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Proceedings Paper

Quantitative assessment of degradation of the optical quality of rigid endoscopes in clinical practice
Author(s): Herke Jan Noordmans; Sander Kruit; Patrick Stroosnijder; Henk van den Brink; Rudolf Verdaasdonk
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Paper Abstract

To improve efficiency and diagnostics, an optical testbench was developed for routine assessment of the optical quality of endoscopes during their lifespan. An endoscope is positioned on an optical bench looking at a small LCD screen showing computer generated test targets. Images through the endoscope are captured by a high-resolution USB-2 camera, analyzed with dedicated software and stored in a database. Additionally, the transmission of the illumination fibers of the endoscope is determined using a calibrated LED light source and a photo cell. The database enables the tracking of the degradation of each endoscope over time and comparison with other endoscopes of the same type. Using the data collected and the optical quality of new endoscopes as reference, criteria are developed to reject endoscopes at some point in their lifespan. Experience with the optical testbench over the last two years shows that: 1) Optical quality can be measured reproducible over time, 2) degradation in optical quality is often gradually, but may also occur suddenly, and 3) there is a large variation (>20%) in optical quality of new or repaired endoscopes. Routine quantitative assessment of the optical quality of endoscopes will contribute to the efficiency and the quality of surgery.

Paper Details

Date Published: 12 February 2008
PDF: 8 pages
Proc. SPIE 6849, Design and Quality for Biomedical Technologies, 68490K (12 February 2008); doi: 10.1117/12.763562
Show Author Affiliations
Herke Jan Noordmans, Univ. Medical Ctr. Utrecht (Netherlands)
Sander Kruit, Univ. Medical Ctr. Utrecht (Netherlands)
Patrick Stroosnijder, Univ. Medical Ctr. Utrecht (Netherlands)
Henk van den Brink, Univ. Medical Ctr. Utrecht (Netherlands)
Rudolf Verdaasdonk, Univ. Medical Ctr. Utrecht (Netherlands)

Published in SPIE Proceedings Vol. 6849:
Design and Quality for Biomedical Technologies
Ramesh Raghavachari; Rongguang Liang, Editor(s)

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