QUASAR Penta-Guide
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Perform true spatial alignment and coincidence tests on IGRT systems ± Enables daily testing to ensure on-board imaging targeting accuracy ± Contains low-density rings and hollow spheres to minimize high-density artifacts ± Simple pass/fail criteria provided ± Testing does not infringe upon patient treatment time ± Optional Penta-Guide Software available to automate and simplify CBCT QA ± Light field alignment 4x4; 10x10; 12x12 ± 16 cm cube -5kg ± 1/4 mm accuracy The Penta-Guide contains low-density rings and hollow spheres designed to minimize imaging artifacts. These unique visualization features provide quick confirmation of the phantom set-up before investing time in the QA procedure. They also serve to ensure isocenter alignment in accordance with accepted radiotherapy tolerances using 2D/2D and 3D/3D match. Carried out by a therapist every morning, testing takes little or no extra time and can be completed during normal daily equipment warm-up procedures. The QUASAR™ Penta-Guide ensures the accuracy of linac-mounted imageguidance systems, including cone beam CT (CBCT), x-ray volumetric imaging (XVI) and on-board imaging (OBI), by enabling daily testing for: User’s Guide Includes: An enhanced Lehmann Yoke testing procedure for confirmation of the source to surface distance (SSD). 3D Cone Beam Registration kV and MV System Coincidence kV and MV Projection Images Laser and Light Field Coincidence Weekly Remote Table Adjustments Optional: PentaGuide Hood is used to confirm that the Varian Frameless Array or other visual position indicator is aligned with the CBCT and OBI Accuracy. Confidence. Specifications subject to change without notice and shall not be liable for any errors or omissions contained in this document. © 2012 Modus Medical Devices Inc. PDS100-1009, 12/12

Accuracy. Confidence. PASS/FAIL CRITERIA For each test there are simple pass/fail criteria. A typical tolerance of +/- 2 mm in x, y, and z directions is recommended. Displacements can be tracked over time for trend analysis using the Excel spreadsheet provided with the Penta-Guide. Alternatively, shifts can be exported to the record and verify system. Left: Phantom centered in field of view, spheres centered in rings *All images 6MV AP Left: Example of translational misalignment Right: Example of rotational misalignment QUASAR™ in Radiation Therapy The Quality Assurance System for Advanced...