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Seven-probe fiber detector for time-resolved source tracking in HDR-brachytherapy: Pre-clinical experimental

Mathieu Gonod1, Miguel Angel Suarez2, Samir Laskri3

  • 1Medical physics department, Centre Georges François Leclerc (CGFL) - Dijon, Dijon, France.

Medical Physics
|November 8, 2025
PubMed
Summary

A new Seven-probe Scintillator Detector (7SD) enables precise, real-time in vivo dosimetry (IVD) for high-dose-rate brachytherapy (HDR-BT). This compact, biocompatible system accurately monitors source position and dwell times, enhancing treatment verification and detecting potential errors.

Keywords:
HDR‐brachytherapydwell time and position verificationseven‐probe detector

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Biomedical Engineering

Background:

  • In vivo dosimetry (IVD) is crucial for verifying high-dose-rate brachytherapy (HDR-BT) delivery.
  • Time-resolved techniques like source tracking offer real-time error detection but have been limited in clinical scenarios.

Purpose of the Study:

  • Evaluate a compact, biocompatible Seven-probe Scintillator Detector (7SD) for monitoring HDR-BT.
  • Assess the 7SD's ability to detect source insertion errors across diverse HDR-BT techniques.

Main Methods:

  • Developed a 7SD using Gd2O2S:Tb scintillator probes coupled to optical fibers.
  • Tested the 7SD in a phantom with an Ir-192 HDR afterloader, acquiring data at 0.06s intervals.
  • Calibrated the probe experimentally and confirmed biocompatibility via cytotoxicity tests.

Main Results:

  • Analyzed 4040 dwell positions with high accuracy (99.5% identified).
  • Measured dwell positions deviated minimally (0.224 mm radial, 0.077 mm axial) from planned values.
  • Detected 99.4% of positions within a 1 mm reliability threshold, identifying systematic afterloader errors.

Conclusions:

  • The 7SD is suitable for time-resolved IVD in HDR-BT, enhancing monitoring volume and accuracy.
  • The system can detect afterloader malfunctions, improving HDR-BT setup integrity.
  • The 7SD's capabilities, biocompatibility, and compatibility suggest strong potential for clinical implementation.