CN106413236B - A kind of exposure parameter method of adjustment and device - Google Patents
A kind of exposure parameter method of adjustment and device Download PDFInfo
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- CN106413236B CN106413236B CN201610810753.8A CN201610810753A CN106413236B CN 106413236 B CN106413236 B CN 106413236B CN 201610810753 A CN201610810753 A CN 201610810753A CN 106413236 B CN106413236 B CN 106413236B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
- H05G1/26—Measuring, controlling or protecting
- H05G1/30—Controlling
- H05G1/46—Combined control of different quantities, e.g. exposure time as well as voltage or current
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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
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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
- A61B6/54—Control of apparatus or devices for radiation diagnosis
Abstract
The application, which provides a kind of exposure parameter method of adjustment and device, wherein method, to be included：The grey parameter of the area-of-interest in pre-exposure light image is obtained, the pre-exposure light image is obtained by carrying out pre-exposure to subject；Exposure parameter during according to the grey parameter, pre-exposure, obtains the equivalent thickness of the subject；According to the equivalent thickness, the expectation grey parameter of the area-of-interest, exposure parameter during formal exposure is determined, the exposure parameter includes tube voltage kv and exposure dose mAs, and the tube voltage kv and exposure dose mAs is used in formally exposing.The application improves the picture quality controlled using AEC when exposing.
Description
Technical field
This application involves Medical Devices technology, more particularly to a kind of exposure parameter method of adjustment and device.
Background technology
Digital radiography (Digital Radiography, referred to as：DR) equipment is because its dose of radiation is small, image matter
Measure the advantages that high and be widely used, in order to obtain preferable picture quality, it is necessary to set suitable exposure parameter for DR equipment,
The parameter can include：Tube voltage (kv) and exposure dose (milliampere-second mAs) for the bulb for producing ray.In traditional approach
In, doctor can determine above-mentioned exposure parameter according to patient characteristics such as the height of patient, weight, and with reference to the subjective experience of oneself
Value, but the mode of this manual setting exposure parameter is completely dependent on the subjective experience of doctor, lack science it is theoretical according to
According to causing the stability of picture quality poor.The shortcomings that in order to overcome above-mentioned Manual exposure to control, currently start AEC
(Automatic Exposure Control, auto-exposure control) technology is applied to DR equipment, which can be with adjust automatically
Exposure parameter.
The parameter adjustment mode of one of which AEC is Re-exposing method, and this method includes pre-exposure and formal exposure two
Stage, when pre-exposure, can rule of thumb pre-set a kind of exposure parameter, and the exposure image obtained according to pre-exposure is to pre-
If exposure parameter be adjusted, the parameter after adjustment will be more accurate, in formal exposure.For example, it can calculate pre-
The average gray of obtained exposure image is exposed, and according to average gray and it is expected that gray scale is adjusted coefficient, passes through the adjustment
Coefficient is adjusted the exposure dose (mAs) in exposure parameter.But found in practical application, this Re-exposing method adjustment
Exposure parameter afterwards, ideal picture quality still cannot be obtained when formal exposure uses.
The content of the invention
In view of this, the application provides a kind of exposure parameter method of adjustment and device, when being exposed with improving using AEC controls
Picture quality.
Specifically, the application is achieved by the following technical solution：
First aspect, there is provided a kind of exposure parameter method of adjustment, the described method includes：
The grey parameter of the area-of-interest in pre-exposure light image is obtained, the pre-exposure light image is by carrying out subject
Pre-exposure obtains；
Exposure parameter during according to the grey parameter, pre-exposure, obtains the equivalent thickness of the subject；
According to the equivalent thickness, the expectation grey parameter of the area-of-interest, exposure ginseng during formal exposure is determined
Number, the exposure parameter include tube voltage kv and exposure dose mAs, and the tube voltage kv and exposure dose mAs is used for just
In formula exposure.
Second aspect, there is provided a kind of exposure parameter adjusting apparatus, described device include：
Parameter acquisition module, for obtaining the grey parameter of the area-of-interest in pre-exposure light image, the pre-exposure figure
As being obtained by carrying out pre-exposure to subject；
Thickness determining module, exposure parameter during for according to the grey parameter, pre-exposure, obtains the subject
Equivalent thickness；
Processing module is adjusted, for the expectation grey parameter according to the equivalent thickness, the area-of-interest, is determined just
Exposure parameter when formula exposes, the exposure parameter includes tube voltage kv and exposure dose mAs, by the tube voltage kv and exposure
Light dosage mAs is used in formally exposing.
