| 摘要 |
PURPOSE:To effectively utilize the information obtained by X-ray by providing a means to add video signals of one or more frames from starting to stopping of X-ray irradiation and by logarithm-converting after the addition. CONSTITUTION:By a control program, a switch 26 is connected to side A, X-ray irradiation is started at the starting point of the frame 3 of a frame synchronizing signal (a), and the video signals are stored in an image memory 24. By the next control, the video signals of a frame 4 are added onto the video signals stored in a memory 24 and stored in the memory 24. By the next control, the X-ray irradiation is stopped at the starting point of a frame 5. On the video signals stored in the memory 24, the video signals of the frame 5 are added and stored. Subsequently a switch 26 is set to the side B, and by the next control, the video signals stored in the memory 24 are read, passed through an arithmetic unit 22, logarithm-converted by a logarithm converter 23, and again stored as mask image in the memory 24.
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