X-ray multi-energy spectrum computed tomography (CT) projection data processing and image reconstruction method

A technology for projection data and image reconstruction, which is used in image data processing, 2D image generation, instruments, etc.

Inactive Publication Date: 2013-06-12
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] What the present invention needs to solve is how to suppress the noise and artifacts in the X-ray multi-ene...

Method used

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  • X-ray multi-energy spectrum computed tomography (CT) projection data processing and image reconstruction method
  • X-ray multi-energy spectrum computed tomography (CT) projection data processing and image reconstruction method
  • X-ray multi-energy spectrum computed tomography (CT) projection data processing and image reconstruction method

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Embodiment

[0103] In this embodiment, an X-ray multi-energy spectrum CT is used to scan a chicken wing filled with a contrast agent (iodine solution) in a specific X-ray energy range (25-40keV).

[0104] figure 2To illustrate a projected sinogram of a section of a chicken wing, some vertical linear artifacts appear in the sinogram due to detector defects (bad pixels or dead pixels). Using the method described in step (1) to figure 2 The sinogram in is filtered to suppress the vertical linear artifacts in the sinogram.

[0105] image 3 For the sinogram after correcting the vertical linear artifacts in the embodiment, but there are still some sporadic high-brightness noise scattered in the sinogram, use the method described in step (2) to identify the high-brightness noise in the sinogram and remove These high luminance noise.

[0106] Figure 4 This is the sinogram after correcting the high-brightness noise in the embodiment, and the high-brightness noise in the sinogram is well s...

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Abstract

The invention discloses an X-ray multi-energy spectrum computed tomography (CT) projection data processing and image reconstruction method, which mainly comprises an X-ray energy spectrum CT projection sinogram processing method and a compressed sensing-based accelerated iterative convergent reconstruction algorithm. The X-ray energy spectrum CT projection sinogram processing method mainly comprises the following steps of: (1) restraining vertical streaking artifacts in a projection sinogram; (2) removing high-brightness noisy points in the projection sinogram. The compressed sensing-based accelerated iterative convergent reconstruction algorithm refers to that image total variation (TV) minimization-based optimal constraint conditions and the ordered-subset simultaneous algebraic reconstruction techniques (OS-SART) are combined. As a number of defects still exist in a traditional X-ray energy spectrum CT detection system (X-ray energy resolution photon counting detector), more noise and artifacts exist in acquired projection data. According to the X-ray multi-energy spectrum CT projection data processing and image reconstruction method, X-ray multi-energy spectrum CT projection data are effectively preprocessed by utilizing a preprocessing means, and meanwhile, a TV-based OS-SART algorithm is introduced into X-ray multi-energy spectrum CT image reconstruction, and therefore, image iterative convergence is accelerated, and the noise and the artifacts in a reconstructed image is well restrained.

Description

technical field [0001] The invention belongs to the research field of X-ray multi-energy CT (Computed Tomography) image reconstruction and digital image processing, and relates to an X-ray multi-energy CT (Computed Tomography) projection data processing and image reconstruction method. Background technique [0002] X-ray Computed Tomography (X-CT) technology is to image a section (section) of a three-dimensional object, which can non-destructively detect the density distribution of the section of the object under test, and display it intuitively in the form of an image The internal structure and material composition of the object. Due to its great advantages in material detection, X-CT technology has been widely used in the detection of biomedicine, aerospace equipment, geological and archaeological samples, military weapons, bridge and dam construction, and radioactive pollution. [0003] For a traditional or conventional X-CT system, its X-ray source produces polychromati...

Claims

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Application Information

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IPC IPC(8): G06T11/00
Inventor 何鹏魏彪俞恒永王革冯鹏
Owner CHONGQING UNIV
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