CN110097597B - Coordinate corresponding method for series X-ray images of target object - Google Patents

Coordinate corresponding method for series X-ray images of target object Download PDF

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CN110097597B
CN110097597B CN201910376664.0A CN201910376664A CN110097597B CN 110097597 B CN110097597 B CN 110097597B CN 201910376664 A CN201910376664 A CN 201910376664A CN 110097597 B CN110097597 B CN 110097597B
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江少恩
任宽
曹柱荣
董建军
杨志文
杨家敏
王峰
张保汉
丁永坤
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Laser Fusion Research Center China Academy of Engineering Physics
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Abstract

The invention discloses a coordinate corresponding method of a series of X-ray images of a target object. The method comprises the following steps: a. recording a series of X-ray images of a target object, summing the X-ray intensities recorded by the recording units in each X-ray image to obtain the total intensity of each X-ray to obtain A; b. multiplying the X-ray intensity of each recording unit in each X-ray image by the corresponding two-dimensional coordinate, and summing to obtain B; c.C = B/A, and the light intensity barycentric coordinates of each X-ray image are obtained; d. and giving a two-dimensional coordinate corresponding relation of each X-ray image in the series of X-ray images by utilizing the attribute corresponding to the light intensity barycentric coordinate of each X-ray image in the series of X-ray images. The method can realize the accurate correspondence of the coordinates of each X-ray image in different observation directions, quantitatively analyze the time evolution of the coordinates of each X-ray image in different time periods, and ensure that the coordinate correspondence precision reaches the spatial resolution level of an imaging system, thereby having wide and important application prospect in inertial confinement fusion, laboratory celestial body physics or high-energy density physics.

