CN109946327A - A kind of location triggered control method for CT scan and the system for implementing this method - Google Patents
A kind of location triggered control method for CT scan and the system for implementing this method Download PDFInfo
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- CN109946327A CN109946327A CN201910225221.1A CN201910225221A CN109946327A CN 109946327 A CN109946327 A CN 109946327A CN 201910225221 A CN201910225221 A CN 201910225221A CN 109946327 A CN109946327 A CN 109946327A
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Abstract
The present invention relates to a kind of location triggered control methods for CT scan, and steps are as follows: the location information of encoder real-time measurement sample stage rotary shaft (and lifting shaft) simultaneously exports pulse；Detector is taken pictures acquired projections image；Host computer receives projected image；Controller mediate.This method can directly carry out the control of trigger signal by controller, realize the other rapid location triggering of Millisecond, location information is accurate, improves the reconstruction quality of 3-D image, and simplify structure and signal analysis process.
Description
Technical field
The invention belongs to CT technical field, especially a kind of location triggered control method and the implementation party for CT scan
The system of method.
Background technique
In order to meet the needs for rebuilding 3-D image, CT scan needs sample to be revolved in 360 ° around certain axle center
Turn, and shoots the projected image of different angle (being hereafter all referred to as " position ", corresponding title " location triggered ") (hereinafter referred to as
" frame "), it then deals with and rebuilds using position and projected image by computer software, obtain 3-D image, during this,
The accurate matching of the two is to guarantee the prerequisite of reconstructed image quality.
Existing CT scan uses mode below:
One, " stop mode is walked ", sample rotates to predetermined position, that is, stop motion, then detector shoots a frame.Such side
Formula can obtain sufficiently accurate location information, but CT scan needs to shoot a large amount of frames, in the process the starting repeatedly of rotary shaft
And stopping, elapsed time, the extension of sweep time is caused, while also increasing the loss of equipment.Further, since this control
Mode belongs to closed-loop control, and kinematic axis may be constantly in adjustment state, influences the stability of positioning.
Two, it allows sample to remain a constant speed rotation, shoots detector according to fixed time interval, record time started and knot
The beam time, so that sample position when shooting each time be calculated by Velocity-time relationship.Under this mode, sample connects
Continuous rotation, but the speed of actually sample stage rotation can not be constant, there is fluctuation, which results in theoretical position is calculated
Setting cannot coincide with corresponding frame well, influence reconstruction quality.
Three, increase sensor on the basis of mode two, detect the angular speed of rotary shaft, and do a series of operations to it,
Obtain location information.This mode further improves the accuracy of location information, but still is by other Physical Quantity Calculations
It obtains, there are errors, limited for rebuilding effect promoting；And there is hysteresis quality in time, while needing to increase additional
Sensor and corresponding soft and hardware equipment.
Currently, with the development of technology, high-resolution, high position precision position sensor gradually popularize, motion control
The function of device is more perfect, and cooperating can be used to do the location triggered control of CT scan.
However for higher sample, it only is unable to get sample overall picture with CT scan, because shooting resolution ratio meeting
Under conditions of, sample has exceeded the coverage area of X-ray cone-beam, and only rotation is inadequate, needs to guarantee using CT scan
Sample can not only be pivoted, moreover it is possible to and upper and lower elevating movement is done, can all being penetrated by cone-beam for sample is projected,
Then image is rebuild again.
In order to rebuild the 3-D image of higher sample, in addition to rotary position information to be obtained, while height position is also obtained
Confidence breath.Similar to CT scan, have at present:
One, " stop mode is walked ", i.e., after sample rotates and lifting in place, all stop motions, detector shoots image.Similarly
There is a problem of that CT scan is identical.
Two, it allows sample to remain a constant speed rotation, while at the uniform velocity going up and down, shoot detector according to fixed time interval, remember
Starting and end time is recorded, so that sample rotates position when shooting each time be calculated by Velocity-time relationship
And height and position.Similarly, the speed of sample stage rotation and the speed of lifting can not be constant, there is fluctuation.
Pass through retrieval, discovery such as next chapter patent publication us relevant to present patent application.
