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TECHNICAL NOTE
Year : 2016  |  Volume : 41  |  Issue : 3  |  Page : 192-197

Comparative study of old and new versions of treatment planning system using dose volume histogram indices of clinical plans


1 Department of Radiotherapy, MNJ Institute of Oncology and Regional Cancer Centre; Department of Physics, Osmania University, Hyderabad, Telangana, India
2 Department of Radiotherapy, MNJ Institute of Oncology and Regional Cancer Centre, Hyderabad, Telangana, India
3 International Cancer Centre, Mahatma Gandhi Memorial Medical Trust, Bhimavaram, Andhra Pradesh, India
4 Department of Physics, Osmania University, Hyderabad, Telangana, India

Correspondence Address:
Gangarapu Sri Krishna
Department of Radiotherapy, MNJ Institute of Oncology and Regional Cancer Centre, Hyderabad - 500 004, Telangana
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0971-6203.189489

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Recently, Eclipse treatment planning system (TPS) version 8.8 was upgraded to the latest version 13.6. It is customary that the vendor gives training on how to upgrade the existing software to the new version. However, the customer is provided less inner details about changes in the new software version. According to manufacturer, accuracy of point dose calculations and irregular treatment planning is better in the new version (13.6) compared to the old version (8.8). Furthermore, the new version uses voxel-based calculations while the earlier version used point dose calculations. Major difference in intensity-modulated radiation therapy (IMRT) plans was observed between the two versions after re-optimization and re-calculations. However, minor difference was observed for IMRT cases after performing only re-calculations. It is recommended TPS quality assurance to be performed after any major upgrade of software. This can be done by performing dose calculation comparisons in TPS. To assess the difference between the versions, 25 clinical cases from the old version were compared keeping all the patient data intact including the monitor units and comparing the differences in dose calculations using dose volume histogram (DVH) analysis. Along with DVH analysis, uniformity index, conformity index, homogeneity index, and dose spillage index were also compared for both versions. The results of comparative study are presented in this paper.


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