The exposure parameter method of adjustment and device that the application provides, by using ginseng constant in pre-exposure and formal exposure
Number equivalent thickness, establishes the parameters relationship between exposure parameter and the grey parameter of exposure image so that parameter adjustment and ash
Quantitative relationship between degree change is more accurate, but also can adjust tube voltage kv and exposure dose according to this quantitative relationship
Two kinds of exposure parameters of mAs, a kind of exposure parameter mAs can only be adjusted relative in traditional approach according to simple gray scales method,
Accurately adjustment gradation of image will be more capable of in the parameter adjustment of this programme, picture quality when improving using AEC control exposures.
Brief description of the drawings
Fig. 1 is a kind of principle schematic of AEC systems shown in one exemplary embodiment of the application；
Fig. 2 is a kind of trimming process flow chart shown in one exemplary embodiment of the application；
Fig. 3 is a kind of exposure environment schematic shown in one exemplary embodiment of the application；
Fig. 4 is a kind of die body thickness chart picture of ladder die body generation shown in one exemplary embodiment of the application；
Fig. 5 is a kind of die body thickness chart picture of wedge-shaped die body generation shown in one exemplary embodiment of the application；
Fig. 6 is a kind of exposure image of ladder die body shown in one exemplary embodiment of the application；
Fig. 7 is a kind of exposure image of wedge-shaped die body shown in one exemplary embodiment of the application；
Fig. 8 is a kind of application process flow chart shown in one exemplary embodiment of the application；
Fig. 9 is a kind of flow to the segmentation of pre-exposure display foreground shown in one exemplary embodiment of the application；
Figure 10 is a kind of statistics grey level histogram of effective image shown in one exemplary embodiment of the application；
Figure 11 is a kind of hardware structure diagram of DR equipment shown in one exemplary embodiment of the application；
Figure 12 is a kind of structure of exposure parameter adjusting apparatus shown in one exemplary embodiment of the application；
Figure 13 is the structure of another exposure parameter adjusting apparatus shown in one exemplary embodiment of the application.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During attached drawing, unless otherwise indicated, the same numbers in different attached drawings represent the same or similar key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects be described in detail in claims, the application.
AEC is a kind of can to overcome the manual exposure in traditional approach with the technology of adjust automatically DR equipment exposure parameters
The defects of photocontrol precision is low.Fig. 1 illustrates a kind of principle sketch of the AEC systems in DR equipment, which can apply
In Re-exposing method, (Re-exposing method is one of which AEC control modes, and AEC control technologies also have other modes, for example ionize
Room control methods).As shown in Figure 1, control machine 11 can be used for generating the exposure parameters such as tube voltage (kv), exposure dose (mAs), and
These exposure parameters are issued to high pressure generator 12, high pressure generator 12 controls bulb 13 to launch exposure and penetrates according to exposure parameter
Line (e.g., x-ray).After exposed radiation passes through subject 14, received by detector 15, control machine 11 can also be according to detector 15
The exposure image of the ray generation subject 14 received, can be used for the medical diagnosis to subject 14.Wherein, control machine 11
The exposure parameter of generation it is suitable whether, directly influence the quality of post-exposure image, also, by adjusting exposure parameter example
Such as exposure dose (mAs), can also reach the effect of adjustment exposure image quality.
Exposure parameter method of adjustment provided by the embodiments of the present application, you can applied to the AEC ginsengs in framework shown in above-mentioned Fig. 1
Several adjustment, and the parameter adjustment is used in re-expose AEC controls.In Re-exposing method, pre-exposure can be included
Light and formally two stages of exposure, when pre-exposure, can rule of thumb pre-set a kind of exposure parameter, pass through the default exposure
Parameter is exposed subject, the exposure image of the subject obtained further according to pre-exposure, and default exposure parameter is carried out
Adjustment, the parameter after adjustment will be more accurate, for formally being exposed to subject in formal exposure, usual pre-exposure light step
It is few when the dosage of section is than formal exposure.
The exposure parameter method of adjustment of the present embodiment, that is, describe how to adjust the exposure parameter that sets during pre-exposure
Parameter that is whole, being used when formally being exposed, can be specifically thick using parameter equivalent constant in pre-exposure and formal exposure
Degree, Parameter Switch when establishing by pre-exposure photophase to formal exposure stage, has obtained the ash of exposure parameter and exposure image
The parameters relationship between parameter is spent, so that the quantitative relationship between parameter adjustment and grey scale change is more accurate, but also
Two kinds of exposure parameters of tube voltage kv and exposure dose mAs can be adjusted according to this quantitative relationship, be obtained by parameter adjustment
More accurate parameter so that formally expose obtained picture quality and be improved.
