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Rotary X-ray contrastographic picture iteration reconstruction method

A technique of contrast image and iterative reconstruction, applied in the computer field, can solve the problem of insufficient storage

Inactive Publication Date: 2012-12-26
SOUTHEAST UNIV
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Problems solved by technology

However, since the spatial resolution of this imaging system is higher than that of general cone-beam CT, the computational complexity of this reconstruction problem is far greater than that of cone-beam CT image reconstruction.
The operation of the iterative algorithm is mainly concentrated in the two links of projection and back-projection. The fast calculation of projection and back-projection has become the main bottleneck of the three-dimensional reconstruction of rotational X-ray angiography imaging. The use of projection matrix can greatly speed up the operation of projection and back-projection. The computing speed is high, but limited by the hardware conditions, the current computer memory storage capacity is not enough to store the projection matrix of the rotation imaging system

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  • Rotary X-ray contrastographic picture iteration reconstruction method
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  • Rotary X-ray contrastographic picture iteration reconstruction method

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Embodiment Construction

[0047] The method for iterative reconstruction of rotational X-ray contrast images of the present invention comprises the following steps:

[0048] 1) Read the scan data file from the rotating X-ray angiography device, save the projection sequence image and record the following parameters: the distance SDD from the ray source to the detection board, the distance SOD from the ray source to the rotation center of the C-arm, the rotation angle of each projection sample, and the projection image The pixel side length is h, the length of the projected image is U pixel units and the width is V pixel units, the size of the projected image is consistent with the pixel size of the two-dimensional projection space, each pixel unit is a square with a length of h, and the coordinates of the two-dimensional projection space are determined Axis u, v, and coordinate axes u, v are parallel to the length and width directions of the two-dimensional projection space respectively. According to the...

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Abstract

The invention discloses a rotary X-ray contrastographic picture iteration reconstruction method which comprises the following steps of: firstly, constructing a low-resolution projection matrix in a first stage, disassembling a complete matrix into two components of a single-angle matrix and a rotary matrix for simplifying and storing; secondly, on the basis of obtaining the low-resolution projection matrix in the first stage in a second stage, further simplifying based a projection content; and finally, carrying out three-dimensional blood vessel reconstruction in a third stage. According to the rotary X-ray contrastographic picture iteration reconstruction method, due to the adoption of the projection matrix subjected to mask simplification, the problems of overlarge back projection amount and overlong computing time of the projection of a rotary X-ray contrastographic system are solved, a three-dimensional blood vessel structure can be effectively obtained, and a clinical doctor is helped for carrying out diagnosis.

Description

technical field [0001] The invention belongs to the technical field of computers, and relates to an iterative reconstruction method of a rotating X-ray contrast image. Background technique [0002] Rotational X-ray coronary angiography is another coronary imaging technique that has received widespread attention since biplane angiography. Through this technology, physicians can provide a complete and accurate observation of the shape and movement of blood vessels from multiple angles, which is of great significance to the diagnosis and treatment of cerebrovascular tumors and coronary heart disease. However, it is difficult to have an intuitive and accurate understanding of the specific structure of coronary arteries only by rotating image sequences. Therefore, the three-dimensional reconstruction of angiography has become a research hotspot in the current academic field, and it is also an important problem that medical device manufacturers need to solve urgently. The imaging...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
Inventor 胡轶宁谢理哲沈傲东罗立民
Owner SOUTHEAST UNIV
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