Abstract # 2889 Clinical Test Of A Beam Delivery System For Protontherapy Treatments

Presenter: Adelaide, Garella

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The beam monitors have been tested on the clinical beam line of I.Curie-CPO and at CATANA facility : the response of the chambers has been analyzed , in terms of the constancy as a function of the delivered dose, stability in time, and accuracy of the beam position measurements.
The constancy of the chambers response is better than 1%. The position of centre of gravity of the beam can be measured with an accurancy of 100 micron by strip chambers, and 200 micron by pixel chamber.
The use of strip detectors allows the measurements of relevant parameters during treatment such as integrated fluence, centre of gravity, width and asymmetry .
The pixel chamber allows a 2D diagnostic of the beam, supplying shape, position and fluence of the beam during the treatment.
In the tests carried out at Catana the strip detector has been used under different beam conditions. The parameters for beam diagnostic, are obtained with a resolution of about 100 micron at a rate of about 1 kHz, with no dead time. Results will be given for shapes and integrated fluence, together with a comparison with that obtained with other reference detectors.
At I.Curie-CPO, the pixel chamber prototype has been used every day to check the quality of the beam.
The measures done with this detector, like background currents, stability of the detector readout and gain uniformity will be shown.

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Pixel chamber : the reproducibility:

Pixel chamber : the gain uniformity:

The pixel chamber : the linearity:

The pixel chamber as on-line monitor:

Strip chamber : beam fluence:

Strip chamber : beam simmetry:

Strip chamber : beam simmetry:

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