In order to enable parameter adjustment is more accurate, in exposure parameter method of adjustment provided by the embodiments of the present application, including " school
Just " and " application " two parts, wherein, " correction " stage mainly establishes required use during exposure parameter adjusts by sampled data
The parameters relationship model arrived, such as, which can include the relation between exposure parameter and the gradation of image of exposure image, should
Model can be applied to " apply " stage, and " application " stage starts formally to be exposed scanning to subject (e.g., patient).
In " correction " and " application ", all include pre-exposure and formal exposure respectively, such as, above-mentioned model is established by re-expose, or
Person builds picture by the scanning that re-expose is completed to subject." correction " and " application " process will be described respectively as follows.
Trimming process
The trimming process is mainly used for establishing during subsequent applications the parameters relationship used.In this example, correcting
Process uses die body, re-expose is carried out to die body, also, in pre-exposure and formal exposure, obtain corresponding exposure respectively
The grey parameter of parameter, die body thickness and image, and these three parameters under pre-exposure and formal conditions of exposure are established respectively
Between relational model.
It should also be noted that, relational model during pre-exposure and relational model during formal exposure, rely between the two
" equivalent thickness " is contacted, because equivalent thickness is in the constant factor of pre-exposure and formally two stages of exposure." equivalent thickness
Degree " i.e. using certain material die body simulation specific composition human body when die body thickness, the die body of identical equivalent thickness with
Human body can realize the effect of approximate power spectrum decay.Actual people's body thickness can be converted into the equivalent thickness of corresponding die body.
Fig. 2 illustrates the flow chart of trimming process, and this example does not limit the execution sequence of each step.Including：
In step 201, exposure environment is determined, which includes die body, bulb and detector.
In this step, it may be determined that the spatial relation of bulb, die body and detector, the sampling exposure to die body will
Carried out under conditions of this relative tertiary location is constant.Fig. 3 illustrates a kind of exposure environment.
In step 202, according to the die body thickness model established in the case where exposing environment, the equivalent thickness of die body is calculated.
In this example, the die body thickness model that can establish exposed radiation through die body formation that bulb is sent (also can letter
Claim thickness model), when which is used to determine that exposed radiation passes through die body, length of the exposed radiation in the range of die body
Degree.By taking the exemplary exposure environment of Fig. 3 as an example, the foundation of thickness model is as follows：
If ray source position is Ps=(xs,ys,zs), the position of ray through arrival flat panel detector after die body is Pd=
(xd,yd,zd), the unit direction of ray is(Pd≠Ps), then PsWith PdBetween straight line L
(Ps,Pd), following space line parametric equation is represented by, wherein, t in equation below represents stepping coefficient, in equation
(x, y, z) represents the corresponding three directions coordinate of any point on straight line：
Length T (P of the straight line in the range of die bodys,Pd) be：
Wherein,
Wherein, phantom, that is, die body.
In addition, in order to more intuitively understand the equivalent thickness calculated according to thickness model as a result, can be according to above-mentioned pre-
The die body thickness model of foundation, generates the thickness chart picture of die body.The die body thickness chart that Fig. 4 is generated when illustrating using ladder die body
Picture, the die body thickness chart picture that Fig. 5 is generated when illustrating using wedge-shaped die body.Wherein, the different place of gray scale in thickness chart picture
Expression there is different equivalent thickness, such as, by Fig. 3 it can also be seen that the different parts of ladder die body can have it is different
Thickness, i.e., same die body can be different in the equivalent thickness of different parts.Die body difference portion can be determined according to thickness chart picture
The equivalent thickness of position, it is assumed that the step-thickness image shown in Fig. 4 includes six different equivalent thickness, is respectively
RadThick-1, radThick-2, radThick-3 are until radThick-6.
In step 203, die body is exposed with different conditions of exposures in pre-exposure and formal exposure respectively,
Obtain the exposure image of die body.
