CN107049347A - The calibration method of X-ray production apparatus tube current - Google Patents
The calibration method of X-ray production apparatus tube current Download PDFInfo
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- A—HUMAN NECESSITIES
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Abstract
The calibration method of X-ray production apparatus tube current, comprises the following steps：It is N sections by the initial characteristic curve segmentation of a tube current heater current, the two-end-point of every section of curve is connected with straight line, the equation of every section of straight line is calculated：Yn=knX+b, wherein, knThe slope of n-th section of straight line is represented, n=1 ..., N, b are constant, and x is tube current value, YnFor the magnitude of voltage of heater current；The tube current value of every section of straight line two-end-point of collection and its magnitude of voltage of corresponding heater current, the data collected and the data of initial characteristic curve are contrasted, if error is less than error threshold, then the equation of this section of straight line is constant, if error is more than error threshold, the equation of this section of straight line is updated using the data collected；Initial characteristic curve is calibrated using linear equation, corresponding linear equation is chosen according to the tube current value to be used, the magnitude of voltage of corresponding heater current is calculated using linear equation.The inventive method can be calibrated to bulb tube current, realize the accurate output of tube current.
Description
Technical field
The invention belongs to technical field of medical equipment, more particularly to a kind of calibration method of X-ray production apparatus tube current.
Background technology
Medical diagnostic X-ray apparatus be it is a kind of carry out the medical imaging device of medical diagnosis by producing X-ray, main application
In operation PCI and medical image diagnosis field.It is mainly when X-ray is used for medical diagnosis and penetrates work according to X-ray
With, differential absorption, photosensitization and fluorescence.When passing through human body due to X-ray, by different degrees of absorption, such as bone
The amount of x-ray of absorption is more than the amount that muscle absorbs, then by the amount of x-ray after human body with regard to different, such Portable belt
The power of the information of partes corporis humani's Density Distribution, fluorescence caused by fluorescent screen or on photographic film or photosensitization is just
There is bigger difference, thus the shade that would indicate that different densities (by development, is fixed) on fluorescent screen or on photographic film.Root
According to the deep or light contrast of shade, with reference to clinical manifestation, result of laboratory test and pathological diagnosis, you can whether just to judge a human body part
Often.
X-ray production apparatus mainly by control the tube voltage (kV), tube current (mA) and duration (mS) of X-ray bulb come
The output accumulation of X-ray is controlled, so as to control the image quality of imaged image.Wherein, the control signal of tube voltage is kV ranks,
Signal sampling and control can be realized easily and accurately；Duration passes through embedded control chip control, the instruction week of chip
Phase and time precision are generally nanosecond (uS) level, the required precision of millisecond time when can also be easier to meet exposure.Tube current is
The electric current that the electronics that filament heating is produced is formed under negative and positive two-stage high voltage field action during hypervelocity motion on the sunny side, current X is penetrated
Line machine directly can't control tube current, it is necessary to set tube current indirectly by controlling the size of heater current.For pipe electricity
For the control of stream, because its real output value is small, while the loss of signal and compensation in the controlled loop of meeting in each device
Influence, it is difficult to the output accuracy of accurate control tube current.And the calibration of tube current and its output control directly affect X ray image
The image quality of equipment, has a direct impact to doctor's clinical diagnosis, therefore, and tube current output accuracy is to judge that image documentation equipment is good and bad
One of whether key technical index.
Because the control of X bulb tube currents is not that can all provide tube current on Linear Control, the shop instructions of X-ray production apparatus
With the characteristic curve relation of heater current, in order to which user uses.But the heater current of equipment is tested with producer during actual use
As a result have differences, and with the increase filament meeting aging of use time, different work bad borders and temperature can all cause pipe electricity
The characteristic curve flowed with heater current is changed, it is therefore necessary to bulb tube current is calibrated, bulb could be accurately controlled
The tube current of reality output.
Publication No. CN105430858A Chinese invention patent application discloses a kind of filament current value school of X-ray tube
Quasi- method, this method is exposed to conventional tube current value and tube voltage value with corresponding filament current value, other pipe electricity
Flow valuve, tube voltage value and filament current value remove calibration from, so as to reduce the number of times that X-ray tube is exposed, do not waste X-ray
Tube lifetime, and by by the absolute value of actual tube current value and the difference of tube current value to be calibrated respectively with the first preset difference value
It is compared with the second preset difference value, if absolute value is less than or equal to the first preset value, judges that default corresponding relation meets
It is required that, filament current value is preset as the standard filament current value after calibration, so that calibration process has been simplified, when shortening calibration
Between, improve calibration efficiency.This method is that conventional value is calibrated, although improves efficiency, but calibrates not comprehensive.