Description

Coordinate corresponding method for series X-ray images of target object
Technical Field
The invention belongs to the field of X-ray image data processing, and particularly relates to a coordinate corresponding method of a series of X-ray images of a target object.
Background
X-ray imaging is very widely used in inertial confinement fusion, laboratory celestial physics, and high energy density physical scientific research for diagnosing two-dimensional spatial, time-resolved information of three-dimensional targets, such as fusion shots, radiation sources, and substances under extreme conditions. In general, in two-dimensional spatially resolved diagnosis, one obtains a plurality of X-ray images of different observation positions, and the above scientific research needs to accurately correspond the images to one another through coordinates, because important information such as electron temperature, electron density, symmetry analysis and the like can be given through the correspondence. In time-resolved diagnosis, people can obtain a plurality of X-ray images which change along with time, and related scientific researches need to quantitatively analyze the coordinate time evolution of the images so as to research the problems of symmetry change and the like.
The existing X-ray image data processing has the following defects: 1. for the space resolution X-ray imaging diagnosis of different observation directions, according to the projection principle and the non-uniformity of target light emission, the obtained X-ray images of different observation directions are obviously different, which comprises the difference of space intensity distribution and appearance geometry, so that the X-ray images are difficult to realize the accurate correspondence of coordinates; 2. for time-resolved X-ray imaging diagnosis at different time periods, since the X-ray light state of the target object changes along with the time evolution, the obtained X-ray images at different time periods are also obviously different, which also includes the difference of space intensity distribution and shape geometry, but how to quantitatively analyze the coordinate time evolution of the images still lacks a corresponding coordinate corresponding method.
Disclosure of Invention
The invention aims to provide a coordinate corresponding method of a series of X-ray images of a target object.
The coordinate correspondence method of the series of X-ray images of the target object comprises the following steps:
a. recording a series of X-ray images of a target object, summing the X-ray intensities recorded by the recording units in each X-ray image to obtain the total intensity of each X-ray to obtain A;
b. multiplying the X-ray intensity of each recording unit in each X-ray image by the corresponding two-dimensional coordinate, and summing to obtain B;
c.C = B/A, and the light intensity barycentric coordinates of each X-ray image are obtained;
d. and giving a two-dimensional coordinate corresponding relation of each X-ray image in the series of X-ray images by utilizing the attribute corresponding to the light intensity barycentric coordinate of each X-ray image in the series of X-ray images.
The X-ray image is formed by one of a pinhole, a Kirkpatrick-Baez mirror or a curved crystal imaging device.
The series of X-ray images comprise X-ray images recorded at different positions aiming at the same target object, or X-ray images recorded at different time periods.
The coordinate corresponding method of the series X-ray images of the target object is applied to the data processing of the X-ray images of the target object in inertial confinement fusion, laboratory celestial body physics or high-energy density physics.
The coordinate corresponding method of the series X-ray images of the target object of the invention comprises the steps of obtaining the total intensity A of each X-ray, the sum B of the product of the X-ray intensity of each recording unit in each X-ray image and the corresponding two-dimensional coordinate, and the corresponding relation between the light intensity barycentric coordinate C of each X-ray image and the two-dimensional coordinate of each X-ray image through manual recording, software or programming.
The coordinate corresponding method of the series X-ray images of the target object has the following advantages:
1. the accurate correspondence of the coordinates of each X-ray image in different observation directions can be realized.
2. The time evolution of the coordinates of each X-ray image in different time periods can be quantitatively analyzed.
3. The coordinate corresponding precision reaches the spatial resolution level of the imaging system.
The coordinate correspondence method of the series X-ray images of the target object can realize the accurate correspondence and quantitative analysis of the coordinates of the series X-ray images, and has wide and important application prospects in inertial confinement fusion, laboratory celestial body physics or high-energy density physics.
Drawings
Fig. 1 is a projection coordinate diagram of a coordinate mapping method of a series of X-ray images of an object according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The coordinate correspondence method of the series of X-ray images of the target object comprises the following steps:
a. recording a series of X-ray images of a target object, summing the X-ray intensities recorded by the recording units in each X-ray image to obtain the total intensity of each X-ray to obtain A;
b. multiplying the X-ray intensity of each recording unit in each X-ray image by the corresponding two-dimensional coordinate, and summing to obtain B;
c.C = B/A, and the light intensity barycentric coordinates of each X-ray image are obtained;
d. and giving a two-dimensional coordinate corresponding relation of each X-ray image in the series of X-ray images by utilizing the attribute corresponding to the light intensity barycentric coordinate of each X-ray image in the series of X-ray images.
The X-ray image is formed by one of a pinhole, a Kirkpatrick-Baez mirror or a curved crystal imaging device.
The series of X-ray images comprise X-ray images recorded at different positions aiming at the same target object, or X-ray images recorded at different time periods.
The coordinate corresponding method of the series X-ray images of the target object is applied to the data processing of the X-ray images of the target object in inertial confinement fusion, laboratory celestial body physics or high-energy density physics.
Example 1
The X-ray image is formed by a pinhole. The series of X-ray images are recorded in different directions aiming at the same target object. The coordinate corresponding method of the series X-ray images of the target object is applied to the data processing of the X-ray images of the target object in inertial confinement fusion.
