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An R-Based Landscape Validation of a Competing Risk Model
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Technical note: calculation of normal tissue complication probability using Gaussian error function model.

James C L Chow1, Daniel Markel, Runqing Jiang

  • 1Department of Radiation Oncology, University of Toronto, Ontario M5G 2M9, Canada. james.chow@rmp.uhn.on.ca

Medical Physics
|October 23, 2010
PubMed
Summary
This summary is machine-generated.

The Gaussian error function accurately models normal tissue complication probability (NTCP) for rectal dose-volume histograms (DVH), reducing data needs. This method shows minimal variation in NTCP with interfraction prostate motion.

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Biostatistics

Background:

  • Normal tissue complication probability (NTCP) calculations are crucial in radiation therapy planning.
  • Traditional NTCP models rely on detailed dose-volume histogram (DVH) data, which can be extensive.
  • Reducing the size of the DVH database can streamline NTCP calculations.

Purpose of the Study:

  • To evaluate the application of the Gaussian error function in normal tissue complication probability (NTCP) calculations.
  • To reduce the dose-volume histogram (DVH) database by using error function parameters for differential DVH (dDVH).
  • To assess the impact of interfraction prostate motion on rectal NTCP.

Main Methods:

  • Intensity modulated radiation therapy (IMRT) treatment planning was performed for three patients with varying prostate volumes.
  • Rectal dDVH was modeled using the Gaussian error function, accounting for interfraction prostate motion.
  • Rectal NTCP was calculated using both the standard dose-volume bin set and the Gaussian error function model.

Main Results:

  • The Gaussian error function model demonstrated a deviation of +/- 0.1% compared to the treatment planning system (TPS) for rectal NTCP.
  • Rectal NTCP varied minimally (within +/- 0.2%) with interfraction prostate motion along the anterior-posterior direction.
  • The impact of prostate motion on rectal NTCP variation was more pronounced in patients with larger prostates.

Conclusions:

  • The Gaussian error function is a viable method for NTCP calculation, offering a reduced DVH database.
  • This approach provides an efficient alternative for NTCP assessment in radiation therapy.
  • Interfraction prostate motion can influence rectal NTCP, with a greater effect observed in larger prostates.