08-11-2023 дата публикации
Номер: EP4272814A1
Disclosed herein is a treatment planning method for generating a treatment plan for radiation therapy where a set of targets (18a-18q) are to be treated, the method using a multi-leaf collimator (MLC) (4) for shaping an arc beam (24), a gantry (2) for holding the MLC, the gantry (2) capable of rotating at least partially around a patient, a couch (6) for positioning the patient, the MLC (4) being movable and defining a collimator angle (12), the gantry (2) being movable and defining a gantry angle (10) and the couch (6) optionally being movable thereby defining a couch angle (8), the method comprising the steps of:- Providing (S05) a number of candidate arc paths (20, 20', 20", 22) having an isocenter and a maximum number of arc beams (24) for the treatment plan and, depending on the maximum number of arc beams, a maximum number of target groups (34, 34', 34", 34‴, 34ʺʺ);- Providing (S06) a shape and position of each target (18a-18q) of the set of targets;- Calculating (S08) a target partition (36, 36', 36") out of at least some possible target partitions of the set of targets, the at least some possible target partitions (36, 36', 36") comprising a maximum number of target groups (34, 34', 34", 34‴, 34ʺʺ), each of the at least some possible target partitions (36, 36', 36") comprising target groups (34, 34', 34", 34‴, 34ʺʺ),- Determining (S09) a cost for each target group (34, 34', 34", 34‴, 34ʺʺ) of the possible target partition (36, 36', 36"), taking into account a candidate arc path (20, 20', 20", 22), at least one gantry angle (10) and at least one MLC angle (12) for each target group (34, 34', 34", 34‴, 34ʺʺ) of a possible target partition (36, 36', 36");- Determining (S10) a cost for the possible target partition (36, 36', 36") and current candidate arc path (20, 20', 20", 22) by summing the costs of the target groups (34, 34', 34", 34‴, 34 ...
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