By G. Fredzell (auth.), Prof. Dr. H. Just, Prof. Dr. P. H. Heintzen (eds.)
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Extra info for Angiocardiography: Current Status and Future Developments
This complex system combines a number of complete X-ray systems with a high speed digital processor system. Pfeiler (1981) has discussed some basic problems of this approach which may limit its applicability. Because of the reasons described above, only the techniques collectively named "digital fluorography" in Fig. 1 are left for routine angiocardiographic imaging. They are characterized by the following features: 1. Image acquisition using fluoroscopic system components (area beam radiation source, image intensifier, video camera).
1981; Waldman et al. 1981). These problems may in future be solved by digital implementations of image data acquisition and processing. The data rate and capacity may be decreased in the coding process and both these parameters, and in addition the radiation dose, might in certain applications be reduced by noise reducers or temporal low-pass filters. These topics are discussed in the following paragraphs. Presently, the typical imaging rate is 50/s or 60/s in video angiocardiography and the radiation pulse (aperture time) should not be wider than 2ms to avoid motion blurring and a widening of the X-ray spectrum (Heintzen 1971 b; HaendIe 1979).
The fan beam systems shown in the upper part of Fig. 1 offer the advantage of direct digital data acquisition and good contrast resolution due to the high PROCESSING ACQUISITION SOURCE DETECTION RECONSTRUCTION FROM PROJECT. COMPUTER TOMOGRAPHY ~ SCAN DYNAMIC SPATIAL RECONSTRUCTION FROM MULTIPLE PLANES TEMPORAL FEATURE EXTR. I. Modalities of digital radiographic imaging systems. These systems are compared with regard to the image acquisition mode used and the class of image processing methods typically applied 34 R.