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Method and system of X ray image three-dimensional reconstruction

A three-dimensional reconstruction and X-ray technology, which is applied in the field of medical image processing, can solve the problems that it is inconvenient for doctors to observe comprehensively, and cannot obtain a multi-angle or three-dimensional image of the subject, so as to achieve the effect of comprehensive observation

Inactive Publication Date: 2009-02-25
BEIJING NORMAL UNIV ZHUHAI
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Problems solved by technology

Among the existing X-ray imaging technologies, two-dimensional CR and DR have the advantages of simple equipment and low cost compared with three-dimensional CT, but they can only obtain two-dimensional images of a certain angle or at most certain angles of the object, and cannot obtain The target is a multi-angle or three-dimensional image, which is not convenient for doctors to conduct comprehensive observation and make correct diagnosis and treatment

Method used

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  • Method and system of X ray image three-dimensional reconstruction

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Embodiment 1

[0035] see figure 2 , first measure or calibrate the X-ray imaging system parameters D, R, d 0 . D is the distance between the X-ray source S and the area array detector, R is the distance between the X-ray source S and the rotation center axis of the object to be measured, d 0 is the pixel pitch of the area array detector (the supplier of the area array detector can provide this parameter).

[0036] see image 3 , to rotate the X-ray imaging system or the stage, so that the imaging system and the object on the stage undergo relative circular or helical motion, and perform image sampling. S is the X-ray tube, which moves along a circular track (sampling circle), and the track of the area array detector opposite to it is also a circle (in the case of a C-arm, the area array detector and the X-ray tube will be in the movement on the same sampling circle). The object to be measured is placed on the stage, the centerline SO of the X-ray cone ray beam passes through the centr...

Embodiment 2

[0050] see Figure 4 , S is the X-ray tube, which moves along a circular trajectory (sampling circle), and the trajectory of the area array detector opposite to it is also a circle (in the case of a C-arm, the area array detector and the X-ray tube will be moving on the same sampling circle). The object to be measured is placed on the stage, the centerline SO of the X-ray cone ray beam passes through the central axis of rotation and is perpendicular to the area array detector, intersecting i 0 , corresponding to the i-th projection image 0 Column of pixels, a non-central line L of the X-ray cone beam i Point i on the intersecting surface array detector corresponds to the i-th column of pixels in the projected image, and the angle between the ray Li and the central line SO is β i , the angle between the central line SO and the reference axis (X axis) is θ. A frame of image I(θ) is collected at every θ angle, and the collected image data is compressed and stored in computer ...

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Abstract

The invention discloses a method for three-dimensional reconstruction of x-ray images and includes the following steps: (1) obtaining the parameters of an imaging system by means of measurement or calibration; (2) sampling projection images; (3) building image data indexes; (4) setting viewpoint parameters; (5) computing view line parameters; (6) indexing and searching image data; (7) processing images; (8) displaying images. The invention also discloses an x-ray three-dimensional reconstruction system. Though the method and the system for three-dimensional reconstruction of x-ray images provided in the invention adopt a low-cost two-dimension x-ray image pick-up device, a multi-perspective three-dimensional image of an object to be measured can be obtained; so that doctors can carry out complete observation and perform correct diagnosis and treatment.

Description

technical field [0001] The invention relates to medical image processing technology, in particular to a method and system for reconstructing a three-dimensional image of an object according to two-dimensional X-ray image data. Background technique [0002] X-ray imaging technology is widely used in medical diagnosis, industrial non-destructive testing and scientific research. The X-ray imaging technology used in medical diagnosis can be divided into two categories: two-dimensional and three-dimensional. Two-dimensional has X-ray film, CR and DR, and three-dimensional has CT. Among them, the X-ray film is to record the intensity of X-rays passing through the object (such as the human body) to form a latent image on the photosensitive film, and then obtain the image of the object through development and fixing. The X-ray film imaging process is long, and the images obtained are analog, which is not convenient for modern computer processing and communication transmission, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/00G01N23/04G01T1/161G06T5/00
Inventor 王光学
Owner BEIJING NORMAL UNIV ZHUHAI
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