Scan control method, scan controller and the CT machine (CN 103284740B) of CT machine disclose a kind of CT machine
Scan control method, scan controller and CT machine.Wherein, method includes: the angular speed of real-time measurement CT machine rotary frame；?
In each scan period, the angular speed measured in real time is integrated since initial zero, obtains working as rotary frame
Preceding rotation angle；Judge whether the present rotation angel degree reaches Current projection corresponding with Current projection position angle, if reaching,
Then trigger the exposure and/or acquisition at Current projection angle.Technical solution provided by the invention is based on location triggered mode and realizes scanning
Control, and under the premise of lower cost, further promote the quality of reconstruction image.
By comparison, there is essential difference in present patent application and above-mentioned patent publication us.
Summary of the invention
It is an object of the invention to overcome above-mentioned shortcoming, a kind of location triggered control for CT scan is provided
Method processed and the system for implementing this method, this method can directly be carried out the control of trigger signal by controller, realize milli
The rapid location triggering of second rank, location information is accurate, improves the reconstruction quality of 3-D image, and simplify structure and letter
Number analytic process.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of location triggered control method for CT scan, steps are as follows:
The location information of encoder real-time measurement sample stage rotary shaft simultaneously exports pulse；Detector is taken pictures acquired projections figure
Picture；Host computer receives projected image；Controller mediate.
Moreover, the encoder is the encoder or grating scale of rotation or straight line.
Moreover, the method is realized by High-Speed Hardware port, location determination is not carried out by upper computer software, so prolonging
When very little, only in several milliseconds of ranks.
Moreover, the method rotates speed for the shooting time of each frame, the spacing distance of trigger position and sample stage
Speed is spent, needs to meet the frame number of CT scan needs and the performance indicator of detector, detector shoots a frame and needs certain exposure
Between light time and data processing time.
Implement as described above for CT scan location triggered control method system, the system comprises encoder,
Detector, host computer and controller, the controller and encoder, detector, host computer are connected setting, the detector
Also be connected with host computer setting；The encoder is capable of the location information of real-time measurement sample stage rotary shaft and defeated to controller
Pulse out, the controller can receive pulse and issue trigger signal to detector, and the detector is able to detect that triggering
Signal simultaneously shoots a frame and sends host computer to, and all frames can be rebuild synthesis 3-D image by the host computer, restores sample
Internal structure.
A kind of location triggered control method for CT scan, specific steps are as follows:
By the location information of rotary/shaft encoder real-time measurement rotary shaft, pulse is exported to controller；
Controller receives pulse, and is compared with a series of pre-set trigger positions, when the two is consistent, passes through
The port I/O issues trigger signal to detector；
Detector detects trigger signal, shoots a frame and sends host computer to；
So far a location triggered take pictures process completion, when pulse reach next scheduled position when, trigger next frame
Shoot process；
All frames can be rebuild synthesis 3-D image by host computer, restore sample interior structure.
Implement the system as described above for the location triggered control method of CT scan, the system comprises rotary shaft volumes
Code device, controller, detector and host computer, the controller and encoder, detector, host computer are connected setting, described
Detector is also connected with host computer setting；The encoder is capable of the location information of real-time measurement sample stage rotary shaft and to control
Device processed exports pulse, and the controller can receive pulse and issue trigger signal to detector, and the detector is able to detect
It to trigger signal and shoots a frame and sends host computer to, all frames can be rebuild synthesis 3-D image by the host computer, multiple
Raw sample internal structure；
The controller includes signal processing module, position comparison module, the port I/O, triggering port and trigger position mould
Block, the input terminal of the signal processing module are connected setting with the output end of rotary/shaft encoder, the signal processing module
Output end is connected setting with the input terminal of position comparison module, and the output end of the position comparison module is connected with the port I/O
Setting, the port I/O are connected setting by triggering port with detector, the trigger position module also with position comparison module
Be connected setting.
