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CBCT system geometric calibration die body self-calibration method and device and medium

A geometric calibration and self-calibration technology, applied in the field of image processing, can solve problems such as high complexity of the solution, sensitive initial solutions and easy to fall into local solutions, etc., to achieve the effect of improving the calculation accuracy

Pending Publication Date: 2021-04-09
GUANGZHOU HUARUI TECH
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  • Application Information

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Problems solved by technology

At present, some scholars use the particle swarm optimization scheme to calculate the coordinates of markers, but the complexity of the scheme is relatively high, and clinical spiral CT and specially made quality assurance (QA) phantoms are needed, and it is sensitive to the initial solution and easy to fall into the local solution.

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  • CBCT system geometric calibration die body self-calibration method and device and medium
  • CBCT system geometric calibration die body self-calibration method and device and medium
  • CBCT system geometric calibration die body self-calibration method and device and medium

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Embodiment Construction

[0050] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0051] Aiming at the problems existing in the prior art, the embodiment of the present invention provides a self-calibration method for the geometric calibration phantom of the CBCT system, such as figure 1 As shown, the method includes:

[0052] Obtain a calibration phantom, and determine the rough spatial coordinates of the calibration phantom;

[0053] Collecting the projection images of the calibration phantom under various postures, and determining the coordinates of the center position of the marker projection;

[0054] Calculating the geometric parameters of the s...

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Abstract

The invention discloses a CBCT system geometric calibration die body self-calibration method and device, equipment and a medium, and the method comprises the steps: obtaining a calibration die body, and determining the rough space coordinates of the calibration die body; acquiring projection images of the calibration die body under various positioning postures, and determining central position coordinates of marker projection; calculating system geometric parameters under each positioning posture; constructing constraint conditions and an objective function according to the central position coordinates and the system geometric parameters; and calculating a target extreme value of the target function, and calculating a target space coordinate of a marker according to the optimal extreme value. The calculation accuracy of the real spatial position of the marker is improved, and the method can be widely applied to the technical field of image processing.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a self-calibration method, device and medium of a CBCT system geometric calibration phantom. Background technique [0002] Currently, CBCT systems are widely used in medical imaging. Achieving high-resolution CBCT image reconstruction requires precise system geometry, that is, the relative positional relationship between the ray source and the detector. However, due to machining errors and installation accuracy, there is a large deviation between the actual geometric structure and the designed geometric structure, resulting in geometric artifacts in the reconstructed image, which seriously reduces the image quality. To solve the above problems, geometric calibration of the CBCT system is required. [0003] Calibration methods are mainly divided into two categories: offline calibration and online calibration. Offline calibration of phantoms using dedicated markers requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/70G16H30/20
CPCG06T7/70G16H30/20G06T2207/10081
Inventor 段晓曼陈宇思骆毅斌胡洁吕晓龙齐宏亮
Owner GUANGZHOU HUARUI TECH