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Simple technique to visualize random set-up displacements using a commercially available radiotherapy planning
Hiromichi Ishiyama1, Masashi Kitano, Yuzuru Niibe
1Department of Radiology, Kitasato University School of Medicine, Kanagawa 228-8555, Japan.
Radiation Medicine
|June 9, 2005
Summary
This study presents a simple radiotherapy planning system (RTP) technique to visualize random set-up displacements in isodose distributions. The method effectively reflects displacement impacts, showing larger standard deviations dull dose distribution edges.
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- Accurate patient positioning is crucial in radiotherapy.
- Set-up displacements can significantly alter radiation dose distributions.
- Visualizing the impact of these displacements is essential for treatment planning.
Purpose of the Study:
- To introduce a straightforward method for visualizing random set-up displacements in isodose distribution images.
- To assess the effectiveness of this technique using a commercial radiotherapy planning system (RTP).
Main Methods:
- Modeled set-up displacements using a Gaussian distribution.
- Planned 41 misaligned beams with weights based on the Gaussian distribution.
- Visualized modified isodose distributions using an RTP system.
- Compared distributions using 41 beams with those using two beams (one standard deviation).
Main Results:
- Modified isodose distributions exhibited a duller edge compared to normal distributions.
- Increased standard deviation of set-up displacement led to a duller dose distribution edge.
- Isodose distributions generated using two beams were visually similar to those from 41 beams.
Conclusions:
- The proposed technique effectively visualizes the impact of random set-up displacements on isodose distributions.
- This method provides a practical approach for assessing positioning uncertainties in radiotherapy planning.