Non-linear optical imaging and fibre-based spectroscopy of fresh colon biopsies

Year: 2012

Authors: Cicchi R., Sturiale A., Nesi G., Kapsokalyvas D., Tonelli F., Pavone FS.

Autors Affiliation: European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, 1 Via Nello Carrara, Sesto Fiorentino, Italy;
Department of Clinical Physiopathology, Surgical Unit, University of Florence, Florence, Italy;
Division of Human Pathology and Oncology, Department of Surgical and Medical Clinical Care,University of Florence, Florence, Italy

Abstract: Two-photon fluorescence (TPEF) microscopy is a powerful tool to image human tissues up to 200 microns depth without any exogenously added probe. TPEF can take advantage of the autofluorescence of molecules intrinsically contained in a biological tissue, as such NADH, elastin, collagen, and flavins. Two-photon microscopy has been already successfully used to image several types of tissues, including skin, muscles, tendons, bladder. Nevertheless, its usefulness in imaging colon tissue has not been deeply investigated yet. In this work we have used combined two-photon excited fluorescence (TPEF), second harmonic generation microscopy (SHG), fluorescence lifetime imaging microscopy (FLIM), and multispectral two-photon emission detection (MTPE) to investigate different kinds of human ex-vivo fresh biopsies of colon. Morphological and spectroscopic analyses allowed to characterize both healthy mucosa, polyp, and colon samples in a good agreement with common routine histology. Even if further analysis, as well as a more significant statistics on a large number of samples would be helpful to discriminate between low, mild, and high grade cancer, our method is a promising tool to be used as diagnostic confirmation of histological results, as well as a diagnostic tool in a multiphoton endoscope or colonoscope to be used in in-vivo imaging applications.

Conference title: Photonics West – BIOS 2012
Place: San Francisco, US

KeyWords: Autofluorescence; Biological tissues; Colon; Colon tissues; Diagnostic tools; Ex-vivo; Fluorescence lifetime imaging microscopy; Human tissues; In-Vivo imaging; Multi-spectral; Multiphotons; Non-linear optical; Number of samples; Second harmonic generation microscopies (SHG); Two photon; Two photon fluorescence; Two photon microscopy; Two-photon emission; Two-photon excited fluorescence, Biopsy; Fluorescence; Health care; Histology; Photonics; Photons; Spectroscopic analysis; Tissue, Fluorescence microscopy
DOI: 10.1117/12.922388

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