SRS was performed on the Leksell Gamma Knife Model C (Elekta, Stockholm, Sweden) prior to May 2009, and Perfexion after May 2009. Same day headframe fixation was used for immobilization. Patients underwent a contrast-enhanced stereotactic magnetic resonance imaging scan of the brain with headframe in place. The GammaPlan Treatment Planning System (AB Elekta, Stockholm, Sweden) was used to develop the treatment plan. Median marginal dose prescribed was 18–22 Gy and was generally prescribed to the 50% isodose line. The dose selected was based on guidelines previously described by Shaw et al.19 (link). The targeting of the resection cavity of the metastasis was previously described by Jensen et al.20 (link).
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