| 摘要 |
PROBLEM TO BE SOLVED: To provide an X-ray photographing apparatus which can determine a modulus depending on the body thickness of a subject to suppress a subtraction error in a dual energy subtraction image. SOLUTION: The X-ray photographing apparatus processes a weight-allocated log subtraction for collected high-voltage image and low-voltage image by using two kinds of weight moduli as a high-voltage image modulus and a low-voltage image modulus. These weight moduli can be determined depending on the body thickness of a subject M through a console 41 to process appropriately the weight-allocated log subtraction, thereby suppressing a subtraction error in the dual energy subtraction image. COPYRIGHT: (C)2007,JPO&INPIT
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