In this step, in pre-exposure or formal exposure, exposure parameter can be converted die body is exposed, for example,
Setting tube voltage is kv-1, exposure dose is that mAs-1 carries out a pre-exposure to die body, obtains the pre-exposure light image of die body, connects
That " kv-2, mAs-2 " (wherein, at least expose used by pre-exposure and formal exposure in exposure parameter with another group of exposure parameter
Light dosage mAs is different) formally exposed, obtain the formal exposure image of die body.Then, then convert exposure parameter pipe electricity
Press as kv-3, exposure dose mAs-3, another secondary re-expose is carried out to die body, i.e., is by kv-3, exposure dose of tube voltage
MAs-3 carries out a pre-exposure again, and " kv-4, mAs-4 " are formally exposed with dawn parameter.Fig. 6 and Fig. 7 illustrates difference
With ladder die body and wedge-shaped die body, the exposure image formally obtained during exposure.
In step 204, the sample data under different exposure is obtained under pre-exposure and formal exposure respectively.
, can be with according to the obtained exposure image of exposure when carrying out die body exposure in step 203 with a certain exposure parameter
Determine the grey parameter of the corresponding exposure image under exposure parameter.Such as with tube voltage kv-1, exposure dose mAs-1
When carrying out pre-exposure to die body, the gradation of image parameter of the pre-exposure light image of the die body can be obtained, with tube voltage kv-2, exposure
When dosage mAs-2 formally exposes die body, the gradation of image parameter of the formal exposure image of the die body can be obtained.And
In this double exposure, for the thickness chart of die body as constant, i.e. the equivalent thickness of die body is constant, equivalent to the mould to same equivalent thickness
For body, conversion exposure parameter is exposed to have obtained corresponding different images.
By taking the ladder die body exposure image shown in Fig. 6 as an example, the exposure image of Fig. 6 is as corresponding to the thickness chart of Fig. 4
Die body is exposed to obtain, and the image ash of the die body different equivalent thickness of corresponding diagram 4 respectively can be found in the exposure image
Parameter is spent, which can be the average gray of area-of-interest in image.
For example, comparison diagram 4 and Fig. 6, the position of equivalent thickness radThick-1, the exposure after pre-exposure in corresponding die body
The average gray of image is Graypre- 1, similarly, the position of equivalent thickness radThick-2, the exposure after pre-exposure in corresponding die body
The average gray of light image is Graypre- 2, corresponding sample data of multigroup thickness with gray scale can be obtained.Convert pre-exposure
When exposure parameter tube voltage is kv-2, exposure dose is mAs-2, die body is exposed, and corresponding exposure diagram can be obtained
Picture, at this time the average gray of image will change.As table 1 below illustrates the sample data gathered in a kind of pre-exposure, only show
Example partial data：
1 pre-exposure sample data of table gathers
By table 1, it can be seen that, in the sample data of pre-exposure, the equivalent thickness of die body is constant, when converting exposure parameter,
The grey parameter of exposure image will change；Similarly, when formally being exposed to die body, the sample number of similar table 1 can also be obtained
According to no longer enumerating.I.e. in this step, the sample of multigroup exposure parameter, equivalent thickness and grey parameter when having obtained pre-exposure
This, can also equally obtain multigroup parameter in formal exposure.These parameters can be used for establishing parameter pass in subsequent step
It is model.
In step 205, according to sample data, the parameters relationship under pre-exposure and formal exposure is established respectively.
The parameters relationship between equivalent thickness and tube voltage kv, unit gray scale can be established in this example, under pre-exposure, such as
Under formula (1) shown in：
RadThick=f (kv, UnitGraypre)....................(1)
Wherein, radThick is equivalent thickness, UnitGraypreFor pre-exposure when unit gray scale.
Unit gray scale can be calculated according to formula (2)：
Wherein, GraypreFor the average gray of pre-exposure, mAspreFor pre-exposure when exposure parameter milliampere-second.
The parameters relationship between unit gray scale and tube voltage kv, equivalent thickness can be obtained under formal exposure, as follows
Shown in formula (3), wherein, the unit gray scale of the exposure image when unit gray scale in the formula (3) is formal exposure, tube voltage
Exposure parameter when kv is also formal exposure.
UnitGray=f (kv, radThick) ... ... .. (3)
Above-mentioned formula (1) and the parameters relationship of formula (3), can be obtained by support vector machines or fitting of a polynomial.
By above-mentioned trimming process, the parameters relationship of formula (1) and the corresponding pre-exposure of formula (3) and formal is established
Parameters relationship during exposure, and equivalent thickness radThick is identical in the two formula.It can be seen according to above-mentioned formula
Arrive, in pre-exposure, exposure parameter when can be according to pre-exposure is (for example, kv, mAspre) and pre-exposure light image gray scale ginseng
Number is (for example, Graypre、UnitGraypre), obtain the equivalent thickness of subject (for example, die body)；And in formal exposure, etc.
