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Updated: Jan 19, 2026

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Error detection using an electromagnetic tracking system in multi-catheter breast interstitial brachytherapy.

Siti Masitho1,2, Karoline Kallis1, Vratislav Strnad1

  • 1Department of Radiation Oncology, Universitätsklinikum Erlangen, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Erlangen, Germany.

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|September 11, 2019
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Summary

The hybrid treatment delivery system (HTDS) reliably detects errors in breast cancer brachytherapy. This system accurately identifies planning and delivery errors, ensuring quality assurance for patients.

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Area of Science:

  • Medical Physics
  • Oncology
  • Radiotherapy Technology

Background:

  • Multi-catheter interstitial brachytherapy is a crucial treatment for breast cancer.
  • Quality assurance is essential to minimize errors in brachytherapy delivery.
  • Existing methods may not fully address all potential treatment planning and delivery errors.

Purpose of the Study:

  • To evaluate the feasibility of a hybrid treatment delivery system (HTDS) for quality assurance in breast cancer brachytherapy.
  • To assess the HTDS's ability to detect simulated treatment planning and delivery errors.
  • To develop and validate an algorithm for error detection using HTDS.

Main Methods:

  • A prototype afterloader with integrated electromagnetic tracking (EMT) sensor and EMT system was utilized.
  • Simulated treatment planning errors (e.g., incorrect offset, swaps) and delivery errors (e.g., catheter shifts) were introduced using phantoms.
  • An in-house Matlab routine analyzed geometrical deviations between CT-defined and EMT-measured dwell positions.
  • The influence of implant motion on error detection was investigated.

Main Results:

  • The HTDS successfully detected all simulated planning errors.
  • Catheter connection swaps were detected with 100% accuracy.
  • Catheter shifts greater than 1.1 mm were detected with >97% accuracy, even with simulated motion.
  • Catheter reconstruction uncertainties and shifts <2 mm were identified as common errors in patient data.

Conclusions:

  • The hybrid treatment delivery system (HTDS) is a reliable method for detecting errors in multi-catheter interstitial brachytherapy.
  • The developed algorithm effectively identifies and specifies treatment planning and delivery errors.
  • Ongoing patient studies are analyzing real-world data to further validate the system's clinical utility.