RayStation Radiation Therapy Treatment Planning System; -- RayStation 3.5, RayStation 4.0, RayStation 4.5 and RayStation 4.7. For RayStation 4.7, the issue applies also to machines with fixed jaws, regardless of MLC/jaw position. RayStation is a software system designed for treatment planning and analysis of radiation therapy.

An issue with photon dose calculation for DMLC (Dynamic MLC) plans for machines where the MLC is positioned above the jaws, e.g. some Elekta linacs. The magnitude of the error depends on the beam model output factor corrections and on the individual DMLC plan characteristics.

The firm, Raysearch Laboratories, sent a "Medical Device Correction/Field Safety Notice" and Reply Form(dated 3/3/2015) on 3/4/2015 via e-mail to the affected customers. The notice describes the product, problem and actions to be taken. The customers were instructed to deprecate any beam models that have been commissioned as DMLC capable for the affected linac types; do not commission beam models as DMLC capable for the affected linac types; educate physics staff and all users; inspect your system and identify all affected units of RayStation, acknowledge this notice by email or complete and return the Reply Form via fax to Americas market, RaySearch Americas Inc., at 888 501 7195, email: [email protected] or Rest of the world, RaySearch Laboratories AB, to email [email protected]. If you have any questions, contact Quality and Regulatory Affairs Manager, at +46 722 366 110 or email [email protected].