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.
J Med Phys
; 47(3): 256-261, 2022.
Article
en En
| MEDLINE
| ID: mdl-36684697
ABSTRACT
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 andObjectives:
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 andMethods:
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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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
J Med Phys
Año:
2022
Tipo del documento:
Article
País de afiliación:
India