Radiation image-acquiring apparatus, and radiation image-acquiring method

A radiation image-acquiring method performed in a radiation image-acquiring apparatus including X-ray generating means, two-dimensional detecting means adapted to receive X-rays transmitted through a subject to be examined and converting the X-rays into image data, and rotating means adapted to relatively rotate the subject in an image-acquiring area formed by the X-ray generating means and the two-dimensional detecting means, said method comprising:

• a variation detecting step of detecting a predetermined variation of the subject;
• a period calculating step of calculating a period p of the variation detected in the variation detecting step;
• and
• a static-ratio determining step of determining a ratio q of a static time relative to the period p from the variation detected in the variation detecting step,
• wherein a rotation time t for one rotation of the rotating means is calculated based on the period p and the ratio q in a rotation-time calculating step.