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Proceedings Paper

Investigating the impact of blood pressure increase to the brain using high resolution serial histology and image processing
Author(s): F. Lesage; A. Castonguay; P. L. Tardif; J. Lefebvre; B. Li
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Paper Abstract

A combined serial OCT/confocal scanner was designed to image large sections of biological tissues at microscopic resolution. Serial imaging of organs embedded in agarose blocks is performed by cutting through tissue using a vibratome which sequentially cuts slices in order to reveal new tissue to image, overcoming limited light penetration encountered in microscopy. Two linear stages allow moving the tissue with respect to the microscope objective, acquiring a 2D grid of volumes (1x1x0.3 mm) with OCT and a 2D grid of images (1x1mm) with the confocal arm. This process is repeated automatically, until the entire sample is imaged. Raw data is then post-processed to re-stitch each individual acquisition and obtain a reconstructed volume of the imaged tissue. This design is being used to investigate correlations between white matter and microvasculature changes with aging and with increase in pulse pressure following transaortic constriction in mice. The dual imaging capability of the system allowed to reveal different contrast information: OCT imaging reveals changes in refractive indices giving contrast between white and grey matter in the mouse brain, while transcardial perfusion of FITC or pre-sacrifice injection of Evans Blue shows microsvasculature properties in the brain with confocal imaging.

Paper Details

Date Published: 11 September 2015
PDF: 8 pages
Proc. SPIE 9597, Wavelets and Sparsity XVI, 95970M (11 September 2015); doi: 10.1117/12.2189110
Show Author Affiliations
F. Lesage, École Polytechnique de Montréal (Canada)
Insitut de Cardiologie de Montréal (Canada)
A. Castonguay, École Polytechnique de Montréal (Canada)
Insitut de Cardiologie de Montréal (Canada)
P. L. Tardif, École Polytechnique de Montreal (Canada)
Insitut de Cardiologie de Montréal (Canada)
J. Lefebvre, Insitut de Cardiologie de Montréal (Canada)
B. Li, École Polytechnique de Montréal (Canada)
Insitut de Cardiologie de Montréal (Canada)

Published in SPIE Proceedings Vol. 9597:
Wavelets and Sparsity XVI
Manos Papadakis; Vivek K. Goyal; Dimitri Van De Ville, Editor(s)

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