Patent ID: 8546773
Filing Date: 2013-10-01
Classification: A61N

Abstract:
1. A method of radiotherapy, comprising: activating a radiation source having a radiation path that intersects a treatment area; moving the radiation source in three dimensions about the treatment area, wherein the radiation source is continually directed substantially toward an isocentric point within the treatment area; moving the radiation source in a first substantially arched path about a first rotational axis passing through the isocentric point such that a radiation path of the radiation source continues to be directed substantially toward the isocentric point; and moving the radiation source in a second substantially arched path about a second rotational axis passing through the isocentric point and substantially normal to the first rotational axis such that a radiation path of the radiation source continues to be directed substantially toward the isocentric point; wherein the rate of movement of the radiation source along the second substantially arched path about the second rotational axis is about: wherein theta (θ) comprises an angle of the location of the radiation source on the second substantially arched path relative to the first rotational axis, wherein phi (φ) is equal to a complementary angle of θ (90−θ), and wherein S is a speed of the radiation source at the given location where the angle is θ or φ, respectively.