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Updated: Jan 7, 2026

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
Published on: February 6, 2019
Experimental design and control methods for dose rate optimization in a synchrotron-based proton therapy beamline.
Jason Tang1,2, Daniel Liu1,3, Jacob Mathew1,4
1Department of Radiation Physics The University of Texas MD Anderson Cancer Center Houston USA.
Tungsten scatterers precisely control proton therapy dose rates, enabling FLASH radiotherapy research. This passive method achieves dose rates from 10 to 289 Gy/s without altering accelerator settings.
Area of Science:
- Medical Physics
- Radiation Oncology
- Particle Therapy
Background:
- Ultra-high dose rate radiotherapy (>40 Gy/s) shows promise for normal tissue sparing and tumor control (FLASH effect).
- Precise dose rate control is a technical challenge in proton therapy, especially for research.
Purpose of the Study:
- To develop and validate a passive technique for dose rate adjustment in proton therapy using tungsten scatterers.
- To achieve controllable dose rate modulation without modifying accelerator parameters.
Main Methods:
- Investigated dose rate modulation using tungsten foils (0.1-3.5 mm) in an 87.2 MeV proton beamline.
- Utilized Monte Carlo simulations (Geant4) and experimental validation with ionization chambers and radiochromic films.
Main Results:
- Observed an inverse exponential relationship between dose rate and tungsten thickness, with rates from 10.2 to 288.9 Gy/s.
- Monte Carlo simulations accurately predicted experimental measurements within 95% confidence intervals.
- Tungsten scatterers progressively broadened lateral dose profiles, with good agreement between film and simulation.
Conclusions:
- Tungsten scatterer thickness modulation offers a practical and controllable method for adjusting dose rates across conventional and FLASH regimes.
- This passive approach enables precise dose rate control for preclinical radiobiological research without accelerator modifications.
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