Effect thickness remains unchanged, exposure parameter tube voltage when can be according to the above-mentioned equivalent thickness being calculated and formal exposure
Kv, the unit gray scale of exposure image when being calculated formal exposure.
Wherein, the acquisition of exposure parameter tube voltage kv during formal exposure, can be by the following method：Can be rule of thumb
The mapping relationship searching table between equivalent thickness and tube voltage kv is pre-established, and can also be according to the mapping relationship searching table
By interpolation method, the mapping relations that determine arbitrary equivalent thickness between the tube voltage kv that formally exposes.So subsequently should
, can be according to the tube voltage kv that the mapping relations are formally exposed after obtaining equivalent thickness in.Wherein, above-mentioned mapping is closed
It is that look-up table can be according to clinical test, or human emulation die body is tested, calculated according to a large number of experiments etc.
Thickness is imitated, then observes picture quality, for given equivalent thickness, selects the preferable tube voltage kv of picture quality.
In addition, during the unit gray scale of exposure image when formally being exposed, with reference to formula (2) it can be seen that, can be with
According to the unit gray scale and it is expected gray scale, mAs when formally being exposed：
Wherein, Target_Gray is the expectation gray scale of the exposure image formally exposed, is a kind of desired preferable average ash
Degree.
So far, the parameters relationship of exposure parameter adjustment institute foundation is obtained, such as formula (1) to formula (4).
Application process
The application process is to carry out formal scanning to subject to build picture, equally to carry out re-expose, using subject as
Exemplified by patient, this process will carry out patient pre-exposure and formal exposure, and utilize correction above in pre-exposure photophase
During the parameters relationship established, determine a formal exposure institute exposure parameter to be used.
Fig. 8 illustrates the flow chart of application process, and this example does not limit the execution sequence of each step.Including：
In step 801, pre-exposure is carried out to patient, obtains pre-exposure light image.
In this step, the exposure parameter of pre-exposure can be set previously according to experience, for example, can be according to the body of patient
The conditions such as height, weight, age establish pre-exposure optical condition table, search during for pre-exposure and use.Pass through the exposure parameter pair of pre-exposure
Patient carries out pre-exposure, can obtain pre-exposure light image.
In step 802, the grey parameter of the area-of-interest in pre-exposure light image is obtained.
This step can obtain the gray scale of the area-of-interest (Region of Interest, ROI) in pre-exposure light image
Parameter, the grey parameter can be average gray.Wherein, the quantity of the ROI in pre-exposure light image can be one or more, when
These ROI can be integrated when multiple and calculate average gray.
In one example, it is in order to enable more accurate to the gray count of pre-exposure light image, can be to pre-exposure light image
Foreground segmentation is carried out, obtains foreground image section.Pre-exposure light image can usually include foreground image section and background image portion
Point, foreground image section is object region, and background image portion is the region outside target image, according to foreground image portion
Calculating gray scale is divided can more to accurately reflect the quality of image.This example can extract the foreground image section in pre-exposure light image
Out, the grey parameter of the area-of-interest in foreground image section is calculated, the process of this part foreground segmentation will retouch in fig.9
State.
Fig. 9 illustrates the flow that foreground segmentation is carried out to pre-exposure light image, can include：
In step 901, beam-defining clipper detection is carried out to pre-exposure light image, extracts the pre-exposure light image in beam-defining clipper scope
Interior effective image.
This step can carry out beam-defining clipper detection to pre-exposure light image, first extract the effective image in beam-defining clipper.
For example, it is smooth that suitable low-pass filter can be selected to carry out pre-exposure light image first, the interference of noise on image is excluded.Cause
Linearly be distributed for beam-defining clipper, thus can use Hough transformation, Radon transform or gradient algorithm isoline detection method into
Row detection.After detecting beam-defining clipper, the effective image in beam-defining clipper is extracted.
In step 902, the grey level histogram of the effective image is counted.
This step can count the grey level histogram of effective image in the range of pre-exposure light image beam-defining clipper, and to histogram into
Row smoothing processing, prepares to search histogram Wave crest and wave trough.Such as Figure 10 illustrates histogram, the transverse axis of the histogram represents
Image intensity value, the i.e. corresponding gray scale of each pixel, the longitudinal axis represent the pixel of the gray value included in pre-exposure light image
Number.
