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Proceedings Paper

Image quality of endoscopes
Author(s): Peter F. Niederer; Juerg Haefliger; Patrick Blessing; Yves Lehareinger; Daniel Doswald; Norbert Felber
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Paper Abstract

Medical endoscopy has become a key technology for the purposes of minimally invasive diagnostic and therapeutic procedures. With the aid of an endoscope, and external observation of a location inside the human body which may be difficult or dangerous to reach or which should be subjected to minimal traumatization associated with the intended medical treatment is facilitated through a viewing channel. A television camera is usually attached to the distal end of an endoscope for image presentation. Of primary importance for the user are image quality, ease of application and safety. This communication is primarily concerned with aspects relating to image quality. First, the optical properties of various types of endoscopes are analyzed and their spatial resolution is determined. Second, it is shown that the inherent optical quality in terms of spatial, temporal and contrast resolution of most endoscopes exceeds the performance limits of presently used standard TV systems in part substantially. Accordingly, a special purpose advanced digital television system exhibiting high spatial resolution, furthermore true color and high contrast dynamics has been developed. Since endoscopic images usually are circular, its aspect ratio is quadratic with a spatial resolution of 1000 x 1000 pixels. The framing rate is variable from 1 Hz to 30 Hz noninterlaced. Some design aspects and the performance of the system are shown and further applications are indicated.

Paper Details

Date Published: 19 January 2001
PDF: 10 pages
Proc. SPIE 4158, Biomonitoring and Endoscopy Technologies, (19 January 2001); doi: 10.1117/12.413778
Show Author Affiliations
Peter F. Niederer, Univ. of Zurich and Swiss Federal Institute of Technology Zurich (Switzerland)
Juerg Haefliger, Univ. of Zurich and Swiss Federal Institute of Technology Zurich (Switzerland)
Patrick Blessing, Univ. of Zurich and Swiss Federal Institute of Technology Zurich (Switzerland)
Yves Lehareinger, Univ. of Zurich and Swiss Federal Institute of Technology Zurich (Switzerland)
Daniel Doswald, Swiss Federal Institute of Technology Zurich (Switzerland)
Norbert Felber, Swiss Federal Institute of Technology Zurich (Switzerland)

Published in SPIE Proceedings Vol. 4158:
Biomonitoring and Endoscopy Technologies
Israel Gannot; Yuri V. Gulyaev; Theodore G. Papazoglou; Christiaan F. P. van Swol, Editor(s)

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