Journal of Medical Physics
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Year : 2010  |  Volume : 35  |  Issue : 4  |  Page : 197-201

Dose-volume histogram quality assurance for linac-based treatment planning systems

1 Tri-State Regional Cancer Center, Medical Physics Section, 706, 23rd Street, Ashland, Kentucky, USA
2 St. Vincent Oncology Center, 8301 Harcourt Road, Indianapolis, Indiana, USA

Correspondence Address:
Michael S Gossman
Tri-State Regional Cancer Center, Medical Physics Section, 706 23rd Street Ashland, Kentucky 41101
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0971-6203.71759

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Dose-volume histograms provide key information to radiation oncologists when they assess the adequacy of a patient treatment plan in radiation therapy. It is important therefore that all clinically relevant data be accurate. In this article we present the first quality assurance routine involving a direct comparison of planning system results with the results obtained from independent hand calculations. Given a known three-dimensional (3-D) structure such as a parallelepiped, a simple beam arrangement, and known physics beam data, a time-efficient and reproducible method for verifying the accuracy of volumetric statistics (DVH) from a radiation therapy treatment planning system (TPS) can be employed rapidly, satisfying the QA requirements for (TPS) commissioning, upgrades, and annual checks. Using this method, the maximum disagreement was only 1.7% for 6 MV and 1.3% for 18 MV photon energies. The average accuracy was within 0.6% for 6 MV and 0.4% for 18 MV for all depth-dose results. A 2% disagreement was observed with the treatment planning system DVH from defined volume comparison to the known structure dimensions.

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