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Endoscopic Fluorescence Lifetime Imaging for In Vivo Intraoperative Diagnosis of Oral Carcinoma

Published online by Cambridge University Press:  23 May 2013

Yinghua Sun ,
Jennifer E. Phipps ,
Jeremy Meier ,
Nisa Hatami ,
Brian Poirier ,
Daniel S. Elson ,
D. Gregory Farwell  and
Laura Marcu
Yinghua Sun
Affiliation:
Department of Biomedical Engineering, University of California, Davis, CA 95616, USA
Jennifer E. Phipps
Affiliation:
Department of Biomedical Engineering, University of California, Davis, CA 95616, USA
Jeremy Meier
Affiliation:
Department of Otolaryngology-Head and Neck Surgery, University of California Davis, Sacramento, CA 95817, USA
Nisa Hatami
Affiliation:
Department of Biomedical Engineering, University of California, Davis, CA 95616, USA
Brian Poirier
Affiliation:
Department of Pathology, University of California Davis, Sacramento, CA 95817, USA
Daniel S. Elson
Affiliation:
Department of Surgery, Hamlyn Centre, Imperial College London, London SW7 2AZ, UK
D. Gregory Farwell
Affiliation:
Department of Otolaryngology-Head and Neck Surgery, University of California Davis, Sacramento, CA 95817, USA
Laura Marcu*
Affiliation:
Department of Biomedical Engineering, University of California, Davis, CA 95616, USA
*
*Corresponding author. E-mail: lmarcu@ucdavis.edu
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Abstract

A clinically compatible fluorescence lifetime imaging microscopy (FLIM) system was developed. The system was applied to intraoperative in vivo imaging of head and neck squamous cell carcinoma (HNSCC). The endoscopic FLIM prototype integrates a gated (down to 0.2 ns) intensifier imaging system and a fiber-bundle endoscope (0.5-mm-diameter, 10,000 fibers with a gradient index lens objective 0.5 NA, 4-mm field of view), which provides intraoperative access to the surgical field. Tissue autofluorescence was induced by a pulsed laser (337 nm, 700 ps pulse width) and collected in the 460 ± 25 nm spectral band. FLIM experiments were conducted at 26 anatomic sites in ten patients during head and neck cancer surgery. HNSCC exhibited a weaker florescence intensity (~50% less) when compared with healthy tissue and a shorter average lifetime (τHNSCC = 1.21 ± 0.04 ns) than the surrounding normal tissue (τN = 1.49 ± 0.06 ns). This work demonstrates the potential of FLIM for label-free head and neck tumor demarcation during intraoperative surgical procedures.

Keywords

fluorescence lifetime imaging microscopy (FLIM)tissue autofluorescenceendoscopyhead and neck squamous cell carcinoma (HNSCC)cancer diagnosisintraoperative diagnosis
Type
Omaha Imaging Symposium
Information
Microscopy and Microanalysis , Volume 19 , Issue 4 , August 2013 , pp. 791 - 798
Copyright
Copyright © Microscopy Society of America 2013 

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