Brand Name: RayStation -Intended as a Radiation Therapy Treatment Planning System Model/Catalog Number: 9.1.0.933, 9.2.0.483, 10.0.0.1154, 10.0.1.52 and 10.0.2.10 Software Version: RayStation 9B, 9B Service Pack 1, 10A, 10A Service Pack 1 and 2

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: 0735000201026620191220, 0735000201029720200310, 0735000201030320200526, 0735000201036520200526 and 0735000201065520220608 GTIN: 07350002010266 and 07350002010297, 07350002010303, 07350002010365 and 07350002010655 Serial Numbers: 9.1.0.933, 9.2.0.483, 10.0.0.1154, 10.0.1.52 and 10.0.2.10 Software Revisions: RayStation 9B, 9B Service Pack 1, 10A, 10A Service Pack 1 and 2 Expiration Date: 2025-06-16

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.