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.