Cochlear sparing in LINAC-based radiosurgery for vestibular schwannoma: a dosimetric comparison of dynamic conformal arc, IMRT and VMAT treatment plans

Table 5 Subgroup analysis by treatment technique: mean difference in cochlear D_0.03cc and cochlear D_mean by distance from fundus

Technique	Cochlear dosimetric parameter	Mean difference per distance (Gy/mm) (95% CI)	Global P value
DCAT	Cochlea D_0.03cc	− 0.59 (− 0.95, − 0.22)	0.0035
IMRT	Cochlea D_0.03cc	− 1.0 (− 1.44, − 0.57)	0.0002
VMAT	Cochlea D_0.03cc	− 0.73 (− 1.04, − 0.43)	0.0001
DCAT	Cochlea D_mean	− 0.54 (− 0.89, − 0.20)	0.0038
IMRT	Cochlea D_mean	− 0.92 (− 1.30, − 0.54)	0.0001
VMAT	Cochlea D_mean	− 0.67 (− 0.95, − 0.38)	0.0001

ISSN: 1748-717X