CN107633190A - A kind of CT frames rotating part encodes reading code method - Google Patents
A kind of CT frames rotating part encodes reading code method Download PDFInfo
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- CN107633190A CN107633190A CN201711039825.4A CN201711039825A CN107633190A CN 107633190 A CN107633190 A CN 107633190A CN 201711039825 A CN201711039825 A CN 201711039825A CN 107633190 A CN107633190 A CN 107633190A
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Abstract
The present invention relates to a kind of CT frames rotating part to encode reading code method, by two signal paths for reading first sensor and second sensor, and take "or" value for the phase difference between two signals, ensure when dust blocks perforate corresponding to a sensor, perforate still can be read and be processed corresponding to another sensor, and then judge position and the speed of frame rotation.The present invention can improve tolerances of the CT to environment, automatically remove the influence to machine when notch is blocked, do not increase Material Cost, to handle the robustness of the method for encoded signal increase system, even if generation encoder perforate is blocked, also correct signal can be produced so that CT use is unaffected.
Description
Technical field
The invention belongs to data identification；Data represent；Record carrier；The technical field of the processing of carrier is recorded, is especially related to
A kind of and CT frames rotating part coding reading code method.
Background technology
Medical image is that research is interacted by means of certain medium (such as X ray, electromagnetic field, ultrasonic wave) and human body,
Inside of human body histoorgan structure, density are showed with imaging modality, the information provided for diagnostician according to image is entered
Row judges, so as to a kind of medical science supplementary mode evaluated human health status, including medical image system and medical science figure
As the aspect of processing two.Medical image mainly include X-ray Image-forming instrument, CT instruments, positron scanner (PET), nuclear magnetic resonance into
As instrument etc..
During medical image is imaged, the position of CT frames rotation and speed are come in fact usually using photoelectric coding ring
Existing, hospital uses CT environment, although very clean compared with other industry spots, unavoidably due to human hair, clothing
Fiber etc. blocks encoder hole, causes CT failures.
In the use environment of reality, situation the methods of can not rely on manual cleaning that dust enters CT frames, comes in advance in advance
It is anti-, enter frame once dust occurs, plug any one perforate of photoelectric coding ring, will result in a coding collar reading code
Pulse missing, cause corresponding angular error, so as to cause CT positioning picture to deflect, tomoscan image weight
Build and artifact occur, influence judgement of the doctor for CT images and the treatment for sufferer.
In the prior art, it is general using filter materials such as installation air filter screens in the case of notch is blocked, prevent dust from entering
Enter frame, even if however, be mounted with air filter screen in frame, can not prevent dust from entering from outer cover gap, or dust exists
Produced on inter deterioration device, and during the filter materials such as installation air filter screen, Material Cost is added, also by the mistake of installation
Journey complicates.
The content of the invention
Present invention solves the technical problem that be, it is in the prior art, general empty using installation in the case of notch is blocked
The filter materials such as air filter net, prevent dust from entering frame, though caused by be mounted with air filter screen in frame, dust can not be prevented
Enter from outer cover gap, or dust internally wears on device and produced, and during the filter materials such as installation air filter screen, increase
Add Material Cost, the problem of also the process of installation is complicated, and then provide a kind of CT frames rotating part coding of optimization
Reading code method.
The technical solution adopted in the present invention is that a kind of CT frames rotating part encodes reading code method, the CT frames rotation
Portion is provided with photoelectric encoder, and the photoelectric encoder is connected with 0 level sensor, first sensor and second sensor；It is described
Reading code method comprises the following steps：
Step 1：On the basis of 0 level sensor, signal A and second caused by the signalling channel of first sensor is read respectively
Signal B caused by the signalling channel of sensor；
Step 2：Judge the phase difference between signal A and signal B；When phase difference is more than 0 degree, step 3 is carried out, works as phase difference
During equal to 0, step 4 is carried out；
Step 3：The time for obtaining signal A and obtaining signal B is read, calculates time difference t, produces reading code signal triggerC
=(A+t) | | B, output, terminate reading code；
Step 4：Produce reading code signal triggerC=A | | B, output, terminate reading code.
