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Proceedings Paper

Development of a laparoscope with multi-resolution foveation capability for minimally invasive surgery
Author(s): Yi Qin; Hong Hua; Mike Nguyen
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Paper Abstract

Laparoscope is the essential tool for minimally invasive surgery (MIS) within the abdominal cavity. However, the focal length of a conventional laparoscope is fixed. Therefore, it suffers from the tradeoff between field of view (FOV) and spatial resolution. In order to obtain large optical magnification to see more details, a conventional laparoscope is usually designed with a small working distance, typically less than 50mm. Such a small working distance limits the field of coverage, which causes the situational awareness challenge during the laparoscopic surgery. We developed a multi-resolution foveated laparoscope (MRFL) aiming to address this limitation. The MRFL was designed to support a large working distance range from 80mm to 180mm. It is able to simultaneously provide both wide-angle overview and high-resolution image of the surgical field in real time within a fully integrated system. The high-resolution imaging probe can automatically scan and engage to any subfield of the wide-angle view. During the surgery, MRFL does not need to move; therefore it can reduce the instruments conflicts. The FOV of the wide-angle imaging probe is 80° and that of the high-resolution imaging probe is 26.6°. The maximum resolution is about 45um in the object space at an 80mm working distance, which is about 5 times as good as a conventional laparoscope at a 50mm working distance. The prototype can realize an equivalent 10 million-pixel resolution by using only two HD cameras because of its foveation capability. It saves the bandwidth and improves the frame rate compared to the use of a super resolution camera. It has great potential to aid safety and accuracy of the laparoscopic surgery.

Paper Details

Date Published: 13 March 2013
PDF: 7 pages
Proc. SPIE 8573, Design and Quality for Biomedical Technologies VI, 857309 (13 March 2013); doi: 10.1117/12.2005180
Show Author Affiliations
Yi Qin, College of Optical Sciences, The Univ. of Arizona (United States)
Hong Hua, College of Optical Sciences, The Univ. of Arizona (United States)
Mike Nguyen, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 8573:
Design and Quality for Biomedical Technologies VI
Ramesh Raghavachari; Rongguang Liang, Editor(s)

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