RaySearch RayStation 3.5, RayStation 4.0, RayStation 4.5, and RayStation 4.7 (Radiation therapy treatment planning system) 의 리콜

Recall

RC-2015-RN-00207-1

Class II

2015-03-19

Australia

DHTGA

https://apps.tga.gov.au/Prod/sara/arn-detail.aspx?k=RC-2015-RN-00207-1

The issue concerns an error in dynamic multileaf collimator (dmlc) dose calculation for machines where the mlc is positioned above the jaws or the jaws are fixed. the output factor correction is computed from the irradiated area of the first control point but is applied to the entire beam. if the irradiated areas of the remaining control points are significantly different from the initial area, the output factor correction used for these control points will be incorrect.The maximum possible error in dose corresponds to the span of the output factor corrections of the beam model. for example, if the output factor corrections span 0.95-1.05, the maximum theoretical error is 10%, although for most plans, the error would be less.Machines that have backup jaw and the mlc below non-fixed jaws (e.G. varian linacs) and linacs that do not have backup jaw (e.G. siemens linacs and elekta agility) are not affected.

DMLC dose calculation for the affected linac types will be turned off in patch version 4.7.1 of RayStation, scheduled for market release April 2015. In the meantime, users are advised that if DMLC has been in use for affected linac types, review the beam models. The possible error in dose depends on the span of the output factor corrections. Deprecate any beam models that have been commissioned as DMLC capable for the affected linac types. Does not commission beam models as DMLC capable for the affected linac types.