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

C.E. Andersen, C.J. Marckmann, Marianne Aznar, L. Bøtter-Jensen, F. Kjær-Kristoffersen, J. Medin

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    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 similar to 0.1 s and a spatial resolution only limited by the size of the detector (< 0.5 mm).
    Original languageEnglish
    JournalRadiation Protection Dosimetry
    Volume120
    Issue number1-4
    Pages (from-to)7-13
    ISSN0144-8420
    DOIs
    Publication statusPublished - 2006

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