A kind of location triggered control method for CT scan, specific steps are as follows:
The location information of rotary/shaft encoder real-time measurement rotary shaft exports pulse；Meanwhile it going up and down shaft encoder and surveying in real time
The location information of lifting shaft is measured, pulse is exported；
Controller receives pulse, and after signal processing, rotary shaft pulse and a series of pre-set trigger positions are carried out
Compare, when pulse reaches a predetermined position, trigger signal is issued to detector by triggering port I；Meanwhile passing through triggering
Port II issues trigger signal to latch port；
Latch port detects trigger signal, latches current lifting shaft location information, and report to host computer；Meanwhile it visiting
It surveys device and detects trigger signal, shoot a frame and send host computer to.
So far a location triggered take pictures process completion, when pulse reach next scheduled position when, trigger next frame
Shoot process.
Implement the system as described above for the location triggered control method of CT scan, the system comprises rotary shaft volumes
Code device, lifting shaft encoder, controller, detector and host computer, the controller and rotary/shaft encoder, lifting shaft encode
Device, detector, host computer are connected setting, and the detector is also connected with host computer setting；The rotary/shaft encoder
It is capable of the location information of real-time measurement sample stage rotary shaft and exports pulse to controller, the lifting shaft encoder can be real-time
It measures the location information of sample stage lifting shaft and exports pulse to controller, the controller can receive pulse and to detector
Trigger signal is issued, the detector is able to detect that trigger signal and shoots a frame and send host computer, the host computer to
All frames can be rebuild to synthesis 3-D image, restore sample interior structure；
The controller includes signal processing module, position comparison module, position latch module, the port I/O, triggering end
Mouth, latch port and trigger position module, input terminal and rotary/shaft encoder, the lifting shaft encoder of the signal processing module
Output end be connected setting, the input terminal of the output end and position comparison module of the signal processing module, position latch module
Be connected setting, the position comparison module, position latch module output end be connected with the port I/O setting, the trigger bit
Module is set also to be connected with position comparison module setting；
The triggering port includes by triggering port I and triggering port II, and the output end of the port I/O passes through triggering
Port I is connected setting with detector；The output end of the port I/O is also by triggering port II, latch port and the port I/O
Input terminal be connected setting；
Controller receives pulse, and after signal processing, rotary shaft pulse and a series of pre-set trigger positions are carried out
Compare, when pulse reaches a predetermined position, trigger signal is issued to detector by triggering port I；Meanwhile passing through triggering
Port II issues trigger signal to latch port；
Latch port detects trigger signal, latches current lifting shaft location information, and report to host computer.
The advantages of present invention obtains and good effect are:
1, location triggered control method of the present invention can directly carry out the control of trigger signal by controller, realize milli
The rapid location triggering of second rank, location information is accurate, improves the reconstruction quality of 3-D image, and simplify structure and letter
Number analytic process.
2, the method for the present invention realizes CT scan control with the mode based on location triggered.Preceding method can be overcome
Disadvantage directly acquires accurate rotation and elevation information, improves the reconstruction quality of 3-D image.
Detailed description of the invention
Fig. 1 is the basic schematic diagram of CT scan in the prior art；
Fig. 2 is a kind of structure connection diagram of system for implementing the method for the present invention；
Fig. 3 is a kind of flow chart of the method for the present invention；
Fig. 4 is the structure connection diagram of the system of second of implementation the method for the present invention；
Fig. 5 is another flow chart of the method for the present invention；
Fig. 6 is the structure connection diagram that the third implements the system of the method for the present invention.
Specific embodiment
Below with reference to the invention will be further described by specific embodiment, following embodiment be it is descriptive, no
It is restrictive, this does not limit the scope of protection of the present invention.
Raw material used in the present invention is unless otherwise specified conventional commercial product；Used in the present invention
Equipment is unless otherwise specified conventional commercial equipment.
In the prior art CT scan basic principle as shown in Figure 1, radiographic source, sample, detector in straight line
On, X-ray cone-beam penetrates sample and projects on detector, sample stage spiral lifting, shoots a series of projected images (frame), all frames
Synthesis 3-D image is rebuild, sample interior structure is restored.
A kind of location triggered control method for CT scan, steps are as follows:
The location information of encoder real-time measurement sample stage rotary shaft simultaneously exports pulse；Detector is taken pictures acquired projections figure
Picture；Host computer receives projected image；Controller mediate.
