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Geometry correction method of X-ray computed tomography imaging system

A technology of tomography and geometric correction, applied in material analysis using radiation, material analysis using wave/particle radiation, measurement devices, etc., can solve problems affecting imaging effects, reduce image artifacts, and improve spatial resolution. Effect

Inactive Publication Date: 2010-06-23
INST OF AUTOMATION CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In order to solve the problem that the imaging effect is affected when the horizontal offset error of the X-ray detector is large in the prior art, the purpose of the present invention is to propose a geometric correction method for an X-ray computed tomography system based on a line phantom, which is especially suitable for Correction of X-ray Detector Horizontal Offset Error in Cone Beam and Fan Beam Computed Tomography Systems in Circular Orbit

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[0023] Various details involved in the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be pointed out that the described embodiments are only intended to facilitate the understanding of the present invention, rather than limiting it in any way.

[0024] Although the embodiment is carried out under the miniature cone beam CT system, the situation is similar and applicable to the common cone beam CT system and the fan beam CT system. When using the present invention, as long as it is ensured that the diameter of the thin wire of the used wire phantom body 5 is far less than the spatial resolution (less than one-third of the spatial resolution) that the CT system can achieve, the density of the thin wire is far greater than its surrounding materials Density, the slice pixel size of CT reconstruction should be smaller than the spatial resolution that the CT system can achieve. For the used X-ra...

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Abstract

The invention relates to a geometry correction method of an X-ray computed tomography imaging system, which is especially suitable for geometry parameter correction of pencil beam and fan beam computed tomography imaging systems of a circular orbit. Horizontal offset of an X-ray detector is accurately estimated by using X-ray detector offset information of the computed tomography imaging system, included in linear mold X-ray computed tomography imaging three-dimensional reconstruction data; and the geometry correction of the X-ray computed tomography imaging system can be carried out by using the obtained horizontal offset, thereby improving the spatial resolution of the X-ray computed tomography imaging system and reducing the image artifacts.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to geometric parameter correction of an X-ray computed tomography imaging system, and is especially suitable for geometric parameter correction of circular orbit cone beam and fan beam computed tomography imaging systems. Background technique [0002] X-ray computed tomography (hereinafter referred to as CT) system plays an important role in imaging technology and industrial non-destructive testing. The geometric position parameters of the CT system have a great influence on the imaging quality. Geometric position errors can lead to a decrease in the spatial resolution of the system, produce image artifacts, and even make the reconstructed image unusable. [0003] Cone beam circular orbit CT system and fan beam circular orbit CT system are two common CT systems, and fan beam circular orbit CT system can be regarded as a special case of cone beam circular orbit CT system. Fo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/203G01N23/04G01N23/083G03B42/02
Inventor 田捷朱守平杨鑫闫国瑞
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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