Patent ID: 6907105
Filing Date: 2005-06-14
Classification: A61N,G21K

Abstract:
1. A method for determining a set of configurations for a multileaf collimator in a radiotherapy device for production of a desired radiation field, the method comprising: a) varying a parameter of an initial set comprising three or more multileaf collimator configurations to provide a varied set of multileaf collimator configurations; b) determining a calculated radiation field resulting from the varied set of multileaf collimator configurations; c) based upon the calculated radiation field determining whether one or more acceptance criteria are satisfied; d) if the acceptance criteria are satisfied making a further variation to the varied set of multileaf collimator configurations; e) if the acceptance criteria are not satisfied, rejecting a most recent variation to the varied set of multileaf collimator configurations; and, f) repeating (b) through (e) until the varied set of multileaf collimator configurations satisfies one or more termination criteria; wherein each of the multileaf collimator configurations comprises a different rotational angle for the multileaf collimator relative to a direction of a radiation beam to be delivered through the multi-leaf collimator.