Radiant energy – Source with recording detector – Using a stimulable phosphor
Patent
1996-04-19
1997-05-27
Tokar, Michael J.
Radiant energy
Source with recording detector
Using a stimulable phosphor
250583, G01N 2304
Patent
active
056335091
ABSTRACT:
Radiation images of a single object are formed respectively with radiation having different energy distributions, and image signals respectively representing the radiation images are obtained. An unsharp mask signal Lu corresponding to super-low frequency is calculated from one of the image signals or from an image signal, which represents the mean-level image of the radiation images and is calculated from the image signals. The values of parameters for a subtraction process are changed in accordance with the unsharp mask signal Lu. The image signal components of the image signals are subtracted from one another, which image signal components represent corresponding picture elements in the radiation images, with the value of each of the parameters being thus changed for different picture elements in each of the radiation images. The unsharp mask signal Lu represents the median value of the image signal values of all picture elements located within an unsharp mask, which is set in order to obtain the unsharp mask signal Lu.
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Bruce David Vernon
Fuji Photo Film Co. , Ltd.
Tokar Michael J.
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