AnnualQA..doc

Department of Radiation Oncology, Duke University Health System, Durham, NC Report of the Annual Quality Assurance of the Linear Accelerator (Varian Model Clinac 21EX, SN ) For the year of 2007 Summary Tests recommended by the AAPM TG-40 on annual QA of medical linear accelerators were performed. Both mechanical and dosimetric properties were checked against specifications and compared with the dosimetry book. Description, raw data, tolerance, and conclusion were included for each test. Corrective actions were taken when necessary and recorded. Secondary constancy standards were established for daily and monthly QA. Performed by: __________________________________________________ Reviewed by __________________________________________________ SUMMARY OF FINDINGS The machine meets the mechanical and dosimetric specifications and tolerances. The following deviations were found during this QA and corrected: Summary of Annual QA Tests TEST TOLERANCE FINDING Page Mechanical M1 Mechanical Isocenter of Gantry Rotation 1 mm radius Pass 4 M2 Coincidence of Mech. and Rad. Gantry Iso 1 mm Pass 4 M3 Laser Alignment 2 mm Minor adjustment Pass 4 M4 Optical Distance Indicator 2mm Pass 4 M5 Gantry Angle Indicator 1° Pass 4 M6 Collimator Angle Indicator 1° Pass 5 M7 Crosshair Centricity 1 mm radius Pass 5 M8 Coincidence of Mech. and Rad. Crosshair 1 mm Pass 5 M9 Patient Support Assembly Movement 2 mm Pass 5 M10 PSA Rotation Angle 1° Pass 5 M11 PSA Isocenter 1 mm radius Pass 5 M12 Coincidence of Mech. and Rad. PSA Iso 1 mm Pass 6 M13 PSA Level and Sag 0.2°/0.3° Pass 6 M14 Field Size Defined by Light Field 2 mm or 1% Pass 6 M15 Light and Radiation Field Coincidence 2 mm Pass 6 M16 Graticule 2 mm Pass 6 M17 Accessory Functional Check Functional Pass 7 M18 Safety Interlock Functional Pass 7 MLC Checks L1 Field Size Defined by Light Field: MLC 2 mm or 1 % Pass 8 L2 Light and Radiation Field Coincidence: ML