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Poster - Thur Eve - 03: LDR to HDR: RADPOS applications in brachytherapy.

A J Cherpak1, J E Cygler1,2, G Kertzscher3

  • 1The Ottawa Hospital Cancer Centre, Ottawa ON.

Medical Physics
|May 19, 2017
PubMed
Summary

The RADPOS system accurately measures dose and position during brachytherapy. This in vivo dosimetry tool enhances quality control for permanent seed implantation and high dose rate treatments, ensuring patient safety.

Keywords:
BrachytherapyCalibrationControl systemsDosimetryElectromagnetic radiation detectorsMOSFETsPosition sensitive detectorsQuality assuranceRadiation therapyUltrasonics

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Dosimetry

Background:

  • Quality control in brachytherapy is crucial due to high dose gradients.
  • In vivo dosimetry systems are needed to verify treatment accuracy.
  • The RADPOS system integrates positioning and dose measurement capabilities.

Purpose of the Study:

  • To evaluate the RADPOS system for quality control in prostate brachytherapy.
  • To assess the feasibility of RADPOS for high dose rate (HDR) brachytherapy.
  • To determine the accuracy of RADPOS for dose and displacement measurements.

Main Methods:

  • RADPOS system used in patients during permanent prostate brachytherapy seed implantation.
  • Dose and position data collected via a Foley catheter in the urethra.
  • RADPOS detector calibrated and tested in an acrylic phantom for HDR brachytherapy simulation.

Main Results:

  • Average displacement during permanent seed implantation ranged from 1.4-5.1 mm.
  • Maximum integral dose in the prostatic urethra varied, influenced by rectal probe presence.
  • RADPOS demonstrated an average calibration coefficient of 0.74±0.11 cGy/mV for HDR brachytherapy with a 5±20% absolute difference in dose measurement.

Conclusions:

  • The RADPOS system is a viable tool for in vivo dosimetry in brachytherapy.
  • Simultaneous dose and displacement measurement enhances quality control.
  • RADPOS accuracy supports its use in challenging brachytherapy treatments.