Spherical metal marked cone beam CT metal artifact removal system and removal method

A metal marking and metal artifact technology, which is applied in the directions of projection reproduction, 2D image generation, instruments used for radiological diagnosis, etc., to achieve the effect of less noise interference and high efficiency

Pending Publication Date: 2021-12-03
中科超精(南京)科技有限公司
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Problems solved by technology

[0003] Conventional X-rays will absorb more low-energy X-ray photons when they pass through materials with high X-ray blocking ability, such as metals. This disproportionate absorption characteristic will form strip metal artifacts

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  • Spherical metal marked cone beam CT metal artifact removal system and removal method

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0030] Such as figure 1 As mentioned above, a cone-beam CT metal artifact removal system for spherical metal markers according to the present invention includes a two-dimensional projection image metal projection area processing module, a metal projection screening module, a three-dimensional reconstruction module and a three-dimensional image processing module.

[0031] Further, the metal projection area processing module of the two-dimensional projection image obtains the separated metal mark projection area, area center and area radius on the two-dimensional projection image, and fills the metal mark projection area according to the edge pixel value to remove the metal mark Projection; the m...

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Abstract

The invention provides a spherical metal marked cone beam CT metal artifact removal system and removal method. The spherical metal marked cone beam CT metal artifact removal system belongs to the field of cone beam CT imaging and comprises a two-dimensional projection drawing metal projection area processing module, a metal projection screening module, a three-dimensional reconstruction module and a three-dimensional image processing module. The method comprises the following specific operation steps of searching a metal mark on a projection drawing; screening metal mark points according to the metal coordinate three-dimensional projection relation; processing the projection drawing, and obtaining a two-dimensional projection drawing without metal mark projection through filling by using projection peripheral information; reconstructing by using the processed projection drawing to obtain a CT image without metal marks and metal artifacts; and processing the CT image and adding the metal mark part to obtain a complete cone beam CT image. The spherical metal marking efficiency is high, and noise interference is not likely to happen.

Description

technical field [0001] The invention belongs to the field of cone-beam CT imaging, and relates to a cone-beam CT metal artifact removal system with spherical metal marks and a removal method thereof. Background technique [0002] Cone beam CT, namely CB (Cone Beam) CT, refers to the technology that the computer obtains three-dimensional tomographic images according to the reconstruction of cone beam projection images. The traditional fan-shaped CT projection data is one-dimensional, and the two-cone-beam CT projection data is two-dimensional. Compared with traditional fan-shaped CT, cone-beam CT can significantly improve the utilization rate of X-rays, accelerate data acquisition speed, and has higher Spatial resolution has been widely used. [0003] Conventional X-rays will absorb more low-energy X-ray photons when they pass through materials with high X-ray blocking ability, such as metals. This disproportionate absorption characteristic will form strip metal artifacts. ...

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Application Information

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IPC IPC(8): A61B6/03A61B6/00G06T5/00G06T7/136G06T11/00
CPCA61B6/032A61B6/4411G06T11/008G06T7/136A61B6/5205A61B6/5211A61B6/5258A61B6/4085G06T2207/10081G06T5/00
Inventor 不公告发明人
Owner 中科超精(南京)科技有限公司
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