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SU-E-T-318: Source Position Localization for ICBT Tandem & Ovoid Applicators Utilizing Oncentra Brachy Applicator

J Kemp1,2, M Price1,2

  • 1Louisiana State University, Baton Rouge, LA.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

Nucletron

Keywords:
BrachytherapyComputed tomographyDosimetryMedical image artifactsMedical imagingMedical treatment planningSpatial dimensions

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Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Image artifacts in HDR cervical brachytherapy can hinder accurate dwell position localization.
  • The Nucletron Oncentra Brachy Applicator Modeling plugin (AMp) offers a potential solution by using 3D CAD models for defining dwell positions.

Purpose of the Study:

  • To compare the accuracy of source localization and dosimetric equivalence between clinical practice and the AMp for HDR cervical brachytherapy.
  • To evaluate the impact of AMp-based localization on organs at risk (OARs) in a phantom study.

Main Methods:

  • KVCT imaging of a water phantom with bladder and rectum surrogates and a Fletcher-type tandem and ovoid applicator.
  • Catheter reconstruction using both clinical protocols (dwell position markers) and the AMp within Oncentra's Brachy TPS.
  • Treatment planning to 600cGy at Point A, followed by spatial comparison of dwell positions and dosimetric analysis (D0.1cc, D1cc, D2cc) for surrogates.

Main Results:

  • 80% of dwell positions localized by AMp agreed within 1mm of clinical protocol for a 25mm ovoid/30° tandem applicator.
  • Maximum deviation between AMp and clinical protocol localization was 1.17mm.
  • Dosimetric differences for OAR surrogates were minimal, with slight increases in D0.1cc, D1cc, and D2cc when using AMp.

Conclusions:

  • Preliminary findings suggest that the AMp provides equivalent dosimetry compared to clinical protocols for HDR cervical brachytherapy in a simple phantom setup.
  • Further investigation is ongoing with different ovoid sizes and a vaginal cylinder to validate these results.