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Improved error detection using a divided treatment plan in volume modulated arc therapy.

Kazuo Tarutani1,2, Masao Tanooka1,3, Hiroshi Doi1,4

  • 1Department of Radiology, Hyogo College of Medicine, 1-1 Mukogawa-cho, Nishinomiya, Hyogo 663-8501, Japan.

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Dividing volume modulated arc therapy (VMAT) treatment plans into sections improved error detection. This method enhances quality assurance for radiation therapy by verifying portal imaging with greater accuracy.

Keywords:
Electronic portal imaging deviceSetup errorVolume modulated arc therapy

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Quality Assurance

Background:

  • Volume modulated arc therapy (VMAT) reduces treatment time by using a moving radiation beam.
  • VMAT treatment planning is complex, involving numerous parameters.
  • Pre-treatment quality assurance is critical in VMAT research.

Purpose of the Study:

  • To enhance error detection capabilities in VMAT.
  • To improve the accuracy of quality assurance processes for VMAT.

Main Methods:

  • An established VMAT prostate treatment plan was divided into 12° × 30° sections.
  • Gamma analysis was performed on image data from each section, focusing on errors and integral data.
  • The method was tested using five different patient plans.

Main Results:

  • All integrated image data resulting from errors achieved 100% in gamma analysis (tolerance 0.5 mm/0.5%).
  • Dividing treatment plans shifted mean gamma analysis values, improving discrimination ability.
  • Specific directional shifts observed: cranial (94.59%), left (98.83%), and ventral (96.58%).

Conclusions:

  • Dividing and verifying portal imaging significantly improves error discrimination ability in VMAT.
  • This approach offers a more precise method for quality assurance in radiation therapy.
  • Enhanced error detection contributes to safer and more effective cancer treatments.