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Treatment planning for enhanced dynamic wedge with the CMS focus/Modulex treatment planning system
1Mallinkrodt Institute of Radiology, Radiation Oncology Center, St. Louis, MO 63110, USA.
Summary
This study presents a workable method for generating dynamic wedge filters for radiation therapy planning systems. The new approach uses segmented treatment tables to create filters, achieving accurate isodose angles and acceptable dose calculations.
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- Current CMS treatment planning systems (FOCUS, Modulex) model dynamic wedges as filters.
- Previous methods involved back-projecting filters from measured data.
Purpose of the Study:
- To describe methods for generating dynamic wedge filters for treatment planning.
- To evaluate the accuracy of filters created using the segmented treatment table (STT) method.
Main Methods:
- Utilized the segmented treatment table (STT) to generate dynamic wedge filters.
- Created 30 cm filters for each wedge angle, with field truncation by blocks based on dynamic jaw settings.
Main Results:
- Generated filters produced isodose angles within 2 degrees of measured angles.
- Central axis dose was within 1%, though beam hardening was not accounted for.
Conclusions:
- The filter method, while not ideal, is a workable solution for modeling dynamic wedging in treatment planning.
- This approach offers a practical way to implement dynamic wedges using STT data.