Method for creating attenuation image of measured object based on computer tomography CT and apparatus thereof

A technology of tomographic imaging and measurand, which is applied in computing, computer tomography scanner, echo tomography, etc., can solve the problems affecting the application, lack of universal applicability, difficulty in accuracy of model parameters, etc., and achieve the effect of convenient acquisition

Active Publication Date: 2012-06-13
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] In the existing technical solution, in the process of creating the attenuation map of the measured object based on CT, the determination of the parameters of the linear attenuation coefficient transformation model can use the experimental measurement method, or other non-experimental measuremen...

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  • Method for creating attenuation image of measured object based on computer tomography CT and apparatus thereof
  • Method for creating attenuation image of measured object based on computer tomography CT and apparatus thereof
  • Method for creating attenuation image of measured object based on computer tomography CT and apparatus thereof

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Embodiment Construction

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0032] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, as figure 1 Shown is a schematic flowchart of a method for creating an attenuation map of a measured object based on computed tomography CT provided by an embodiment of the present invention, and the method includes:

[0033] Step 11: Establish a line attenuation coefficient transformation model according to the measu...

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Abstract

The invention discloses a method for creating a attenuation image of a measured object based on computer tomography CT and an apparatus thereof. The method is characterized by: firstly, establishing a line attenuation coefficient transformation model according to the measured object and creating an initial model parameter to describe the line attenuation coefficient transformation model; using the line attenuation coefficient transformation model to carry out transformation to an image element of a CT image of the measured object so as to obtain an initial attenuation image of the measured object and an initial attenuation projection image; according to the initial attenuation projection image and a continuous consistency condition satisfied by the attenuation projection image and the projection image of radioactive drug distribution, correcting an initial model parameter; redescribing the line attenuation coefficient transformation model by using the corrected model parameter so as to obtain a final attenuation image of the measured object. By using the method, the line attenuation coefficient transformation model parameter can be accurately and conveniently obtained. Therefore, the measured object attenuation image based on the CT can be effectively created.

Description

technical field [0001] The invention relates to the technical field of computerized tomography, in particular to a method and device for creating an attenuation map of a measured object based on computerized tomography (CT). Background technique [0002] At present, attenuation maps are generated based on computer tomography (CT) for use in such as radiation therapy planning (which may include nuclear imaging attenuation correction, such as single photon emission tomography (Single Photon Emission Tomography, SPECT), positron Emission tomography (Positron Emission Tomography, PET) system attenuation correction), in CT scanning, X-ray energy is low and the energy spectrum range is wide (for example: 30 ~ 140keV), the main role of its attenuation in the tissue includes Photoelectric effect and Compton scattering; while in nuclear-based imaging, the ray energy is single-energy γ-rays during scanning, for example, the energy of γ-rays during PET scanning is 511keV, and its main ...

Claims

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Application Information

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IPC IPC(8): G06T11/00A61B6/03
Inventor 柴培王璐武丽伟曹学香张玉包单保慈王海鹏李道武李婷曹大全孙翠丽魏存峰魏龙
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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