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This study introduces new electronic portal imaging device (EPID) tools for efficient and accurate linear accelerator (LINAC) quality assurance (QA). The developed system streamlines daily QA, ensuring precise treatment delivery with advanced imaging technology.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Imaging Technology

Background:

  • Increasing complexity in radiation therapy necessitates advanced quality assurance (QA) tools.
  • Current QA methods require improvement in efficiency, comprehensiveness, accuracy, and sensitivity.
  • Electronic portal imaging devices (EPIDs) and kV flat panel detectors offer potential for enhanced QA.

Purpose of the Study:

  • To present novel hardware and software tools for comprehensive linear accelerator (LINAC) QA.
  • To utilize electronic portal imaging devices (EPIDs) and kV flat panel detectors exclusively for QA.
  • To improve the efficiency and accuracy of daily LINAC QA procedures.

Main Methods:

  • Developed a daily QA phantom for MV-beams and kV onboard imaging (OBI).
  • Integrated MV transmission and resolution tests with kV contrast resolution tests.
  • Automated image acquisition and developed software for simultaneous analysis of MV and kV images.
  • Derived traditional QA parameters (output, flatness, symmetry, etc.) from EPID and kV detector images.
  • Validated the EPID-based QA tools on a Varian TrueBeam LINAC over three months.

Main Results:

  • Machine output constancy within ±0.5% compared to ion-chamber.
  • Beam symmetry and flatness deviations within ±0.5% and ±1.2% respectively.
  • Detection of MLC position errors as small as 0.5 mm.
  • Field size and phantom positioning accuracy within 0.5 mm.
  • Complete daily QA process takes approximately 15 minutes for multiple tests.

Conclusions:

  • EPID-based QA tools provide a viable, efficient, and comprehensive solution for daily LINAC performance evaluation.
  • The developed system enhances accuracy and sensitivity in QA processes.
  • This approach supports the complex demands of modern radiation therapy delivery.