In step 903, the gray value of the trough of threshold condition will be met as separation threshold value in the grey level histogram.
Travel through each Wave crest and wave trough from right to left in histogram, when meeting at least one condition of following two conditions,
The gray value for the trough for determining to meet the condition is segmentation threshold：
Condition one：When the gray scale number of certain valley value is less than certain threshold value.For example, by taking Figure 10 as an example, it is assumed that some trough
The gray value of corresponding transverse axis is 1500, and the longitudinal axis represents for the pixel that gray value included in pre-exposure light image is 1500
Count, the threshold value in the condition one is the threshold value of the gray scale number set, and the value for being the longitudinal axis is provided with a threshold value.
Condition two：The wave crest gray scale number of the trough both sides and the ratio or difference of the valley value gray scale number are greater than one
Determine threshold value.For example, usually there are two wave crests, left wave crest and right wave crest in trough both sides, each wave crest also has on the corresponding longitudinal axis
Value, that is, gray scale number, will be by the gray scale number of the wave crest and the gray scale of trough for any of which wave crest
Number does ratio and does difference.Assuming that " the gray scale number of gray scale number/trough of wave crest " is labeled as ratio B, by " the ash of wave crest
Spend the gray scale number of number-trough " difference C is labeled as, fractional threshold B1 and difference threshold C1 can be set respectively, then this
Part two, which limits, needs B to be more than B1, and C is more than C1.Two wave crests of trough both sides, can select that wherein longitudinal axis value is bigger one
A wave crest carries out above-mentioned comparison, meets above-mentioned ratio and difference condition.
When meet two above condition it is at least one when, the gray value for determining the trough is segmentation threshold.Shown in Figure 10
For the histogram and its threshold value of pre-exposure light image, it is segmentation threshold that dotted line, which marks part,.
In step 904, the corresponding image section of gray scale of the separation threshold value will be less than in image as foreground image
Part.
In step 803, exposure parameter during according to the grey parameter, pre-exposure, obtains the equivalent of the subject
Thickness.
For example, the grey parameter of the area-of-interest in the pre-exposure light image got in step 802, is average gray.
This step can first combine formula (2), and exposure dose mAs during according to average gray and pre-exposure, obtains pre-exposure light image
Unit gray scale.
Then in conjunction with formula (1), the parameters relationship between kv and equivalent thickness during according to unit gray scale, pre-exposure, obtains
To the equivalent thickness at patent exposure position.
In step 804, according to the equivalent thickness, the expectation grey parameter of the area-of-interest, formal expose is determined
The exposure parameter of light time, the exposure parameter include tube voltage kv and exposure dose mAs.
For example, can be according to the equivalent thickness obtained in step 803, and combine reflecting between equivalent thickness and tube voltage kv
Relation is penetrated, determines tube voltage kv during formal exposure corresponding with the equivalent thickness.
Then formula (3) can be combined, tube voltage kv during according to equivalent thickness, formal exposure and list during formal exposure
Parameters relationship between the gray scale of position, unit gray scale when formally being exposed.
Formula (4) is finally combined, according to the expectation grey parameter and unit gray scale of area-of-interest, when formally being exposed
Exposure dose mAs.
In step 805, calculated tube voltage kv and exposure dose mAs, formally expose subject.
The exposure parameter method of adjustment of the present embodiment, can be applied in the AEC controls of Re-exposing method execution, and lead to
Parameter equivalent thickness constant in pre-exposure and formal exposure is crossed, is established between exposure parameter and the grey parameter of exposure image
Parameters relationship so that the quantitative relationship between parameter adjustment and grey scale change is more accurate, but also can be according to this amount
Change relation adjusts two kinds of exposure parameters of tube voltage kv and exposure dose mAs, relative to can only be according to simple ash in traditional approach
Spend rule of three and adjust a kind of exposure parameter mAs, the parameter adjustment of this programme will be more capable of accurately adjustment gradation of image, raising and adopt
Picture quality when exposing is controlled with AEC.
Corresponding to the above method, the application provides a kind of exposure parameter adjusting apparatus at the same time.It is different according to the scene of application,
Described device can be the service logic or the equipment of hardware or software and hardware combining realized by software.Below with
Software introduces the application device exemplified by realizing.Software is the place by equipment where it as the device on a logical meaning
Corresponding computer program instructions in nonvolatile memory are read what operation in memory was formed by reason device.As shown in figure 11,
For in an example, the hardware structure diagram of DR equipment where the application software service.The equipment is except including processor
1101st, outside memory 1102, I/O interface 1103 and nonvolatile memory 1104, other hardware may be further included, to this not
Repeat again.
