Related Experiment Video
Updated: Jun 12, 2026
08:30
X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
Published on: September 11, 2011
Experimental study on photon-beam peripheral doses, their components and some possibilities for their reduction
Ndimofor Chofor1, Dietrich Harder, Antje Rühmann
1Radiation Physics Research Group, Carl von Ossietzky University Oldenburg, Germany.
Physics in Medicine and Biology
|June 26, 2010
Summary
Peripheral doses in radiotherapy can be reduced by addressing beam head leakage and extrafocal radiation. Simple shielding strategies are effective, especially for small radiation fields, minimizing risks of secondary cancers.
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- Peripheral doses in photon beam radiotherapy contribute to secondary malignancies.
- Understanding the components of peripheral dose is crucial for developing mitigation strategies.
Purpose of the Study:
- To analyze peripheral dose components from a Siemens Primus 6/15 linear accelerator.
- To identify and evaluate technical strategies for reducing avoidable peripheral doses.
Main Methods:
- Component analysis of peripheral doses using phantom and detector arrangements.
- Evaluation of shielding measures for beam head leakage in crossplane and inplane directions.
Main Results:
- Peripheral doses comprise contributions from scattering, beam head leakage, and extrafocal radiation.
- Adjustable shielding blocks and multileaf collimator adjustments effectively reduce beam head leakage.
- Shielding effectiveness is greatest for small fields and shallow depths.
Conclusions:
- Peripheral doses are not solely due to scattering; beam head leakage and extrafocal radiation are significant, partly avoidable components.
- Technical strategies can reduce these avoidable doses, contributing to safer radiotherapy.
- Further research is needed to address extrafocal radiation reduction.
