Dual-energy CT (Computer Tomography) scan data based detection method for reconstructing projected image

A technology of data reconstruction and CT scanning, which is applied in the field of image analysis and positioning, and can solve the problems of difficult prediction of feasibility and high cost

Inactive Publication Date: 2014-04-16
TIANJIN UNIV
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Problems solved by technology

However, the use of dual-energy CT will bring about problems such as increased costs, and currently dual-energy CT has not been used in the field of radiotherapy
Although ordinary X-ray photography has the characteristics of rea

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  • Dual-energy CT (Computer Tomography) scan data based detection method for reconstructing projected image
  • Dual-energy CT (Computer Tomography) scan data based detection method for reconstructing projected image
  • Dual-energy CT (Computer Tomography) scan data based detection method for reconstructing projected image

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Embodiment Construction

[0029] Based on the physical basis of dual-energy X-ray subtraction technology, this method analyzes the basic principle of selectively erasing a certain material image by using high-energy and low-energy X-rays to double-exposure an object from the perspective of the interaction between matter and X-rays. An image processing method using dual-energy X-ray subtraction technology - logarithmic subtraction method. And according to the physical basis of dual-energy subtraction technology, the theoretical model of the correlation between the gray value of the pixel in the dual-energy subtraction image, the internal properties of the material and the external shooting parameters is further derived.

[0030] Invented the product value of the ray equivalent path length based on CT data (the length of the X-ray passing through the tissue) and the relative electron density of the tissue (the ratio of the electron density of the substance to the electron density of water) as the judgment...

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Abstract

The invention relates to image analysis and positioning and relates to the CT (Computer Tomography) technical field. A dual-energy CT scan data based detection method for reconstructing a projected image aims at obtaining the image so as to be beneficial to the improvement of the positioning accuracy and the tracking accuracy, wherein the image is high in contrast ratio and a certain structure of the image is eliminated selectively. According to the technical scheme, the dual-energy CT scan data based detection method includes that the formula of a dual-energy subtraction angiography image is as follows and parameters and instructions in the formula are as follows. The dual-energy CT scan data based detection method for reconstructing the projected image is mainly applied to CT.

Description

technical field [0001] The invention relates to image analysis and positioning, and relates to a method for generating dual-energy subtraction projection images using computer tomography (Computer Tomography, CT) images. It can be used to detect material thickness, material identification, etc. It can also be used in radiotherapy to predict the location and tracking of treatment targets. Background technique [0002] The quality of CT images plays a very important role in tumor identification, localization, formulation of treatment plan and design of radiotherapy plan. In real-time tracking (or four-dimensional) radiotherapy, the real-time position of the tumor is determined by comparing real-time two-dimensional X-ray images with DRR reconstructed from CT data. Therefore, the quality of DRR images is also important for the accuracy of radiotherapy. Since dual-energy CT can be used to obtain images that selectively remove certain tissues, the introduction of dual-energy CT...

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Application Information

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IPC IPC(8): G06T11/00G06T7/00A61B6/03
Inventor 王学民霍杰撒煜朱险峰宋鹏
Owner TIANJIN UNIV
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