Accuracy testing of a new stereotactic CT-guided brain biopsy device in the dog

The accuracy testing of a new CT-guided stereotactic device was undertaken via an experimental study. Ten dog cadaver heads were submitted to a CT exa mination and a brain target was determined (coordinates: xl, yl, zl). 0.3 m i of a radiopaque paste was injected in this chosen point. The head was ana lysed twice by CT and the centre of the injection (x2, y2, z2) was measured on slices. Tridimensional statistical analysis of the variance of the two points was carried out. The procedure always led to the injection of the ra diopaque paste and created an intracerebral mass which gave a measurable im age on cr examination. The distance between the original target and the cen tre of the injection was 2.9 +/- 1.08 mm. It is concluded that this new dev ice allows the opportunity to perform stereotactic CT-guided brain biopsy f or all unknown brain lesions exceeding 6 mm in diameter in the dog.