The use of robotic stereotactic system in the field of medicine is every day more intense. The development of new technologies has enabled the use of robots in stereotactic neurosurgical procedures where the demand for accuracy and precision is under millimeter. For every new system before it can be used it is necessary to measure the accuracy on the phantom which simulates the head of the patient. Phantoms developed for the measurement of the stereotactic procedures must give the exact replica of planed trajectories in stereotactic procedures. In the context of this paper it’s given in detail the overview of the field of robotized stereotactic neurosurgery throughout history till today. The systemized classification is made of the phantoms according to system they were used on to measure the overall accuracy which are then mutually compared. Based on the facts obtained from research of the current phantoms as well the ones used in the RONNA project (robotic neuronavigation) a new phantom is developed, a T phantom (trajectories phantom) for the measurement of accuracy and precision of robotic stereotactic systems for neurosurgery. The named phantom has the ability to simultaneously measure all of the dimensions of stereotactic and neuronavigational procedures. It is possible to measure spatial deviations in target and entry points. For the purpose of measuring, optic measurement method is developed which has the possibility to measure the translational deviation in target and entry points as well as the overall angular deviations from the ideal straight line for all of trajectories on the phantom developed optic method has been tested on the prototype of the developed phantom. Phantom and the measuring method where found suitable for further measurement on the RONNA system.