Method for analyzing and representing x-ray projection images and x-ray examination unit
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Abstract
The invention relates to a method and an x-ray examination unit for analyzing and representing x-ray projection images with an x-ray examination unit, where the function relation bU=ƒU−1(J˜/J0) is established between the attenuation value and a material-equivalent value as a function of the energy spectrum used, and for the purposes of projection representation, the magnitude of the material-equivalent value bU of a specific material is represented as an image value.
23 Citations
29 Claims
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1-13. -13. (canceled)
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14. A method of analyzing and displaying x-ray projection images using an x-ray examination unit, comprising:
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radiographing an object using x-rays originating from a radiation source and a focus of the radiation source;
measuring the x-rays penetrating the object by a detector field having a plurality of detector elements, the detector field arranged opposite the focus and after the object relative to an x-radiation direction;
determining x-ray attenuation values from local x-ray intensity values captured by the detector field and from initial x-ray intensity values, the initial x-ray intensity values related to the x-rays before penetrating the object;
generating and displaying a projection image of the object based upon the determined x-ray attenuation values; and
determining a functional relationship between the x-ray attenuation values and a material-equivalent coefficient variable relative to an energy spectrum of the x-rays, wherein the material-equivalent coefficient variable is assigned a value characteristic for one specific material and displayed as an image value when displaying the projection image. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An x-ray examination device for generating two-dimensional projection images of a radiographed object, comprising:
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a radiation source having a focus for radiographing an object;
a detector field arranged opposite the focus and after the object relative to an x-radiation direction and having a plurality of detector elements for detecting x-rays penetrating the object;
a display unit; and
a processing unit for determining x-ray attenuation values from local x-ray intensity values captured by the detector field and from initial x-ray intensity values, the initial x-ray intensity values related to the x-rays before penetrating the object and for generating a projection image of the object based upon the determined x-ray attenuation values, wherein the processing unit comprises a calculation unit for determining a functional relationship between the x-ray attenuation values and a material-equivalent coefficient variable relative to an energy spectrum of the x-rays, the material-equivalent coefficient variable is assigned a value characteristic for one specific material, and the projection image is displayed on the display unit based including the value characteristic for the one specific material. - View Dependent Claims (29)
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Specification