TABLE 3.

Dosimetric Data^a

Variable	n	Median (IQR)
First GKRS dose, Gy	152	90 (85–90)
To REZ	113	19.6 (11.1–54.8)
To petrous dura	96	22 (11.3–59.5)
To pons surface	113	40 (25.1–64.1)
Second GKRS dose, Gy	152	80 (80–85)
To REZ	124	18.6 (8.9–35.1)
To petrous dura	104	28.6 (12.7–56.7)
To pons surface	124	35 (21.2–50.9)
Distance from isocenter to landmarks at first GKRS, mm
REZ	95	4.6 (2.5–6.8)
Petrous dura	96	4.3 (2.4–5.8)
Pons surface	113	3.2 (2.2–4.2)
Distance from isocenter to landmarks at second GKRS, mm
REZ	103	4.7 (3.5–6.7)
Petrous dura	104	3.7 (2.4–5.4)
Pons surface	124	3.5 (2.7–4.4)

^aIQR, interquartile range; REZ, root entry zone; GKRS, Gamma Knife radiosurgery.