Figure 12 is a kind of structure diagram of exposure parameter adjusting apparatus of the embodiment of the present application, as shown in figure 12, the dress
Putting to include：Parameter acquisition module 1201, thickness determining module 1202 and adjustment processing module 1203；Wherein,
Parameter acquisition module 1201, for obtaining the grey parameter of the area-of-interest in pre-exposure light image, the pre-exposure
Light image is obtained by carrying out pre-exposure to subject；
Thickness determining module 1202, exposure parameter during for according to the grey parameter, pre-exposure, obtains described tested
The equivalent thickness of body；
Processing module 1203 is adjusted, for the expectation grey parameter according to the equivalent thickness, the area-of-interest, really
Exposure parameter during fixed formal exposure, the exposure parameter include kv and mAs, and the kv and mAs is used in formally exposing.
In one example, the grey parameter of the area-of-interest in the pre-exposure light image, is average gray；
Thickness determining module 1202, mAs during specifically for according to the average gray and pre-exposure, obtains unit ash
Degree；The parameters relationship between kv and equivalent thickness during according to the unit gray scale, pre-exposure, obtains the equivalent of the subject
Thickness.
In one example, processing module 1203 is adjusted, specifically for according to the parameters relationship between equivalent thickness and kv,
Determine kv during formal exposure corresponding with the equivalent thickness；Kv during according to the equivalent thickness, formal exposure with it is formal
The parameters relationship between unit gray scale during exposure, unit gray scale when formally being exposed；According to the area-of-interest
It is expected grey parameter and unit gray scale, mAs when formally being exposed.
In one example, as shown in figure 13, which can also include：
Model elaborates module 1204, for carrying out pre-exposure and formal exposure to die body, establishes the parameters relationship；Bag
Include：According to pre-established die body thickness model, the equivalent thickness of the corresponding die body under exposure parameter, the die body thickness are determined
Model is used to determine length when exposed radiation passes through die body in the range of die body；According to die body progress pre-exposure and just
The exposure image that formula exposes, determines the grey parameter of the corresponding exposure image under exposure parameter；Establish the exposure
The parameters relationship between optical parameter, equivalent thickness and grey parameter.
In one example, parameter acquisition module 1201, are additionally operable to：Area-of-interest in pre-exposure light image is obtained
Before grey parameter, beam-defining clipper detection is carried out to the pre-exposure light image, extracts the pre-exposure light image in the range of beam-defining clipper
Effective image；Count the grey level histogram of the effective image；It will meet the trough of threshold condition in the grey level histogram
Gray value as separate threshold value, less than it is described separation threshold value the corresponding image section of gray scale as foreground image section；
The area-of-interest is extracted in the foreground image section.
The foregoing is merely the preferred embodiment of the application, not limiting the application, all essences in the application
God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of the application protection.
Claims (10)
- A kind of 1. exposure parameter method of adjustment, it is characterised in that the described method includes：The grey parameter of the area-of-interest in pre-exposure light image is obtained, the pre-exposure light image to subject by carrying out pre-exposure Light obtains；Exposure parameter during according to the grey parameter, pre-exposure, obtains the equivalent thickness of the subject；According to the equivalent thickness, the expectation grey parameter of the area-of-interest, exposure parameter during formal exposure, institute are determined Stating exposure parameter includes tube voltage kv and exposure dose mAs, and the tube voltage kv and exposure dose mAs is used to formally expose In；It is described according to the equivalent thickness, the expectation grey parameter of the area-of-interest, determine exposure ginseng during formal exposure Number, including：Determine tube voltage kv during formal exposure corresponding with the equivalent thickness；Parameter between tube voltage kv during according to the equivalent thickness, formal exposure and unit gray scale during formal exposure is closed System, unit gray scale when formally being exposed；According to the expectation grey parameter and unit gray scale of the area-of-interest, exposure dose mAs when formally being exposed.
- 2. the according to the method described in claim 1, it is characterized in that, gray scale ginseng of the area-of-interest in the pre-exposure light image Number, is average gray；Exposure parameter during according to the grey parameter, pre-exposure, obtains the equivalent thickness of subject, including：Exposure dose mAs during according to the average gray and pre-exposure, obtains unit gray scale；The parameters relationship between tube voltage kv and equivalent thickness during according to the unit gray scale, pre-exposure, obtains described tested The equivalent thickness of body.
