Spatial frequency domain imaging of intrinsic optical property contrast in a mouse model of alzheimer's disease

Alexander J. Lin, Maya A. Koike, Kim N. Green, Jae G. Kim, Amaan Mazhar, Tyler B. Rice, Frank M. Laferla, Bruce J. Tromberg

Research output: Contribution to journalArticle

Abstract

Extensive changes in neural tissue structure and function accompanying Alzheimer's disease (AD) suggest that intrinsic signal optical imaging can provide new contrast mechanisms and insight for assessing AD appearance and progression. In this work, we report the development of a wide-field spatial frequency domain imaging (SFDI) method for non-contact, quantitative in vivo optical imaging of brain tissue composition and function in a triple transgenic mouse AD model (3xTg). SFDI was used to generate optical absorption and scattering maps at up to 17 wavelengths from 650 to 970 nm in 20-month-old 3xTg mice (n = 4) and age-matched controls (n = 6). Wavelength-dependent optical properties were used to form images of tissue hemoglobin (oxy-, deoxy-, and total), oxygen saturation, and water. Significant baseline contrast was observed with 13-26% higher average scattering values and elevated water content (52 ± 2% vs. 31 ± 1%); reduced total tissue hemoglobin content (127 ± 9 μM vs. 174 ± 6 μM); and lower tissue oxygen saturation (57 ± 2% vs. 69 ± 3%) in AD vs. control mice. Oxygen inhalation challenges (100% oxygen) resulted in increased levels of tissue oxy-hemoglobin (ctO2Hb) and commensurate reductions in deoxy-hemoglobin (ctHHb), with ∼60-70% slower response times and ∼7 μM vs. ∼14 μM overall changes for 3xTg vs. controls, respectively. Our results show that SFDI is capable of revealing quantitative functional contrast in an AD model and may be a useful method for studying dynamic alterations in AD neural tissue composition and physiology.

Original languageEnglish
Pages (from-to)1349-1357
Number of pages9
JournalAnnals of biomedical engineering
Volume39
Issue number4
DOIs
StatePublished - Apr 2011
Externally publishedYes

Keywords

  • Absorption
  • Diffuse optical imaging
  • Hyperoxia
  • In vivo spectroscopy
  • Microvascular perfusion
  • Scattering
  • Structured light
  • Tissue optical properties
  • Vascular reactivity

Fingerprint Dive into the research topics of 'Spatial frequency domain imaging of intrinsic optical property contrast in a mouse model of alzheimer's disease'. Together they form a unique fingerprint.

  • Cite this

    Lin, A. J., Koike, M. A., Green, K. N., Kim, J. G., Mazhar, A., Rice, T. B., Laferla, F. M., & Tromberg, B. J. (2011). Spatial frequency domain imaging of intrinsic optical property contrast in a mouse model of alzheimer's disease. Annals of biomedical engineering, 39(4), 1349-1357. https://doi.org/10.1007/s10439-011-0269-6