Radiographic image processing method and photographic imaging apparatus therefor
First Claim
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1. A radiographic image processing method, comprising steps of:
- obtaining information relating to transmission images which are obtained by radiating radiations having more than two different energy levels onto a subject in the same direction,preparing a logarithmic image through a logarithmic transformation of the transmission image obtained by use of a radiation of an energy level, and another logarithmic image through a logarithmic transformation of another transmission image obtained by use of a radiation of another energy level, andobtaining an image contrast ratio of the logarithmic images at a specific part of the subject by use of said logarithmic images.
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Abstract
Transmission images are obtained by radiating X-rays having two different energy levels onto a subject in one direction, and then transformed into logarithmic images, respectively. From these logarithmic images, a contrast ratio due to the two kinds of X-rays having different energies is obtained. From this contrast ratio, the term relating to the thickness of the subject is eliminated, thereby providing information only relating to the quality of the material. By collating the information with the previously measured data of materials, the material of the subject is identified.
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Citations
22 Claims
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1. A radiographic image processing method, comprising steps of:
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obtaining information relating to transmission images which are obtained by radiating radiations having more than two different energy levels onto a subject in the same direction, preparing a logarithmic image through a logarithmic transformation of the transmission image obtained by use of a radiation of an energy level, and another logarithmic image through a logarithmic transformation of another transmission image obtained by use of a radiation of another energy level, and obtaining an image contrast ratio of the logarithmic images at a specific part of the subject by use of said logarithmic images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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- 17. A radiographic imaging apparatus for radiographic images including radiation sources, detecting means for detecting radiation, image processing means, indicating means, and means for determining the image contrast ratio of a subject based on logarithmic images transformed from the transmission images which are obtained by use of radioactive rays having different energy levels.
Specification