Good topic on the Medphys list server.
Scott Dube posted this link to a good paper on the topic and gave the following commentary:
QUESTION:
What is the rationale behind cranial SRS prescriptions lines laying
> somewhere around 80-90%??
The dose falloff outside the target is steeper when you prescribe to 80%.
This paper even recommends 70%.
http://www.ncbi.nlm.nih.gov/pubmed/22422384
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