RayStation 4.5, RayStation 4.7, RayStation 5, RayStation 6 and RayStation 7, a stand-alone software treatment planning system.
Robust optimization for plans using beam set + background dose is not supported in RayStation 4.5, RayStation 4.7, RayStation 5, RayStation 6 and RayStation 7.
Nationwide
https://www.accessdata.fda.gov/scripts/ires/index.cfm?Product=Z-0294-2019