A training model head of plaster of Paris for stereotactic localization.

Background: A head model for experiencing stereotactic localization will supply familiarity with stereotactic instruments and self confidence for attempters of stereotaxy before real experience.

Method: Plaster of Paris was molded as a model head in a plastic ball. Then, it was partly chipped at its superior half, and metal pieces were inserted into those chipped surfaces. Later, the stereotactic frame was applied, and axial computed tomographic scanning was obtained. The metal pieces seen on scans were selected as targets, and their coordinates were calculated using the software of the stereotactic equipment. Lastly, the stereotactic needle was introduced with these coordinates for investigation of targeting.

Results: The model of plaster of Paris head was very suitable for rigid frame fixation. The metal pieces in the model head were clearly observed on computed tomographic scans. The stereotactic biopsy needle introduced with the perviously calculated coordinates was always successful in true targeting.

Conclusion: This easily performed model head supplied us with familiarity with our stereotactic apparatus and convinced us for further attempts. This kind of model and more complicated ones may help for stereotaxy training in neurosurgery.