Patent ID: 6969194

Claim:
Irradiation device, comprising a gantry; said gantry comprising an inner gantry part and an outer gantry part; a radiation head, mechanically supported by said inner gantry part and rotatable around a rotation axis; said radiation head being arranged to direct radiation to a treatment volume situated substantially on said rotation axis; wherein all movable parts of said gantry are, in all situations, situated at a distance from said rotation axis larger than a predetermined value; said inner gantry part being rotatably supported by said outer gantry part at two support locations, situated on opposite sides of said treatment volume in a direction parallel to said axis; said outer gantry part being stationary with respect to said treatment volume; said radiation head being movable relative to said outer gantry along at least one arc of a circle substantially centered at said treatment volume; said arc being non-parallel with the rotation of said radiation head around said rotation axis, whereby non-coplanar irradiation treatment is achievable.