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Cone beam CT (computed tomography) fast reconstruction method based on rectangular bounding box

A bounding box and rectangular technology, applied in the field of image reconstruction of CT system, can solve the problems of unsuitable cone-beam CT, etc., achieve the effect of reducing the number of reconstruction voxels, reducing memory consumption, and improving reconstruction speed

Inactive Publication Date: 2011-09-14
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

Zhang Shunli, Zhang Dinghua, Zhao Xinbo and others in the "Journal of Computer-Aided Design and Graphics" (2009, 21(2): 160-164) "Fast CT image reconstruction based on the smallest area" aimed at the linear array parallel beam CT reconstruction method A fast CT reconstruction method based on the minimum area is proposed, which further reduces the calculation amount of reconstruction in 2D CT reconstruction, but this method is not suitable for cone beam CT

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  • Cone beam CT (computed tomography) fast reconstruction method based on rectangular bounding box

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[0026] Utilize main component to be the cone beam CT system of Varian PaxScan 2520 detector, YXLON 450kV X-ray source, on the computer of Intel Core II 2.33GHz processor, 2G memory, implement the step of the inventive method as follows:

[0027] (1) Carry out cone-beam CT circular scanning on a specimen, collect a group of 360 projection images of 1536×1920, and cut all projection images of this group into a group of squares with a side length of 512 pixels according to the center position and size Projection image, at this time, ensure that the group of square projection images is at least 20 pixels larger than the projection of the test piece;

[0028] (2) According to a group of square projection images obtained in step (1), calculate the size of the rectangular bounding box of the specimen in the reconstruction space, set its length, width, and height as L, W, and H respectively, and the unit is pixel, specifically Proceed as follows:

[0029] 1) Set the column direction ...

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Abstract

The invention discloses a cone beam CT (computed tomography) fast reconstruction method based on a rectangular bounding box. The method comprises the following steps of: carrying out cone beam CT circular scanning on a test piece, acquiring a set of projection images and cutting the projection images into a set of square projection images with the side length of E pixels; calculating the size of the rectangular bounding box of the test piece in a reconstruction space, and respectively calculating logarithm images of the square projection images; carrying out filtering treatment in an FDK (Feldkamp) algorithm on the logarithm images; distributing a single-precision floating-point memory space from a computer according to the size of the rectangular bounding box, and carrying out cone beam CT reconstruction calculation by adopting a single-instruction multi-data technology according to a Z-line prior reconstruction algorithm; and storing a reconstruction result as serial section images on the X direction, the Y direction or the Z direction according to a coordinate system thereof. The invention effectively improves the reconstruction speed of the cone beam CT and reduces the requirements of the reconstruction algorithm on the memory size.

Description

technical field [0001] The invention belongs to the field of CT system image reconstruction, and relates to a whole set of solutions for fast reconstruction of CT images in a cone-beam CT system. Background technique [0002] Computed Tomography (CT) is an imaging technology that obtains internal tomographic image information of the measured object by reconstructing the ray projections from different angles of the object. Cone-beam CT uses a cone-beam X-ray source and an area array detector to collect the projection data of the measured object. Compared with traditional two-dimensional CT, cone-beam CT can reconstruct hundreds or even thousands of tomographic images in one scan. It has the characteristics of high ray utilization rate, continuous slices, the same spatial resolution within and between slices, and high precision. [0003] A key issue in the application of cone beam CT is to improve the image reconstruction speed. At present, in the commercial field, the most ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T11/00
Inventor 黄魁东张定华李明君卜昆程云勇
Owner NORTHWESTERN POLYTECHNICAL UNIV
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