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Proceedings Paper

Imaging melanin by two-photon absorption microscopy
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Paper Abstract

Multiphoton excitation fluorescence microscopy has proven to be a powerful method for non-invasive, in vivo, thick tissue imaging with molecular specificity. However, many important endogenous biomolecules do not fluoresce (NAD) or fluoresce with low efficiency (Melanin). In this report femtosecond pulse shaping methods are used to measure two-photon absorption (TPA) directly with very high sensitivity. Combining with the laser scanning microscope, this Two-photon Absorption Microscopy (TPAM) retains the penetration and localization advantages of two-photon fluorescence microscopy and permits direct observation of important endogenous molecular markers (melanin or hemoglobin) which are invisible in multiphoton fluorescence microscopy. We have demonstrated here for the first time that TPAM can successfully and more efficiently image melanoma cells and tissues and provide a good melanin contrast in optical sectioning of the melanoma lesions which are comparable to pathological histology. Combining with the two-photon fluorescence images acquired simultaneously, the distribution patterns of the melanocytes and their intratissue behavior could be studied without cutting the lesions from patients. TPAM will undoubtedly find the applications in the clinical diagnosis and biomedical research.

Paper Details

Date Published: 23 February 2006
PDF: 7 pages
Proc. SPIE 6089, Multiphoton Microscopy in the Biomedical Sciences VI, 60891X (23 February 2006); doi: 10.1117/12.646139
Show Author Affiliations
Tong Ye, Duke Univ. (United States)
Gunay Yurtsever, Duke Univ. (United States)
Martin Fischer, Duke Univ. (United States)
John D. Simon, Duke Univ. (United States)
Warren S. Warren, Duke Univ. (United States)
Univ. of Pennsylvania (United States)

Published in SPIE Proceedings Vol. 6089:
Multiphoton Microscopy in the Biomedical Sciences VI
Ammasi Periasamy; Peter T. C. So, Editor(s)

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