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Verification system for intensity-modulated radiation therapy with scintillator.

Yasuharu Ando1, Kentaro Miki2, Jun Araki3

  • 1Hiroshima City Asa Citizens Hospital, Hiroshima, Japan. ibanez-gravity@hotmail.co.jp.

Physical and Engineering Sciences in Medicine
|November 18, 2020
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Summary

A new scintillator-based tool accurately verifies intensity-modulated radiation therapy (IMRT) doses. This method improves dose accuracy and allows detailed field-by-field or segment-by-segment analysis for optimized patient treatment.

Keywords:
Dose verificationIMRTRadiation therapyScintillator

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Imaging and Detection

Background:

  • Patient-specific verification is crucial for optimizing intensity-modulated radiation therapy (IMRT).
  • Accurate estimation of accumulated dose and detailed analysis of individual fields or segments are essential for treatment quality assurance.

Purpose of the Study:

  • To develop and validate an original IMRT verification tool utilizing scintillator light and an analysis workflow.
  • To accurately estimate accumulated dose and enable field-by-field or segment-by-segment verification for IMRT.

Main Methods:

  • Developed an IMRT verification tool based on scintillator light detection and an analysis workflow.
  • Calibrated raw light distribution considering field size dependency and light diffusion in water.
  • Converted calibrated light distribution to dose and compared with clinical plans using gamma analysis (2-mm/3% criteria).

Main Results:

  • Light diffusion calibration reduced maximum dose difference from 7.7 cGy to 3.9 cGy at the field edge.
  • Average dose difference and gamma pass rate for accumulated dose in six patients were 0.8 ± 4.5 cGy and 97.4%.
  • Field-by-field and segment-by-segment analyses showed high accuracy with average dose differences of 0.2 ± 1.2 cGy and -0.03 ± 0.2 cGy, respectively.

Conclusions:

  • The developed scintillator-based system provides accurate and detailed verification for IMRT.
  • The tool enables simultaneous and independent analysis of each field or segment, enhancing treatment quality assurance.
  • This method offers equivalent performance to chromodynamic film for IMRT verification.