Patient specific quality assurance using sunnuclear arccheck for RapidArc treatments delivered on varian halcyon linear accelerator

Halcyon is an innovative new ring mounted linear accelerator designed by Varian Medical Systems, USA. South East Asia's First Halcyon was Installed, Acceptance Tested, Type Approved and Licensed for patient treatment at Sterling Cancer Hospitals, Rajkot. The machine has a gantry rotation speed of 4 rotations per minute (4 RPM) and MLC speed of 5 cm/sec. Also, the MLC has an innovative dual layer design with 28 pairs of distal and 29 pairs of proximal leaves. The proximal MLC leaves also participate in the fluence distribution to create an effective 5 mm fluence delivery resolution. With all the new design and technology, the patient specific qa is an integral part of evaluation for every patient