A quality assurance program for ancillary high technology devices on a dual-energy accelerator

Area of Science:

• Medical Physics
• Radiation Oncology

Background:

• Advanced ancillary devices, including dual asymmetric jaws, dynamic wedge, portal imaging, and multileaf collimation (MLC), have been integrated into dual-energy linear accelerators.
• Implementation necessitates robust quality assurance (QA) protocols to ensure safe and effective operation.

Purpose of the Study:

• To describe the development and implementation of comprehensive QA programs for high-technology ancillary devices on a dual-energy linear accelerator.
• To ensure the accuracy, reliability, and safety of these advanced technologies in clinical practice.

Main Methods:

• Instituted periodic and patient-specific QA programs covering positional accuracy, output checks, and dosimetric aspects.
• Performed checks for dual asymmetric jaws, MLC, dynamic wedge, and on-line imaging, including patient diode checks for dynamic wedge portals.
• Included annual reviews of device operation and procedures, involving physicists, maintenance engineers, and therapists.

Main Results:

• Successful implementation of QA programs has prevented patient-related errors and device malfunctions.
• Positional accuracy, off-axis factors, output, transmission factors, and imaging parameters are routinely monitored.
• Patient-specific checks and annual reviews contribute to the overall success of the QA initiatives.

Conclusions:

• Comprehensive QA programs are essential for the safe and effective use of advanced ancillary devices in radiation therapy.
• A multidisciplinary team approach is crucial for the successful execution of these QA programs.
• The established QA protocols have demonstrated efficacy in maintaining high standards of care and preventing adverse events.