Optical simulations of a noninvasive technique for the diagnosis of diseased salivary glands in situ

I. Gannot, R. F. Bonner, G. Gannot, P. C. Fox, P. D. Smith, A. H. Gandjbakhche

Research output: Contribution to journalArticle

Abstract

A simulation experiment for three-dimensional (3D) imaging of exogenous fluorescinated antibodies that specifically bind to infiltrating lymphocytes in minor salivary glands was carried out. Small (2O1 mm3 volume) rhodamine targets, which mimic diseased minor salivary glands labeled with fluorescent antibodies to infiltrating lymphocytes in Sjogren's syndrome, were embedded in a highly scattering tissue phantom consisting of a thick Delrin(TM) disk covered by index matched DelrinTM slabs of various thickness. In this way the variation of fluorescence profiles on the surface of tissue could be examined corresponding to the range of depths of the Salivary glands in vivo. Surface images were obtained for different target depths and radial distances from laser excitation to target fluorophore. These images were analyzed and compared to calculations based on random walk theory in turbid media, using previously determined scattering and absorption coefficients of the Delrin(TM). Excellent agreement between the surface profiles experimentally measured and those predicted by our random walk theory was obtained. Derivation of these theoretical expressions is a necessary step toward devising an inverse algorithm which may have the potential expressions to perform 3D reconstruction of the concentration distribution of fluorescent labels within tissue.

Original languageEnglish (US)
Pages (from-to)1139-1144
Number of pages6
JournalMedical physics
Volume25
Issue number7 I
DOIs
StatePublished - Jul 1998
Externally publishedYes

Keywords

  • Exogenous fluorescent markers
  • Quantitative imaging
  • Random walk
  • Salivary glands
  • Sjogren syndrome

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

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  • Cite this

    Gannot, I., Bonner, R. F., Gannot, G., Fox, P. C., Smith, P. D., & Gandjbakhche, A. H. (1998). Optical simulations of a noninvasive technique for the diagnosis of diseased salivary glands in situ. Medical physics, 25(7 I), 1139-1144. https://doi.org/10.1118/1.598305