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Fast Image Reconstruction Method and Device Based on Symmetric Weight Field and Rotation Reconstruction Point

A technology for reconstructing images and weight fields, applied in image generation, image data processing, 2D image generation, etc., can solve the problems of large amount of calculation, slow reconstruction speed, large amount of projection data, etc., and achieve high reconstruction speed and fast reconstruction , to improve the effect of reconstruction quality

Active Publication Date: 2020-07-17
BEIJING INFORMATION SCI & TECH UNIV
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Problems solved by technology

However, due to the large amount of projection data and the large amount of calculation for projection and back-projection, the reconstruction speed of existing image reconstruction algorithms is relatively slow, which cannot meet the needs of some specific application scenarios

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  • Fast Image Reconstruction Method and Device Based on Symmetric Weight Field and Rotation Reconstruction Point
  • Fast Image Reconstruction Method and Device Based on Symmetric Weight Field and Rotation Reconstruction Point
  • Fast Image Reconstruction Method and Device Based on Symmetric Weight Field and Rotation Reconstruction Point

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Embodiment 1

[0051] Such as figure 1 As shown, the method for reconstructing an image based on a symmetrical weight field and a rotating reconstruction point provided in this embodiment includes:

[0052] Step 101: Establishing a discretized geometric model for image reconstruction, including a projection discretization model based on ray tracing and a back projection discretization model based on reconstruction point tracking. Among them: the projection discretization model based on ray tracing refers to the discretization calculation of the projection process corresponding to the projection ray, and the back projection discretization model based on reconstruction point tracking refers to the discretization calculation of the back projection process corresponding to the reconstruction point.

[0053] Specifically, the image space to be reconstructed is represented as f(x, y) in Cartesian coordinates, and as f(x, y) in polar coordinates That is, the rotational reconstruction point mentio...

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Abstract

The invention discloses a fast image reconstruction method and apparatus based on a symmetrical weight field and rotation reconstruction points. The method includes the following steps: establishing an image reconstruction geometry model which includes a projection model based on radiation ray tracking and an anti-projection model which is based on reconstruction point tracking; establishing a weight field of the image reconstruction geometry model, providing a symmetrical structure of the image reconstruction geometry model, in combination with a rotation reconstruction point dispersion model under a scanning mode, summing up forward modeling and back modeling as an interpolation and sampling process on a projection plane; an image reconstructing the symmetrical structure properties of a dispersion geometry model in which the forward modeling and back modeling at different projection angles have the same computing which is simplified to accelerate the reconstruction; based on the symmetrical weight field and rotation reconstruction points, establishing a fast image reconstruction method. According to the invention, by using the method herein, fast reconstruction of computer tomography technology is realized, and high precision images can be reconstructed fast in the fields such as medical CT, work damage-free detection and geological exploration.

Description

technical field [0001] The invention relates to the field of computerized tomography reconstruction and non-destructive testing, in particular to a method and device for rapidly reconstructing an image based on a symmetrical weight field and a rotating reconstruction point. Background technique [0002] Computed tomography (Computerized Tomography, CT) is an important research method and application technology in many scientific and industrial application fields. It is theoretically attributed to the problem of reconstructing the distribution image of object density from projection. There are two basic methods for image reconstruction: analytical algorithms and algebraic iterative algorithms. The analytical algorithm is a closed formula based on Radon transform inversion, which requires complete projection data. The algebraic iterative algorithm transforms the problem of image reconstruction into the problem of solving linear equations, which can deal with the problem of in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T11/00
CPCG06T11/006G06T2211/421
Inventor 邱钧刘畅
Owner BEIJING INFORMATION SCI & TECH UNIV
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