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Related Experiment Video

Updated: May 22, 2026

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
08:34

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Published on: February 6, 2019

Conformal fields in prostate radiotherapy: a comparison between measurement, calculation and simulation.

Seied R Mahdavi1, Hamed Rezaeejam, Alireza Shirazi

  • 1Department of Medical Physics, Tehran University of Medical Sciences, Tehran, Iran.

Journal of Cancer Research and Therapeutics
|April 26, 2012
PubMed
Summary

This study confirms that treatment planning systems (TPS) accurately calculate dose distribution in conformal fields (CF). Monte Carlo simulations and measurements validate TPS accuracy for prostate radiotherapy planning.

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Radiation Dosimetry

Background:

  • Accurate dose calculation is critical for effective radiotherapy.
  • Conformal fields (CF) are widely used in modern radiation therapy.
  • Treatment planning systems (TPS) require validation for dose calculation accuracy.

Purpose of the Study:

  • To assess the accuracy of a TPS in calculating dose distribution parameters for conformal fields (CF).
  • To compare TPS calculations with measurements and Monte Carlo simulations for CF dosimetric parameters.

Main Methods:

  • Evaluated percentage depth dose (PDD) curves and beam profiles (BP) using a field analyzer water phantom.
  • Employed Monte Carlo N-Particle code (MCNP4C) to model CF dose specification factors and linear accelerator head.
  • Compared TPS calculations against experimental measurements and MCNP4C simulations.

Main Results:

  • Distance to agreement (DTA) and dose difference (DD) were within established acceptance criteria (3 mm and 3%).
  • TPS calculations demonstrated strong agreement with both measurement and Monte Carlo simulation data.
  • The equivalent tissue air ratio method in TPS proved convenient for dose prediction in standard CF.

Conclusions:

  • The treatment planning system (TPS) is accurate for dose prediction in non-small conformal fields used in prostate radiotherapy.
  • Monte Carlo simulation shows high correlation with measurements and TPS, supporting its use for complex field calculations.
  • Validated TPS accuracy enhances confidence in radiotherapy treatment planning and delivery.