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Technology Overview
Elekta VMAT utilizes state-of-the-art treatment planning and delivery technologies that offer clinicians maximum flexibility for creating high-conformal dose plans. Treatment Planning Treatment planning for Elekta VMAT follows a similar approach to planning for conventional IMRT. But only Elekta VMAT can all can be delivered using a single arc, multiple arcs, partial arcs, or a combination there of— the physician chooses what is best for the patient. Elekta VMAT planning is completed using the ERGO++ treatment planning system, which includes the Arc Modulation Optimization Algorithm (AMOA) for creating VMAT plans. (Elekta VMAT is also compatible with third-party treatment planning applications.) Single Arc During single-arc VMAT treatments, all delivery parameters are modulated during a single rotation of the linac – up to 360 degrees. The resulting treatment is a highly conformal dose distribution delivered in as fast as two minutes. Single arc treatments are well suited to tumor sites such as the prostate, where opportunity exists to reduce unwanted dose to surrounding healthy tissues and adjacent critical structures. Single Arc VMAT Plan Compared to 7-Field IMRT Plan 
Treatment plan courtesy of William Beaumont Hospital.
Single Arc and Multiple Arc VMAT Plan Compared to 7-Field IMRT Plan
Treatment plan courtesy of William Beaumont Hospital.
Treatment Delivery • Gantry position
• Step and Shoot – Current IMRT treatments vary the MU per degree by stopping gantry rotation during treatment delivery, which lengthens treatment time. Additionally, IMRT plans consist of several fields, or control points. VMAT effectively has an unlimited number of fields.
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