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Related Experiment Video

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Long-term stability of a three-dimensional dose verification system.

Motoharu Sasaki1, Hitoshi Ikushima2, Wataru Sugimoto3

  • 1Department of Therapeutic Radiology, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan. msasaki@tokushima-u.ac.jp.

Radiological Physics and Technology
|February 2, 2020
PubMed
Summary

Patient-specific quality assurance in radiation therapy is shifting towards 3D dose verification systems. This study found that these systems show stable sensitivity over two years, ensuring reliable dose verification for intensity-modulated and volumetric modulated arc therapy.

Keywords:
Long-term stabilityPatient-specific QAThree-dimensional dose verification systemVMAT

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Quality Assurance

Background:

  • Intensity-modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) are increasingly used.
  • Current dose verification methods are time-consuming.
  • A shift towards 3D dose verification systems is expected for patient-specific quality assurance.

Purpose of the Study:

  • To evaluate the long-term sensitivity and reliability of 3D dose verification systems.
  • To compare 3D dose verification with conventional methods (ionization chamber and film).
  • To assess the stability of 3D systems over a two-year period.

Main Methods:

  • Simultaneous dose verification using a 3D system and conventional methods (ionization chamber, Gafchromic film) for a head and neck cancer case over two years.
  • Regular calibration and verification of linear accelerator output, mechanical accuracy, and precision.
  • Gamma analysis of 3D dose verification data using distance-to-agreement criteria (2mm/2%, 3mm/3%).

Main Results:

  • Conventional methods confirmed linear accelerator output, mechanical accuracy, and precision.
  • The 3D dose verification system achieved a near 100% passing rate with gamma analysis at 2mm/2% and 3mm/3%.
  • No significant change in the sensitivity of the 3D dose verification system was observed over two years.

Conclusions:

  • 3D dose verification systems demonstrate stable performance and reliability over time.
  • These systems are suitable for efficient patient-specific quality assurance in advanced radiation therapy techniques.
  • Routine verification ensures the accuracy and precision of radiation delivery.