Range verification system using positron emitting beams for heavy-ion radiotherapy.

Area of Science:

• Medical Physics
• Radiotherapy Technology
• Particle Beam Applications

Background:

• Heavy-ion radiotherapy offers superior dose localization but requires precise range verification to minimize uncertainties.
• Reducing range ambiguities is crucial for optimizing treatment planning and maximizing the benefits of heavy-ion therapy.

Purpose of the Study:

• To develop and evaluate a novel range verification system utilizing positron emitting beams for direct in-vivo range measurement in patients.
• To assess the system's performance and confirm its designed properties for clinical application in heavy-ion radiotherapy.

Main Methods:

• Development of a range verification system employing positron emitting beams.
• Evaluation of the system's performance through beam experiments.
• Parametric measurements investigating the influence of beam size, momentum acceptance, and target volume on range verification accuracy.

Main Results:

• A 10C beam was identified as suitable for range verification, with measured beam properties aligning with design specifications.
• Range verification accuracy was found to be largely independent of beam size, momentum acceptance, and target volume.
• Precise range measurement within +/-0.3 mm uncertainty was achieved with 2.7 x 10(5) particles, simulating clinical conditions.

Conclusions:

• The developed positron emitting beam system effectively verifies heavy-ion ranges, addressing a critical need in radiotherapy.
• The system's robustness and accuracy, demonstrated in phantom studies, support its potential for direct patient range verification.
• This technology promises to enhance the precision of heavy-ion radiotherapy, improving treatment outcomes through better dose localization.