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Related Experiment Videos

Dose-volume histograms for bladder and rectum

J Y Ting1, X Wu, J A Fiedler

  • 1Department of Radiation Oncology, Sylvester Cancer Center, University of Miami, FL 33101, USA.

International Journal of Radiation Oncology, Biology, Physics
|July 15, 1997
PubMed
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Current Dose-Volume Histogram (DVH) methods for hollow organs like the bladder and rectum are problematic. Using a shell model, not a solid model, for DVH calculations improves accuracy for these structures.

Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Planning

Background:

  • The Dose-Volume Histogram (DVH) is crucial for quantitative evaluation of radiotherapy treatment plans.
  • Current DVH implementation and interpretation methods may be flawed, particularly for hollow organs.
  • A re-examination of DVH foundations and their clinical implications is needed.

Purpose of the Study:

  • To highlight issues with current Dose-Volume Histogram (DVH) methods for hollow organs.
  • To demonstrate the impact of different modeling approaches (solid vs. shell) on DVH interpretation.
  • To improve the clinical application of DVHs in radiotherapy.

Main Methods:

  • A prostate cancer patient's external beam irradiation plan was used as a data set.

Related Experiment Videos

  • DVH curves for the bladder and rectum were calculated using both solid and shell models.
  • Normal Tissue Complication Probability (NTCP) was assessed for both models.

    • Main Results:

    • The shell model yielded higher DVH curves and NTCP for the bladder and rectum compared to the solid model.
    • This effect was consistent across different treatment plans (e.g., eight-field conformal, six-field conformal, bilateral arcs).

    Conclusions:

    • Current DVH practices often incorrectly model hollow organs like the bladder and rectum as solid structures.
    • The critical structure for Normal Tissue Complication Probability (NTCP) in these organs is the shell, not the contents.
    • Treatment planning algorithms should be updated to incorporate a shell model for DVH computation of hollow organs.