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Multi-institutional dose audit in radiotherapy facilities using in-house developed optically stimulated luminescence disc dosimeters


1 Department of Physics, National Institute of Technology, Raipur, Chhattisgarh; Directorate of Regulatory Inspection, Atomic Energy Regulatory Board, Mumbai, India
2 Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai; Homi Bhabha National Institute, Mumbai, India
3 Department of Radiation Oncology, Apollo Hospitals, Navi Mumbai, Maharashtra, India
4 Department of Radiotherapy, Pt. J.N.M.Medical College and Hospital, Raipur, Chhattisgarh, India
5 Directorate of Regulatory Inspection, Atomic Energy Regulatory Board, Mumbai, India
6 Department of Physics, National Institute of Technology, Raipur, Chhattisgarh, India

Correspondence Address:
Sadhana Agrawal,
Department of Physics, National Institute of Technology, G.E. Road, Raipur - 492 010, Chhattisgarh
India
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jcrt.jcrt_753_21

Aim: The aim of this study was to carried out the audit of radiotherapy centers practicing conformal radiotherapy techniques and demonstrate the suitability of this indigenous optically stimulated luminescence (OSL) disc dosimeters in beam quality audit and verification of patient-specific dosimetry in conventional and conformal treatments in radiotherapy. Materials and Methods: Dose audit in conventional and conformal (intensity-modulated radiotherapy and volumetric-modulated arc therapy) radiotherapy techniques was conducted using in-house developed Al2O3:C-based OSL disc dosimeter and commercially available Gafchromic EBT3 film in 6 MV (flat and unflat) photon and 6 and 15 MeV electron beams. OSL disc dosimeter and Gafchromic EBT3 film measured dose values were verified using the ionization chamber measurements. Results: Percentage variations of doses measured by OSL disc dosimeters and EBT3 Gafchromic film for conventional radiotherapy technique were in the range of 0.15%–4.6% and 0.40%–5.45%, respectively, with respect to the treatment planning system calculated dose values. For conformal radiotherapy techniques, the percentage variations of OSL disc and EBT3 film measured doses were in the range of 0.1%–4.9% and 0.3%–5.0%, respectively. Conclusion: The results of this study supported by statistical evidence provided the confidence that indigenously developed Al2O3:C-based OSL disc dosimeters are suitable for dose audit in conventional and advanced radiotherapy techniques.


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