Preferably, in the step 3, time difference t=L/w, wherein, L is corresponding to first sensor and second sensor
The phrase overlap distance of perforate, w are the rotary speed of CT frames.
Preferably, in the step 3, when the phase difference is 90 °,Wherein, l is first sensor and second
The half of sensor aperture length, w are the rotary speed of CT frames.
Preferably, in the step 4, first sensor and second sensor are calibrated, obtain signal A and signal B
Between phase compensation value Toffset, obtain time bias value toffset=Toffset/ w, produce reading code signal triggerC=(A+
toffset) | | B, output, terminate reading code.
The invention provides a kind of CT frames rotating part of optimization to encode reading code method, by reading first sensor and the
Two signal paths of two sensors, and "or" value is taken for the phase difference between two signals, ensure to block one even in dust
Corresponding to individual sensor during perforate, perforate still can be read and be processed corresponding to another sensor, and then judge machine
The position of frame rotation and speed.The present invention can improve tolerances of the CT to environment, automatically remove notch be blocked when pair
The influence of machine, does not increase Material Cost, to handle the robustness of the method for encoded signal increase system, even if encoder occurs
Perforate is blocked, and can also produce correct signal so that CT use is unaffected.
Brief description of the drawings
Fig. 1 is encoded signal schematic diagram when phase difference is more than 0 degree in the present invention；
Fig. 2 is encoded signal schematic diagram when phase difference is equal to 0 degree in the present invention；
Wherein, the t that A and B is respectively in signal A and signal B, Fig. 1 is the time difference.
Embodiment
The present invention is described in further detail with reference to embodiment, but protection scope of the present invention is not limited to
This.
As illustrated, the present invention relates to a kind of CT frames rotating part to encode reading code method, set on the CT frames rotating part
There is photoelectric encoder, the photoelectric encoder is connected with 0 level sensor, first sensor and second sensor；The reading code side
Method comprises the following steps.
Step 1：On the basis of 0 level sensor, signal A and second caused by the signalling channel of first sensor is read respectively
Signal B caused by the signalling channel of sensor.
In the present invention, the premise of use is general encoder reading code plate, in addition to 0 level sensor, is also passed with first
Sensor and second sensor, first sensor and second sensor produce signalling channel respectively, be generally used for produce 4 times frequency dividing and
Judge the encoding strip direction of motion.
In the present invention, in CT application process is related to, it is not usually required to using 4 times of frequency dividings, the direction of rotation of CT frames
It is and single, it is not necessary to judge to turn to, therefore, in the application process of reality, first sensor and second sensor produce
Two phase signals only used any one phase, another phase signals are typically ignored.
Step 2：Judge the phase difference between signal A and signal B；When phase difference is more than 0 degree, step 3 is carried out, works as phase difference
During equal to 0, step 4 is carried out.
In the present invention, first sensor produces signal A, and second sensor produces signal B, there may be between signal A and B
Phase difference, it is also possible to overlapping.
Step 3：The time for obtaining signal A and obtaining signal B is read, calculates time difference t, produces reading code signal triggerC
=(A+t) | | B, output, terminate reading code.
In the step 3, time difference t=L/w, wherein, L is the phase of perforate corresponding to first sensor and second sensor
Position overlap distance, w are the rotary speed of CT frames.
In the step 3, when the phase difference is 90 °,Wherein, l is that first sensor and second sensor are opened
The half of hole length, w are the rotary speed of CT frames.
In the present invention, when phase difference is more than 0 degree, the time for obtaining signal A and obtaining signal B is read, calculates the time difference
T, time difference t is to obtain signal A time and signalling channel from second sensor from the signalling channel of first sensor herein
The difference of acquisition signal B time, therefore reading code signal triggerC=(A+t) | | B, i.e. reading code signal are that a-signal is delayed after t, with B
Signal does OR operation, i.e. (A+t) signal or B signal, any one signal is effective, can produce reading code signal, even if grey
During any corresponding perforate of dirt blocking first sensor or second sensor, perforate corresponding to another sensor still can quilt
Read, correct reading code signal remains able to produce.
