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- Title
AN ALGORITHM FOR REAL-TIME DOSIMETRY IN INTENSITY-MODULATED RADIATION THERAPY USING THE RADIOLUMINESCENCE SIGNAL FROM AL<sub>2</sub>O<sub>3</sub>:C.
- Authors
Anderse, C. E.; Marckmann, C. J.; Aznar, M. C.; B&3x00F8;tter-Jensen, L.; KjæR-Kristoffersen, F.; Medin, J.
- 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 ~0.1 s and a spatial resolution only limited by the size of the detector (<0.5 mm).
- Subjects
LUMINESCENCE; ALGORITHMS; FLUORESCENCE; CHERENKOV radiation; RADIOTHERAPY; OPTICAL fibers; PHOTONS; AFTERGLOW (Physics); LIGHT sources
- Publication
Radiation Protection Dosimetry, 2006, Vol 120, Issue 1-4, p7
- ISSN
0144-8420
- Publication type
Article
- DOI
10. 1093/rpd/nci600 I