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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 27, Iss. 11 — Nov. 1, 2010
  • pp: 2402–2410

Referencing techniques for the analog mean-delay method in fluorescence lifetime imaging

Young Jae Won, Sucbei Moon, Won-Taek Han, and Dug Young Kim  »View Author Affiliations


JOSA A, Vol. 27, Issue 11, pp. 2402-2410 (2010)
http://dx.doi.org/10.1364/JOSAA.27.002402


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Abstract

The analog mean-delay (AMD) method is a new powerful alternative method in determining the lifetime of a fluorescence molecule for high-speed confocal fluorescence lifetime imaging microscopy. Even though the photon economy and the lifetime precision of the AMD method are proven to be as good as those of the state-of-the-art time-correlated single photon counting method, there have been some speculations and concerns about the accuracy of this method with respect to the absolute lifetime value of a fluorescence probe. In the AMD method, the temporal waveform of an emitted fluorescence signal is directly recorded with a slow digitizer whose bandwidth is much lower than the temporal resolution of the lifetime to be measured. We have found that the drifts and the fluctuations of the absolute zero position in a measured temporal waveform are the major problems in the AMD method. We have proposed electrical and optical referencing techniques that may suppress these errors. It is shown that there may exist more than 2 ns drift in a measured temporal waveform during the period of the first 12 min after electronic components are turned on. The standard deviation of a measured lifetime after this warm-up period can be as large as 51 ps without any referencing technique. We have shown that this error can be reduced to 9 ps with our electronic referencing technique. It is demonstrated that this can be further reduced to 4 ps by the optical referencing technique we have introduced.

© 2010 Optical Society of America

OCIS Codes
(000.2170) General : Equipment and techniques
(170.1790) Medical optics and biotechnology : Confocal microscopy
(170.2520) Medical optics and biotechnology : Fluorescence microscopy
(170.3650) Medical optics and biotechnology : Lifetime-based sensing
(170.6920) Medical optics and biotechnology : Time-resolved imaging

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: July 2, 2010
Revised Manuscript: September 8, 2010
Manuscript Accepted: September 8, 2010
Published: October 15, 2010

Virtual Issues
Vol. 6, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Young Jae Won, Sucbei Moon, Won-Taek Han, and Dug Young Kim, "Referencing techniques for the analog mean-delay method in fluorescence lifetime imaging," J. Opt. Soc. Am. A 27, 2402-2410 (2010)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-27-11-2402

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