C-arm tomography imaging method using semi-accurate filtered back-projection

A filter back projection and tomographic imaging technology, applied in the field of biomedical imaging, can solve problems that affect the accuracy of reconstruction results, are not conducive to parallel processing of algorithms, and resampling of projection data, etc.

Inactive Publication Date: 2013-03-20
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

Therefore, although the Katsevich type algorithm can obtain more accurate reconstruction results, the complex calculation process of the structure factor is not conducive to the parallel processing of the algorithm, thus reducing the computational efficiency of the reconstruction algorithm
In addition, Katsevich-type reconstruction algorithms have filter lines along the vert

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  • C-arm tomography imaging method using semi-accurate filtered back-projection

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[0033] The present invention is specifically described below through the examples, it is necessary to point out that the present examples are only used to further illustrate the present invention, and can not be interpreted as limiting the protection scope of the invention, those skilled in the art can according to the above-mentioned present invention Some non-essential improvements and adjustments made in the content of the invention.

[0034] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] figure 1 Shown is a C-arm imaging device, which includes a type C-arm 1, one end of which is equipped with an X-ray source 2 for generating X-rays 3, which form a cone beam in space for emission; The other end of the arm 1 is equipped with a two-dimensional plane detector 4, the detector is composed of some array elements 5, and each array element 5 can sense the X-ray 3 attenuation signal passing through the pa...

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Abstract

The invention discloses a tomography imaging method suitable for C-arm imaging equipment. The tomography imaging method is characterized by having shift invariant features, wherein the semi-accurate reconstruction is performed on cone-beam projection data obtained by scanning a circular arc track. The circular arc track is a short scanning track, namely a scanning track of pi and a fan angle, and is also an ultra-short scanning track, namely a track smaller than the short scanning track. The method comprises the following steps: weighing of partial derivatives of projection data; one-dimensional Hilbert transform in a horizontal or non-horizontal direction; and back projection of the circular arc track. Compared with FDK type-approximate reconstruction algorithms, the C-arm tomography imaging method using semi-accurate filtered back-projection has the advantages of small reconstruction accuracy error, small discretization error and the like.

Description

technical field [0001] The invention relates to a C-arm semi-precise filtering back-projection tomographic imaging method, which belongs to the field of biomedical imaging and is suitable for C-arm X-ray tomographic imaging. Background technique [0002] The C-arm imaging system is mainly composed of a C-arm, an X-ray source and a flat-panel detector installed at both ends of the C-arm. The X-ray optical signal emitted by the X-ray source forms a cone beam in space, and the C-arm can rotate around the horizontal axis in a limited space with a maximum angle range. At the same time, the flat panel detector can collect the X-ray attenuated light Signal. These light signals can in turn be converted into cone beam projection data, which can be used to reconstruct CT tomographic images. The C-arm with CT tomography function has important application value in clinical diagnosis and surgical evaluation, and is an important technology with broad application prospects. [0003] For...

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Application Information

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IPC IPC(8): A61B6/02
Inventor 王瑜李迅波陈亮王成栋汪忠来梁巍黄建龙
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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