Cited by 890Advanced Fluorescence Microscopy TechniquesPhotochemistry and Electron Transfer StudiesOptical Imaging and Spectroscopy Techniques

Fluorescence lifetime imaging – techniques and applications

BECKER, W.·2012·Journal of Microscopy

Abstract

Summary: Fluorescence lifetime imaging (FLIM) uses the fact that the fluorescence lifetime of a fluorophore depends on its molecular environment but not on its concentration. Molecular effects in a sample can therefore be investigated independently of the variable, and usually unknown concentration of the fluorophore. There is a variety of technical solutions of lifetime imaging in microscopy. The technical part of this paper focuses on time‐domain FLIM by multidimensional time‐correlated single photon counting, time‐domain FLIM by gated image intensifiers, frequency‐domain FLIM by gain‐modulated image intensifiers, and frequency‐domain FLIM by gain‐modulated photomultipliers. The application part describes the most frequent FLIM applications: Measurement of molecular environment parameters, protein‐interaction measurements by Förster resonance energy transfer (FRET), and measurements of the metabolic state of cells and tissue via their autofluorescence. Measurements of local environment parameters are based on lifetime changes induced by fluorescence quenching or conformation changes of the fluorophores. The advantage over intensity‐based measurements is that no special ratiometric fluorophores are needed. Therefore, a much wider selection of fluorescence markers can be used, and a wider range of cell parameters is accessible. FLIM‐FRET measures the change in the decay function of the FRET donor on interaction with an acceptor. FLIM‐based FRET measurement does not have to cope with problems like donor bleedthrough or directly excited acceptor fluorescence. This relaxes the requirements to the absorption and emission spectra of the donors and acceptors used. Moreover, FLIM‐FRET measurements are able to distinguish interacting and noninteracting fractions of the donor, and thus obtain independent information about distances and interacting and noninteracting protein fractions. This is information not accessible by steady‐state FRET techniques. Autofluorescence FLIM exploits changes in the decay parameters of endogenous fluorophores with the metabolic state of the cells or the tissue. By resolving changes in the binding, conformation, and composition of biologically relevant compounds FLIM delivers information not accessible by steady‐state fluorescence techniques.

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Crossref · 10.1111/j.1365-2818.2012.03618.x

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Authors
BECKER, W.
Corresponding author
BECKER, W.
Venue
Journal of Microscopy
Publisher
Wiley
Published
2012-05-24
Volume
247
Issue
2
Pages
119-136
ISSN
  • 0022-2720 (ISSN-L)
  • 1365-2818
OpenAlex
W1960176772
Cited by
890
References
126
Citations by year
2026: 58 · 2025: 90 · 2024: 84 · 2023: 69 · 2022: 51 · 2021: 65 · 2020: 74 · 2019: 93 · 2018: 68 · 2017: 55 · 2016: 47 · 2015: 50 · 2014: 49 · 2013: 32 · 2012: 3
FWCI
5.27
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Microscopy (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Advanced Fluorescence Microscopy Techniques
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Optical Imaging and Spectroscopy Techniques
Keywords
fluorescence lifetime imaging, time-correlated single photon counting, fluorescence resonance energy transfer, FLIM-FRET, fluorescence quenching, protein-protein interaction, tissue autofluorescence, endogenous fluorophores, molecular environment
MeSH terms
Image Processing, Computer-Assisted, Microscopy, Fluorescence

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