Patent ID: 7744277

Claim:
An X-ray diagnostic apparatus, comprising: a floor rotating arm provided at one end on a floor surface so as to be rotatable around a substantially vertical first rotation axis, the floor rotating arm being supported by the floor surface only at the one end; a stand supported on the other end of the floor rotating arm so as to be rotatable around a substantially vertical second rotation axis, wherein the vertical height of the floor rotating arm is smaller at the first rotation axis than at the second rotation axis; an arm holder supported on the stand so as to be rotatable around a substantially horizontal third rotation axis; a substantial C-arm supported on the arm holder so as to be slidable/rotatable around a substantially horizontal fourth rotation axis; an X-ray generating unit mounted on one end of the C-arm; an X-ray detecting unit mounted on the other end of the C-arm; and a bed including a table top provided to be movable along a longitudinal axis, wherein a distance between the longitudinal axis and the first rotation axis is equal to a distance between the first rotation axis and the second rotation axis, wherein when a rotational angle of the stand around the second rotation axis and a rotational angle of the arm holder around the third rotation axis, and a rotational angle of the C-arm around the fourth rotation axis are set at a same reference angle, (1) an imaging axis passing through an X-ray focal point of the X-ray generating unit and a detection surface center of the X-ray detecting unit substantially coincides with the first rotation axis, (2) the X-ray generating unit is above the floor rotating arm, and (3) an extension of the imaging axis intersects the C-arm; and wherein the third rotation axis intersects the C-arm, and the C-arm is not substantially displaced away from a plane containing the vertical second rotation axis and the horizontal third rotation axis by a shape of the arm holder.