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Construction method of filter function for CT (computerized tomography) image tomography reconstruction and tomography reconstruction method

A filter function and CT image technology, applied in the field of image processing, can solve the problems of not being able to meet the needs of special reconstruction effects, not giving CT image design ideas and design directions, and not having universal applicability, etc.

Active Publication Date: 2013-08-21
BEIJING RES CENT OF INTELLIGENT EQUIP FOR AGRI
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Problems solved by technology

[0004] Although as mentioned above, there are many new filter functions with strong pertinence, but they basically do not give a design idea and design direction for the overall situation of the CT image reconstruction process. Generally, only a function is given, or a frequency domain distribution diagram and a spatial domain distribution diagram based on the filter function are given.
Therefore, the existing filter functions are basically modified by directly borrowing the existing R-L filter function and S-L filter function, which cannot meet the needs of some special reconstruction effects; in addition, the existing special filter functions are all aimed at Designed for different actual needs, it is generally an attempt based on personal experience and does not have universal applicability

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  • Construction method of filter function for CT (computerized tomography) image tomography reconstruction and tomography reconstruction method
  • Construction method of filter function for CT (computerized tomography) image tomography reconstruction and tomography reconstruction method
  • Construction method of filter function for CT (computerized tomography) image tomography reconstruction and tomography reconstruction method

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Embodiment 1

[0066] A specific implementation of the technical solution of the present invention in the CT image reconstruction process will be described below with reference to the accompanying drawings.

[0067] (1) First select the basis filter function, and then construct a basis function group by shifting the basis function through the basis function.

[0068] The R-L filter function is selected as the window function here, because the design of the filter function for CT image reconstruction is mainly to design the window function. Of course, the existing window function can also be used, such as the Hanning window function, Hamming window function, Blackman window function, Butterworth Window function, Gaussian window function. The R-L filter function in the frequency domain (that is, the window function W below R-L (ρ)) is expressed as:

[0069] h R-L (ρ)=|ρ|×Rect(ρ),

[0070] in: is a rectangular window function, where N refers to the spatial sampling interval; the rectangul...

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Abstract

The invention particularly relates to a construction method of a filter function for CT (computerized tomography) image tomography reconstruction and a method for carrying out CT image tomography reconstruction by utilizing the construction method, belonging to the technical field of image processing. In order to improve universality of the filter function applied in a CT image reconstruction process and improve image reconstruction quality, according to the technical scheme disclosed by the invention, a new filter function model is constructed by using a base filter function as a base function, a base function group is constructed by adopting a method for translating multiple units of spatial sampling intervals, and the filter function is designed based on concept of weighted average. The filter function designed by the technical scheme disclosed by the invention is a group of Fourier cosine series in a frequency domain and is proved to have universality; and compared with the prior art, the technical scheme disclosed by the invention has the advantage of effectively improving the CT image reconstruction quality.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method for establishing a filter function used in CT (Computed Tomography, computerized tomography) image tomography reconstruction process and a method for performing CT image tomography reconstruction using the method. Background technique [0002] FBP (Filter Back Projection, filter back projection) is a very classic method used in the CT image reconstruction process. Due to its small amount of calculation and fast image reconstruction speed, it has been widely used in various fields of industrial CT image reconstruction. . As a very important stage in the implementation of FBP method, the filtering process is the key to ensure the quality of CT image reconstruction, so it is very important to choose a good filtering function. The currently widely used filter functions include the R-L filter function proposed by Ramachandran.G.N and Lakshminarayanan.A.V in ...

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Application Information

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IPC IPC(8): G06T11/00
Inventor 毕昆王成赵春江侯瑞锋乔晓军
Owner BEIJING RES CENT OF INTELLIGENT EQUIP FOR AGRI
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