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Fiducial Registration Error (FRE in mm) in the clinical application with head fixation types A, B1, B2, C1 and C2. Data are presented as mean +/- standard deviation (n = 5 patients in B1 and B2; n = 10 patients in A, C1 and C2). FREs in types C1 and C2 were significantly higher than in control group (type A) (* p < 0,05, t test). There was no statistical difference between the two B-type (B1 vs. B2) and the two C-type (C1 vs. C2) procedures (n.s. = p > 0.05)
