Developpement du DosiMap : Instrument de dosimetrie pour le contrôle qualite en radiotherapie

Abstract : This thesis deals with the development of a new dosimetry device for the control of radiotherapy beams. This device is composed of a plane plastic scintillator which is set within a polystyrene phantom. When the DosiMap is irradiated, light is produced. This light is composed of scintillation and Čerenkov radiation, and is accurately measured by a CCD camera. The analysis of the light distribution enables us to deduce the dose distribution in the scintillator plan.
This device has many advantages such as tissue equivalence, a good spatial resolution, and a linear response with regard to energy. It also provides immediate measurements, and as a consequence, it is a very adapted tool for clinical use.
After the introduction about the basic notions of radiotherapy, the different steps of the DosiMap development are exposed in this thesis. In a first time, plastic scintillators have been tested to determine the best one for this application. Then, the deconvolution of scintillation and Čerenkov radiation have been studied, because we only use scintillation to calculate the dose distribution. The camera being in the irradiation room, a lead shield has also been developed to protect the CCD detector from scattered radiations. Finally, the dose calibration and the dose response of DosiMap are exposed.
All this work made feasible the measurement of dose distributions with a precision which turns out to be better than 2% for homogeneous photon beams. Excellent results were also obtained when modulated intensity beams are used.
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Submitted on : Monday, November 20, 2006 - 3:11:52 PM
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  • HAL Id : tel-00115176, version 1

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A.M. Frelin-Labalme. Developpement du DosiMap : Instrument de dosimetrie pour le contrôle qualite en radiotherapie. Physique Nucléaire Théorique [nucl-th]. Université de Caen, 2006. Français. ⟨tel-00115176⟩

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