Patent ID: 8541762
Filing Date: 2013-09-24
Classification: A61N

Abstract:
1. A charged particle irradiation device ( 10 ) for irradiating a target volume ( 50 ), adapted for receiving a treatment plan ( 70 ) defining a series of prescribed irradiation points ( 140 ) having each a prescribed dose to be delivered, comprising an accelerator ( 20 ), a beam transport system ( 30 ) and an irradiation unit ( 40 ) having at least one scanning magnet ( 100 ; 110 ), a dose detector ( 120 ) and at least one beam position monitor ( 130 ) installed in between said scanning magnet ( 100 ; 110 ) and said target volume ( 50 ), a controller ( 80 ) comprising means for calculating for any said prescribed irradiation point corresponding nominal magnetic settings of the scanning magnet such that a beam ( 90 ) is pointing to said prescribed irradiation point when corresponding magnetic settings are applied, and means for calculating a corresponding expected position at said beam position monitor ( 130 ), characterized in that said controller ( 80 ) further comprises: a) means for selecting a tuning reference point from said series of prescribed irradiation points; b) means for specifying a prescribed tuning dose to be given to said selected tuning reference point, said prescribed tuning dose being equal or smaller than said prescribed dose at said selected tuning reference point; c) means for comparing a beam position provided by the beam position monitor ( d) means for computing a first correction to be applied to said nominal magnetic settings of the scanning magnet ( e) means for correcting the nominal magnetic settings of the scanning magnet for all said prescribed irradiation points according to said first correction.