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Related Experiment Video

Updated: Jun 30, 2026

Expedited Radiation Biodosimetry by Automated Dicentric Chromosome Identification ADCI and Dose Estimation
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Comparison and Evaluation of Different Radiotherapy Techniques Using Biodosimetry Based on Cytogenetics.

Aggeliki Nikolakopoulou1,2, Vasiliki Peppa2,3, Antigoni Alexiou3

  • 1Laboratory of Health Physics, Radiobiology & Cytogenetics, Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Centre for Scientific Research ''Demokritos'', 15310 Athens, Greece.

Cancers
|January 11, 2022
PubMed
Summary

Advanced radiotherapy techniques like VMAT and IMRT may deliver a lower biological dose than conventional 3D-CRT. This study used biodosimetry to compare these radiotherapy methods, finding a ~6% underestimation for VMAT and IMRT.

Keywords:
VMATbiodosimetryradiation dosimetryradiobiological techniquesradiotherapy

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Area of Science:

  • Radiation oncology
  • Medical physics
  • Cytogenetics

Background:

  • Technological advancements in radiotherapy aim for precise radiation delivery and reduced side effects.
  • Evaluating the biological dose and radiobiological impact of prolonged radiotherapy is crucial.
  • Comparing advanced techniques (VMAT, IMRT) with conventional 3D-CRT using biological dosimetry is needed.

Purpose of the Study:

  • To compare the biological dose delivered by volumetric modulated arc therapy (VMAT) and intensity-modulated radiation therapy (IMRT) against conventional 3D-CRT.
  • To investigate the radiobiological impact of protracted radiotherapy treatment duration.
  • To assess radiotherapy efficacy using cytogenetic biodosimetry.

Main Methods:

  • Utilized a dicentric biodosimetry assay on peripheral blood lymphocytes from prostate cancer patients and the PC3 cell line.
  • Irradiated samples using 3D-CRT, IMRT, and VMAT techniques.
  • Estimated absorbed dose by scoring dicentric chromosome frequencies.

Main Results:

  • IMRT and VMAT showed a statistically significant ~6% underestimation of the biological absorbed dose compared to 3D-CRT in lymphocytes.
  • VMAT and IMRT results were comparable, with VMAT showing slightly lower values.
  • Similar underestimation trends were observed using the PC3 cell line.

Conclusions:

  • Modulated radiotherapy techniques (IMRT, VMAT) may deliver a lower biological dose than 3D-CRT.
  • The observed underestimation might be linked to the lower dose rate and longer irradiation times in VMAT and IMRT.
  • Biodosimetry is a valuable tool for evaluating the radiobiological effectiveness of different radiotherapy techniques.