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Related Experiment Videos

Modeling late effects in hypofractionated stereotactic radiotherapy

P W Hoban1, L C Jones, B G Clark

  • 1Department of Radiation Oncology, Prince of Wales Hospital, Randwick NSW, Australia.

International Journal of Radiation Oncology, Biology, Physics
|February 16, 1999
PubMed
Summary

Increasing radiation fraction size may reduce late normal tissue effects, offering a therapeutic advantage in radiotherapy. This approach is biologically sound when high doses are confined to small tissue volumes, improving cell survival.

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Area of Science:

  • Radiation oncology
  • Radiobiology
  • Medical physics

Background:

  • Late responding normal tissues are susceptible to radiation damage.
  • Stereotactic radiotherapy (SRT) allows for high dose conformation, potentially minimizing normal tissue exposure.
  • Understanding the impact of fraction size on normal tissue and tumor response is crucial for optimizing radiotherapy regimens.

Purpose of the Study:

  • To investigate the effect of increasing radiation fraction size on cell survival in late responding normal tissues.
  • To determine if total radiation dose can be reduced for constant tumor cell kill with larger fractions, offering an advantage to surrounding normal tissues.
  • To assess how dose conformation in SRT minimizes the volume of normal tissue damaged by larger fraction sizes.

Main Methods:

Related Experiment Videos

  • The linear-quadratic (LQ) model was employed to calculate dose reductions with increased fraction size, using varying tumor alpha/beta ratios (5 Gy and 10 Gy).
  • Normal tissue effects were calculated using an alpha/beta ratio of 3 Gy, assessing effects at different isodose levels.
  • Integral biologically effective dose (IBED) in the brainstem was calculated, considering variations with isocenter position and fraction size.

Main Results:

  • Increasing the dose per fraction leads to a decrease in total dose, reducing late normal tissue effects at low isodose levels.
  • The threshold for therapeutic advantage correlates with the ratio of normal tissue to tumor alpha/beta ratios.
  • Brainstem IBED increases with higher doses per fraction when large volumes are encompassed by high isodose levels.

Conclusions:

  • Hypofractionation (larger fraction sizes) can be biologically advantageous when high doses are confined to small volumes of normal tissue.
  • Larger fraction sizes demonstrate a calculated benefit in terms of normal tissue cell survival at low isodose levels.