| 摘要 |
PURPOSE:To obtain a picture suitable for dynamic analysis by obtaining a periodical peak hold DSA image representing a progress on the way of a contrast medium in flowing and a main peak hold DSA image representing a whole locus of the contrast medium equal to an ordinary peak hold DSA image. CONSTITUTION:In the case of a live image, memories 3, 4 are periodically reset in a fixed period by a controller 5. A peak hold DSA image obtained by subtracting the picture stored in the memories 3, 4 in a subtraction circuit 6 becomes a periodical peak hold DSA image. Namely, in a period 1, the contrast medium does not reach to a photographing section, from a period 2, starts to enter and at a period 6 reaches to an end of the photographing section. The live image indicates the contrast medium at that period. Thereby, since the periodical peak hold DSA image is subtraction image between the peak hold images within the respective periods, it indicates a change in the period and by this periodical peak hold DSA image, a dynamic analysis can be executed.
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