The design of cerebral angiographic equipment had not sufficiently progressed to consider reducing the needless manual requirements of the radiologic technologist for realigning tubes and changers about the patient continuously.
Lack of a light weight, reliable, satisfactory detail serial film changer.
Even recently developed concentric (Mimer °°, Princeps °°°, Neurocentrix °°°) and isocentric (Neurodiagnost °°°°) pneumoencephalographic systems which allow for cerebral angiography use a mechanized C-arm or ring rotational movements. These movements do not provide cephalo — caudal tube projections onto an orthogonally positioned changer while obtaining compound angulations.
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