[Neuroradiologic detail diagnosis--magnification angiography].

The basis of a radiological enlargement techniques is the ultra-fine focus roentgen tube. By approaching the part of the body to be examined to the source of the X-rays it is now possible to obtain an image enlargement with a good discernability of details. Limiting factors are the higher radiation exposure of the patient and the existing limits of the resolving power. The purpose of the technique is the clear and essential improvement of the discernability of details which are already seen in conventional angiography rather than the representation of structures invisible until now. That is why the author always employs the magnification angiography after the usual angiography. If the latter does not yield a sufficient visualisation of details (e.g. supply of the vessels of certain tumours, vessels of the stem ganglia and the like) and the increased radiation exposure can be put up with, the enlargement technique is the used. An ultra-fine focus of 0.3 mm edge length, a focus-film distance of 100 cm, and a focus-object distance of 45 cm are used. The image scale is doubled to reach 2.25. The additional information obtained in angiotomography is pointed out.