Table 2. Monte Carlo (MC) simulations to determine average Root Mean Square Errors (RMS-e) were computed across the entire volume enclosed by the N-localizer system for various heights subtended by the Brown-Roberts-Wells (BRW) localizer frame (LF). RMS-e decreases with increasing the width/height ratio. The BRW LF (standard) is the commercial version, whereas the other versions are modified in only the vertical dimension.

Millimeter (mm)

Root Mean Square Error (RMS-e)

BRW, Radionics CRW Stereotactic System, Integra LifeSciences Corporation, Plainsboro, New Jersey

Localizer	Width (mm)	Height (mm)	Width/Height	Average RMS-e Whole space (9 rods)
BRW LF (standard)	140	189	0.741	0.512 (+/- 0.014)
BRW LF (modified)	140	160	0.875	0.451 (+/- 0.011)
BRW LF (modified)	140	140	1	0.410 (+/- 0.010)
BRW LF (modified)	140	120	1.167	0.372 (+/- 0.008)