[Digital image intensifier radiography--application in angiography, urography and bone diagnosis].

In a retrospective study, the clinical usefulness of digital image intensifier radiography was analysed. It could be demonstrated that for angiographic procedures the image quality of a 1024(2) matrix is superior to a 512(2) matrix. For digital excretory urography it could be seen that in 80 to 90% the images were at least sufficient to analyse the renal pelvis.

[Nuclear magnetic resonance tomography of superior vena cava obstruction].

The potential of magnetic resonance tomography (MRT) to demonstrate the mediastinal veins was evaluated retrospectively in 6 patients with superior vena cava obstruction. In each instance, MRT provided detailed information about the extent of venous obstruction and the precise site of the causative oncological pathology. Transaxial images most clearly and unequivocally depicted obstructed superior vena cava.

[Rapid nuclear magnetic resonance tomography. Initial results of studies using the new gradient echo sequence].

In 60 patients with intracerebral lesions, examined by MRI, a new gradient-echo sequence was employed. This imaging technique uses excitation pulse angles smaller than 90 degrees and echoes are produced by an inversion of the read gradient. Since no 180 degrees pulse between successive excitations is necessary, very short repetition times can be used.

[Cystic changes of the posterior cranial fossa on the nuclear magnetic resonance tomogram].

MR images were obtained in 15 patients with cystic lesions in the posterior fossa and the results compared with computed tomography (CT). The abnormalities imaged included 5 epidermoids, 3 haemangioblastomas, 4 arachnoid cysts, 1 postoperative cyst, and 4 large cisterns. One advantage of MR is the ability to demonstrate lesions in three planes and without artifacts.