Robust Optimization for Intensity Modulated Proton Therapy Plans with Multi-Isocenter Large Fields.

Area of Science:

• Medical Physics
• Radiation Oncology
• Computational Biology

Background:

• Intensity modulated proton therapy (IMPT) is an advanced radiation technique.
• Accurate dose delivery is crucial, especially for large treatment fields requiring multiple isocenters.
• Inter-field junction regions are susceptible to dose errors from patient or beam misalignment.

Purpose of the Study:

• To develop and validate a robust optimization approach for IMPT treatment planning in multi-isocenter large fields.
• To improve the dosimetric quality in junction regions and mitigate misalignment errors.
• To enhance the efficiency of treatment planning compared to conventional techniques.

Main Methods:

• A novel optimization algorithm was developed for IMPT planning.
• The approach focuses on creating a low-gradient dose distribution in the critical junction areas.
• The proposed method was compared against the conventional junction shifting technique.

Main Results:

• The developed method successfully generated a low-gradient dose profile in the junction regions.
• This approach effectively mitigated the impact of potential misalignment errors.
• The optimization process demonstrated improved efficiency over the standard junction shifting method.

Conclusions:

• The new optimization approach offers a robust solution for IMPT planning in large fields.
• It enhances treatment safety by minimizing junction dose errors.
• This method presents a more efficient alternative to conventional techniques for complex proton therapy plans.