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CT beam sclerosis correcting method based on original projection sine diagram

A technology of beam hardening correction and sinogram, applied in computerized tomography scanners, echo tomography, etc., can solve problems such as cumbersome correction procedures, changing conditions, and image signal-to-noise ratio decline, and achieve high correction quality and high efficiency Sexuality, simple effect of correction

Inactive Publication Date: 2006-05-24
BEIHANG UNIV
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Problems solved by technology

Under certain conditions, this method can produce a good correction effect on objects composed of a single material, but it has the following defects: (1) The correction procedure is cumbersome, and it needs to be modeled, scanned and calculated separately for different scanning objects; (2) The validity of the correction model depends on the scanning conditions. If the conditions change, the modeling scan and calculation need to be re-executed; (3) The correction model is affected by noise, and the signal-to-noise ratio of the corrected image decreases; (4) The corrected image must be scanned by a single material composition

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  • CT beam sclerosis correcting method based on original projection sine diagram
  • CT beam sclerosis correcting method based on original projection sine diagram
  • CT beam sclerosis correcting method based on original projection sine diagram

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Embodiment Construction

[0059] Such as figure 1 , the specific implementation steps of the present invention are as follows:

[0060] (1) Place the object to be scanned on the rotating inspection table of the third-generation CT scanning system to ensure that the object is covered by the fan beam at any scanning angle;

[0061] (2) Transilluminate the object with the collimated fan-beam rays. At the same time, the detection platform rotates continuously at a constant speed. Ray projection of the object to obtain multiple sets of one-dimensional signals;

[0062] (3) When the inspection table rotates 360 degrees, the detector stops sampling, and the inspection table and the radiation source stop at the same time, that is, a third-generation CT scan is completed;

[0063] (4) Stacking multiple sets of one-dimensional signals obtained in step (2) and arranging them into a matrix to form an original CT projection sinogram. Among them, a column of the matrix represents the data collected by the same de...

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Abstract

The CT beam hardening correction method based on primitive projection sonogram includes the following several steps: (1) making trisubstituted CT scanning, and obtaining primitive projection sonogram arranged into matrix; (2) making dark current and discordance correction of primitive projection sonogram; (3) searching minimum value of every line pixel projection value of primitive projection sonogram; (4) defining a group of positive real number correction coefficient less than 1; (5) subtracting the product of the correspondent line minimum value obtained by step (3) and correspondent line correction coefficient obtained by step (4) from the projection value of every line pixel of projection sonogram and implementing projection beam hardening correction of all the lines; and (6) feeding the corrected projection sonogram into CT reconstructed dynamic library.

Description

technical field [0001] The invention relates to a CT beam hardening correction method, in particular to a CT beam hardening correction method based on an original projected sinogram, and belongs to the CT technical field. Background technique [0002] In the X-ray CT system, the X-ray source emits X-rays, which pass through a certain cross-section of the detected object from different angles, and the detector placed opposite the ray source receives them at corresponding angles, and then attenuates the rays to different degrees according to each angle. , using a certain reconstruction algorithm and computer operations to reconstruct the ray attenuation coefficient distribution mapping image of the detected section of the object, so as to realize the reconstruction of the image by projection and non-destructively reproduce the medium density, composition and structural shape of the object in the section. feature. [0003] The CT reconstruction algorithm assumes that the X-ray...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03
Inventor 傅健路宏年张全红黄琼
Owner BEIHANG UNIV
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