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Cone beam X-ray oral cavity tomography image algorithm

A tomographic and X-ray technology, applied in the field of medical imaging, can solve problems such as incompleteness and uneven projection data, and achieve the effects of noise suppression, solving two-dimensional image reconstruction problems, and high image quality.

Inactive Publication Date: 2018-02-02
JIANGSU MEILUN IMAGING SYST
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Problems solved by technology

But in the case of incomplete or highly noisy projection data, the algorithm is no longer applicable
However, in the process of practical application, due to some objective reasons, it is often not able to meet its requirements, and the collected projection data is often uneven or incomplete.

Method used

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  • Cone beam X-ray oral cavity tomography image algorithm

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Embodiment 1

[0020] see figure 1 As shown, a cone-beam X-ray oral tomography algorithm includes the following steps:

[0021] (1) Use the grid to discretize the image to be reconstructed and assign an initial value ;

[0022] (2) At the initial value On the basis of , the image is projected at various angles, the simulation value of the projection is calculated, and the projection coefficient matrix W is established;

[0023] (3) Within the scope of mutual constraints of the POCS reconstruction method, compare the projection simulation value calculated in step (2) with the real projection value at the same angle to obtain a difference, and based on this difference, each image The pixel value of the grid is iteratively corrected;

[0024] (4) Repeat step (3) to the end of the iteration to obtain the reconstructed image.

[0025] In the above, when considering the actual pixel value of the image, make Take 255 when it is greater than 255, and take 0 when it is less than 0.

[0026]...

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Abstract

The invention discloses a cone beam X-ray oral cavity tomography image algorithm, and the algorithm comprises the following steps: (1), carrying out the discretization processing of a to-be-reconstructed image through a grid, and giving an initial value (shown in the description); (2), carrying out the projection of the image at each angle on the basis of the initial value (shown in the description), calculating and obtaining a projection simulation value, and building a projection coefficient matrix W; (3), carrying out the comparison of the projection simulation value calculated at step (2)and a real projection value at the same angle in a mutual constraint range of a POCS reconstruction method, obtaining a difference value, and carrying out the iterative correction of the pixel valuesof each grid of the image according to the difference value; (4), repeatedly carrying out step (3) till the iteration is finished, and obtaining a reconstructed image. The algorithm achieves the enhanced imaging effect and a three-dimensional reconstruction effect through the improvement of a conventional iteration algorithm.

Description

technical field [0001] The invention relates to the field of medical imaging, in particular to a cone-beam X-ray oral tomography algorithm. Background technique [0002] X-ray tomography is a technical means to non-destructively obtain the internal structure information of objects by using the attenuation characteristics of radiation on matter. Oral CT has many advantages as a non-invasive detection technology, which has been widely used in medical diagnosis and industrial non-destructive testing. In recent years, cone beam has been more and more widely used in medicine and industry. It has the characteristics of high precision, low radiation dose, and fast scanning speed, and has become one of the future technological development trends. With the development of stomatology, dental cone beams have been widely used. The oral cavity can reflect tissues from different angles, discover more subtle lesions, and accurately evaluate bone tissue and mandibular joint conditions, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
CPCG06T11/008G06T2207/10116G06T2207/30036
Inventor 王燕妮
Owner JIANGSU MEILUN IMAGING SYST
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