| CPC A61N 5/1081 (2013.01) [A61N 5/1048 (2013.01)] | 18 Claims |

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1. A radiotherapy apparatus comprising:
a gantry rotatable about a gantry rotation axis; and
a plurality of rotatable rollers positioned underneath the gantry and configured to support the gantry, wherein a first rotatable roller of the plurality of rotatable rollers is configured to rotate about a first axle, wherein the first axle is configured to rotate about a first axle rotation axis, and wherein the first axle is configured such that rotation of the first axle about the first axle rotation axis displaces the first rotatable roller in a direction substantially perpendicular to the gantry rotation axis.
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