By G. Fredzell (auth.), Prof. Dr. H. Just, Prof. Dr. P. H. Heintzen (eds.)
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9, as feature extraction. This type of image processing is not only significant for visual image evaluation - in order to make the morphological information more conspicuous  - but can also be a preliminary stage for subsequent quantitative evaluation, as in the case of temporal or material-selective filtering . References 1. Kunnen M, DePinte (1972) Stereokino und Stereofernsehdurchleuchtung in der 2-Ebe- nen-Angiokardiographie. Vortrag AngiographiekongreB Salzburg 1972 2. Gimenez JL, Stewart GH, Lynch PR (1968) High speed (540 frames per second) biplane cineradiography.
Hofmann I would like to end this paper with some remarks on image intensifier field sizes. Until now, commercially available X-ray image intensifiers have had input field diameters of between 15 cm and 35 cm. The emerging trend toward indirect and digitized radiography may require larger fields. There is no principal technical impediment against building larger image intensifiers; it is only a question of cost and of increased demands on mechanical tolerances. To prove this, we have built a few experimental image intensifiers for taking indirect chest films on lOO-mm film (Fig.
5. A passband of about 5 MHz is allowed by the sampling frequency of more than 10 MHz. The nonlinear phase characteristics of a sharply band-limiting analog filter may, however, introduce some "ringing" which turns up as a decorrelation of nearest neighbors on a TV line in the performance of certain types of quantitative analysis. The quality of the digitization and image analysis process is, in addition to the above-mentioned considerations, determined by the degree of the temporal reproducibility of the three sampling processes.
Angiocardiography: Current Status and Future Developments by G. Fredzell (auth.), Prof. Dr. H. Just, Prof. Dr. P. H. Heintzen (eds.)