CN105574816A - Method and device for eliminating grid shadows of X-ray images as well as X-ray machine updating package - Google Patents
Method and device for eliminating grid shadows of X-ray images as well as X-ray machine updating package Download PDFInfo
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Abstract
The invention relates to a method and device for eliminating the grid shadows of X-ray images as well as an X-ray machine updating package. The method comprises the following steps: obtaining the frequency of a grid; detecting the direction of the grid; and eliminating the grid shadow according to the frequency and the direction.
Description
Technical field
The present invention relates to a kind of method and device of image procossing, particularly relate to a kind of method, device and the X-ray machine upgrade kit of eliminating the grid shadow of x-ray image.
Background technology
Grid in X-ray machine can filtering scattered ray, thus improves the contrast of x-ray image.But grid itself also can produce corresponding image on x-ray image, this image is referred to as grid shadow or grid artifact.
Eliminate grid shadow, generally need frequency and the direction of knowing grid.The method of existing elimination grating shadow, be all the frequency of grid and direction known and carry out in fixing unmodifiable situation.That is, the method for the elimination grating shadow on a certain X-ray machine can only be used for the grating shadow eliminating this X-ray machine, and the method for the elimination grating shadow in certain a set of upgrade kit also can only be applicable to the grid shadow in some frequency and direction.
After analog X-ray machine being upgraded to digital X-ray machine by upgrade kit, because the grid shadow removing method comprised in upgrade kit does not know frequency and the trend of the grid in the analog X-ray machine be upgraded, like this, the method continuing to use existing elimination grid shadow cannot be applicable to the various analog X-ray machine with the grid of different attribute by making upgrade kit.
So, need to provide a kind of method, device and the X-ray machine upgrade kit of eliminating the grid shadow of x-ray image, the grid shadow in various frequency and direction can be eliminated.
Summary of the invention
An embodiment provides a kind of method eliminating the grid shadow of x-ray image, comprising: the frequency obtaining grid; Detect the direction of grid; And eliminate grid shadow according to frequency and direction.。
Another embodiment of the present invention provides a kind of device eliminating the grid shadow of x-ray image, comprising: frequency acquisition module, for obtaining the frequency of grid; Direction acquisition module, for detecting the direction of grid; And grid shadow cancellation module, for eliminating grid shadow according to frequency and direction.
Another embodiment of the present invention provides a kind of X-ray machine upgrade kit, comprises the device of the grid shadow according to elimination x-ray image of the present invention.
Accompanying drawing explanation
Be described for embodiments of the invention in conjunction with the drawings, the present invention may be better understood, in the accompanying drawings:
Figure 1 shows that the schematic flow sheet of an embodiment of the method for the grid shadow of elimination x-ray image of the present invention;
Figure 2 shows that the schematic flow sheet of an embodiment in the direction of the detection grid in the process of the grid shadow of elimination x-ray image of the present invention;
Figure 3 shows that the schematic flow sheet of another embodiment in the direction of the detection grid in the process of the grid shadow of elimination x-ray image of the present invention;
Figure 4 shows that the schematic block diagram of an embodiment of the device of the grid shadow of elimination x-ray image of the present invention.
Embodiment
Below will describe the specific embodiment of the present invention, and it is pointed out that in the specific descriptions process of these embodiments, in order to carry out brief and concise description, this instructions can not all do detailed description to all features of the embodiment of reality.Should be understandable that; in the actual implementation process of any one embodiment; as in the process of any one engineering project or design item; in order to realize the objectives of developer; in order to meet that system is correlated with or that business is relevant restriction; usually can make various concrete decision-making, and this also can change to another kind of embodiment from a kind of embodiment.In addition, it will also be appreciated that, although the effort made in this performance history may be complicated and tediously long, but for those of ordinary skill in the art relevant to content disclosed by the invention, some designs that the basis of the technology contents of disclosure exposure is carried out, manufacture or production etc. changes just conventional technological means, not should be understood to content of the present disclosure insufficient.
Unless otherwise defined, the technical term used in claims and instructions or scientific terminology should be in the technical field of the invention the ordinary meaning that the personage with general technical ability understands." first ", " second " that use in patent application specification of the present invention and claims and similar word do not represent any order, quantity or importance, and are only used to distinguish different ingredients.The similar word such as " one " or " one " does not represent restricted number, but represents to there is at least one." comprise " or the similar word such as " comprising " mean to appear at " comprising " or " comprising " before element or object contain the element or object and equivalent element thereof that appear at " comprising " or " comprising " presented hereinafter, do not get rid of other elements or object." connection " or " being connected " etc. similar word be not defined in physics or the connection of machinery, be also not limited to direct or indirectly connect.
