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Related Experiment Video

Updated: Jun 19, 2025

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

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Proton Beam Range and Charge Verification Using Multilayer Faraday Collector.

Ping L Yeap^1,2, Kah S Lew^1,3, Wei Y C Koh¹

¹Division of Radiation Oncology, National Cancer Centre Singapore, Singapore, Singapore.

Technology in Cancer Research & Treatment

|July 25, 2024

Summary

This summary is machine-generated.

A new multilayer Faraday collector (MLFC) offers a quick and accurate method for quality assurance in proton therapy. This tool verifies proton beam range and charge, improving treatment efficiency and patient safety.

Keywords:

multi-layer Faraday collector proton beam therapy proton range quality assurance

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Area of Science:

Medical Physics
Radiation Oncology
Particle Therapy

Background:

Proton therapy requires daily quality assurance (QA) to ensure accurate beam energy and total charge.
Precise range verification is critical for effective tumor irradiation and minimizing healthy tissue damage.

Purpose of the Study:

To propose and validate a time-efficient method for verifying proton beam range and total charge using a multilayer Faraday collector (MLFC).
To enhance the workflow efficiency of proton therapy QA procedures.

Main Methods:

Utilized an MLFC-128-250 MeV with 128 copper foil layers to measure charge deposition from proton beams.
Integrated charge measurements using a multichannel electrometer to determine beam range.
Compared MLFC-derived range and charge data with established water tank measurements and treatment planning system models.

Main Results:

MLFC-determined proton beam range closely correlated with commissioning water tank measurements, with a maximum deviation of 0.4 g/cm² after calibration.
MLFC range measurements demonstrated stability over multiple weeks and independence from monitor units and source-to-surface distance.
Total charge collected by the MLFC closely matched the theoretical charge from the beam model for low- and mid-range energies.

Conclusions:

The MLFC has been successfully calibrated and commissioned as a reliable tool for verifying proton beam range and total charge.
Implementation of the MLFC is expected to significantly improve the efficiency of daily proton therapy QA workflows.