Graf/Pen computer for rapid neuroangiographic measurements: Sylvian loops and venous angle

The Graf/Pen sonic digitilizer facilitates routine application of neuroradiologic measurements during film interpretation. The Vlahovitch and Probst measurements were performed 23 times faster with this device than manually. The Graf/Pen computer combination shows great potential in the rapid quantitative analysis of both carotid and vertebral angiograms.