Publication No. CN104470175A Chinese invention patent application discloses a kind of cathode filament of X-ray emitter
The calibration method of emssion characteristic curve, in the practical work process of X-ray emitter, based on the first cathode filament emission characteristics
Curve sets heater current and the generation X-ray that works, while the corresponding actual tube current of the heater current is gathered, filament electricity
Stream and actual tube current are used to dynamic calibration the first cathode filament emssion characteristic curve and obtain the second cathode modulation to update
Silk emssion characteristic curve.This method is to use least square fitting filament emssion characteristic curve, the cathode filament hair after calibration
Penetrate characteristic curve more accurate, but this method step is complex, it is computationally intensive.
The content of the invention
It is an object of the invention to provide a kind of calibration method of X-ray production apparatus tube current, for solving medical X ray machine bulb
Bulb tube current is controlled when calibration and exposure, the problem of current parameters are inaccurate is solved.
To achieve these goals, the present invention takes following technical solution：
The calibration method of X-ray production apparatus tube current, comprises the following steps：
It it is N sections by the initial characteristic curve segmentation of a tube current-heater current, by the two-end-point straight line of every section of curve
Connection, calculates the equation of every section of straight line：Yn=knX+b, wherein, knThe slope of n-th section of straight line is represented, n=1 ..., N, b are
Constant, x is tube current value, YnFor the magnitude of voltage of heater current；
The tube current value of every section of straight line two-end-point of collection and its magnitude of voltage of corresponding heater current, by the data collected
Contrasted with the data of initial characteristic curve, if error is less than error threshold, the equation of this section of straight line is constant, if by mistake
Difference is more than error threshold, then the equation of this section of straight line is updated using the data collected；
Initial characteristic curve is calibrated using linear equation, corresponding straight line is chosen according to the tube current value to be used
Equation, the magnitude of voltage of corresponding heater current is calculated using linear equation.
More specifically, the initial characteristic curve of tube current-heater current of each voltage class is divided into N sections, according to
The initial characteristic curve of secondary tube current-heater current to each voltage class is calibrated.
More specifically, by the initial spy of tube current-heater current during the initial characteristic curve of segmentation tube current-heater current
Linearity curve is averagely divided into N sections.
More specifically, the error threshold is 10%.
More specifically, N value is 15<N<20.
From above technical scheme, the present invention is regarded a curve by a plurality of straight line as using the theory of the differential calculus
The method of composition calibrates tube current, is improving the same of the key performance of bulb tube current output accuracy and X ray image product
When, exposure frequency is reduced, to extend the service life of X-ray bulb, prover time is reduced, improves equipment service efficiency.
Brief description of the drawings
Fig. 1 is the block diagram of X-ray production apparatus control system；
Fig. 2 is the flow chart of the inventive method；
Fig. 3 is the performance diagram of X-ray production apparatus tube current-heater current.
The embodiment of the present invention is described in more detail below in conjunction with accompanying drawing.
Embodiment
Reference picture 1, Fig. 1 show the structured flowchart of X-ray production apparatus control system, and the control system of X-ray production apparatus mainly includes
A/D acquisition modules, D/A control modules, micro control system, touch screen module, communication module, exposure control module and storage mould
Block.Wherein, A/D acquisition modules are used for the voltage signal for gathering heater current, and AD sampling modules are LF353 integrated transporting discharging filtered electricals
Road, is the direct proportion computational calculation power diminution circuit that multiplication factor is less than 1, the magnitude of voltage of input signal can be reduced after gathering signal
In to suitable scope (0~3.3V), prevent the magnitude of voltage of the heater current collected from exceeding the input safety electricity of microcontroller
Press (3.3V).D/A control modules are LF353 integrated transporting discharging filter circuits, are that direct proportion computational calculation power of the multiplication factor more than 1 is put
Big circuit, can with the magnitude of voltage of rising output signal to suitable scope, its multiplication factor and A/D acquisition modules reduce again
Number is consistent, i.e., A/D acquisition modules are 2.5 to the minification of signal, then the multiplication factor of D/A control modules is exactly 2.5.Micro-control
System processed is converted and stored to the voltage signal collected in real time, current actual tube current value and heater current
Value is stored in memory module.Touch screen module has display function, while for setting and display tube current parameters in real time.It is logical
Believe the communication that module is used between touch-screen and control system.Exposure control module is used for adapter hand, backpedalling brake signal, notifies micro- place
Manage the triggering of device exposure signal.
In order to just with description, the characteristic curve of default tube current-heater current is defined as when X-ray production apparatus producer is dispatched from the factory
Initial characteristic curve, Fig. 3 show the performance diagram of tube current-heater current of X-ray production apparatus, tube current-lamp of X-ray production apparatus
The characteristic curve of silk electric current includes the characteristic curves of a plurality of different voltage class, such as 40KV, 50KV, 60KV, 70KV, 80KV,
100KV, 120KV characteristic curve.
