted components to the singlechip 11 at the stator end through a hollow slip ring 8 wiring.
The inclinometer 6 is used to acquire angle data of the rotational stage 5, which is used for three-dimensional reconstruction together with projection data (scan detection signals) acquired by the CT scan imaging unit. The inclinometer can be fixedly arranged on the side surface of the rotary table 5, so that the testing sample scanning working space is not occupied, and the testing sample scanning is not influenced.
The on-board PC4 is directly detachably mounted as part of the system on the other side of the rotational table 5, i.e. the non-working space of the CT scan imaging. Because the cost of the on-board PC4 is low, when the processing capacity needs to be increased, one on-board PC4 can be directly replaced, and other parts of the system do not need to be moved, so that the system maintenance is convenient.
In order to cooperate with the rotation of the hollow rotary table 5, the rotation continuous measurement is realized, the CT scanning imaging unit and the on-board PC4 (personal computer ) are connected through a network cable, and meanwhile, the inclinometer and the on-board PC4 are connected, so that the connection between the on-board PC4 and the CT scanning imaging unit and the inclinometer is realized, and projection data and angle data can be received in real time. In the embodiment, the CT scanning imaging unit and the singlechip 11 are connected in a wiring way through the hollow slip ring 8.
In the embodiment, the on-board PC4 is used as an imaging processing unit, receives the projection data collected by the CT scanning imaging unit and the angle data collected by the inclinometer through the network cable, and performs energy spectrum imaging based on the received projection data and angle data, so that the imaging processing unit carried by the system directly performs energy spectrum imaging on the projection data and the angle data, thereby reducing the data transmission quantity, improving the speed and instantaneity of acquiring the reconstructed image, and realizing remote control.
In the embodiment, the onboard PC4 serves as an imaging processing unit, outputs a reconstructed image obtained by energy spectrum imaging to the connected external device through a network cable integrated into the slip ring 7, and receives remote control of the imaging processing unit by the external device.
In the above design method, a hollow annular imaging unit with other modes is further designed on the other side of the rotary table 5 opposite to the CT scanning imaging unit, the test sample is conveyed to the operation space of the hollow annular imaging unit on the other side of the rotary table 5 through the middle through hole of the rotary table 5, and imaging with other modes is performed by using the hollow annular imaging unit.
In the design method, a two-way emergency stop switch 13 is designed for the energy spectrum rapid imaging cone beam CT system and is used for controlling the generator 1 and the servo motor driver 10 to simultaneously and emergently stop working. In order to prevent the X-rays emitted from the generator 1 from damaging the human body and to prevent the servo motor driver 10 from driving the rotary table 5 to rotate through the servo motor 9 and the hollow rotary bearing 7 to bring about potential safety hazards to the human body when an emergency occurs during the test.
In the above design method, the X-ray radiation shielding housing 12 is designed for the energy spectrum fast imaging cone beam CT system, and is used for preventing the X-rays emitted from the generator 1 from being emitted. Alternatively, the shield shell 12 may be made of lead material.
Compared with the existing small animal cone beam micro CT, the energy spectrum rapid imaging cone beam CT system designed based on the design method has higher efficiency, higher definition resolution, capability of realizing energy spectrum imaging and higher mobility.
The foregoing detailed description of the preferred embodiments and advantages of the invention will be appreciated that the foregoing description is merely illustrative of the presently preferred embodiments of the invention, and that no changes, additions, substitutions and equivalents of those embodiments are intended to be included within the scope of the invention.
