Method and system for reconstructing an image of an internal region of interest
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: 2017-10-24
SHENZHEN INST OF ADVANCED TECH
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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
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[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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The present invention provides a method and system for reconstructing an image of an internal region of interest, the method comprising: (a) using a CT device to scan the internal region of interest of an object; (b) acquiring the ray projections formed by all the internal regions of interest Projecting an image, and obtaining a noise weight matrix of the projection image; (c) constructing a reconstruction of an internal region of interest image based on the projection image, the noise weight matrix, and a system matrix representing system parameters of the CT device model; (d) obtaining a reconstructed internal ROI image by optimizing and solving the reconstruction model. In the method for reconstructing an image of an internal region of interest according to an exemplary embodiment of the present invention, there is no need for a known region in the internal ROI, the robustness to noisy data is good, and the 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...
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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