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Dose-volume specification: new challenges with intensity-modulated radiation therapy.

James A Purdy1

  • 1Department of Radiation Oncology, Mallinckrodt Institute of Radiology, Washington University Medical Center, St. Louis, MO 63110, USA.

Seminars in Radiation Oncology
|July 16, 2002
PubMed
Summary

Accurate reporting of radiation oncology volumes and doses is crucial for clinical studies. Advanced techniques like 3D-CRT and IMRT require precise specification due to increased sensitivity to uncertainties.

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Techniques

Background:

  • Clear specification of radiation oncology volumes and doses is essential but often inadequately reported in literature.
  • Complexity increases with advanced techniques like three-dimensional conformal radiation therapy (3D-CRT) and intensity-modulated radiation therapy (IMRT).
  • 3D-CRT and IMRT are more sensitive to geometric uncertainties than conventional therapy due to sharp dose gradients.

Purpose of the Study:

  • To review the current status of specifying target volumes and doses for 3D-CRT and IMRT.
  • To discuss the application of International Commission on Radiation Units and Measurements (ICRU) Reports 50 and 62 recommendations.
  • To emphasize the importance of accounting for clinical and spatial uncertainties in treatment planning and delivery.

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Main Methods:

  • Literature review of current practices in radiation oncology.
  • Analysis of reporting requirements for Radiation Therapy Oncology Group (RTOG) protocols.
  • Discussion of International Commission on Radiation Units and Measurements (ICRU) guidelines.

Main Results:

  • Reporting of treatment techniques in radiation oncology literature is often ambiguous.
  • Geometric uncertainties pose greater challenges in 3D-CRT and IMRT compared to conventional radiotherapy.
  • Physicians and physicists must prioritize understanding and mitigating uncertainties in advanced radiotherapy planning.

Conclusions:

  • Standardized and unambiguous reporting of volumes and doses is critical for radiation oncology research.
  • Adherence to ICRU recommendations and careful consideration of uncertainties are imperative for safe and effective 3D-CRT and IMRT.
  • Accurate reporting and uncertainty management are vital for advancing cancer patient treatment outcomes.