MO-E-BRCD-01: Proton Treatment Planning Issues.

Area of Science:

• Medical Physics
• Radiation Oncology
• Particle Therapy

Background:

• Proton treatment planning presents unique challenges impacting accuracy and delivery robustness.
• Issues like patient setup uncertainty and CT number calibration, common in photon planning, have amplified effects in proton therapy.
• Particle therapy introduces specific challenges such as range uncertainty and variations in Linear Energy Transfer (LET) and Relative Biologic Effectiveness (RBE).

Purpose of the Study:

• To elucidate the complexities and issues inherent in proton treatment planning.
• To compare and contrast the challenges faced in proton therapy versus traditional photon therapy planning.
• To present and analyze diverse error reduction strategies implemented across three distinct clinical centers for proton therapy.

Main Methods:

• Discussion of documented proton treatment planning issues.
• Analysis of error reduction methods tailored to proton therapy delivery techniques (scattering vs. scanning, single-field vs. multi-field optimization).
• Case examples from three clinical centers illustrating practical error minimization strategies.

Main Results:

• Identification of key proton-specific planning issues, including range uncertainty, LET/RBE variations, and amplified setup uncertainties.
• Demonstration of how planning and delivery method choices influence the effectiveness of error reduction strategies.
• Highlighting of successful clinical implementations of error reduction techniques across various treatment sites and modalities.

Conclusions:

• Addressing proton treatment planning complexities is crucial for accurate and robust radiation delivery.
• Clinical centers have developed diverse, site-specific methods to mitigate proton dosimetry errors.
• Understanding these issues and solutions is vital for advancing proton therapy efficacy.