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1. (WO2018137772) SYSTEM AND METHOD FOR PLANNING A RADIATION THERAPY TREATMENT

Pub. No.:    WO/2018/137772    International Application No.:    PCT/EP2017/051748
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Sat Jan 28 00:59:59 CET 2017
IPC: A61N 5/10
Applicants: RAYSEARCH LABORATORIES AB
Inventors: BOKRANTZ, Rasmus
FREDRIKSSON, Albin
Title: SYSTEM AND METHOD FOR PLANNING A RADIATION THERAPY TREATMENT
Abstract:
A system (100) plans a radiation therapy treatment of a target volume based on inputs in the form of: a set of candidate beams (ℬ), where each beam defines an arrangement of a therapeutic beam relative to the target volume; a treatment plan (x) for the radiation therapy treatment that uses a subset of the candidate beams (ℬ); an objective function (F) describing a quality of the treatment plan (x); and a feasible region (x) describing requirements on the treatment plan (x) that must be fulfilled. The objective function (F) and/or the feasible region (X) also reflect a first complexity criterion (r(x) ≤τ) limiting a first complexity measure (τ(χ)) to be less than or equal to a maximum first complexity (f ). An optimization step is executed repeatedly; whereby, in each iteration, an updated treatment plan (χ') is calculated by optimizing the treatment plan (x) with respect to the objective function (F) and the feasible region (X). Here, if a termination criterion is fulfilled, a set of selected beams (r'(x) ≤τ') is calculated based on the updated treatment plan (χ'). The set of selected beams (r(x) ≤τ) is a subset of the set of candidate beam