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Commissioning of enhanced dynamic wedge on a ROCS RTP system
1Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, USA. liucr@bolus.health.ufl.edu
Summary
Commissioning the enhanced dynamic wedge (EDW) on the ROCS RTPS requires specific data. Accurate jaw positioning is critical, as a 0.5 cm error can lead to a 3.5% output deviation.
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- The enhanced dynamic wedge (EDW) offers an alternative to physical wedges in radiation therapy.
- Clinical implementation requires careful commissioning and data acquisition for accuracy.
Purpose of the Study:
- To describe the clinical commissioning process for the enhanced dynamic wedge (EDW) on a ROCS RTPS.
- To identify key parameters affecting EDW output accuracy.
Main Methods:
- Commissioning involved collecting central axis depth dose, beam profiles, and output factors.
- Monitor unit (MU) calculations utilized scaling factors derived from a normalized golden STT (NGSTT).
- The EDW's unique features, including jaw positioning, were analyzed.
Main Results:
- The EDW commissioning process on ROCS RTPS is similar to standard physical wedges.
- EDW output exhibits sensitivity to field size and jaw positioning.
- A 0.5 cm discrepancy in final moving jaw position can result in a 3.5% output error.
Conclusions:
- The EDW can be successfully commissioned on the ROCS RTPS without altering data file structure.
- Precise setting of the final moving jaw position is crucial for accurate EDW dose delivery.
- This highlights the importance of quality assurance in radiation therapy planning.