The present invention is to the principle of the calibration method of X-ray production apparatus tube current：To every KV of bulb tube current-heater current
During the initial characteristic calibration curve of section, being N sections by every a KV sections of initial characteristic curve segmentation first, (N is whole more than zero
Number), the two-end-point for splitting every section of obtained curve is connected with straight line, i.e., regarded initial characteristic curve by N sections of rectilinear(-al)s as,
Every section of straight line equation Yn=knX+b represents, wherein, knThe slope of n-th section of straight line is represented, n=1 ..., N, b are constant, and x is
Tube current value, YnFor the magnitude of voltage of heater current；The tube current value of every section of straight line end points of collection and the electricity of corresponding heater current
Pressure value, by the magnitude of voltage of the tube current value collected and heater current tube current value corresponding with initial characteristic curve and filament electricity
Whether the magnitude of voltage of stream is compared, judge the error of data of the data and initial characteristic curve collected in error threshold Q
In the range of, the error threshold Q of the present embodiment is 10%, if the data collected and the data phase of initial characteristic curve
It is more than 10% than, error, then the linear equation of this section of straight line is entered using collecting the electric current of every section of straight line end points, voltage data
Row updates, if the error of the data collected and the data of initial characteristic curve is less than 10%, the straight line side of this section of straight line
Journey is constant, and initial characteristic curve is calibrated using the linear equation of multistage straight line, during using X-ray production apparatus, according to using
Tube current value choose corresponding linear equation, the magnitude of voltage of corresponding heater current is calculated using linear equation.
With reference to Fig. 2, the method for the present invention is described in detail with a specific embodiment, using the inventive method
The step of being calibrated to the tube current of X-ray production apparatus is as follows：
40KV, 50KV, 60KV, 70KV, 80KV, 100KV, 120KV initial characteristic curve are split respectively, will be every
Bar initial characteristic curve is averagely divided into some sections respectively, and calculates the linear equation Y of every section of straight line respectivelyn=knx+b；With
Exemplified by 40KV sections of initial characteristic curve, control X-ray production apparatus enters calibration mode, sets initial by 40KV sections by touch-screen
Characteristic curve is divided into 19 sections, i.e. N=19, then 40KV sections of initial characteristic curve can regard straight by the 1st article of 20mA to 29mA as
Line, 29mA to 38mA the 2nd article of straight line, 38mA to 48mA the 3rd article of straight line, 48mA to 57mA the 4th article of straight line, 57mA extremely
67mA the 5th article of straight line, 67mA to 76mA the 6th article of straight line, 76mA to 85mA the 7th article of straight line, the 8th article of 85mA to 95mA
Straight line, 95mA to 104mA the 9th article of straight line, 104mA to 114mA the 10th article of straight line, 114mA to 123mA Sub_clause 11 it is straight
Line, 123mA to 132mA the 12nd article of straight line, 132mA to 142mA the 13rd article of straight line, the 14th article of 142mA to 151mA it is straight
Line, 151mA to 161mA the 15th article of straight line, 161mA to 170mA the 16th article of straight line, 170mA to 179mA 17 articles of straight lines,
179mA to 189mA 18 articles of straight lines and the 19th article of 189mA to 200mA rectilinear(-al), i.e. 40KV sections of initial characteristic curve by
19 Yn=knX+b rectilinear(-al)；By that analogy, equally remaining KV sections of initial characteristic curve is split；The present invention's
Error threshold Q and curve segmentation quantity N are empirical value, and curve segmentation quantity N value will according to the trueness error of tube current
(error threshold Q) is asked to set, Q is not more than ± 10% for the trueness error of 10%, i.e. tube current in such as the present embodiment, then N takes
It is worth for 15<N<20；Initial characteristic curve is averagely divided into N sections during segmentation initial characteristic curve；
The positive plate of microprocessor control rotation, inversion plate, filament sheet normal work are triggered by backpedalling brake receiving module, make generator
Normal exposure, successively the magnitude of voltage of the tube current to every section of straight line two-end-point and corresponding heater current be acquired, i.e., to pipe
Current value be 20,29,38,48,57,67,76,85,95,104,114,123,132,142,151,161,170,179,189,
The magnitude of voltage of this corresponding heater current of 20 points of 200 (mA) is acquired；When tube current value is 20mA as shown in Figure 3, filament
The magnitude of voltage of electric current is more than 3.0V, in order that generator exposure reaches that first tube current point 20mA advances into steady operation shape
State, 2V is set to during collection by the magnitude of voltage of initial heater current；
The tube current of one section of straight line end points and the magnitude of voltage of corresponding heater current are often collected, just by the pipe collected electricity
The tube current and the electricity of heater current of the magnitude of voltage of stream and corresponding heater current and the initial characteristic curve of this section of line correspondences
Pressure value is compared, if the numerical value and the error of raw value that collect are more than 10%, utilizes the straight line end points collected
Tube current and the magnitude of voltage of heater current the linear equation of this section of straight line is updated and stored, if the numerical value collected
