Estimation of optical fluorescent impulse response kernel in combined time and wavelength spaces

Olga V. Ivanova, Laura Marcu, Michael C K Khoo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Current state of the knowledge in the field of optical diagnostics indicates that application of both steady state and time-resolved fluorescence spectroscopy permits the discrimination among normal and pathological tissues. Most data analysis algorithms, however, separately address either the spectral profile of the fluorescence emission or the time domain features of fluorescence decay of tissue sample. We present a novel system identification technique that allows for intrinsic Fluorescent Impulse Response Kernel (FIRK) estimation in combined time and wavelength spaces. The fluorescence experiment is described as a discrete two-dimensional single input - single output system. Modeling of FIRK is based on the characteristics of spectro-temporal fluorescence waveforms. Taking advantage of the exponentially decaying temporal behavior of the fluorescent output, we use a linear combination of Laguerre functions to model the fluorescence response as a function of time. To address the large variability of spectral profiles from different biological samples, we use the discrete Fourier series expansion to model the variation of fluorescence intensity across wavelength. The validation of the proposed approach is performed on simulated fluorescence data and fluorescence data measured from fluorescence lifetime standards. The algorithm is applicable for an effective recovery of intrinsic FIRK from any excitation light probe spectro-temporal waveforms. The retrieved FIRK can be further used for modeling and/or classification of pathological and physiological conditions of tissues.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsB. Chance, R.R. Alfano, B.J. Tromberg, M. Tamura, E.M. Sevick-Muraca
Pages330-341
Number of pages12
Volume4955
DOIs
StatePublished - 2003
EventPROGRESS IN BIOMEDICAL OPTICS AND IMAGING: Optical Tomography and Spectroscopy of Tissue V - San Jose, CA, United States
Duration: Jan 26 2003Jan 29 2003

Other

OtherPROGRESS IN BIOMEDICAL OPTICS AND IMAGING: Optical Tomography and Spectroscopy of Tissue V
CountryUnited States
CitySan Jose, CA
Period1/26/031/29/03

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Keywords

  • Fluorescent impulse response kernel
  • Fluorescent spectroscopy
  • Two-dimensional system identification

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Ivanova, O. V., Marcu, L., & Khoo, M. C. K. (2003). Estimation of optical fluorescent impulse response kernel in combined time and wavelength spaces. In B. Chance, R. R. Alfano, B. J. Tromberg, M. Tamura, & E. M. Sevick-Muraca (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4955, pp. 330-341) https://doi.org/10.1117/12.478213