QUASAR™ IsoCenter Cube Phantom

The QUASAR™ IsoCenter Cube is designed to implement a modified Winston-Lutz test for IGRT accuracy required for optimal treatment delivery. This system is also used for TG-142 quality assurance compliance for isocenter and laser alignment tests.

End-to-end positioning accuracy from planning CT to clinical IGRT treatment setup is achieved with 0.1 mm precision and is accomplished in minutes. The test is performed by aligning the QUASAR™ IsoCenter Cube phantom using the cross-hairs etched on each side with your IGRT system, then capturing radiation field exposures with film or EPID. The test results are used to determine end-to-end isocenter accuracy for frameless SRS, SBRT, and IGRT treatments.