Evaluating the dose calculation accuracy of ISOgray radiotherapy treatment planning system for adjacent radiation fields

Document Type : Original Article

Authors

1 Department of Medical Physics and Radiology, Kashan University of Medical Sciences, Kashan, Iran

2 The Advocate Center for Clinical Research, Ayatollah Yasrebi Hospital, Kashan, Iran

Abstract

Adjacent radiation fields are applied in some radiotherapeutic cases. When using these radiation fields, considerable dose errors across the junction of radiation fields are possible. Therefore, it is necessary to evaluate the accuracy of the dose calculated by the treatment planning system (TPS) when using the adjacent radiation fields. The present study aimed to quantify the dose calculation accuracy of ISOgray TPS for the photon-photon adjacent fields. To assess the accuracy of dose calculations, the dose profiles were first measured by a Semiflex TM31010 at 1, 1.5, 5, and 10 cm depths for different field sizes (6 × 6, 10 × 10, and 20 × 20 cm2). In the second step, corresponding data were extracted from the ISOgray TPS. Finally, the dosimetric performance of TPS was evaluated using a gamma index analysis. The overall dose calculation accuracy of ISOgray TPS was within the acceptable range for the build-up region (with acceptance criteria of dose difference (DD) = 15% and distance to agreement (DTA) =3 mm) and the depths after the build-up region (with acceptance criteria of DD = 5% and DTA = 3 mm). Moreover, the overall accuracy of dose calculations was not affected by the field size. A more detailed analysis of the findings revealed that the accuracy of dose calculations in the match line regions of the adjacent radiation fields for 1cm beam profiles was within the acceptable range; however, it declined for other depths. The findings showed that the overall dose calculation accuracy of ISOgray TPS was acceptable for evaluated adjacent radiation fields. However, the accuracy of dose calculations in the match line regions of the adjacent radiation fields for the depth after build-up was not within the acceptable range.

Keywords

References

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