Claims (8)
1. The design method of the energy spectrum rapid imaging cone beam CT system suitable for the small animals is characterized by comprising the following steps of:
at least three groups of CT scanning imaging units with different emergent energy spectrums and a rotary table with a middle through hole are selected for energy spectrum imaging, the CT scanning imaging units are installed and uniformly distributed on one side of the rotary table, each group of CT scanning imaging units comprises a generator and a detector, the generator is used for emitting X-rays, the detector is used for receiving X-ray signals transmitted by imaging samples, and the generator and the detector are distributed at two ends of the middle diameter of the rotary table top;
the method comprises the steps that a laser collimation unit consisting of at least two line lasers is arranged on a CT scanning imaging unit and a rotary table, the CT scanning imaging unit is calibrated by the laser collimation unit, wherein the laser collimation unit comprises three line lasers, two line lasers are respectively arranged on a generator and a detector of a group of CT scanning imaging units, the other line laser is arranged at the center of the rotary table, an intersection point where laser emitted by the three line lasers converges is used as a coordinate origin of calibration coordinates, and the generator and the detector belonging to the same CT scanning imaging unit are calibrated by the calibration coordinates, so that the center of a light beam emitted by the generator is aligned with the coordinate origin;
according to the attribute information of the rotating assembly which is arranged on the rotating platform and rotates together with the rotating platform, carrying out physical simulation to determine the rotating parameters, selecting a rotating driving unit which is matched with the rotating parameters and installing the rotating driving unit on the other side of the rotating platform;
control parameters of a CT scanning imaging unit and a rotary driving unit are designed according to imaging requirements of a cone beam CT system, and control instructions are written according to the control parameters and burnt into a singlechip;
the inclinometer is selected and fixedly mounted to the rotary table, the on-board PC is selected and detachably mounted to the other side of the rotary table, the singlechip is selected and mounted to the stator end of the rotary driving unit, and the CT scanning imaging unit, the inclinometer and the on-board PC are connected to the singlechip at the stator end through hollow slip ring wiring.
2. The method of claim 1, wherein the calibration coordinate system constructed by the laser collimator unit is used as a positioning reference for the test sample at the scanning center.
3. The method for designing a cone beam CT system for rapid spectral imaging of small animals according to claim 1, wherein the attribute information of the rotating assembly comprises: the CT scanning imaging unit comprises the weight and the gravity center of an imaging component, the weight and the gravity center of a rotor end of the rotary table and the weight and the gravity center of an inclinometer;
the rotation parameters comprise rotation inertia and rotation speed.
4. The method for designing a cone beam CT system for rapid imaging of energy spectrum of small animals according to claim 1, wherein the driving unit comprises a hollow slewing bearing, a servo motor and a servo motor driver, the turntable is mounted on the rotor end of the hollow slewing bearing, the servo motor is mounted on the other side of the hollow slewing bearing, the servo motor driver is connected to the servo motor and the singlechip through cables, and the singlechip drives the servo motor by controlling the servo motor driver;
the singlechip controls the frequency of trigger signals of the generator and the detector in the CT scanning imaging unit so as to control the synchronous work of the generator and the detector; the singlechip controls the rotation speed and the rotation period of the servo motor in the driving unit.
5. The method for designing a cone beam CT system for rapid energy spectrum imaging of small animals according to claim 1, wherein the onboard PC is used as an imaging processing unit, receives the projection data collected by the CT scanning imaging unit and the angle data collected by the inclinometer via a network cable, and performs energy spectrum imaging based on the received projection data and angle data;
the on-board PC is used as an imaging processing unit, outputs a reconstructed image obtained through energy spectrum imaging to connected external equipment through a network cable integrated into the slip ring, and receives remote control of the external equipment on the imaging processing unit.
6. The method for designing a cone beam CT system for rapid energy spectrum imaging of small animals according to claim 1, wherein a hollow annular imaging unit having other modes is mounted on the other side of the rotary table opposite to the CT scanning imaging unit, the test sample is transferred to the operation space of the hollow annular imaging unit on the other side of the rotary table through the middle through hole of the rotary table, and the hollow annular imaging unit is used for imaging having other modes.
7. The method for designing a rapid energy spectrum imaging cone beam CT system for small animals according to any one of claims 1 to 6, wherein a two-way emergency stop switch is designed for the rapid energy spectrum imaging cone beam CT system for controlling the generator and the servo motor controller to simultaneously stop working emergently;
an X-ray radiation shielding shell is designed for the energy spectrum rapid imaging cone beam CT system and is used for preventing the X-rays emitted by the generator from being emitted.
8. A spectroscopic fast imaging cone beam CT system suitable for small animals, characterized in that the spectroscopic fast imaging cone beam CT system is designed as a result of the design method according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110619601.0A CN113520434B (en) | 2021-06-03 | 2021-06-03 | Energy spectrum rapid imaging cone beam CT system suitable for small animals and design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110619601.0A CN113520434B (en) | 2021-06-03 | 2021-06-03 | Energy spectrum rapid imaging cone beam CT system suitable for small animals and design method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113520434A CN113520434A (en) | 2021-10-22 |
| CN113520434B true CN113520434B (en) | 2024-02-13 |
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