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Method and system for reconstructing internal region-of-interest image

A region of interest and image technology, applied in the field of reconstructing internal region of interest images, can solve the problems of inability to fully realize accurate ROI reconstruction, no statistical modeling of data noise, sensitive data with noise, etc., to achieve a wide range of applications, accurate The effect of reconstruction and noise suppression

Active Publication Date: 2015-04-08
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most significant shortcoming of the ART algorithm used in its reconstruction is that it does not statistically model the data noise
If the TV minimization is performed on an image containing noise, it cannot satisfy the condition that the ROI required by this method is a piecewise constant or a piecewise polynomial, and thus cannot fully realize the accurate reconstruction of the ROI.
[0006] Therefore, the existing methods for reconstructing images of internal ROIs have certain limitations. For example, a known region is required in the internal ROI, and clinical applications are limited; or ROIs are required to be piecewise constants or piecewise polynomials. Sensitive to noisy data

Method used

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Embodiment Construction

[0032] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like numerals refer to like parts throughout. The exemplary embodiments are described below in order to explain the present invention by referring to the figures.

[0033] figure 1is a flowchart illustrating a method of reconstructing an internal region of interest (ROI) image according to an embodiment of the present invention. The method can be realized by a computer program, for example, the computer program can run in a CT imaging device or a corresponding image processing device.

[0034] Such as figure 1 As shown, in step S10, a CT device is used to scan the internal ROI of the object. Here, the CT device may be a CT device used in medical and industrial fields, and a system of the CT device may be any CT system, such as a Micro-CT system, a PET\SPE-CT system, and the like. As an example, the scanni...

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Abstract

The invention provides a method and a system for reconstructing an internal region-of-interest image. The method includes: (a), scanning an internal region-of-interest of an object by CT (computed tomography) equipment; (b), acquiring a projection image formed by projection of all rays of the internal region-of-interest, and acquiring a noise weight matrix of the projection image; (c), constructing a reconstruction model related to the internal region-of-interest image according to the projection image, the noise weight matrix and a system matrix expressing CT equipment system parameters; (d), performing optimization solution on the reconstruction model to acquire the reconstructed internal region-of-interest image. According to the method for reconstructing the internal region-of-interest image, existence of a known region in the internal ROI (region-of-interest) is not needed, robustness of data with noise is high, and application range is wider.

Description

technical field [0001] The present invention relates generally to the field of imaging technology. More specifically, it relates to a method and system for reconstructing an image of an internal region of interest. Background technique [0002] In practical engineering applications, due to technology and cost constraints, the size of the detector is limited, and the size of the object to be detected is often too large, so that the scanning field of view (FOV) cannot completely cover the object, and the area to be imaged is generally of interest to us. Both are located inside the object. For example, in dental CT imaging, dentists are often interested in teeth rather than the entire head, so there may be a Region-Of-Interest (ROI) imaging problem. ROI imaging is considered to be an effective method to reduce CT radiation dose. Different from general ROI imaging, the problem of internal ROI imaging is more complicated. FOV only covers ROI, and ROI is completely inside the ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00G06T5/00A61B6/03
Inventor 张蕴婉胡战利梁栋郑海荣
Owner SHENZHEN INST OF ADVANCED TECH
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