Journal of Medical Physics
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Year : 2022  |  Volume : 47  |  Issue : 3  |  Page : 256-261

Dose agreement analysis of treatment planning system-calculated doses and markus chamber-measured doses in the near-surface region for breast cancer patients' conformal treatment plans

1 Department of Radiation Oncology, Guru Gobind Singh Medical College and Hospital, Faridkot, Punjab, India
2 Department of Radiation Oncology, Government Medical College, Patiala, Punjab, India
3 Department of Radiotherapy, Government Cancer Hospital, MGM Medical College, Indore, Madhya Pradesh, India
4 Advance Cancer Centre, Bhatinda, Punjab, India

Correspondence Address:
Dr. Vinod Kumar Dangwal
Department of Radiation Oncology, Government Medical College, Patiala, Punjab
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jmp.jmp_153_21

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Background: Surface/skin dose measurement is one of the most challenging tasks for clinical dosimetry in radiotherapy and comparison with almost all the commercially available treatment planning systems (TPSs) brings a significant variation with the measured dose. Aims and Objectives: In the current study, doses calculated from the TPS in the near-surface region for conformal plans (both three-dimensional conformal radiotherapy [3DCRT] and intensity-modulated radiotherapy [IMRT]) of 35 breast cancer patients were evaluated and compared with the doses measured with Markus chamber. Materials and Methods: The computed tomography (CT) images of a solid water slab phantom with a Markus chamber (at different depths ranging from 1 mm to 5 mm from the surface) were taken and imported into the TPS. All the conformal treatment plans made in TPS were executed on a linear accelerator and dose agreements between TPS calculated and chamber measured doses were analysed. Results: Results showed that this TPS underestimated the calculated doses in the superficial region by up to 26% and 21%, respectively, with respect to mean and maximum dose values obtained within the effective volume of the chamber used. Conclusion: The uncertainty of doses in the superficial region should be kept in mind when evaluating treatment plans for superficial tumours in TPS.

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