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CT three-dimensional reconstructing method and system

A technology of three-dimensional reconstruction and three-dimensional volume, applied in the field of image processing, can solve the problems of poor reconstructed image quality, limited application, low calculation efficiency, etc., and achieve the effect of ensuring quality

Active Publication Date: 2017-06-13
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing 3D reconstruction based on the FDK algorithm, the FDK algorithm is used as a filter back projection accumulation algorithm. Although the calculation speed is fast and the system resource requirements are low, the quality of the reconstructed image is poor, and there are artifacts, which affect the visualization effect and doctor's diagnosis.
Although the algebraic iterative algorithm ART can solve the image quality problem of the filtered back projection algorithm, the algorithm needs to calculate the projection matrix, which requires a large amount of calculation and low calculation efficiency. When saving the projection matrix, the storage hardware requirements are also high. its clinical application

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  • CT three-dimensional reconstructing method and system

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Embodiment 1

[0065] figure 1 It is a flow chart of a CT three-dimensional reconstruction method provided by Embodiment 1 of the present invention. This embodiment is applicable to the situation of performing three-dimensional reconstruction under a cone-beam CT model. This method can be executed by a CT three-dimensional reconstruction system, which can be performed by Realized by software and / or hardware, the system can be integrated in devices such as computers, and the method specifically includes the following steps:

[0066] S110. Send the two-dimensional projection images acquired by the CT under at least two rotation angles to at least two lower computers.

[0067] Among them, CT is the electronic computer tomography technology, which can be divided into traditional CT, spiral CT and cone beam CT. And hundreds of tomographic scans of spiral CT, and its resolution in X, Y, and Z directions is consistent, which can significantly reduce the common volume effect in traditional CT and s...

Embodiment 2

[0080] Figure 4 It is a flow chart of a CT three-dimensional reconstruction method provided by the second embodiment of the present invention. The embodiment of the present invention is optimized on the basis of the above-mentioned embodiment, and the two-dimensional The projection matrix of each pixel in the projected image" has been further refined, and the method includes:

[0081] S410. Send the two-dimensional projection images acquired by the CT under at least two rotation angles to at least two lower computers.

[0082] S420. Control each of the lower computers to construct a connection equation between the X light source and each pixel in the two-dimensional projection image according to the rotation angle corresponding to the received two-dimensional projection image.

[0083] S430. Control each of the lower computers to determine whether the connection equation of each pixel intersects with each voxel in the three-dimensional volume data to be reconstructed; if yes...

Embodiment 3

[0095] Figure 5 It is a flow chart of a CT three-dimensional reconstruction method provided by the third embodiment of the present invention. The embodiment of the present invention is optimized on the basis of the above-mentioned embodiments, for "controlling each of the lower computers according to the projection matrix, and to be Reconstructing the current iterative state of the three-dimensional volume data, calculating the iterative attenuation component corresponding to each of the two-dimensional projection images and returning to "has been further refined, the method includes:

[0096] S510. Send the two-dimensional projection images obtained by the CT under at least two rotation angles to at least two lower computers.

[0097] S520. Control each of the lower computers to calculate the projection matrix of each pixel in the received two-dimensional projection image, and store the calculation result in the memory of each of the lower computers.

[0098] S530. Control ...

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Abstract

The embodiment of the invention discloses a CT three-dimensional reconstructing method and system. The method comprises the steps of sending two-dimensional projection images obtained by CT at at least two rotation angles to at least two lower computers; controlling projection matrixes of all pixel points in the two-dimensional projection images received by all the lower computers through calculation, and storing the calculation result into memories of all the lower computers; according to the projection matrixes and the current iteration state of three-dimensional body data to be reconstructed, controlling all the lower computers to calculate an iterative attenuation weight and returning; according to the iterative attenuation weight, updating the current iteration state; returning to execute control over the projection matrixes and the current iteration state which are stored in the memories of all the lower computer, and calculating an iterative attenuation weight and returning till a preset ending condition is met; adopting a current iteration state after iteration ends as a three-dimensional representing result of a CT. By utilizing multiple lower computers to conduct distributed parallel calculation, the problems of low calculating efficiency, low reuse performance of calculating result and the like are overcome, and the three-dimensional reconstructing image quality is guaranteed.

Description

technical field [0001] Embodiments of the present invention relate to image processing technologies, and in particular to a CT three-dimensional reconstruction method and system. Background technique [0002] Compared with the traditional CT technology, because of the higher image resolution and larger field angle of the flat-panel detector, the cone-beam CT with the flat-panel detector technology has advantages in both imaging quality and imaging efficiency. Fast and accurate CT three-dimensional reconstruction under the cone-beam CT model has become a very important issue. [0003] The existing 3D reconstruction based on the FDK algorithm, the FDK algorithm is used as a filter back projection accumulation algorithm. Although the calculation speed is fast and the system resource requirements are low, the quality of the reconstructed image is poor, and there are artifacts, which affect the visualization effect and doctor's diagnosis. Although the algebraic iterative algorit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/00
CPCG06T17/00
Inventor 陈垦王澄秦文健熊璟谢耀钦
Owner SHENZHEN INST OF ADVANCED TECH
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