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Technical Note: A novel dosimeter improves total skin electron therapy surface dosimetry workflow.

Irwin I Tendler1, Petr Bruza1, Michael Jermyn1,2

  • 1Thayer School of Engineering, Dartmouth College, Hanover, NH, USA.

Journal of Applied Clinical Medical Physics
|April 20, 2020
PubMed
Summary

A new scintillator dosimeter system accurately measures surface dose during Total Skin Electron Therapy (TSET). This system is faster and requires less manual work than optically stimulated luminescence detectors (OSLDs), reducing errors.

Keywords:
OSLDdosimeterefficiencyoptical imagingscintillatorsurface dosimetryworkflow

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • Accurate surface dose measurement is crucial for effective Total Skin Electron Therapy (TSET).
  • Current methods like optically stimulated luminescence detectors (OSLDs) have limitations including processing time and potential for operator error.
  • Novel dosimetry systems are needed to improve efficiency and accuracy in TSET surface dose monitoring.

Purpose of the Study:

  • To quantitatively analyze the workflow of a novel scintillator-based dosimetry system for TSET surface dose measurement.
  • To compare the workflow efficiency and accuracy of the scintillator system against standard OSLDs.
  • To evaluate the scintillator system's reusability, radiation resistance, and impact on surface dose.

Main Methods:

  • Disc-shaped scintillators and OSLDs were attached to phantoms and a patient undergoing TSET.
  • Scintillator light emission was captured by a time-gated, intensified camera during irradiation.
  • Dose was calculated using a calibration factor, and workflow times for both systems were tracked.

Main Results:

  • Scintillator and OSLD surface dose measurements agreed within 3% in phantoms and within 5% (OSLD) and 3% (scintillator) on patients.
  • The scintillator system's end-to-end workflow was significantly faster: 78 seconds vs. 202 seconds in phantom studies.
  • Patient treatment surface dose assessment was completed in 386 seconds with scintillators versus 754 seconds with OSLDs.

Conclusions:

  • Scintillator-based dosimetry offers a nearly twofold increase in speed compared to OSLDs for TSET surface dose measurement.
  • The scintillator system requires less manual intervention, reducing the likelihood of human error.
  • Automated data saving and permanent image records enhance the reliability and traceability of dose measurements.