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System and method for hybrid local tomography image reconstruction

a local tomography and image reconstruction technology, applied in the field of image reconstruction, can solve the problems of reducing dose, complicated situation, and significantly reducing the strength of artifacts

Inactive Publication Date: 2015-05-28
ITOMOGRAPHY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the cone beam setting (e.g., in helical scanning), the situation is more complicated.
However, it was shown by one of the subject inventors that by choosing an appropriate direction of filtering, one can significantly reduce the strength of the artifacts and potentially reduce dose.
A main disadvantage of LT is that LT images look different from conventional CT images, which may result in a loss of diagnostic information.

Method used

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  • System and method for hybrid local tomography image reconstruction
  • System and method for hybrid local tomography image reconstruction

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first embodiment

[0051]FIG. 2 illustrates an image reconstruction in accordance with the prior art LT. For comparison, FIG. 3 illustrates an image reconstruction using the inventive variable filter length LT of the present invention. It is clearly seen that the image in FIG. 3 is much more informative than that illustrated in FIG. 2. In FIG. 3, different tissue types can be easily differentiated and contrast media inside blood vessels is visible.

[0052]As is seen from the description of the methods steps illustrated in FIG. 1, the variable filter length LT algorithm of the first embodiment of the present invention is computationally efficient. It contains steps like filtering, backprojection, multiplication by a weight function, and the like. Most importantly, for each source position, the filtering on the detector is performed along a one-parametric family of curves. In contrast, the algorithms of prior art that reconstruct images from truncated data are generally computationally expensive in view o...

second embodiment

[0061]In accordance with an additional embodiment of the present invention, a system and method for the reconstruction of images having emphasized edges in which the reconstructed image also includes information about the actual values of the distribution of the attenuation coefficient μ inside the object is provided. The present invention proposes an additional embodiment in which a Hybrid Local Tomography (HLT) algorithm provides edge-enhanced reconstruction, while also providing fairly accurate HU values. The main idea of the proposed algorithm of this second embodiment, is the novel combination of a conventional reconstruction with an LT-based reconstruction.

[0062]In an exemplary embodiment of the HLT reconstruction method in accordance with the present invention, let fc(x) denote an image reconstructed by a conventional (i.e., exact or quasi-exact) algorithm. Such an algorithm can be based on, but not limited to, an iterative-based reconstruction algorithm or an FBP-reconstruct...

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Abstract

Methods, processes and systems of image reconstruction utilizing a hybrid local tomography (HLT) methodology for reconstructing internal body images in medical applications, and the like. The system and method of the present invention provides an image with emphasized edges, and the image provides estimations of the attenuation coefficient inside the object being scanned.

Description

STATEMENT OF GOVERNMENT INTEREST[0001]This invention was made with government support under NSF (National Science Foundation) award DMS-0806304, and DMS-1211164. The government has certain rights in this invention.CROSS-REFERENCE TO RELATED APPLICATIONS[0002]This application claims priority to co-pending U.S. patent application Ser. No. 14 / 080,099, entitled “Variable Filter Length Local Tomography”, filed Nov. 14, 2013, which claims priority to U.S. patent application Ser. No. 13 / 722,383, entitled “Variable Filter Length Local Tomography”, filed Dec. 20, 2012, the contents of which are herein incorporated in their entirety.FIELD OF INVENTION[0003]This invention relates to image reconstruction and in particular to methods and systems of Computed Tomography (CT) enhanced image reconstruction using a new Hybrid Local Tomography (HLT) method, which is based on Local Tomography (LT) and conventional tomography techniques for reconstructing internal body images in medical applications, an...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06T11/00G06T5/20G06T5/00A61B6/03A61B6/00
CPCG06T11/005A61B6/032A61B6/4085A61B6/469A61B6/5217G06T5/003G06T2211/421G06T11/006G06T2207/10081G06T2207/20024G06T2207/20192G06T2207/30004G06T2211/424G06T5/20G06T2211/432A61B6/5205A61B6/5211A61B6/5258A61B6/503G16H50/20
Inventor KATSEVICH, ALEXANDERFRENKEL, MICHAEL
Owner ITOMOGRAPHY