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Updated: Nov 26, 2025

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Portal dosimetry in radiotherapy repeatability evaluation.

Krzysztof Ślosarek1, Dominika Plaza1, Aleksandra Nas1

  • 1Radiotherapy Planning Department, Maria Skłodowska-Curie National Research Institute of Oncology, Gliwice Branch, Poland.

Journal of Applied Clinical Medical Physics
|December 14, 2020
PubMed
Summary

Portal dosimetry using the EPID device effectively assesses radiotherapy repeatability. Stereotactic techniques show the best treatment consistency, while breath-holding techniques demonstrate lower compliance, highlighting the impact of technique on accuracy.

Keywords:
EPIDfluence mapsgamma analysistransit dosimetry

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Quality Assurance

Background:

  • Radiotherapy accuracy is crucial, driving development in dosimetry and quality procedures.
  • Oncology centers implement pretreatment verification, online dose checks, and patient tracking.
  • Assessing radiotherapy repeatability is essential for ensuring treatment efficacy and patient safety.

Purpose of the Study:

  • To evaluate the utility of portal dosimetry for assessing radiotherapy repeatability.
  • To compare treatment consistency across different dynamic radiotherapy techniques.
  • To identify factors influencing radiotherapy accuracy and repeatability.

Main Methods:

  • Analysis of 74 cases treated with dynamic radiotherapy techniques.
  • Transit dosimetry performed on collision-free radiation beams.
  • Comparison of summary fluence maps using the gamma coefficient for 6798 pairs.
  • Statistical analysis (chi², Fisher's exact, Mann-Whitney U-test) to compare techniques and assess repeatability.

Main Results:

  • Stereotactic fractionated radiotherapy demonstrated the highest compatibility between treatment fractions.
  • Breath-hold techniques exhibited the lowest percentage of compliance in analyzed fluence pairs.
  • Treatment repeatability was significantly associated with the specific radiotherapy technique employed.
  • Treated volume location was identified as another critical factor influencing treatment accuracy.

Conclusions:

  • Portal dosimetry, particularly with EPID, is a valuable tool for evaluating radiotherapy repeatability.
  • The choice of radiotherapy technique significantly impacts treatment consistency.
  • The proposed fluence map comparison method can detect deviations in individual treatment fractions.