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Cone beam CT circular-linear track back projection filtering reconstruction method

A back-projection and trajectory technology, applied in the field of CT scanning imaging, to improve image quality and expand the scope of application

Active Publication Date: 2016-12-14
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art, the present invention provides a cone-beam CT circular plus linear trajectory back projection filter reconstruction method, which effectively solves the problem of the cone angle effect in the prior art, and effectively improves the quality of object reconstruction when scanning with a large cone angle

Method used

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  • Cone beam CT circular-linear track back projection filtering reconstruction method
  • Cone beam CT circular-linear track back projection filtering reconstruction method
  • Cone beam CT circular-linear track back projection filtering reconstruction method

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Embodiment 1

[0043] Embodiment one, see figure 1 with 2As shown, a cone-beam CT circle plus straight line trajectory back-projection filter reconstruction method includes the following steps:

[0044] Step 1. According to the working principle of the cone beam CT system, respectively establish the detector coordinate system, and the world coordinate system for the circle plus straight line scanning trajectory and the spatial position of the object to be scanned;

[0045] Step 2. Reconstruct the cylindrical area according to the size of the object to be scanned and the object, and use the formula Determine the length of the shortest straight line segment required for scanning, where H represents the height of the object reconstruction cylinder area, r represents the radius of the object reconstruction cylinder area, and R represents the radius of the circular scanning trajectory;

[0046] Step 3. The object to be scanned is irradiated and projected, and the area to be reconstructed is re...

Embodiment 2

[0049] Embodiment two, see Figure 1-8 As shown, a cone-beam CT circle plus straight line trajectory back-projection filter reconstruction method includes the following content:

[0050] According to the working principle of the cone-beam CT system, the detector coordinate system, and the world coordinate system for the circle plus straight line scanning trajectory and the spatial position of the object to be scanned are respectively established; according to the size of the object to be scanned and the reconstruction cylinder area of ​​the object, the required scanning distance is determined. The length of the shortest straight line segment; the object to be scanned is irradiated and projected, and the area to be reconstructed is reconstructed by the M-line reconstruction method according to the scanning trajectory of the circle plus the straight line trajectory, and the M-line reconstruction result is obtained; the M-line reconstruction result is resampled , to get the final...

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Abstract

The invention relates to a cone beam CT circular-linear track back projection filtering reconstruction method. M-lines are selected according to the imaging geometry characteristics of a circular-linear scanning track; a back projection integral interval is determined by calculating the endpoint coordinates of an R-line passing through the reconstruction points on the M-lines; and object reconstruction is implemented through Hilbert transform. The problem of cone angle effect during big-cone-angle scanning of a single circular track can be solved effectively. A linear scanning track is added on the basis of circular track scanning, so the conditions of perfect reconstruction are satisfied, and complete reconstruction projection data is obtained. The method can be better applied to actual scanning, effectively improves the quality of an image reconstructed at a big cone angle, and is of important practical significance to the expansion of the application range of cone beam CT scanning.

Description

technical field [0001] The invention belongs to the technical field of CT scanning imaging, and particularly relates to a cone-beam CT circle-plus-line trajectory back-projection filter reconstruction method. Background technique [0002] Computed Tomography (CT) technology can obtain the internal three-dimensional structure information of objects without contact and damage, and has been widely used in industrial non-destructive testing and medical imaging diagnosis and other fields. In the CT system, the research of the reconstruction algorithm occupies an extremely important position. Circular trajectory cone beam scanning has the advantages of easy implementation and control in engineering, and has become one of the most widely used scanning methods in practical CT systems; however, circular trajectory scanning cannot meet the conditions for accurate reconstruction, and its reconstruction quality is affected by the cone angle effect , that is, when the cone angle increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
CPCG06T11/006
Inventor 闫镔李增光温建华李磊韩玉席晓琦刘建邦
Owner THE PLA INFORMATION ENG UNIV
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