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Conformity index: a review.

Loïc Feuvret1, Georges Noël, Jean-Jacques Mazeron

  • 1Institut Curie, Orsay, France. loic.feuvret@cpo.curie.net

International Journal of Radiation Oncology, Biology, Physics
|January 18, 2006
PubMed
Summary

This study critically analyzes conformity indices for 3D conformal radiotherapy (3D-CRT). While helpful for comparing treatment plans, their role in everyday practice remains uncertain.

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Planning

Background:

  • Three-dimensional conformal radiotherapy (3D-CRT) utilizes medical imaging, dosimetry software, and verification procedures.
  • The goal is to optimize radiation dose delivery to target volumes while sparing healthy tissues.
  • Current dosimetry software provides dose distributions but lacks a clear measure of plan conformity.

Purpose of the Study:

  • To critically analyze existing conformity indices in radiotherapy literature.
  • To evaluate the practical application and limitations of these indices.
  • To assess the utility of conformity indices in treatment plan quality evaluation.

Main Methods:

  • Literature review and critical analysis of conformity indices.
  • Evaluation of their applicability in 3D conformal radiotherapy and intensity-modulated radiotherapy.
  • Assessment of their role in comparing treatment plans and guiding clinical decisions.

Main Results:

  • Conformity indices offer a scoring system for treatment plans.
  • They can be used to compare different treatment plans for the same patient.
  • Existing indices do not fully indicate the degree of dose conformity achieved.

Conclusions:

  • Conformity indices are valuable complementary tools for radiotherapy plan assessment.
  • Further development is needed to clarify their role and interpretation in clinical practice.
  • The future utility of conformity indices in routine radiotherapy planning remains to be determined.

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