PubMed · 6869162
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J T Rhea, S A DeLuca. 1983. Pathologic intracranial calcifications.. https://pubmed.ncbi.nlm.nih.gov/6869162/
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This publication is literally the same paper (having the same title and image material) which was previously presented at the International Symposium on Stereotactic Neuro-Radio-Surgery (Vienna, October 1992). Any actual updating of the topic has been avoided for reasons of historical accuracy and in order to document the atmosphere of that symposium which was then dominated by the unfolding of a new technology of intracranial lesion treatment. The neuroradiologist's contribution to this modality of treatment has to be the imaging and localizing such lesions accurately, as well as advising colleagues who plan radiosurgery and warning them about possible pitfalls. If there is no close cooperation between radiosurgeons and neuroradiologists, or if neuroradiological assistance is even disregarded, radiosurgical activities may fail.
The adaptation of computerized tomography for stereotactic operations requires the transformation of the coordinates of the target point from the CT image space into the stereotactic frame space. Two basic solutions for this transformation are realized in the most of the contemporary stereotactical systems. The indirect geometric method adjusts the frame coordinate system mechanically and identifies its origin in the CT image. There are 6 degrees of freedom: 3 of rotation and 3 of translation which have to be taken into consideration. The second method is a based on direct algebraic coordinate transformation and is independent of the explicite knowledge of the relationship between the image and the frame space. A localization frame serves to determine a transformation matrix which, applied to any point in the image, transforms the coordinates directly into the frame coordinate system. Only the algebraic method is independent of the position of the patient in the gantry. All other methods require high mechanical precision of the alignment and stability for the CT table.