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American Journal of Roentgenology, Vol 143, Issue 3, 447-454
Copyright © 1984 by American Roentgen Ray Society

Articles

Digital subtraction angiography: principles and pitfalls of image improvement techniques

DC Levin, RM Schapiro, LM Boxt, L Dunham, DP Harrington, and DL Ergun

The technology of imaging methods in digital subtraction angiography (DSA) is discussed in detail. Areas covered include function of the video camera in both interlaced and sequential scan modes, digitization by the analog-to-digital converter, logarithmic signal processing, dose rates, and acquisition of images using frame integration and pulsed-sequential techniques. Also discussed are various methods of improving image content and quality by both hardware and software modifications. These include the development of larger image intensifiers, larger matrices, video camera improvements, reregistration, hybrid subtraction, matched filtering, recursive filtering, DSA tomography, and edge enhancement.
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