Gesellschaft Fuer Schwerionenforschung Mbh

Oliver Jaekel

Gunther Hartmann

Peter Heeg

Christian Karger

A method for the verification of the calculated radiation dose of an ion beam therapy system that comprises a grid scanner device, arranged in a beam guidance system ( ), having vertical deflection means ( ) and horizontal deflection means ( ) for the vertical and horizontal deflection of a treatment beam ( ) perpendicular to its beam direction, with the result that the treatment beam ( ) is deflected by the grid scanner device to an isocentre ( ) of the irradiation site and scans a specific area surrounding the isocentre ( ), irradiation being carried out on the basis of automatically calculated radiation dose data. The accuracy of the calculation of the radiation dose data is verified by using a phantom, a discrepancy between the radiation dose calculated for the at least one measurement point of the phantom and a radiation dose measured for the at least one measurement point being determined and evaluated.

Method for verifying the calculated radiation dose of an ion beam therapy system

A method for operation of an ion beam therapy system that comprises a grid scanner device, arranged in a beam guidance system ( ), having vertical deflection means ( ) and horizontal deflection means ( ) for the vertical and horizontal deflection of a treatment beam ( ) perpendicular to its beam direction, with the result that the treatment beam ( ) is deflected by the grid scanner device to an isocentre ( ) of the irradiation site and scans a specific area surrounding the isocentre ( ) using a specific radiation dose. Both the depth dose distribution and the transverse dose distribution of the grid scanner device ( ) at various positions in the region of the isocentre ( ) are measured and evaluated, it being concluded that the radiation dose distribution is adequately homogeneous if the degree of variation in the radiation dose values measured at the individual positions does not exceed a specific tolerance limit value.

Method for operating an ion beam therapy system by monitoring the distribution of the radiation dose

The present invention relates to a method of checking an isocentre and a patient-positioning device of an ion beam therapy system that comprises a grid scanner device, arranged in a beam guidance system, having vertical deflection means and horizontal deflection means for the vertical and horizontal deflection of a treatment beam perpendicular to its beam direction, with the result that the treatment beam is deflected by the grid scanner device onto an isocentre of the irradiation site, and a specific area surrounding the isocentre is scanned, wherein a check of the isocentre and a patient-positioning device is carried out and the patient-positioning device comprises a patient table rotatable about an axis of rotation of the table. For the checking, a target point within a spherical phantom is represented by means of a special specimen body and the centre point of the specimen body is visibly represented by means of several image-forming methods. On departure of the measurement results in respect of the spatial position of the centre point under the image-forming methods from a predetermined intervention threshold, the ion beam therapy system is subjected to an inspection and/or maintenance.

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Darmstadt, Germany

Oliver Jaekel