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Multiphoton induced fluorescence and second harmonic imaging of drug-eluted arterial walls for non-invasive photo-polymerizable stents (Conference Presentation)
Author(s): Tochukwu Emeakaroha; Divya Kota; Sam Young; Ron Utecht; Steve J. Smith

Paper Abstract

We developed a spectrally-resolved multi-photon imaging system, based on a closed loop piezoelectric sample scanning stage, a transmission grating and an EMCCD. The method allows detailed analysis of the spectrally-resolved signals, including deconvolution of the resulting emission peaks, and precise differentiation of the resulting signals. The system also makes available the possibility of using point spread function analyses, such as pixel reassignment, Airy scan and full three-dimensional, spectral imaging. We present multi-photon induced fluorescence, second harmonic and fluorescence lifetime imaging analysis supporting the development of non-invasive photo-polymerizable scaffolds for treatment of peripheral artery disease. Currently, the technology, developed by Alumend, LLC, is undergoing clinical trials and is licensed by Alucent Medical. In this work we report a comparison of the second harmonic generation and two photon induced fluorescence imaging in drug-infused arteries, and compare these to fluorescence lifetime images obtained using our commercial (Picoquant) fluorescence lifetime imaging system. Primary signals from the endogenous fluorescence from the drug and the second harmonic generation, prevalent in collagen, are compared. Of particular interest, we observe the photo-chemical modification of the drug fluorescence emission energy and lifetime in the adventitia, composed primarily of collagen. The drug aids in cross-linking the compressed collagen fibrils in the arterial wall during the light activation step, which leads to formation of the stent.

Paper Details

Date Published: 4 March 2019
Proc. SPIE 10882, Multiphoton Microscopy in the Biomedical Sciences XIX, 1088216 (4 March 2019); doi: 10.1117/12.2510248
Show Author Affiliations
Tochukwu Emeakaroha, South Dakota School of Mines and Technology (United States)
Divya Kota, South Dakota School of Mines and Technology (United States)
Sam Young, Alumend, LLC (United States)
Ron Utecht, Alumend, LLC (United States)
Steve J. Smith, South Dakota School of Mines and Technology (United States)

Published in SPIE Proceedings Vol. 10882:
Multiphoton Microscopy in the Biomedical Sciences XIX
Ammasi Periasamy; Peter T. C. So; Karsten König, Editor(s)

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