Ce-doped SiO2 optical fibres for real-time dosimetry of external radiotherapy beams
Contributo in Atti di convegno
Data di Pubblicazione:
2010
Citazione:
Ce-doped SiO2 optical fibres for real-time dosimetry of external radiotherapy beams / I. Veronese, M.C. Cantone, N. Chiodini, A. Coray, M. Fasoli, A. Lomax, E. Mones, F. Moretti, M. Petrovich, A. Vedda - In: Third European IRPA congress : proceedings : 14
–18 June 2010, Helsinki, Finland[s.l] : STUK, 2010. - ISBN 978-952-478-551-8. - pp. S04-06.699-S04-06.707 (( Intervento presentato al 3. convegno European IRPA congress tenutosi a Helsinki, Finland nel 2010.
Abstract:
The introduction of new technologies in ra
diation therapy aimed at improving the dose
distribution to the tumour volume, calls for
the development of innovative devices able
to assure the quality of radiation beams a
nd in-vivo real time dosimetry measurements.
This work describes the use of a novel glass composite fibre dosimeter for the
characterization of different t
ypes of radiotherapy beams.
The dosimeter is based on the
radioluminescence emission of a small portion of SiO
2
fibre doped with cerium
prepared by means of the sol gel and powde
r in tube techniques. The doped portion is
connected by fusion splicing to a commercial optical fibre which is optically coupled to
a photomultiplier tube operating in photon counting mode. The signal is processed by a
circuitry and software properl
y designed. In order to subt
ract the Cerenko
v contribution
to the signal response a double optic
al fibre geometry is adopted.
The system was tested by using conven
tional radiotherapy
photon and electron
beams, as well as stereotactic fields gene
rated by a 6 MV linear
accelerator equipped
with cone stereotactic collim
ators. Characterisation measur
ements were also performed
using 138 MeV proton pencil beams at the Ce
nter for Proton Therapy of the Paul
Scherrer Institute (PSI), using the discrete spot scanning technique.
The system showed interesting dosimetr
ic properties in terms of sensitivity,
reproducibility, linearity, energy and angul
ar dependence. Moreover, the small
dimension of the fibre and the possibility to
perform real time measurements of the dose
rate, proved to be particularly useful for a
reliable evaluation of the output factors of
small stereotactic fields and for resolving
different scanning seque
nces of proton pencil
beams.
Tipologia IRIS:
03 - Contributo in volume
Elenco autori:
I. Veronese, M.C. Cantone, N. Chiodini, A. Coray, M. Fasoli, A. Lomax, E. Mones, F. Moretti, M. Petrovich, A. Vedda
Link alla scheda completa:
Titolo del libro:
Third European IRPA congress : proceedings : 14
–18 June 2010, Helsinki, Finland
–18 June 2010, Helsinki, Finland