| 摘要 |
PROBLEM TO BE SOLVED: To provide radiographic apparatus capable of appropriately acquiring a subtraction image. SOLUTION: An adder finds an addition image L<SB>add</SB>by finding an additional value based on two long-sized low-pressure images L<SB>1</SB>and L<SB>2</SB>of the same low pressure in the positioned state, and performs the subtraction process, the weighting log subtraction, by multiplying the logarithm of a long-sized high-pressure image H and the logarithm of the addition image L<SB>add</SB>, the additional value of the long-sized low-pressure image by a weighting coefficient respectively. The subtraction image can be appropriately obtained by obtaining a long-sized subtraction image B by means of the subtraction process for the addition image L<SB>add</SB>, the additional value of the long-sized high-pressure image H and the long-sized low-pressure image. COPYRIGHT: (C)2009,JPO&INPIT
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