The authors used a frameless stereotactic navigation system, rite Vogele-Ba
le-Hohner head holder, and a targeting device to reproducibly position brac
hytherapy needles for fractionated interstitial brachytherapy in 12 patient
s with inoperable cancers of the head and neck. In all cases, deviations of
the needle relative to the planned position were within 1-15 mm depending
on the location of the tumor.