DYNAMIC RIDGE FILTER AND RANGE SHIFTER AND RADIATION SYSTEM COMPRISING SAME

The present invention concerns a radiation treatment station comprising a dynamic shaping device (30) for shaping a series of pencil beams (Bj). The dynamic shaping device comprises a dynamic ridge filter and a dynamic range shifter. The ridge filter comprises filter rows (10), each composed of a same selection of filter modules (12) of different energy spreading properties distributed along a length of the filter row parallel to the Y-axis. The range shifter comprises shifter rows (20), each composed of a same selection of shifter modules (22) of different range shifting properties distributed along a length of the shifter row parallel to the Y-axis.The filter rows and shifter rows can be translated along the Y-axis independently of one another to yield radiation modules (32) formed by a filter module and a shifter module aligned along a corresponding irradiation axis (Z). By translating the filter rows and shifter rows during scanning of the pencil beams, the dynamic shaping device adapts dynamically to a predefined treatment plan.