Abstract: An investigative X-ray apparatus comprises a source of X-rays emitting a cone beam centred on a beam axis, a collimator to limit the extent of the beam, and a two-dimensional detector, the apparatus being mounted on a support which is rotatable about a rotation axis, the collimator having a first state in which the collimated beam is directed towards the rotation axis and the second state in which the collimated beam is offset from the rotation axis, the two-dimensional detector being movable accordingly, the beam axis being offset from the rotation axis by a lesser amount than the collimated beam in the second state. The X-ray source is no longer directed towards the isocentre as would normally be the case; the X-ray source is not orthogonal to the collimators. This is advantageous in that the entire field of the X-ray tube can be utilised.

Abstract: A mount for a radiotherapy apparatus may include a cylindrical bearing surface to allow the mount to be supported in a rotateable manner, a housing extending from the bearing surface and having an extent in a direction along an axis of the cylindrical bearing surface, the mount having an axial through-hole which encompasses the axis of the cylindrical bearing surface, the housing having at least one opening communicating with the through-hole and extending in a direction transverse to the axis of the cylindrical bearing surface.

Abstract: A mount for a radiotherapy apparatus comprises a cylindrical bearing surface to allow the mount to be supported in a rotatable manner, a housing extending from the bearing surface and having an extent in a direction along an axis of the cylindrical bearing surface, the mount having an axial through-hole which encompasses the axis of the cylinder, the housing having at least one opening communicating with the through-hole and extending in a direction transverse to the axis of the cylinder. This mount can be used as the basis for a number of different radiotherapy systems.