More preferably, the encoder includes but is not limited to the encoder for having various rotation or straight line, grating scale etc..
Implement the system as described above for the location triggered control method of CT scan, as shown in Fig. 2, the system packet
Including encoder, detector, host computer and controller, the controller and encoder, detector, host computer are connected setting,
The detector is also connected with host computer setting；The encoder is capable of the location information of real-time measurement sample stage rotary shaft simultaneously
Pulse is exported to controller, the controller can receive pulse and issue trigger signal to detector, and the detector can
It detects trigger signal and shoots a frame and send host computer to, all frames can be rebuild synthesis three-dimensional figure by the host computer
Picture restores sample interior structure.
More preferably, the above-mentioned location triggered control method for CT scan, as shown in figure 3, more specifically steps are as follows:
By the location information of rotary/shaft encoder real-time measurement rotary shaft, pulse is exported to controller；
Controller receives pulse, and is compared with a series of pre-set trigger positions, when the two is consistent, passes through
The port I/O issues trigger signal to detector；
Detector detects trigger signal, shoots a frame and sends host computer to；
So far a location triggered take pictures process completion, when pulse reach next scheduled position when, trigger next frame
Shoot process；
All frames can be rebuild synthesis 3-D image by host computer, restore sample interior structure.
More preferably, entirely triggering control flow is realized by High-Speed Hardware port, does not carry out position by upper computer software
Determine, so delay very little further improves reconstruction quality only in several milliseconds of ranks.
More preferably, for the shooting time of each frame, the spacing distance of trigger position and sample stage rotation speed speed,
Need to meet the frame number of CT scan needs and the performance indicator of detector, detector shoot a frame need certain time for exposure and
Data processing time.
Location triggered control method of the present invention directly carries out the control of trigger signal by controller, realizes a millisecond rank
Rapid location triggering, location information is accurate, improves the reconstruction quality of 3-D image；Evade what closed-loop control may cause
It is unstable；And simplify structure and signal analysis process.
Implement the system as described above for the location triggered control method of CT scan, as shown in figure 4, the system packet
Rotary/shaft encoder, controller, detector and host computer are included, the controller is connected with encoder, detector, host computer
Setting, the detector are also connected with host computer setting；The encoder is capable of the position of real-time measurement sample stage rotary shaft
Information simultaneously exports pulse to controller, and the controller can receive pulse and issue trigger signal, the detection to detector
Device is able to detect that trigger signal and shoots a frame and send host computer to, and all frames can be rebuild synthesis three by the host computer
Image is tieed up, sample interior structure is restored；
The controller includes signal processing module, position comparison module, the port I/O, triggering port and trigger position mould
Block, the input terminal of the signal processing module are connected setting with the output end of rotary/shaft encoder, the signal processing module
Output end is connected setting with the input terminal of position comparison module, and the output end of the position comparison module is connected with the port I/O
Setting, the port I/O are connected setting by triggering port with detector, the trigger position module also with position comparison module
Be connected setting.
More preferably, the above-mentioned location triggered control method for CT scan, as shown in figure 5, more specifically steps are as follows:
The location information of rotary/shaft encoder real-time measurement rotary shaft exports pulse；Meanwhile it going up and down shaft encoder and surveying in real time
The location information of lifting shaft is measured, pulse is exported；
Controller receives pulse, and after signal processing, rotary shaft pulse and a series of pre-set trigger positions are carried out
Compare, when pulse reaches a predetermined position, trigger signal is issued to detector by triggering port I；Meanwhile passing through triggering
Port II issues trigger signal to latch port；
Latch port detects trigger signal, latches current lifting shaft location information, and report to host computer；Meanwhile it visiting
It surveys device and detects trigger signal, shoot a frame and send host computer to.
So far a location triggered take pictures process completion, when pulse reach next scheduled position when, trigger next frame
Shoot process.
More preferably, entirely triggering control flow is realized by High-Speed Hardware port, does not carry out position by upper computer software
Determine, so delay very little further improves reconstruction quality only in several milliseconds of ranks.
More preferably, for the shooting time of each frame, the spacing distance of trigger position and sample stage rotation speed speed,
Need to meet the frame number of CT scan needs and the performance indicator of detector, detector shoot a frame need certain time for exposure and
Data processing time.