According to basic physical knowledge, a mass-integrated two-dimensional projection is carried out on a mass object to different directions, and the gravity centers of the mass object are fixed on each projection plane and correspond to each other one by one. I.e. the centre of gravity of the three-dimensional object must pass the centre of gravity of the two-dimensional projection in the projection direction. If the object mass is exchanged for the intensity of the X-ray source, the conclusion is consistent, i.e. the center of gravity of the intensity of the X-ray source of the object must pass through the center of gravity of the intensity of the two-dimensional projection in the projection direction (viewing direction).
The light intensity distribution of the X-ray source of the target object is
Figure 598904DEST_PATH_IMAGE002
See FIG. 1, along the observation direction
Figure 578361DEST_PATH_IMAGE004
Is projected as
Figure 358098DEST_PATH_IMAGE006
（1）
Figure 815624DEST_PATH_IMAGE008
（2）
Wherein the content of the first and second substances,
Figure 629997DEST_PATH_IMAGE010
is that
Figure DEST_PATH_IMAGE011
In that
Figure DEST_PATH_IMAGE013
Projection of a plane and
Figure DEST_PATH_IMAGE015
the included angle of the axes is set by the angle,
Figure DEST_PATH_IMAGE017
is that
Figure 577093DEST_PATH_IMAGE004
And
Figure DEST_PATH_IMAGE018
the included angle of the plane is formed by the angle,
Figure DEST_PATH_IMAGE020
is a rotation matrix of three-dimensional coordinates
Figure DEST_PATH_IMAGE022
（3）
Let the X-ray source of the object have the light intensity barycentric coordinate of
Figure DEST_PATH_IMAGE024
The light intensity barycentric coordinate of each projected X-ray image is C
Figure DEST_PATH_IMAGE026
According to the definition of the center of gravity
Figure DEST_PATH_IMAGE028
（4）
T is the intensity of the X-ray source of the target
Figure DEST_PATH_IMAGE030
Is the total intensity of the X-ray source of the three-dimensional object. The light intensity barycentric coordinate C of each X-ray image projected (observed)
Figure DEST_PATH_IMAGE032
Figure DEST_PATH_IMAGE034
（5）
Wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE036
the sum B of the products of the X-ray intensities of the recording elements in each X-ray image and the corresponding two-dimensional coordinates,
Figure DEST_PATH_IMAGE038
for projecting (observing) the intensity of X-ray images
Figure DEST_PATH_IMAGE040
I.e. the total intensity a of each X-ray projected (observed).
Figure DEST_PATH_IMAGE041
The relationship with T is
Figure DEST_PATH_IMAGE043
（6）
Wherein
Figure DEST_PATH_IMAGE045
R is a constant related to R for the solid angle occupied by the projection (observation) X-ray image to the target X-ray source.
Figure DEST_PATH_IMAGE046
Is that
Figure 283274DEST_PATH_IMAGE024
Obtained by two rotations, the relationship between the two is still determined by formula (2), i.e.
Figure DEST_PATH_IMAGE048
（7）
Where S is the matrix formed by the first and second rows of the matrix K, i.e.
Figure DEST_PATH_IMAGE050
（8）
Therefore, the total intensity A of each X-ray is extracted from each X-ray image
Figure 609738DEST_PATH_IMAGE038
And then extracting the sum B of the product of the X-ray intensity of each recording unit in each X-ray image and the corresponding two-dimensional coordinate, thus obtaining the light intensity barycentric coordinate C of each X-ray image through the formula (5). And (4) giving a two-dimensional coordinate corresponding relation of each X-ray image in the series of X-ray images according to a formula (7), namely, by utilizing the attribute corresponding to the light intensity barycentric coordinate of each X-ray image in the series of X-ray images. The coordinate correspondence accuracy thus obtained is determined by the spatial resolution of the pinhole imaging system, and is of the order of 10 μm.
In addition, after the coordinate corresponding relation is determined, quantitative research of various X-ray images with energy spectrum resolution is carried out, so that the electron temperature and the electron density can be extracted according to the X-ray radiation property, such as a common bremsstrahlung mechanism. And evaluating the three-dimensional symmetry of the X-ray emission of the target object according to all coordinate corresponding conditions.
Example 2
This example is the same as the example 1 except that the X-ray image was formed by a Kirkpatrick-Baez mirror. The series of X-ray images are recorded aiming at the same target object in different time periods. The coordinate correspondence method of the series X-ray images of the target object is applied to the data processing of the X-ray images of the target object in high-energy density physics. After the light intensity gravity center coordinate C of each X-ray image is obtained through the formula (5), the time evolution of the coordinates of each X-ray image in different time periods can be quantitatively analyzed by comparing the distance change between the light intensity gravity center and the geometric center of each X-ray image, and therefore the symmetrical change trend of the target object is researched. The coordinate correspondence accuracy thus obtained is determined by the spatial resolution of the Kirkpatrick-Baez mirror imaging system, of the order of 2.5 μm.
The embodiment can also be applied to the X-ray image data processing of the target object in the physical treatment of the celestial body in a laboratory.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.

Claims (4)

1. A method for mapping coordinates of a series of X-ray images of an object, said method comprising the steps of:
a. recording a series of X-ray images of a target object, summing the X-ray intensities recorded by the recording units in each X-ray image to obtain the total intensity of each X-ray to obtain A;
b. multiplying the X-ray intensity of each recording unit in each X-ray image by the corresponding two-dimensional coordinate, and summing to obtain B;
c.C = B/A, and the light intensity barycentric coordinates of each X-ray image are obtained;
d. and giving a two-dimensional coordinate corresponding relation of each X-ray image in the series of X-ray images by utilizing the attribute corresponding to the light intensity barycentric coordinate of each X-ray image in the series of X-ray images.
2. The method of claim 1, wherein the X-ray image is an X-ray image formed by one of a pinhole, a Kirkpatrick-Baez mirror, or a curved crystal imaging device.
3. The method of claim 1, wherein the series of X-ray images includes X-ray images recorded at different orientations or time periods for the same object.
4. The coordinate mapping method of the series of X-ray images of the target object according to any one of claims 1 to 3, wherein the coordinate mapping method is applied to the data processing of the X-ray images of the target object in inertial confinement fusion, laboratory celestial physics or high energy density physics.
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