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Development of DosiMap: dosimetry device for radiotherapy quality assurance; Developpement du DosiMap: instrument de dosimetrie pour le controle 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 Cerenkov radiation, and is accurately measured by a C.C.D. 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 Cerenkov 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 C.C.D. detector from scattered radiations. Finally, the dose calibration and  More>>
Authors:
Publication Date:
Oct 15, 2006
Product Type:
Thesis/Dissertation
Report Number:
FRNC-TH-6966
Resource Relation:
Other Information: TH: These constituants elementaires; Also available from Universite de Caen - SCD. Section Sciences, Boulevard du Marechal Juin, Campus 2 - Cote de Nacre, 14032 - Caen Cedex (France)
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; CAMERAS; DOSIMETRY; NUCLEAR MEDICINE; QUALITY CONTROL; RADIATION DOSE DISTRIBUTIONS; RADIOTHERAPY
OSTI ID:
21112682
Research Organizations:
Caen Univ., 14 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR0800206120210
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
205 pages
Announcement Date:
Dec 19, 2008

Citation Formats

Frelin, A M. Development of DosiMap: dosimetry device for radiotherapy quality assurance; Developpement du DosiMap: instrument de dosimetrie pour le controle qualite en radiotherapie. France: N. p., 2006. Web.
Frelin, A M. Development of DosiMap: dosimetry device for radiotherapy quality assurance; Developpement du DosiMap: instrument de dosimetrie pour le controle qualite en radiotherapie. France.
Frelin, A M. 2006. "Development of DosiMap: dosimetry device for radiotherapy quality assurance; Developpement du DosiMap: instrument de dosimetrie pour le controle qualite en radiotherapie." France.
@misc{etde_21112682,
title = {Development of DosiMap: dosimetry device for radiotherapy quality assurance; Developpement du DosiMap: instrument de dosimetrie pour le controle qualite en radiotherapie}
author = {Frelin, A M}
abstractNote = {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 Cerenkov radiation, and is accurately measured by a C.C.D. 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 Cerenkov 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 C.C.D. 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. (author)}
place = {France}
year = {2006}
month = {Oct}
}