More preferably, position, which is compared the trigger signal of generation while being exported, latches end to the position inside detector and controller
Mouthful.
Implement the system as described above for the location triggered control method of CT scan, as shown in fig. 6, the system packet
Rotary/shaft encoder, lifting shaft encoder, controller, detector and host computer are included, the controller and rotary/shaft encoder rise
Drop shaft encoder, detector, host computer are connected setting, and the detector is also connected with host computer setting；The rotation
Shaft encoder is capable of the location information of real-time measurement sample stage rotary shaft and exports pulse, the lifting shaft encoder to controller
It is capable of the location information of real-time measurement sample stage lifting shaft and exports pulse to controller, the controller can receives pulse simultaneously
Trigger signal is issued to detector, the detector is able to detect that trigger signal and shoots a frame and send host computer to, institute
All frames can be rebuild synthesis 3-D image by stating host computer, restore sample interior structure；
The controller includes signal processing module, position comparison module, position latch module, the port I/O, triggering end
Mouth, latch port and trigger position module, input terminal and rotary/shaft encoder, the lifting shaft encoder of the signal processing module
Output end be connected setting, the input terminal of the output end and position comparison module of the signal processing module, position latch module
Be connected setting, the position comparison module, position latch module output end be connected with the port I/O setting, the trigger bit
Module is set also to be connected with position comparison module setting；
The triggering port includes by triggering port I and triggering port II, and the output end of the port I/O passes through triggering
Port I is connected setting with detector；The output end of the port I/O is also by triggering port II, latch port and the port I/O
Input terminal be connected setting；
Controller receives pulse, and after signal processing, rotary shaft pulse and a series of pre-set trigger positions are carried out
Compare, when pulse reaches a predetermined position, trigger signal is issued to detector by triggering port I；Meanwhile passing through triggering
Port II issues trigger signal to latch port；
Latch port detects trigger signal, latches current lifting shaft location information, and report to host computer.
Although disclosing the embodiment of the present invention for the purpose of illustration, it will be appreciated by those skilled in the art that: not
Be detached from the present invention and spirit and scope of the appended claims in, various substitutions, changes and modifications be all it is possible, therefore, this
The range of invention is not limited to the embodiment disclosure of that.
Claims (9)
1. a kind of location triggered control method for CT scan, it is characterised in that: steps are as follows:
The location information of encoder real-time measurement sample stage rotary shaft simultaneously exports pulse；Detector is taken pictures acquired projections image；On
Position machine receives projected image；Controller mediate.
2. the location triggered control method according to claim 1 for CT scan, it is characterised in that: the encoder is
The encoder or grating scale of rotation or straight line.
3. the location triggered control method according to claim 1 for CT scan, it is characterised in that: the method passes through
High-Speed Hardware port is realized, does not carry out location determination by upper computer software, so delay very little, only in several milliseconds of ranks.
4. the location triggered control method according to any one of claims 1 to 3 for CT scan, it is characterised in that: institute
Method is stated for the shooting time of each frame, the spacing distance of trigger position and sample stage rotation speed speed, needs to meet
The performance indicator of frame number and detector that CT scan needs, detector shoot a frame and need certain time for exposure and data processing
Time.
5. implementing the system such as the described in any item location triggered control methods for CT scan of Claims 1-4, feature
It is: the controller and encoder, detector, upper the system comprises encoder, detector, host computer and controller
Machine is connected setting, and the detector is also connected with host computer setting；The encoder being capable of the rotation of real-time measurement sample stage
The location information of shaft simultaneously exports pulse to controller, and the controller can receive pulse and issue triggering letter to detector
Number, the detector is able to detect that trigger signal and shoots a frame and send host computer to, and the host computer can will own
Frame rebuilds synthesis 3-D image, restores sample interior structure.
