Relatively parallel line CT region-of-interest image reconstruction method

A region of interest, image reconstruction technology, applied in image generation, image data processing, 2D image generation and other directions, can solve the problems of complex accurate image reconstruction, inability to image reconstruction, data truncation, etc.

Active Publication Date: 2017-02-22
CHONGQING UNIV
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Problems solved by technology

However, in PTCT systems, the detector often only covers a part of the object, which leads to truncated data, which further complicates accurate image reconstruction, and even makes image reconstruction impossible

Method used

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  • Relatively parallel line CT region-of-interest image reconstruction method
  • Relatively parallel line CT region-of-interest image reconstruction method
  • Relatively parallel line CT region-of-interest image reconstruction method

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Embodiment Construction

[0042] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] First review the PTCT model. In PTCT, the target does not move, and the X-ray source and detector move in opposite directions, such as figure 1 shown. Now, take the center of the target as the origin of the Cartesian coordinate system. The ray source trajectory is represented as follows

[0044]

[0045] λ indicates the angle between the ray source and the origin vector on the y-axis, h is the distance from the origin to the X-ray source trajectory, and SDD is the distance from the ray source trajectory to the detector trajectory. ψ is the angle between the ray source trajectory and the x-axis. Under this kind of work, suppose the image function

[0046] Now, a moving coordinate system centered on the ray source point is introduced. In this system, the two unit vectors are as follows

[0047]

[0048] In fact, flat pan...

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Abstract

The invention relates to a relatively parallel line CT region-of-interest image reconstruction method which comprises the following steps: (S1) obtaining projection data; (S2) performing differential back projection of the projection data; and (S3) performing Hilbert inverse transformation of the data obtained by the back projection to obtain a reconstructed image. In the invention, a nearly complete object image can be reconstructed when truncation is not very serious, and a region-of-interest image can be accurately reconstructed by use of a no-truncation artifact in the truncation data collected by a PTCT system. Moreover, the invention also provides a practical weight function to cut down the redundant information generated by a general repeated linear scanning model.

Description

technical field [0001] The invention relates to the field of image reconstruction, in particular to a method for image reconstruction of an area of ​​interest in a relatively parallel straight line CT. Background technique [0002] A new structure of CT system based on parallel movement of X-ray source and detector in different directions (PTCT) was recently proposed and has been shown to have great potential in low-cost CT scanners. However, in order to optimize the PTCT system, the relevant image reconstruction should be studied emphatically. [0003] Previously, for the FBP algorithm under the PTCT system, it mainly dealt with image reconstruction under complete and untruncated data [3]. However, in PTCT systems, the detector often only covers a part of the object, which leads to data truncation, which further complicates accurate image reconstruction, or even makes image reconstruction impossible. Contents of the invention [0004] In view of this, the object of the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
CPCG06T11/006G06T2210/41
Inventor 刘丰林伍伟文王少宇全超
Owner CHONGQING UNIV
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