| 摘要 |
A method for the operation of an ion beam therapy system that comprises a grid scanner device, arranged in a beam guidance system (6, 8), having vertical deflection means (13) and horizontal deflection means (14) for the vertical and horizontal deflection of a treatment beam (11) perpendicular to its beam direction, with the result that the treatment beam (11) is deflected by the grid scanner device to an isocentre (10) of the irradiation site and scans a specific area surrounding the isocentre (10). For monitoring the operational stability and operational safety of the therapy system, the beam position of the treatment beam (11) in the region of the isocentre (10) is monitored and evaluated, intervention in the ion beam therapy system being carried out if the evaluation of the beam position shows a departure, from a predetermined desired value, that exceeds a specific tolerance value based on a required half-value width of the beam profile. That tolerance value is especially ±25 % of the required half-value width.
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