Compressive hyperspectral time-resolved wide-field fluorescence lifetime imaging

Journal name:
Nature Photonics
Volume:
11,
Pages:
411–414
Year published:
DOI:
doi:10.1038/nphoton.2017.82
Received
Accepted
Published online

Spectrally resolved fluorescence lifetime imaging1, 2, 3 and spatial multiplexing1, 4, 5 have offered information content and collection-efficiency boosts in microscopy, but efficient implementations for macroscopic applications are still lacking. An imaging platform based on time-resolved structured light and hyperspectral single-pixel detection has been developed to perform quantitative macroscopic fluorescence lifetime imaging (MFLI) over a large field of view (FOV) and multiple spectral bands simultaneously. The system makes use of three digital micromirror device (DMD)-based spatial light modulators (SLMs) to generate spatial optical bases and reconstruct N by N images over 16 spectral channels with a time-resolved capability (∼40 ps temporal resolution) using fewer than N2 optical measurements. We demonstrate the potential of this new imaging platform by quantitatively imaging near-infrared (NIR) Förster resonance energy transfer (FRET) both in vitro and in vivo. The technique is well suited for quantitative hyperspectral lifetime imaging with a high sensitivity and paves the way for many important biomedical applications.

At a glance

Figures

  1. System diagram and typical hyperspectral TPSF example.
    Figure 1: System diagram and typical hyperspectral TPSF example.

    a, Diagram of the time-resolved hyperspectral single-pixel imager with transmission mode (formed by DMD I and III) and reflectance mode (formed by DMD II and III). The NIR CCD and mirror are only used during calibration. The laser-power control and fibre-coupling modules are not shown. b, Visualizations of an acquired data cube (top left, measurements under the first 100 Hadamard patterns acquired by the system) and hyperspectral TPSFs (right) under the illumination of pattern no. 40 (bottom left). PC, photon count; a.u., arbitrary units.

  2. Results of in vitro study.
    Figure 2: Results of in vitro study.

    a, Well-plate sample intensity captured using the NIR CCD (rescaled to a 64 × 64 resolution). The layout of the plate in terms of the relative acceptor:donor (A:D) ratio from well no. 1 to no. 9 is as follows: 0:1, 0:0, 0:0, 1:1, 2:1, 3:1, 1:0, 2:0 and 3:0. Wells 2 and 3 are used as the control with PBS only. b,c, Reconstructed spectrally resolved intensity and mean-lifetime spatial maps via the single-pixel method. d,e, Spectrally resolved intensity and mean-lifetime distributions for each well. f, FD% estimated via a bi-exponential decay fitting of wells 1 and 4–6 at the 725 nm channel and comparison with results obtained using an ICCD-based imaging system. Equivalence tests show that their mean FD% values are within a ±6% absolute margin at the 0.05 significance level (P = 0.023). Error bars represent s.d.

  3. Results of the in vivo study.
    Figure 3: Results of the in vivo study.

    a, Fluorescence signals captured using the NIR CCD (FOV, 40 mm × 40 mm) at 4 h post-injection of NIR FRET-labelled transferrin. b,c, Examples of the spectrally resolved single-pixel spatial reconstruction of intensity (b) and mean lifetime (c) at 4 h post-injection for subject no. 1. d,e, Means and standard deviations of intensity (d) and lifetime (e) over the liver and the urinary bladder as retrieved from single-pixel processing (4 and 6 h post-injection of subject no. 1). f, FD% of the two organs at the donor emission peak channel for four subjects and comparison with the results obtained from the ICCD-based system at 4 h post-injection. Here ‘Lm’ and ‘Bm’ (m = 1, 2, 3 and 4) represent the liver and the urinary bladder, respectively, for subject no. m. Equivalence tests show that their mean FD% values are within a ±6% absolute margin at the 0.05 significance level (P = 0.007). Error bars represent s.d.

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Affiliations

  1. Biomedical Engineering Department, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, USA

    • Qi Pian,
    • Ruoyang Yao,
    • Nattawut Sinsuebphon &
    • Xavier Intes

Contributions

X.I. conceived the original idea. Q.P. contributed to the platform instrumentation, control software design and experimental validation. R.Y. contributed to the pattern implementation, initial simulations and image reconstruction. N.S. contributed to the animal study protocol and experiments. All the authors contributed to the analysis of the experimental results and to writing the manuscript.

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The authors declare no competing financial interests.

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