Fractionation in radiotherapy (review)

Area of Science:

• Radiation Oncology
• Medical Physics
• Radiobiology

Background:

• Historical overview of radiation treatment administration.
• Empirical approach to radiotherapy fractionation and its limitations.
• Need for clear classification of fractionation parameters.

Purpose of the Study:

• Critically assess criteria influencing radiotherapy fractionation.
• Identify and evaluate limitations in empirical fractionation approaches.
• Clarify the complex biological consequences of radiation therapy.

Main Methods:

• Historical review of radiation treatment methods.
• Critical assessment of fractionation criteria and their limitations.
• Analysis of literature reports illustrating key concepts.

Main Results:

• Identified limitations in the empirical approach to fractionation.
• Stressed the importance of classifying fractionation into time, dose, and fraction factors.
• Demonstrated that acute and late normal tissue damage mechanisms are complex and not solely time-dependent.

Conclusions:

• Accurate evaluation of radiation therapy's biological effects requires understanding fractionation components.
• Normal tissue radiation damage mechanisms are multifactorial, involving more than just the time factor.
• A structured approach to analyzing radiotherapy fractionation is essential for effective treatment.