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

Radiation Protection Dosimetry
Claus E AndersenJ Medin

Abstract

Although the radioluminescence (RL) signal from optical fibre Al(2)O(3):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 Al(2)O(3):C can be used for real-time dose rate measurements with a time resolution of approximately 0.1 s and a spatial resolution only limited by the size of the detector (<0.5 mm).

References

Mar 30, 2004·Applied Optics·Brian L JustusRobert W Miller
Jun 10, 2006·Radiation Protection Dosimetry·Carl Johan MarckmannLars Bøtter-Jensen

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Citations

May 22, 2008·Medical Physics·A ViamonteJ E Cygler
Mar 17, 2010·International Journal of Radiation Oncology, Biology, Physics·Louis ArchambaultSam Beddar
Apr 6, 2006·Radiation Protection Dosimetry·Eduardo G Yukihara, Stephen W S McKeever
Sep 19, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·J J SchuytShen V Chong
Apr 14, 2017·Journal of Medical Physics·Y Retna PonmalarHenry Finlay Godson
Sep 30, 2016·Journal of Applied Clinical Medical Physics·Noor MailAbdelhamid Saoudi
Sep 19, 2008·Physics in Medicine and Biology·E G Yukihara, S W S McKeever
May 6, 2017·Physics in Medicine and Biology·Gustavo Kertzscher, Sam Beddar
Mar 3, 2017·Physics in Medicine and Biology·Ivan VeroneseGianfranco Loi
Aug 4, 2021·Radiation Protection Dosimetry·Siyuan ZhangLi Fu

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