It is less than 10% with the error of raw value, then retains former linear equation, initial characteristic curve is calibrated by linear equation；
For example, 20mA to 29mA the 1st article of straight line on initial characteristic curve tube current be 20mA when corresponding heater current voltage
It is worth for a, the magnitude of voltage of heater current is b, corresponding lamp when the tube current that actual acquisition is obtained is 20mA when tube current is 29mA
The magnitude of voltage of silk electric current is a ', and the magnitude of voltage of heater current is b ' when tube current is 29mA, by a and a ', b and b ' be compared,
If error is less than 10%, retain the linear equation of the 1st article of straight line, if error is more than 10%, a is replaced with a ', b ' is replaced
B is changed, the linear equation of the 1st article of straight line is recalculated, linear equation is updated；
After the completion of the collection calibration of one KV sections of initial characteristic curves, backpedalling brake is unclamped, is set by touch-screen under
The initial characteristic curve of one KV sections of tube current-heater current is calibrated, and the process of calibration is ibid；
After the completion of the initial characteristic curve of all KV sections tube current-heater currents is all calibrated, calibration mode is exited；When entering
When entering mode of operation, the tube current value needed according to equipment, such as when needing 80mA tube current, 80mA's is located at the 7th article
On straight line, the linear equation Y of this section of straight line is extracted7=k7X+b, calculates the magnitude of voltage of corresponding heater current, obtains pipe electricity
The filament current value of setting is flowed, so as to ensure the accuracy of tube current output.
The present invention is based on tube current-heater current initial characteristic curve, by being some sections by initial characteristic curve segmentation
Straight line, initial characteristic curve is regarded as by some sections of small rectilinear(-al)s, passes through tube current-heater current to every section of straight line end points
Magnitude of voltage be acquired, obtain the equation of every section of straight line, initial characteristic curve calibrated using linear equation, not only carried
The high output accuracy of tube current, and sampling calibration number of times will not be significantly increased, maintained while output accuracy is improved
Efficiency.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although with reference to above-described embodiment pair
The present invention is described in detail, it should be understood by a person of ordinary skill in the art that still can be to the specific of the present invention
Embodiment is modified or equivalent substitution, and any modification or equivalent substitution without departing from spirit and scope of the invention,
It all should cover among scope of the presently claimed invention.
Claims (5)
- The calibration method of 1.X X-ray machine X tube currents, it is characterised in that comprise the following steps：It is N sections by the initial characteristic curve segmentation of a tube current-heater current, the two-end-point of every section of curve is connected with straight line Connect, calculate the equation of every section of straight line：Yn=knX+b, wherein, knThe slope of n-th section of straight line is represented, n=1 ..., N, b are normal Number, x is tube current value, YnFor the magnitude of voltage of heater current；The tube current value of every section of straight line two-end-point of collection and its magnitude of voltage of corresponding heater current, by the data collected and just The characteristic data that begin are contrasted, if error is less than error threshold, the equation of this section of straight line is constant, if error is big In error threshold, then the equation of this section of straight line is updated using the data collected；Initial characteristic curve is calibrated using linear equation, corresponding straight line side is chosen according to the tube current value to be used Journey, the magnitude of voltage of corresponding heater current is calculated using linear equation.
- 2. the calibration method of X-ray production apparatus tube current according to claim 1, it is characterised in that：By each voltage class The initial characteristic curve of tube current-heater current is all divided into N sections, successively to tube current-heater current of each voltage class Initial characteristic curve calibrated.
- 3. the calibration method of X-ray production apparatus tube current according to claim 1 or 2, it is characterised in that：Split tube current-lamp The initial characteristic curve of tube current-heater current is averagely divided into N sections during the initial characteristic curve of silk electric current.
- 4. the calibration method of X-ray production apparatus tube current according to claim 1 or 2, it is characterised in that：The error threshold is 10%.
- 5. the calibration method of X-ray production apparatus tube current according to claim 4, it is characterised in that：N value is 15<N<20.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110192888A (en) * | 2019-07-04 | 2019-09-03 | 上海联影医疗科技有限公司 | Control method, device, computer equipment and the storage medium of tube current |
| WO2019214204A1 (en) * | 2018-05-09 | 2019-11-14 | 苏州博思得电气有限公司 | Filament current control method and apparatus |
| CN112816929A (en) * | 2021-01-04 | 2021-05-18 | 明峰医疗系统股份有限公司 | CT equipment bulb tube filament current calibration system and method and CT equipment |
| CN113777397A (en) * | 2021-09-18 | 2021-12-10 | 成诺智家张家口工程有限公司 | Dynamic detection device and detection method for power consumption of electric heating load |
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