| 摘要 |
An X-ray image correction apparatus has a subtraction processing circuit for subtracting image signals read out from the memories which store X-ray image signals corresponding to X-ray images taken before and after the injection of a contrast medium. An interest area is specified in the part which does not vary readily from the injection of the medium and this interest area is divided into a plurality of sections for each of which a position correction valve is calculated by a position correction valve calculator. The most common correction value of all the sections is used to correct misalignment between the before- and after-injection images.
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