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dc.contributor.authorWu, Rengmao
dc.contributor.authorQin, Yi
dc.contributor.authorHua, Hong
dc.date.accessioned2016-11-10T20:02:27Z
dc.date.available2016-11-10T20:02:27Z
dc.date.issued2016-05-18
dc.identifier.citationImproved illumination system of laparoscopes using an aspherical lens array 2016, 7 (6):2237 Biomedical Optics Expressen
dc.identifier.issn2156-7085
dc.identifier.issn2156-7085
dc.identifier.doi10.1364/BOE.7.002237
dc.identifier.urihttp://hdl.handle.net/10150/621347
dc.description.abstractThe current fiber-based illumination systems of laparoscopes are unable to uniformly illuminate a large enough area in abdomen due to the limited numerical aperture (NA) of the fiber bundle. Most energy is concentrated in a small region at the center of the illumination area. This limitation becomes problematic in laparoscopes which require capturing a wide field of view. In this paper, we propose an aspherical lens array which is used to direct the outgoing rays from the fiber bundle of laparoscope to produce a more uniformly illuminated, substantially larger field coverage than standalone fiber source. An intensity feedback method is developed to design the aspherical lens unit for extended non-Lambertian sources, which is the key to the design of this lens array. By this method, the lens unit is obtained after only one iteration, and the lens array is constructed by Boolean operation. Then, the ray-tracing technique is used to verify the design. Further, the lens array is fabricated and experimental tests are performed. The results clearly show that the well-illuminated area is increased to about 0.107m2 from 0.02m2 (about 5x larger than a standard fiber illumination source). More details of the internal organs can be clearly observed under this improved illumination condition, which also reflects the significant improvement in the optical performance of the laparoscope.
dc.description.sponsorshipThis work is funded by the National Institute of Biomedical Imaging and Bioengineering (NIBIB) (grant no. 1R01EB18921).en
dc.language.isoenen
dc.publisherThe Optical Society of Americaen
dc.relation.urlhttps://www.osapublishing.org/abstract.cfm?URI=boe-7-6-2237en
dc.rights© 2016 Optical Society of Americaen
dc.titleImproved illumination system of laparoscopes using an aspherical lens arrayen
dc.typeArticleen
dc.contributor.department3DVIS Lab, College of Optical Sciences, University of Arizonaen
dc.identifier.journalBiomedical Optics Expressen
dc.description.noteOpen access journal.en
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
dc.internal.reviewer-noteBiomedical Optics Express is an open access journal.en
refterms.dateFOA2018-04-25T16:37:22Z
html.description.abstractThe current fiber-based illumination systems of laparoscopes are unable to uniformly illuminate a large enough area in abdomen due to the limited numerical aperture (NA) of the fiber bundle. Most energy is concentrated in a small region at the center of the illumination area. This limitation becomes problematic in laparoscopes which require capturing a wide field of view. In this paper, we propose an aspherical lens array which is used to direct the outgoing rays from the fiber bundle of laparoscope to produce a more uniformly illuminated, substantially larger field coverage than standalone fiber source. An intensity feedback method is developed to design the aspherical lens unit for extended non-Lambertian sources, which is the key to the design of this lens array. By this method, the lens unit is obtained after only one iteration, and the lens array is constructed by Boolean operation. Then, the ray-tracing technique is used to verify the design. Further, the lens array is fabricated and experimental tests are performed. The results clearly show that the well-illuminated area is increased to about 0.107m2 from 0.02m2 (about 5x larger than a standard fiber illumination source). More details of the internal organs can be clearly observed under this improved illumination condition, which also reflects the significant improvement in the optical performance of the laparoscope.


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