| Autor: |
Rowbottom, C. G., Boylan, C. J., Golby, C., Atherton, S., Smith, S., Mackay, R. I. |
| Zdroj: |
World Congress on Medical Physics & Biomedical Engineering, September 7 - 12, 2009, Munich, Germany; 2009, p671-673, 3p |
| Abstrakt: |
The aim of this study was to develop a VMAT solution for prostate patients using a commercially available treatment planning system, Pinnacle. The Pinnacle treatment planning system with DMPO has been used to develop a single arc VMAT solution for prostate patients. The solution involves the optimisation of 15 equi-spaced static beams with 2 control points per beam. The 15 beams are sequenced into an arc of 30 beams, each with a single control point. During this process the ordering of adjacent control points is considered to minimise the motion of the MLC leaves and jaws. In order to accurately model the continous delivery of VMAT, interpolated beams are added between each control point. The resultant step-and-shoot plan is exported to the Mosaiq R&V system and then converted into a VMAT plan for delivery by an Elekta Synergy linac using in-house software. Dosimetric verification has been performed using a film by comparison of the delivered dose distribution to the dose distribution calculated by Pinnacle. The 60 beam plan produced is of comparable quality to the traditional IMRT plan using 5 beams and 30-40 control points in total. The process is able to produce an acceptable plan that is deliverable on the linac using VMAT. Successful verification, >95% pixels passing 3%/3mm gamma evaluation, has been achieved for the prostate patient investigated. In addition, investigation of the linac performance has demonstrated that the dose distribution is consistent over multiple deliveries. It is possible to produce single arc VMAT plans using a standard IMRT treatment planning module. This solution can then be appropriately sequenced into a VMAT treatment plan with acceptable plan quality and verification results. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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