6. a kind of location triggered control method for CT scan, it is characterised in that: specific steps are as follows:
By the location information of rotary/shaft encoder real-time measurement rotary shaft, pulse is exported to controller；
Controller receives pulse, and is compared with a series of pre-set trigger positions, when the two is consistent, passes through I/O
Port issues trigger signal to detector；
Detector detects trigger signal, shoots a frame and sends host computer to；
So far a location triggered take pictures process completion, when pulse reach next scheduled position when, triggering next frame shooting
Process；
All frames can be rebuild synthesis 3-D image by host computer, restore sample interior structure.
7. implementing the system as claimed in claim 6 for the location triggered control method of CT scan, it is characterised in that: described
System includes rotary/shaft encoder, controller, detector and host computer, and the controller and encoder, detector, host computer are equal
Be connected setting, and the detector is also connected with host computer setting；The encoder being capable of real-time measurement sample stage rotary shaft
Location information and to controller export pulse, the controller can receive pulse and to detector issue trigger signal, institute
It states detector to be able to detect that trigger signal and shoot a frame and send host computer to, the host computer can rebuild all frames
3-D image is synthesized, sample interior structure is restored；
The controller includes signal processing module, position comparison module, the port I/O, triggering port and trigger position module, institute
The input terminal for stating signal processing module is connected setting with the output end of rotary/shaft encoder, the output end of the signal processing module
Be connected setting with the input terminal of position comparison module, and the output end of the position comparison module is connected setting with the port I/O, should
The port I/O is connected setting by triggering port with detector, and the trigger position module is also connected with position comparison module
Setting.
8. a kind of location triggered control method for CT scan, it is characterised in that: specific steps are as follows:
The location information of rotary/shaft encoder real-time measurement rotary shaft exports pulse；Meanwhile going up and down shaft encoder real-time measurement liter
The location information of axis is dropped, pulse is exported；
Controller receives pulse, and after signal processing, rotary shaft pulse is compared with a series of pre-set trigger positions,
When pulse reaches a predetermined position, trigger signal is issued to detector by triggering port I；Meanwhile by triggering port
II issues trigger signal to latch port；
Latch port detects trigger signal, latches current lifting shaft location information, and report to host computer；Meanwhile detector
It detects trigger signal, shoot a frame and sends host computer to.
So far a location triggered take pictures process completion, when pulse reach next scheduled position when, triggering next frame shooting
Process.
9. implementing the system as claimed in claim 8 for the location triggered control method of CT scan, it is characterised in that: described
System includes rotary/shaft encoder, lifting shaft encoder, controller, detector and host computer, and the controller and rotary shaft are compiled
Code device, lifting shaft encoder, detector, host computer are connected setting, and the detector is also connected with host computer setting；Institute
Rotary/shaft encoder is stated to be capable of the location information of real-time measurement sample stage rotary shaft and export pulse, the lifting shaft to controller
Encoder is capable of the location information of real-time measurement sample stage lifting shaft and exports pulse to controller, and the controller can receive
Pulse simultaneously issues trigger signal to detector, and the detector is able to detect that trigger signal and shoots a frame and send to upper
All frames can be rebuild synthesis 3-D image, restore sample interior structure by machine, the host computer；
The controller includes signal processing module, position comparison module, position latch module, the port I/O, triggering port, lock
Deposit port and trigger position module, the input terminal of the signal processing module and rotary/shaft encoder, lifting shaft encoder it is defeated
Outlet is connected setting, and the output end of the signal processing module is connected with the input terminal of position comparison module, position latch module
Connect setting, the position comparison module, position latch module output end be connected with the port I/O setting, the trigger position mould
Block is also connected with position comparison module setting；
The triggering port includes by triggering port I and triggering port II, and the output end of the port I/O passes through triggering port
I is connected setting with detector；The output end of the port I/O is defeated also by triggering port II, latch port and the port I/O
Enter end to be connected setting；
Controller receives pulse, and after signal processing, rotary shaft pulse is compared with a series of pre-set trigger positions,
When pulse reaches a predetermined position, trigger signal is issued to detector by triggering port I；Meanwhile by triggering port
II issues trigger signal to latch port；
Latch port detects trigger signal, latches current lifting shaft location information, and report to host computer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117562564A (en) * | 2024-01-15 | 2024-02-20 | 赛诺威盛科技(北京)股份有限公司 | Gantry rotation angle control device and control method of CT scanning system |
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