Brand Name: RayStation -Intended as a Radiation Therapy Treatment Planning System Model/Catalog Number: 8.1.0.47, 8.1.1.8, 8.1.2.5, 9.0.0.113 and 9.0.1.142 Software Version: RayStation 8B, 8B Service Pack 1 and 2, 9A and 9A Service Pack 1

Reason: Inconsistency in the use of Density uncertainty in the RayStation functions Robust optimization, Robust evaluation and Compute perturbed dose for proton and light ion treatment plans when a HU-to-mass density CT calibration curve used in RayStation version 4.5 to 2024B including some service packs.

Code information: Lot Code: UDI: 0735000201011220180608, 0735000201013620180928, 0735000201017420190612 and 0735000201048820220420 GTIN: 07350002010112, 07350002010136, 07350002010174 and 07350002010488 Serial Numbers: 8.0.0.61, 8.0.1.10, 9.0.0.113 and 9.0.1.142 Software Revisions: RayStation 8B, 8B Service Pack 1 and 2, 9A and 9A Service Pack 1 Expiration Date: 2027-12-15

Distribution pattern: Worldwide distribution - US Nationwide and the countries of Australia, Austria, Belgium, Belgium ENG, Canada, China, China APactron, Denmark, France, Germany, Hong Kong S.A.R. China, India, Italy, Japan, Korea, Netherlands, Norway, Poland, Singapore, Spain, SwitzerlandENG, Taiwan, Thailand, UK.