X-ray CT imaging apparatus

An X-ray CT imaging apparatus comprising:

• a first supporter for supporting an X-ray generator generating an X-ray cone beam and a two-dimensional X-ray detector, the X-ray generator and the X-ray detector being arranged to interpose an object, the X-ray detector being adapted to generate a data of an image of the object to be processed for calculating a three dimensional CT data of the object;
• a rotary shaft extending vertically for rotating the first supporter around the rotary shaft to revolve the X-ray generator and the X-ray detector around the object;
• a second supporter supporting the rotary shaft;
• a movement mechanism for moving the first supporter relative to the object;
• and
• a plane movement mechanism for moving the rotary shaft relative to the object in the movement mechanism;
• wherein in an offset scan CT imaging the revolution of the first supporter around the rotary shaft is performed at the same time as a relative two-dimensional movement of the rotary shaft by the plane movement mechanism;
• and
• wherein in the relative two-dimensional movement of the rotary shaft, a position of the rotary shaft is moved according to a rotary angle of the first supporter in two dimensions in a plane crossing the rotary shaft along a circular orbit around a center of a CT imaging region, the rotary angle of the first supporter being 360 degrees or more.