Patent ID: 11964173
Assignee: ELEKTA LIMITED
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 11:
12. A method of adjusting a configuration of a radiotherapy device, the radiotherapy device for delivering radiation to a patient, the device comprising:
a gantry; a source of radiation attached to the gantry and configured to emit radiation along a radiation axis;
a support structure for supporting the gantry; and
a gantry rotation mechanism positioned between the support structure and the gantry,
wherein the gantry rotation mechanism is configured to rotate the gantry about a gantry rotation axis and tilt the gantry with respect to the gantry rotation axis such that the radiation axis is non-perpendicular with the gantry rotation axis, and wherein the gantry rotation mechanism comprises at least a first rotatable wedge and a second rotatable wedge each comprising a rotary actuator;
the method comprising:
tilting the gantry into a first configuration in which the radiation axis is perpendicular with the gantry rotation axis; and
tilting the gantry into a second configuration by effecting relative rotation of the first and second rotatable wedges, in which the radiation axis is non-perpendicular with the gantry rotation axis;
wherein the first rotatable wedge and the second rotatable wedge are offset from one another such that, in both the first configuration and the second configuration, the radiation axis and the gantry rotation axis meet at a same point in space to define an isocentre that is common to both the first configuration and the second configuration, and wherein the offset results in a center of rotation of the second rotatable wedge that does not lie on a rotation axis of the first wedge.