Lifetime-based tomographic multiplexing

Scott B. Raymond; David A. Boas; Brian J. Bacskai; Anand T. N. Kumar

doi:10.1117/1.3469797

1 July 2010 Lifetime-based tomographic multiplexing

Scott B. Raymond, David A. Boas, Brian J. Bacskai, Anand T. N. Kumar

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Journal of Biomedical Optics, Vol. 15, Issue 4, 046011 (July 2010). https://doi.org/10.1117/1.3469797

Abstract

Near-infrared (NIR) fluorescence tomography of multiple fluorophores has previously been limited by the bandwidth of the NIR spectral regime and the broad emission spectra of most NIR fluorophores. We describe in vivo tomography of three spectrally overlapping fluorophores using fluorescence lifetime-based separation. Time-domain images are acquired using a voltage-gated, intensified charge-coupled device (CCD) in free-space transmission geometry with 750 nm Ti:sapphire laser excitation. Lifetime components are fit from the asymptotic portion of fluorescence decay curve and reconstructed separately with a lifetime-adjusted forward model. We use this system to test the in vivo lifetime multiplexing suitability of commercially available fluorophores, and demonstrate lifetime multiplexing in solution mixtures and in nude mice. All of the fluorophores tested exhibit nearly monoexponential decays, with narrow in vivo lifetime distributions suitable for lifetime multiplexing. Quantitative separation of two fluorophores with lifetimes of 1.1 and 1.37 ns is demonstrated for relative concentrations of 1:5. Finally, we demonstrate tomographic imaging of two and three fluorophores in nude mice with fluorophores that localize to distinct organ systems. This technique should be widely applicable to imaging multiple NIR fluorophores in 3-D.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Scott B. Raymond, David A. Boas, Brian J. Bacskai, and Anand T. N. Kumar "Lifetime-based tomographic multiplexing," Journal of Biomedical Optics 15(4), 046011 (1 July 2010). https://doi.org/10.1117/1.3469797

Published: 1 July 2010

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