Proton beam characterization by proton-induced acoustic emission: simulation studies

Area of Science:

• Medical Physics
• Radiation Oncology
• Acoustics

Background:

• Proton therapy offers precise radiation delivery due to the Bragg peak phenomenon.
• Current range uncertainties limit the accuracy of proton beam therapy.
• Protoacoustic range verification is an emerging technique for characterizing proton beams.

Purpose of the Study:

• To simulate and analyze acoustic waves generated by proton beams in water.
• To investigate the feasibility of protoacoustic range verification for improving proton therapy accuracy.
• To establish a method for verifying proton beam range and dose distribution using acoustic signals.

Main Methods:

• Simulated pressure wave generation from proton radiation passing through water.
• Analysis of acoustic signal components, including two distinct peaks (α and γ).
• Correlation of acoustic signal arrival times and peak widths with beam characteristics.

Main Results:

• Identified two acoustic peaks (α and γ) originating from pre-Bragg peak and Bragg peak regions, respectively.
• Demonstrated that arrival times of acoustic peaks accurately determine beam position and Bragg peak center.
• Showed that acoustic monitoring can verify proton beam range to within approximately 1 mm.

Conclusions:

• Protoacoustic range verification is a viable method for enhancing proton therapy accuracy.
• Acoustic signal analysis provides precise information on proton beam range and dose distribution.
• This technique offers a promising approach for real-time quality assurance in proton therapy.