Helium pencil beam commissioning and beam modeling
Lukas Martin1,2,3, Barbara Knäusl1,3,4, Peter Kuess1,3
1MedAustron Ion Therapy Center, Marie Curie-Straße 5, Wiener Neustadt, A-2700, Austria.
Physics and Imaging in Radiation Oncology
|August 8, 2026
Summary
This study successfully commissioned a scanned helium ion beam line, validating its accuracy for cancer treatment. The results show excellent agreement between measurements, treatment planning system calculations, and simulations, supporting clinical use.
Area of Science:
- Medical Physics
- Radiation Oncology
- Particle Therapy
Background:
- Helium ions offer superior dose distribution compared to protons and carbon ions.
- Reduced lateral scattering and fragmentation tail enable sharp dose gradients and better normal tissue sparing.
Purpose of the Study:
- Commission a scanned helium ion pencil beam line.
- Validate the accuracy of the corresponding beam model for clinical applications.
Main Methods:
- Commissioned synchrotron-based helium ion beams (54.6–402.8 MeV/u).
- Measured depth-dose, calibrated absolute dose, and evaluated beam optics.
- Implemented and validated a beam model in RayStation TPS using phantom measurements and Monte Carlo simulations.
Main Results:
- Measured ranges agreed with Monte Carlo simulations within ±0.3 mm.
- Treatment planning system (TPS) predicted doses agreed within 0.1% with measurements.
- Median gamma pass rates exceeded 90% for 3%/1.5 mm criteria in 3D validations.
Conclusions:
- Established stable scanned helium ion beam delivery.
- Demonstrated strong agreement between measurements, TPS calculations, and Monte Carlo simulations.
- Validated beam model supports future research and clinical application of helium ion therapy.
Related Concept Videos
01:19Deflection of a Beam
Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
01:15Prismatic Beams: Problem Solving
In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the designer...
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the designer...
01:30Beams
Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...