In the present invention, the phrase overlap distance that time difference t is equal to perforate corresponding to first sensor and second sensor is removed
With CT gantry rotation rates, i.e. t=L/w, CT gantry rotation rates herein can be obtained by digital logic device automatic measurement
Arrive, method for automatic measurement is universal method, and those skilled in the art can voluntarily measure.
In the present invention, during the use of reality, the first sensor and second sensor in photoelectric sensor are corresponding
The phase difference of perforate be typically both configured to 90 °, now, time difference t be equal to the half of perforate length again divided by CT frames rotation
Rotary speed, i.e.,
In the present invention, when phase difference is more than 0 degree, step 3 can use the general encoding board of those skilled in the art to realize
Reading code, and then judge position and the speed of frame rotation.
Step 4：Produce reading code signal triggerC=A | | B, output, terminate reading code.
In the step 4, first sensor and second sensor are calibrated, obtain the phase between signal A and signal B
Offset Toffset, obtain time bias value toffset=Toffset/ w, produce reading code signal triggerC=(A+toffset) | | B,
Output, terminate reading code.
In the present invention, there is an error dot, because CT frames there may be speed error, this error in the method for step 3
Time difference t error can be caused, in turn results in the error of reading code signal, the degree of accuracy of CT shelf positions can be caused to decline.
In the present invention, it is further proposed that phase difference is equal to 0 degree of situation, that is, first sensor and second sensor phase are moved
For the position of CT frames so that the phase difference of perforate corresponding to first sensor and second sensor is 0 degree, now first is passed
Sensor is identical with impulse phase caused by second sensor, avoids due to being done caused by the error of CT gantry rotation rates
Disturb.
In the present invention, when phase difference is equal to 0 degree, reading code signal triggerC=A is produced | | B, you can to utilize simultaneously
Signal A and B caused by first sensor and second sensor carry out OR operation, and any one signal is effective, can produce reading
Code signal, even if during any corresponding perforate of dust blocking first sensor or second sensor, another sensor is corresponding
Perforate still can be read, correct reading code signal remains able to produce.
In the present invention, when phase difference is equal to 0 degree, solve the problems, such as CT frame rotation errors, this step is based on whole piece
The mechanical dimension of the perforate of coding-belt is uniform, and foozle is in allowed band.
In the present invention, when position of opening has machine error, caused pulse signal can be caused shake to be present, therefore need
Calibrated.
In the present invention, for a coding-belt, the machine error of all aperture positions is all fixed, therefore obtains letter
Phase compensation value T number between A and signal Boffset, when producing encoded signal, with phase compensation value ToffsetDivided by frame rotating speed,
Obtain time bias value toffset=Toffset/ w, calibration is completed, signal A is now returned to and signal B has phase difference,
Produce reading code signal triggerC=(A+toffset) | | B, output.
In the present invention, phase compensation value ToffsetAutomatic measurement, record and reading can be come using digital logic device, this
For skilled addressee readily understands that content.
In the present invention, all calculating and data handling procedure, any Digital processing device can be used to realize, such as
MCU, FPGA, DSP or CPU, CPLD etc., can be according to understanding Self-operating of the those skilled in the art for technology.
The present invention solves in the prior art, general using filters such as installation air filter screens in the case of notch is blocked
Material, prevent dust from entering frame, though caused by be mounted with air filter screen in frame, dust can not be prevented from outer cover gap
Into, or dust internally wears on device and produces, and during the filter materials such as installation air filter screen, add material into
This, the problem of also the process of installation is complicated, by reading two signal paths of first sensor and second sensor, and
"or" value is taken for the phase difference between two signals, is ensured when dust blocks perforate corresponding to a sensor, it is another
Perforate still can be read and be processed corresponding to individual sensor, and then judge position and the speed of frame rotation.The present invention
Tolerances of the CT to environment can be improved, the influence to machine when notch is blocked is automatically removed, does not increase Material Cost,
To handle the robustness of the method for encoded signal increase system, it is blocked even if encoder perforate occurs, can also produces correct letter
Number so that CT use is unaffected.
