| 摘要 |
<p>[PROBLEMS] To obtain vibration-free precessional moving images. [MEANS FOR SOLVING PROBLEMS] In a precessional operation where an X-ray irradiation means (1) and a two-dimensional radiation detector (2) are moving on a circular or elliptic orbit respectively by rotating either one of holding means, that is a C arm (3) or a holding means (4) at angular rate of a·sin(t) under a steady state condition and by rotating the other holding means at angular rate of b·cos(t), the operation is carried out at angular rate (f(t), g(t)) to ensure that the maximum acceleration is smaller than the steady state acceleration during a running-up period until steady state is reached.</p> |
