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SU-E-T-97: Intra and Inter Variability in Beam Data Commissioning among Water Phantom Scanning Systems.

I Das1,2,3, C Chu1,2,3, J Conlon1,2,3

  • 1Indiana University-School of Medicine, Indianapolis, IN.

Medical Physics
|May 19, 2017
PubMed
Summary

Modern water-phantom scanning systems show minimal intra- and inter-variability in commissioning data, typically within ±0.2% accuracy. This indicates high reliability for beam data collection across different vendors and equipment.

Keywords:
Computer softwareData analysisElectron beamsImage detection systemsParticle beam detectorsPhotons

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Physics

Background:

  • Accurate commissioning data is crucial for radiotherapy treatment planning.
  • Various water-phantom scanning systems exist, but their data variability is not well-documented.

Purpose of the Study:

  • To assess the intra- and inter-variability of commissioning data collected by modern water-phantom scanning systems.
  • To evaluate the reliability and consistency of data from different vendors.

Main Methods:

  • Four vendors' water-phantom scanning systems (PTW, Sun Nuclear, Standard Imaging, IBA) were used.
  • Percent depth dose (PDD) and profile data were collected for photon and electron beams.
  • Intra-variability was assessed through repeated measurements; inter-variability was assessed using single setups from each vendor.

Main Results:

  • Intra-variability was consistently low (±0.1%) across all vendors.
  • Inter-variability for PDDs was slightly higher but within acceptable ranges (e.g., 0.02±0.17% for SI vs PTW).
  • Profile inter-variability was <0.1% in central regions but up to ±4.8% in penumbra; polarity effects up to 3% were observed.

Conclusions:

  • Modern water-phantom scanning systems demonstrate minimal variability, achieving data accuracy within ±0.2% when used correctly.
  • System selection should prioritize user comfort with software and hardware.
  • This study offers a valuable comparison of data across different scanning systems.