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In recent years, the use of PACS for radiation therapy has become the norm inhospital environment and has suggested for collecting data and management fromdifferent TPSs with DICOM objects. However, some TPS does not provide the DVHexportation with text or other format. In addition, plan review systems forvarious TPSs often allow DVH recalculation with different algorithms. Thesealgorithms result in the inevitable discrepancy between the values obtainedwith the recalculation and those obtained with TPS itself. The purpose of thisstudy was to develop a simple method for generating reproducible DVH valuesobtained from the TPSs. Treatment planning information including structures anddelivered dose was exported by the DICOM format from planning systems. Thesupersampling and trilinear interpolation methods were employed to calculateDVH data from 35 treatment plans. The discrepancies between DVHs extracted fromeach TPS and the proposed calculation method were evaluated with respect to thesupersampling ratio. The volume, minimum dose, maximum dose, and mean dose werecompared. The variation of DVHs from multiple TPSs was compared with acommercially available treatment planning comparison tool. The overallcomparisons of the volume, minimum dose, maximum dose, and mean dose showedthat the proposed method generated relatively smaller discrepancies comparedwith TPS than those by MIM software and TPS. As the structure volume decreased,the overall percent difference increased. Most large difference was observed inthe small organs such as eye ball, lens, optic nerve which had below 10 ccvolume. A simple and useful technique was developed to generate DVH withacceptable error from a proprietary TPS. This study provides the convenient andcommon framework which allows to use a single well-managed storage solution forthe independent information system.

A simple DVH generation technique from various radiotherapy treatment planning systems for independent information system