Patent ID: 7648272

Claim:
An X-ray diagnostic apparatus comprising: a floor rotating arm, one end of the floor rotating arm being mounted on a floor surface so as to be rotatable around a substantially vertical first rotation axis; a stand mounted on the other end of the floor rotating arm so as to be rotatable around a substantially vertical second rotation axis; an arm holder mounted on the stand so as to be rotatable around a substantially horizontal third rotation axis; a substantially C-shaped, C-arm mounted on the arm holder so as to be slidable around a substantially horizontal fourth rotation axis, with an isocenter at which the fourth rotation axis intersects the third rotation axis being located on the first rotation axis when the C-arm is located above the floor rotating arm; a first X-ray generating unit mounted on one end of the C-arm; a first X-ray detecting unit mounted on the other end of the C-arm; and an Ω-arm having a second X-ray generating unit and a second X-ray detecting unit mounted on the two ends of the Ω-arm, the Ω-arm arranged such that the C-arm can be moved into a position so that a first imaging axis of the first X-ray generating unit intersects with a second imaging axis of the second X-ray generating unit, wherein when (a) the C-arm is arranged in a vertical position, (b) a rotational angle of the second rotation axis is at a reference position set such that the C-arm is arranged in parallel with the floor rotating arm, and (c) the first imaging axis is substantially vertical, then the C-arm is aligned with the floor rotating arm and the C-arm is provided in a zero offset state such that the C-arm is located immediately above the floor rotating arm so as to overlap the floor rotating arm and a central line of the C-arm coincides with the first rotation axis and the first imaging axis, and wherein the first X-ray detecting unit is arranged on the other end of the C-arm so as to be rotatable around the first imaging axis of the first X-ray generating unit.