3D analysis and analog method for CT projection data

A technology of projection data and simulation methods, applied in image data processing, instruments, 2D image generation, etc., can solve the problems of slow calculation speed, introduction of discretization noise, increase of calculation time, etc., to achieve the effect of fast calculation speed

Active Publication Date: 2008-12-31
TSINGHUA UNIV +1
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  • Claims
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Problems solved by technology

However, the numerical simulation method has two shortcomings: 1) the calculation speed is slow; 2) the discretization noise is introduced in the projection process
The way to reduce discretization noise is to reduce the pixel size, but this will lead to a cubic increase in calculation time

Method used

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  • 3D analysis and analog method for CT projection data
  • 3D analysis and analog method for CT projection data
  • 3D analysis and analog method for CT projection data

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Embodiment Construction

[0040] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0041] When the present invention is implemented, it includes steps: 1) determine the model definition method; 2) determine the scan mode definition method; 3) set the analytical simulation program in the computer; 4) generate CT by step 1), step 2), and step 3) projection data p jk .

[0042] Such as figure 2 As shown, an exemplary embodiment of the present invention includes a computer interface and a method for processing user input by a parsing simulation program. Two coordinate systems are used in the embodiment: the system coordinate system and the geometry local coordinate system. The center of the model is located at the origin of the system coordinate system, and the positions of the ray source and the detector are defined in the system coordinate system. The center of the geometry is located at the origin of the local co...

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Abstract

The invention relates to a method for CT projection image reconstruction. A three-dimensional analytical simulation method for CT projection data disclosed by the present invention includes: 1) determining a model definition method; 2) determining a scanning mode definition method; 3) setting an analytical simulation program in a computer; 4) by 1), 2), and 3) Generate CT projection data p jk . Since the present invention can be used to change the model definition and scan parameter definition in an interactive manner, various models and scan parameters can be defined as required without rewriting the simulation projection program, thereby obtaining analytical simulation projection data conveniently and quickly .

Description

technical field [0001] The invention relates to a method for CT projection image reconstruction, in particular to a simulation method for CT projection image reconstruction. Background technique [0002] CT technology is widely used in the fields of industrial non-destructive testing (NDT), medical diagnosis and scientific research. CT projection data must be used in the research process of CT reconstruction algorithm. [0003] There are two sources of CT projection data: 1) collected from an actual CT system; 2) generated by computer simulation. [0004] Due to the high cost of actual CT systems, most research institutions do not have actual CT systems. In addition, in order to study the performance of the reconstruction algorithm, the projection data of a specific model is required. When collecting the projection data in the actual CT system, the corresponding model must be customized, which is very expensive, and due to the constraints of actual manufacturing capacity, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T11/00
Inventor 康克军张丽陈志强邢宇翔唐杰程建平李元景
Owner TSINGHUA UNIV
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