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with the specific embodiment of the invention and corresponding accompanying drawing, technical solution of the present invention is clearly and completely described.Obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
With reference to figure 1, Figure 1 shows that the schematic flow sheet of an embodiment of the method 100 of elimination grid shadow of the present invention.Method 100 can comprise following steps 101 to 103.
In a step 101, the frequency of grid is obtained.
In one embodiment of the invention, the frequency of the grid set by the mode such as user interface, order line by configuration personnel or user can be read.
In one embodiment of the invention, user can be allowed to set the frequency of maximum two grids, thus support a machine two kinds of grids, or make this method can be used in two in turn to simulate on X-ray machines and use.
In a step 102, the direction of grid is detected.
In one embodiment of the invention, step 102 can comprise sub-step 201 to 203 as shown in Figure 2.
In sub-step 201, Fourier transform is carried out to x-ray image and obtains spectral image.
Specifically, exactly x-ray image is carried out to the Fourier transform of two dimension, obtain the spectral image corresponding to this x-ray image.
In sub-step 202, on two axles in the reflection grid direction of spectral image, search for the maximal value of spectral image respectively.
The direction that two kinds of two of spectral image axially corresponding respectively grids are possible: laterally or longitudinally.In one embodiment of the invention, can on spectral image, respectively along the maximal values of these two axial search spectral images, obtain spectral image at the first maximal value axially and spectral image in the second maximal value axially.
In sub-step 203, compare two maximal values and using corresponding to larger maximal value axially as the direction of grid.
In this sub-step, by comparing two maximal values obtained in sub-step 202, the greater in both can be obtained, and then the axis corresponding to the greater can be defined as the direction of grid.
In another embodiment of the present invention, step 102 can comprise sub-step 301 to 304 as shown in Figure 3.Wherein, sub-step 301 to 302 is similar with above-mentioned sub-step 201 to 202, repeats no more here.
In sub-step 303, calculate maximal value its height at presented in the axial direction peak.
Specifically, sub-step 303 to calculate respectively exactly two maximal values obtaining in sub-step 302 its height at presented in the axial direction peak (Peak).
In one embodiment of the invention, can by this maximal value with relative size that is adjacent, homoaxial spectral image value with it, weigh this maximal value its height at presented in the axial direction peak.
In one embodiment of the invention, can first select multiple adjacent with this maximal value and in the spectral image value of same point axially, and the spectral image calculating these consecutive point is worth mean value, then calculate this maximal value in the ratio of this mean value, using this ratio as maximal value its height at presented in the axial direction peak.
In sub-step 304, compare two height and using corresponding to highly large peak axially as the direction of grid.
In this sub-step, by comparing two height values obtained in sub-step 303, the greater in both can be obtained, and then the axis corresponding to the greater can be defined as the direction of grid.
In step 103, grid shadow is eliminated according to frequency and direction.
In one embodiment of the invention, the method for existing elimination grid shadow can be adopted, and grid shadow is eliminated in the frequency of the grid obtained according to step 101 and 102 and direction.
To the method for the elimination grid shadow that described herein according to the embodiment of the present invention.Grid shadow is eliminated when method of the present invention can be applicable to frequency and direction the unknown of grid, such as: when upgrading to analog X-ray machine by upgrade kit, the inventive method performed by upgrade kit just can carry out the Processing for removing of grid shadow to the grid in the optional frequency on the simulation X-ray machine be upgraded and direction.
Similar with the method, present invention also offers corresponding device.Figure 4 shows that the schematic block diagram of an embodiment of the device of elimination grid shadow of the present invention.
As shown in Figure 4, device 400 can comprise: frequency acquisition module 401, for obtaining the frequency of grid; Direction acquisition module 402, for detecting the direction of grid; And grid shadow cancellation module 403, for eliminating grid shadow according to frequency and direction.
In one embodiment of the invention, direction acquisition module 402 may further include: Fourier transform module, obtains spectral image for carrying out Fourier transform to x-ray image; Maximum value search module, for searching for the maximal value of spectral image respectively on two axles in the reflection grid direction of spectral image; And first comparison module, for compare two maximal values and using corresponding to larger maximal value axially as the direction of grid.
