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Radiation Protection Dosimetry Advance Access originally published online on April 27, 2006
Radiation Protection Dosimetry 2006 120(1-4):7-13; doi:10.1093/rpd/nci600
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

An algorithm for real-time dosimetry in intensity-modulated radiation therapy using the radioluminescence signal from Al2O3:C

C. E. Andersen1, C. J. Marckmann1, M. C. Aznar1, L. Bøtter-Jensen1, F. Kjær-Kristoffersen2 and J. Medin3

1 Risø National Laboratory, Radiation Research Department, DK-4000 Roskilde, Denmark
2 Copenhagen University Hospital, Department of Radiation Physics, DK-2100 Copenhagen, Denmark
3 Malmö University Hospital, Department of Medical Radiation Physics, SE-205 02, Malmö, Sweden

* Corresponding author: claus.anderson{at}risoe.dk

Although the radioluminescence (RL) signal from optical fibre Al2O3:C dosemeters used in medical applications is essentially proportional to dose rate, the crystals used so far are imperfect in the sense that their RL sensitivity changes with accumulated dose. A computational algorithm has been developed that corrects for these sensitivity changes. We further report on a new system that effectively separates the RL signal generated in the crystal from fluorescence and Cerenkov emission generated in the optical fibre cable using a gating technique in connection with pulsed linear accelerator radiation beams. The dosimetry system has been used for dose measurements in a phantom during an intensity-modulated radiation therapy (IMRT) treatment with 6 MV photons. The RL measurement results are in excellent agreement (i.e. within 1%) with both the OSL results and the dose delivered according to the treatment planning system. RL signals from Al2O3:C can be used for real-time dose rate measurements with a time resolution of ~0.1 s and a spatial resolution only limited by the size of the detector (<0.5 mm).


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 Radiat Prot DosimetryHome page
C. J. Marckmann, C. E. Andersen, M. C. Aznar, and L. Botter-Jensen
Optical fibre dosemeter systems for clinical applications based on radioluminescence and optically stimulated luminescence from Al2O3:C
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 Radiat Prot DosimetryHome page
C. J. Marckmann, M. C. Aznar, C. E. Andersen, and L. Botter-Jensen
Influence of the stem effect on radioluminescence signals from optical fibre Al2O3:C dosemeters
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