- 3. according to the method described in claim 1, it is characterized in that, described determine formal exposure corresponding with the equivalent thickness When tube voltage kv, including：According to the parameters relationship between equivalent thickness and tube voltage kv, determine corresponding with the equivalent thickness when formally exposing Tube voltage kv.
- 4. according to the method in claim 2 or 3, it is characterised in that the method further includes：To die body carry out pre-exposure and Formal exposure, establishes the parameters relationship；Including：According to pre-established die body thickness model, the equivalent thickness of the corresponding die body under exposure parameter is determined, the die body is thick Degree model is used to determine length when exposed radiation passes through die body in the range of die body；According to carrying out pre-exposure and formally exposing obtained exposure image to the die body, the corresponding institute under exposure parameter is determined State the grey parameter of exposure image；Establish the parameters relationship between the exposure parameter, equivalent thickness and grey parameter.
- 5. the according to the method described in claim 1, it is characterized in that, ash for obtaining the area-of-interest in pre-exposure light image Parameter is spent, is further included before：Beam-defining clipper detection is carried out to the pre-exposure light image, extracts effectively figure of the pre-exposure light image in the range of beam-defining clipper Picture；Count the grey level histogram of the effective image；It will meet the gray value of the trough of threshold condition in the grey level histogram as threshold value is separated, less than the separation threshold value The corresponding image section of gray scale as foreground image section；The area-of-interest is extracted in the foreground image section.
- 6. a kind of exposure parameter adjusting apparatus, it is characterised in that described device includes：Parameter acquisition module, for obtaining the grey parameter of the area-of-interest in pre-exposure light image, the pre-exposure light image is led to Cross and subject progress pre-exposure is obtained；Thickness determining module, exposure parameter during for according to the grey parameter, pre-exposure, obtains the equivalent of the subject Thickness；Processing module is adjusted, for the expectation grey parameter according to the equivalent thickness, the area-of-interest, determines formal expose The exposure parameter of light time, the exposure parameter include tube voltage kv and exposure dose mAs, by the tube voltage kv and exposure agent MAs is measured to be used in formally exposing；The adjustment processing module, specifically for determining tube voltage kv during formal exposure corresponding with the equivalent thickness；Root Parameters relationship between tube voltage kv during according to the equivalent thickness, formal exposure and unit gray scale during formal exposure, obtains Unit gray scale during formal exposure；According to the expectation grey parameter and unit gray scale of the area-of-interest, formally exposed When exposure dose mAs.
- 7. device according to claim 6, it is characterised in that the gray scale ginseng of the area-of-interest in the pre-exposure light image Number, is average gray；The thickness determining module, exposure dose mAs during specifically for according to the average gray and pre-exposure, obtains unit Gray scale；The parameters relationship between tube voltage kv and equivalent thickness during according to the unit gray scale, pre-exposure, obtains described tested The equivalent thickness of body.
- 8. device according to claim 6, it is characterised in thatThe adjustment processing module, in definite tube voltage kv, specifically for according to the ginseng between equivalent thickness and tube voltage kv Number relation, determines tube voltage kv during formal exposure corresponding with the equivalent thickness.
- 9. the device according to claim 7 or 8, it is characterised in that described device further includes：Model elaborates module, for carrying out pre-exposure and formal exposure to die body, establishes the parameters relationship；Including：According to pre- The die body thickness model of foundation, determines the equivalent thickness of the corresponding die body under exposure parameter, and the die body thickness model is used for Determine the length in the range of die body when exposed radiation passes through die body；Carry out pre-exposure according to the die body and formally expose The exposure image arrived, determines the grey parameter of the corresponding exposure image under exposure parameter；Establish the exposure parameter, etc. Imitate the parameters relationship between thickness and grey parameter.
- 10. device according to claim 6, it is characterised in thatThe parameter acquisition module, is additionally operable to：Before the grey parameter of the area-of-interest in obtaining pre-exposure light image, to institute State pre-exposure light image and carry out beam-defining clipper detection, extract effective image of the pre-exposure light image in the range of beam-defining clipper；Statistics institute State the grey level histogram of effective image；The gray value of the trough of threshold condition will be met as separation threshold in the grey level histogram Value, less than the corresponding image section of gray scale for separating threshold value as foreground image section；In the foreground image section Extract the area-of-interest.
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