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

A bounding box and rectangle technology, applied in the field of CT system image reconstruction, can solve problems such as inapplicability of cone beam CT, and achieve the effect of reducing the number of reconstructed voxels, memory consumption, and memory size requirements.

Inactive Publication Date: 2010-11-17
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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[0026] Using a cone-beam CT system whose main components are Varian PaxScan 2520 detector and YXLON 450kV X-ray source, on a computer with Intel Core II 2.33GHz processor and 2G memory, the steps of implementing the method of the present invention are as follows:

[0027] (1) Carry out cone-beam CT circular scanning on a test piece, collect a group of 360 1536×1920 projection images, and crop all the projection images in the group into a group of squares with 512 pixels on each side according to the center position and size Project the image. At this time, it can be ensured that the square projection image is at least 20 pixels larger than the test piece projection;

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

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

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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 complete set of solutions for rapid reconstruction of CT images in a cone beam CT system. Background technique [0002] Computer tomography (Computed Tomography, CT) is an imaging technology that obtains tomographic image information of the interior of the object by reconstructing 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 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. High ray utilization, 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 increase the speed of image reconstruction. At present, the most widely used in the commercial field is the FDK f...

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Application Information

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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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