Patent ID: 7349523
Filing Date: 2008-03-25
Classification: A61B,A61N

Abstract:
1. A method of determining an isocenter location of a radiation treatment device, the method comprising: irradiating at least one radiation sensitive media on a three-dimensional phantom having a geometric shape with at least two opposed sides using a first radiation beam location having a first trajectory that passes through the two opposed surfaces at a first entrance position and a first exit position; irradiating the at least one radiation sensitive media using a second radiation beam location having a second trajectory that passes through the two opposed surfaces at a second entrance position and a second exit position; and programmatically determining an intersection between the first trajectory and the second trajectory to estimate an isocenter, wherein the radiation sensitive media comprises a generally planar film, the method further comprising positioning the at least one generally planar radiation sensitive film in or on a support member of a phantom assembly such that the film generally conforms to a shape defined by at least two opposed surfaces of the support member, wherein the first and second beams are configured to provide a beam pattern having plurality of lines with an intersecting location in the film, the method further comprising providing a reference indicia to the at least one film held by the support member to define at least one of a reference orientation, a geometric location identifier or a coordinate system with respect to the support member and film.