Patent ID: 8898038
Filing Date: 2014-11-25
Classification: A61N

Abstract:
1. A method for determining a beam parameter of an unflattened photon beam generated by an accelerator, the method comprising: measuring radiation dose values of the unflattened photon beam in a plane perpendicular to a beam propagation direction; rescaling, by a computer unit, the measured radiation dose values based on a definition of a beam extension of a flattened beam, the beam extension of the flattened beam extending in a direction perpendicular to the beam propagation direction and corresponding to a field size of the flattened beam, the rescaling comprising setting the measured radiation dose values such that a same value is obtained for the extension of the unflattened photon beam as would be obtained if the beam was flattened; and determining the beam parameter of the unflattened photon beam using a beam parameter definition of the flattened beam based on the rescaling.