Ct scanning apparatus

A CT machine, comprising:

• a first frame;
• a plurality of supporting devices arranged on the first frame, each said supporting device comprising a plurality of rotating wheels, at least one rotating wheel of at least one supporting device serving as a driving wheel;
• a rotatable portion capable of rotating around a rotation axis when driven by the driving wheel, and the rotatable portion being jointly supported by the plurality of supporting devices during rotation of the rotatable portion;
• a scanning device comprising a ray source and a detector, the ray source and the detector being both arranged on the rotatable portion, and the ray source and the detector being arranged oppositely along a radial direction of the rotatable portion;
• and
• an axial limiting mechanism for limiting movements of the rotatable portion along a first direction and a second direction, the first direction and the second direction being both parallel to the rotation axis, and the first direction being opposite to the second direction,
• wherein the plurality of supporting devices are further configured to limit a movement of the rotatable portion along a first radial direction, the CT machine further comprises a radial limiting mechanism arranged on the first frame, the radial limiting mechanism is configured to limit a movement of the rotatable portion along a second radial direction, the first radial direction and the second radial direction are both parallel to the radial direction of the rotatable portion and opposite to each other.