| 摘要 |
X-ray pictures cooresponding to the same portion of a suject are stored in first and second imaging plates with the use of an x-ray of different energy. The stored X-ray pictures are converted to corresponding digital picture data and energy subtraction picture data is stored in memory with the use of a predetermined weight coefficient. A profile of a to-be-eliminated image of the picture stored es extracted and a remaining amount of the to-be-eliminated image is determined through comparison between the differentiated values of the profile and a threshold level.
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