Patent ID: 9387342
Filing Date: 2016-07-12
CPC Classification: A61N

Claim Text:
1. A method of delivering external radiation beams to a target volume in a body portion, comprising the steps of: positioning one or more radioactive isotope source(s) at a plurality of locations around the body portion; and collimating radiation beams of the one or more radioactive isotope source(s) from the plurality of locations, whereby the target volume in the body portion is deposited with a predetermined dose distribution; wherein the plurality of locations are coplanar and spaced apart substantially evenly along a generally circular orbit surrounding the body portion such that the collimated radiation beams are directed to the target volume from the plurality of the coplanar locations surrounding the body portion along the generally circular orbit and a combined dose deposited to the body portion has a dose distribution with a substantially lower dose at a skin surface of the body portion than in the target volume.