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[The field shape optimization in conformal radiation therapy by MLC rotation]
Binbing Wang1, Zhiquan Tang, Qing Hou
1Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China.
Summary
Rotating multi-leaf collimator (MLC) fields improves conformal radiation therapy. This method enhances target uniformity and reduces radiation dose errors, eliminating cold and hot spots for better treatment.
Area of Science:
- Radiation Oncology
- Medical Physics
Context:
- Conformal radiation therapy (CRT) is a standard cancer treatment.
- Multi-leaf collimators (MLCs) are used in CRT but have limitations.
- MLC leaf edges can cause dose inaccuracies and affect treatment conformality.
Purpose:
- To investigate the impact of collimator angle rotation on conformal radiation therapy.
- To propose and evaluate a novel method using multiple MLC fields with varying rotation angles.
- To improve target dose uniformity and reduce dose errors in radiation therapy.
Summary:
- A new method utilizing multiple MLC fields with different rotation angles was investigated.
- This technique effectively mitigates the stepped leaf edge effect inherent in conventional MLCs.
- Simulations demonstrated significant improvements in treatment conformality and target dose uniformity.
Impact:
- The proposed method eliminates cold spots in the planning target volume (PTV).
- It reduces hot spots in surrounding normal tissues, enhancing treatment safety.
- This approach offers a significant advancement in achieving precise and effective conformal radiation therapy.
