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Updated: Jul 19, 2025
06:20
Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
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FLASH Radiotherapy and the Use of Radiation Dosimeters
Sarkar Siddique1, Harry E Ruda2,3, James C L Chow4,5
1Department of Physics, Toronto Metropolitan University, Toronto, ON M5B 2K3, Canada.
Cancers
|August 12, 2023
Summary
FLASH radiotherapy (RT) shows promise for reducing normal tissue toxicity. Monte Carlo simulations and advanced detectors like diamond detectors and radiochromic films are crucial for optimizing this ultra-high dose rate RT technique.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiological Sciences
Background:
- Ultra-high dose rate (UHDR) radiotherapy, termed FLASH RT, offers potential for reduced normal tissue toxicity while preserving tumor control.
- Clinical implementation of FLASH RT faces challenges in treatment planning and achieving adequate depth penetration.
- Accurate dose calculation and measurement are critical for the safe and effective delivery of FLASH RT.
Purpose of the Study:
- To review the role of Monte Carlo (MC) simulations in optimizing FLASH RT treatment planning.
- To evaluate the performance of various radiation detectors for accurate dosimetry in UHDR environments.
- To highlight advancements in detector technology and dosimetry methods for FLASH RT applications.
Main Methods:
- Monte Carlo (MC) simulation codes (EGSnrc, DOSXYZnrc, Geant4) were investigated for dose distribution simulation and treatment plan optimization.
- Performance of solid-state detectors (e.g., microDiamond) and ionization chambers were assessed for UHDR and ultra-high dose per pulse (UHDPP) measurements.
- Radiochromic films (Gafchromic EBT3) were used for absolute dose measurement, MC validation, and characterization of detectors in FLASH RT conditions.
Main Results:
- MC simulations provide accurate dose calculations essential for FLASH RT optimization.
- Diamond detectors show linear responses in UHDR/UHDPP ranges, agreeing well with reference detectors.
- Advancements in ionization chamber dosimetry, including new models for ion recombination, improve accuracy at UHDPP.
- Radiochromic films effectively validate MC simulations and characterize dose distributions.
Conclusions:
- MC simulations and advanced radiation detectors are vital tools for advancing FLASH RT.
- Continued research in treatment planning and detector technology is necessary for widespread clinical adoption of FLASH RT.
- FLASH RT holds significant potential to revolutionize cancer treatment through improved therapeutic ratios.
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