Daily Cone Beam CT QA

The QUASAR™ Penta-Guide phantom is used for the commissioning and daily testing of Image-Guided Radiotherapy (IGRT) systems. The Penta-Guide ensures the accuracy of linac-mounted image guidance systems, including cone beam CT (CBCT), x-ray volumetric imaging (XVI) and on-board imaging (OBI). Using low-density objects to minimize imaging artefacts, the Penta-Guide allows rapid and easy daily testing for:

• 3D cone beam registration
  
• kV and MV system coincidence
  
• kV and MV projection images
  
• Laser and light field coincidence
  
• Remote table adjustments

Used by a therapist every morning, testing takes little or no extra time and can be
completed during normal daily equipment warm-up procedures. Ideally, one
Penta-Guide phantom should be used per linac allowing simultaneous system testing
and preventing unnecessary start-up delays.