Claims (4)
1. a kind of CT frames rotating part encodes reading code method, the CT frames rotating part is provided with photoelectric encoder, the photoelectricity
Encoder is connected with 0 level sensor, first sensor and second sensor；It is characterized in that：The reading code method includes following
Step：
Step 1：On the basis of 0 level sensor, the sensings of signal A and second caused by the signalling channel of first sensor are read respectively
Signal B caused by the signalling channel of device；
Step 2：Judge the phase difference between signal A and signal B；When phase difference is more than 0 degree, step 3 is carried out, when phase difference is equal to
When 0, step 4 is carried out；
Step 3：The time for obtaining signal A and obtaining signal B is read, calculates time difference t, produces reading code signal triggerC=(A
+ t) | | B, output, terminate reading code；
Step 4：Produce reading code signal triggerC=A | | B, output, terminate reading code.
A kind of 2. CT frames rotating part coding reading code method according to claim 1, it is characterised in that：In the step 3,
Time difference t=L/w, wherein, L is the phrase overlap distance of perforate corresponding to first sensor and second sensor, and w is CT frames
Rotary speed.
A kind of 3. CT frames rotating part coding reading code method according to claim 2, it is characterised in that：In the step 3,
When the phase difference is 90 °,Wherein, l is the half of first sensor and second sensor perforate length, w CT
The rotary speed of frame.
A kind of 4. CT frames rotating part coding reading code method according to claim 1, it is characterised in that：In the step 4,
First sensor and second sensor are calibrated, obtain the phase compensation value T between signal A and signal Boffset, obtain the time
Offset toffset=Toffset/ w, produce reading code signal triggerC=(A+toffset) | | B, output, terminate reading code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711039825.4A CN107633190B (en) | 2017-10-28 | 2017-10-28 | Code reading method for rotary part code of CT (computed tomography) machine frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711039825.4A CN107633190B (en) | 2017-10-28 | 2017-10-28 | Code reading method for rotary part code of CT (computed tomography) machine frame |
Publications (2)
| Publication Number | Publication Date |
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| CN107633190A true CN107633190A (en) | 2018-01-26 |
| CN107633190B CN107633190B (en) | 2020-06-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112617869A (en) * | 2020-11-24 | 2021-04-09 | 明峰医疗系统股份有限公司 | Method and system for positioning communication breakpoint of CT slip ring |
| CN113686369A (en) * | 2021-08-27 | 2021-11-23 | 明峰医疗系统股份有限公司 | Identification and positioning system for coding ring hole site blockage of CT frame encoder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290999A (en) * | 1999-09-30 | 2001-04-11 | 株式会社东芝 | Non-linear compensator |
| CN101382443A (en) * | 2007-09-06 | 2009-03-11 | 夏普株式会社 | Photoelectric encoder and electronic equipment using the same |
| JP2017125866A (en) * | 2017-04-27 | 2017-07-20 | パナソニックＩｐマネジメント株式会社 | Optical encoder |
-
2017
- 2017-10-28 CN CN201711039825.4A patent/CN107633190B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290999A (en) * | 1999-09-30 | 2001-04-11 | 株式会社东芝 | Non-linear compensator |
| CN1183661C (en) * | 1999-09-30 | 2005-01-05 | 株式会社东芝 | Non-linear compensator |
| CN101382443A (en) * | 2007-09-06 | 2009-03-11 | 夏普株式会社 | Photoelectric encoder and electronic equipment using the same |
| JP2017125866A (en) * | 2017-04-27 | 2017-07-20 | パナソニックＩｐマネジメント株式会社 | Optical encoder |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112617869A (en) * | 2020-11-24 | 2021-04-09 | 明峰医疗系统股份有限公司 | Method and system for positioning communication breakpoint of CT slip ring |
| CN113686369A (en) * | 2021-08-27 | 2021-11-23 | 明峰医疗系统股份有限公司 | Identification and positioning system for coding ring hole site blockage of CT frame encoder |
| CN113686369B (en) * | 2021-08-27 | 2022-12-20 | 明峰医疗系统股份有限公司 | Identification and positioning system for coding ring hole site blockage of CT frame encoder |
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| CN107633190B (en) | 2020-06-05 |
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