Mevion has launched a new proton therapy system called S250-Fit that can fit in existing linac vaults for better accessibility and affordability.
S250-Fit features Mevion's Hyperscan pencil beam scanning for intensity modulated proton therapy (IMPT), dual-energy large bore diagnostic CT at treatment position for image-guided radiotherapy (IGRT) and adaptive therapy, and Flash research capabilities. It is also designed to support access to emerging technologies like volumetric modulated arc therapy (VMAT).
Mevion is developing the system in partnership with Leo Cancer Care, a medical device company based in Middleton, WI, it said.
![Axial images from unenhanced calcium score cardiac CT (left) and curved planar reformation images from CT angiography (right) show that higher long-term exposure to air pollution is associated with greater coronary artery calcium and more obstructive coronary artery disease (CAD). Top row: Images in a 68-year-old male patient with higher 10-year mean ambient air pollution exposure (7.9 μg/m3 for particulate matter measuring ≤2.5 μm in diameter [PM2.5] and 17.4 parts per billion [ppb] for NO2) with extensive CAD (coronary artery calcium score [CACS] >1,000 and obstructive CAD [≥70% diameter stenosis]). Bottom row: Images in a 57-year-old female patient with lower 10-year mean ambient air pollution exposure (6.3 μg/m3 for PM2.5 and 4.6 ppb for NO2) with no CAD (CACS = 0 and no obstructive stenosis).](https://img.auntminnie.com/mindful/smg/workspaces/default/uploads/2026/06/hanneman.r6SMLzkezo.png?auto=format%2Ccompress&dpr=2&fit=crop&h=167&q=70&w=250)
