Multi-scale cone-beam CT image quick three-dimensional reconstruction method based on wavelet transformation

Abstract

The invention discloses a multi-scale cone-beam CT image quick three-dimensional reconstruction method based on wavelet transformation, and the method comprises the following steps: (1), carrying out the circumferential cone-beam CT scanning of a test piece, and collecting a group of projection images for reconstruction; (2), carrying out the wavelet transformation of the collected projection images at the corresponding scales according to the difference of requirements for the resolution of reconstruction data, and obtaining a wavelet decomposition coefficient of each scale; (3), selecting the wavelet decomposition coefficient of the corresponding scale for FDK reconstruction, and continuing the operation if the FDK reconstruction of each component needs to be carried out after wavelet first-order decomposition; (4), respectively extracting cross-sectional images of the obtained reconstruction data along the y-axis, and carrying out the corresponding wavelet inverse transformation; (5), extracting the cross-sectional images of three-dimensional data, obtained after wavelet inverse transformation, along the z-axis, carrying out the linear interpolation, and obtaining a final reconstruction image. The method can quickly achieve the three-dimensional reconstruction within a certain precision range based on the FDK algorithm, and can present three-dimensional data with different resolution in the process according to different requirements.

Description

technical field [0001] The invention relates to a wavelet transform-based three-dimensional reconstruction method for multi-scale cone-beam CT images used in computer image processing, and belongs to the technical field of computer image processing. Background technique [0002] X-ray computer tomography (X-ray Computer Tomography, XCT) is an imaging technology that uses X-rays to scan objects at different angles to obtain tomographic information of objects. This technology covers physics, mathematics, computer vision, and computer graphics. It is widely used in many scientific fields, which greatly enhances people's ability to observe the internal structure of objects. Especially in medical clinical diagnosis, it is used as the best means to obtain information about the internal structure of the human body. [0003] At present, the mainstream commercial CT machine is a fan-beam CT scanner, that is to say, the X-ray source of this CT machine can only obtain the data of a ce...

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Problems solved by technology

[0005] Aiming at the time-consuming problems of the 3D reconstruction algorithm of cone beam CT and the different requirements for the resolution of the reconstructed 3D data in different applications, the present invention proposes a wavelet transform-based multi-scale cone reconstruction method that can quickly realize 3D reconstruction under the premise of ensuring accuracy. A Fast Algorithm for 3D Reconstruction of Beam CT Images

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