Method for determining density distributions and atomic number distributions during radiographic examination methods

A technology of atomic number and density distribution, which can be used in radiodiagnostic instruments, clinical applications of radiodiagnosis, and material analysis using radiation, and can solve problems such as indistinguishability

Inactive Publication Date: 2004-12-01
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Still, he could not, for example, reliably distinguish plastic-encased explosive mixtures from non-explosive plastic directly from X-ray images

Method used

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  • Method for determining density distributions and atomic number distributions during radiographic examination methods
  • Method for determining density distributions and atomic number distributions during radiographic examination methods
  • Method for determining density distributions and atomic number distributions during radiographic examination methods

Examples

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Embodiment Construction

[0041] figure 1 The same absorption line 11 in the diagram 10 connects all value pairs (ρ, Z) to the same attenuation value μ or C in the defined X-ray spectrum. figure 1 The display of shows clearly that information about the type and composition of tissues or substances cannot be deduced from the attenuation values ​​of the X-ray images alone. Typically, radiologists use their anatomical knowledge to identify tissue types in x-ray images and look for exceptions based on that. In order to clarify the character of this exception, the physician is again compelled to use empirical values ​​and morphological criteria. Similarly, material and safety inspection professionals judge the radiological findings based on their professional experience estimates.

[0042] The X-ray beam is attenuated by different substances and with different intensities according to the energy of the X-ray beam. figure 2 This is illustrated by means of the energy dependence 20 of the mass attenuation ...

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Abstract

The invention relates to a method, an X-ray apparatus and a computer software product, which make it possible to determine the distributions of material density and atomic number in objects to be examined of the human or animal type and in objects to be examined that are used in material and safety engineering. The functional dependency of a first X-ray absorption value of density and atomic number is determined in the instance of a first X-ray spectrum, and at least the functional dependency of a second X-ray absorption value of density and atomic number is determined in the instance of a second X-ray spectrum. Based on a recording of a first distribution of X-ray absorption values of the object to be examined in the instance of a first X-ray spectrum, and on a recording of at least one second distribution of X-ray absorption values of the object to be examined in the instance of a second X-ray spectrum, the values for density and atomic number are determined by comparing the functional dependency of a first X-ray absorption value of the first distribution of X-ray absorption values with the functional dependency(ies) of the X-ray absorption values, which are assigned to the first X-ray absorption value, of the second and / or other distributions of X-ray absorption values.

Description

technical field [0001] The invention relates to a method, an X-ray device and a computer software product for obtaining image data about the distribution of physically and chemically important data in a human or animal examination subject. In particular, the present invention relates to the separation of radiological image data into a substance density distribution and an atomic number distribution in an examination object. Background technique [0002] The result of all radiological methods, such as computed tomography, mammography, angiography, X-ray inspection techniques or similar methods, is the attenuation of X-rays along their path from the X-ray source to the X-ray detector. This attenuation is caused by the medium or substance that is transmitted in the ray path. This attenuation is generally defined as the logarithm of the ratio of the attenuated intensity to the original ray intensity, and is called the attenuation coefficient of the substance under the standard ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/00A61B6/03G01N23/04
CPCA61B6/50A61B6/482A61B6/501A61B6/502A61B6/4241A61B6/4035A61B6/508G01N23/04A61B6/505A61B6/583
Inventor 比约恩·海斯曼卡尔·施蒂尔斯托弗
Owner SIEMENS AG
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