Year: 2015
Type: article
Abstract: This results in a Dmin occurring out-of-field at approx. the same depth where Dmax occurs in-field.However at 15cm from the field edge the second build-up region disappears for all detectors.The measured divergent PDDs agree to within 0.5% of each other over the range of out-of-field distances examined.Initial comparison to MC reveal good agreement however the MC PDDs have a large statistical uncertainty.Conclusions: The detectors used in this study show similar response to out-of-field radiation.Concern over the predominance of low energy photons out-of-field causing an over-response in detectors is not evident in this study.The presence of the Dmin could have clinical implications for outof-field dose measurements (e.g.scatter diodes measuring Dmin).Future work will be completed in comparing the measurements and MC to a variety of TPSs to identify the accuracy of different TPSs for out-of-field dose.Also measurements will be repeated for other clinically available detectors and improvements in the statistical uncertainty of the MC dose calculation will be completed.
Source: Radiotherapy and Oncology
Institution: University of Trieste
Language: English
Subfield: Radiation
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,770
OpenAlex ID: W2594376393