In another embodiment of the present invention, direction acquisition module 402 may further include: Fourier transform module, obtains spectral image for carrying out Fourier transform to x-ray image; Maximum value search module, for searching for the maximal value of spectral image respectively on two axles in the reflection grid direction of spectral image; High computational module, for calculate described maximal value its height at presented in the axial direction peak; And second comparison module, for compare two height and using corresponding to highly large peak axially as the direction of grid.
In one embodiment of the invention, frequency acquisition module 401 may further include: read module, for reading the described frequency set by user interface.
To the device of the elimination grid shadow that described herein according to the embodiment of the present invention.Similar with said method, grid shadow is eliminated when device of the present invention can be applicable to frequency and direction the unknown of grid, such as: when upgrading to analog X-ray machine by upgrade kit, the apparatus of the present invention in upgrade kit just can carry out the Processing for removing of grid shadow to the grid in the optional frequency on the simulation X-ray machine be upgraded and direction.
The embodiment of the present invention additionally provides a kind of X-ray machine upgrade kit, and it comprises the device according to elimination grid shadow of the present invention.This X-ray machine upgrade kit may be used for analog X-ray machine to upgrade to digital X-ray machine.
The foregoing is only embodiments of the invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.
Claims (10)
1. eliminate a method for the grid shadow of x-ray image, it is characterized in that, comprising:
Obtain the frequency of grid;
Detect the direction of grid; And
Described grid shadow is eliminated according to described frequency and direction.
2. method according to claim 1, is characterized in that, the step in the direction of described detection grid comprises further:
Fourier transform is carried out to described x-ray image and obtains spectral image;
The maximal value of described spectral image is searched for respectively on two axles in the reflection grid direction of described spectral image; And
Relatively two described maximal values and using corresponding to large described maximal value axially as the direction of grid.
3. method according to claim 1, is characterized in that, the step in the direction of described detection grid comprises further:
Fourier transform is carried out to described x-ray image and obtains spectral image;
The maximal value of described spectral image is searched for respectively on two axles in the reflection grid direction of described spectral image;
Calculate described maximal value its height at presented in the axial direction peak; And
Relatively two described height and using corresponding to highly large peak axially as the direction of grid.
4. method according to claim 3, is characterized in that, described height obtains according to the ratio of described maximal value with the spectral image value corresponding to point adjacent with it.
5. method according to claim 1, is characterized in that, the step of the frequency of described acquisition grid comprises further:
Read the described frequency set by user interface.
6. eliminate a device for the grid shadow of x-ray image, it is characterized in that, comprising:
Frequency acquisition module, for obtaining the frequency of grid;
Direction acquisition module, for detecting the direction of grid; And
Grid shadow cancellation module, for eliminating described grid shadow according to described frequency and direction.
7. device according to claim 6, is characterized in that, described direction acquisition module comprises further:
Fourier transform module, obtains spectral image for carrying out Fourier transform to described x-ray image;
Maximum value search module, for searching for the maximal value of described spectral image respectively on two axles in the reflection grid direction of described spectral image; And
First comparison module, for compare two described maximal values and using corresponding to large described maximal value axially as the direction of grid.
8. device according to claim 6, is characterized in that, described direction acquisition module comprises further:
Fourier transform module, obtains spectral image for carrying out Fourier transform to described x-ray image;
Maximum value search module, for searching for the maximal value of described spectral image respectively on two axles in the reflection grid direction of described spectral image;
High computational module, for calculate described maximal value its height at presented in the axial direction peak; And
Second comparison module, for compare two described height and using corresponding to highly large peak axially as the direction of grid.
9. device according to claim 6, is characterized in that, described frequency acquisition module comprises further:
Read module, for reading the described frequency set by user interface.
10. an X-ray machine upgrade kit, is characterized in that, comprises the device according to any one in claim 6-9.
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| CN108009994A (en) * | 2017-10-25 | 2018-05-08 | 沈阳东软医疗***有限公司 | A kind of bad wire restoration method, apparatus and equipment |
| CN108065944A (en) * | 2016-11-14 | 2018-05-25 | 上海西门子医疗器械有限公司 | The adaptation method and equipment and medical imaging system of flat panel detector and grid |
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