Method and system for positioning local CT scanning with assistance of visible imaging

Abstract

The invention discloses a method and a system for positioning local CT scanning with assistance of visible imaging. The method comprises the following steps: fixing a mark graph on a tested object so as to acquire a primary position of the mark graph; controlling the tested object to rotate for N predetermined angles in a predetermined angle range according to the primary position of the mark graph, and respectively scanning the tested object under N predetermined angles to acquire scanning data; acquiring motion information of the tested object according the primary position and the current position of the mark graph, and acquiring the position information of the tested object according to the motion information; acquiring the projection data of the tested object according to the scanning data and the position information, and acquiring a local tomographic image of the tested object according to the projection data by using a local CT imaging reconstruction algorithm. According to the method, local CT scanning can be realized under the situation that mechanical control accuracy cannot be ensured due to the limit of the complex environmental conditions; the flexibility and the practicability of the system are improved; and the purposes of effective movement and flexible movement of the system can be well achieved.

Description

Technical field [0001] The present invention relates to the technical field of X-ray computer tomography, in particular to a visible light imaging assisted localization CT scanning method and system. Background technique [0002] In related technologies, the realization of CT scanning is based on X-ray sources such as X-ray machines and high-energy accelerators irradiating objects, and linear array (for example, two-dimensional scanning) or area array (for example, three-dimensional scanning) detectors are used to collect data. Among them, the scanning process obtains the light intensity data of the X-ray passing through different positions of the object at different angles through the relative rotation and translation of the object and the light source or the detector, and the tomographic image of the detected object can be reconstructed according to the obtained light intensity data. [0003] However, CT scanning usually requires high-precision control of the trajectory and relat...

AI Technical Summary

Problems solved by technology

Therefore, in order to ensure the mechanical accuracy of the CT scanning system, installing an industrial CT scanning system generally requires a long period of debugging, which leads to great difficulties in realizing the mechanical layout and control of large-sized objects with special shapes, and the C

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