Patent ID: 7748902

Claim:
A radiotherapy system comprising: a stationary radiation source that emits a radiation beam towards an isocenter; a skull attachment attachable to a patient's skull; and a coupler attached to said stationary radiation source and to said skull attachment, wherein said coupler is operative to translate said skull attachment and to rotate said skull attachment about first and second rotational axes, wherein said coupler comprises: a first rotation bearing for rotating said skull attachment about a first rotational axis; a second rotation bearing for rotating said skull attachment about a second rotational axis; a skull attachment arm attachable to said skull attachment, whereas said skull attachment arm is translatable relative to said first rotation bearing; a first arm for mounting said first rotation bearing onto, whereas said first arm is translatable relative to said second rotation bearing; and a second arm for mounting said second rotation bearing onto, whereas said second arm is attachable to said stationary radiation source.