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Universal ct alignment method

A technology of rotating the axis and directly above, which is applied in the field of general CT axis alignment, and can solve the problem of moving the positioning point out of the field of view

Active Publication Date: 2022-05-13
UNIV OF SCI & TECH OF CHINA
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, with small imaging fields of view, a small off-axis distance of the anchor point may cause the anchor point to move out of the field of view when the sample is rotated

Method used

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Embodiment Construction

[0029] When the CT rotation angle is limited or the field of view is small, the conventional CT alignment method is no longer applicable. In synchrotron radiation soft X-ray nanomicroscopic imaging, the imaging field of view is small, and the rotation angle of the CT process is less than 180°. In order to improve the alignment efficiency, the present invention proposes a general CT alignment method to quickly complete the alignment before CT.

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0031] Such as figure 2 Shown is a flow chart of a general CT axis alignment method; wherein, the method includes the following steps:

[0032] Image the anchor point at three rotational angle positions;

[0033] According to the imaging geometric relationship, move the anchor p...

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Abstract

The present invention provides a general CT axis alignment method, which includes the following steps: imaging the positioning point at three rotation angle positions; calculating the position of the positioning point relative to the rotation axis according to the imaging geometric relationship and moving the positioning point to the rotational position directly above the axis.

Description

technical field [0001] The invention relates to the technical fields of synchrotron radiation CT imaging, X-ray CT imaging and non-destructive three-dimensional detection, in particular to a general CT axis alignment method. Background technique [0002] CT (Computed tomography) is a three-dimensional imaging technology. By collecting two-dimensional images of rotating samples under multiple viewing angles, the CT reconstruction algorithm is used to complete three-dimensional imaging of objects. In order to make full use of the effective imaging area of ​​the detector, it is necessary to make the rotation axis image at the center of the detector in the horizontal direction as much as possible during the CT process, and the center of the sample (or the selected positioning point) is placed directly above the rotation axis, so the opposite axis is CT A very important content in imaging. It is assumed that the Z axis is the direction of the optical axis, the Y axis is the dire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B15/04G01N23/046
CPCG01B15/04G01N23/046
Inventor 吴朝关勇刘刚田扬超陈亮
Owner UNIV OF SCI & TECH OF CHINA
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