Cited by 305Advanced Neuroimaging Techniques and ApplicationsAdvanced MRI Techniques and ApplicationsNMR spectroscopy and applications

Aldehyde fixative solutions alter the water relaxation and diffusion properties of nervous tissue

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Shepherd, Timothy M., Thelwall, Peter E., Stanisz, Greg J., Blackband, Stephen J.·2009·Magnetic Resonance in Medicine

Abstract

Chemically‐fixed nervous tissues are well‐suited for high‐resolution, time‐intensive MRI acquisitions without motion artifacts, such as those required for brain atlas projects, but the aldehyde fixatives used may significantly alter tissue MRI properties. To test this hypothesis, this study characterized the impact of common aldehyde fixatives on the MRI properties of a rat brain slice model. Rat cortical slices immersion‐fixed in 4% formaldehyde demonstrated 21% and 81% reductions in tissue T 1 and T 2 , respectively ( P < 0.001). The T 2 reduction was reversed by washing slices with phosphate‐buffered saline (PBS) for 12 h to remove free formaldehyde solution. Diffusion MRI of cortical slices analyzed with a two‐compartment analytical model of water diffusion demonstrated 88% and 30% increases in extracellular apparent diffusion coefficient (ADC EX ) and apparent restriction size, respectively, when slices were chemically‐fixed with 4% formaldehyde ( P ≤ 0.021). Further, fixation with 4% formaldehyde increased the transmembrane water exchange rate 239% ( P < 0.001), indicating increased membrane permeability. Karnovsky's and 4% glutaraldehyde fixative solutions also changed the MRI properties of cortical slices, but significant differences were noted between the different fixative treatments ( P < 0.05). The observed water relaxation and diffusion changes help better define the validity and limitations of using chemically‐fixed nervous tissue for MRI investigations. Magn Reson Med, 2009. © 2009 Wiley‐Liss, Inc.

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  1. [19]Shepherd TM Flint J Thelwall PE Stanisz GJ Blackband SJ Postmortem interval alters the water relaxation and diffusion properties of nervous tissue—implications for high resolution MRI of human autopsy samples Proceedings of the 14th Annual Meeting of ISMRM Seattle, WA, USA 2006 Abstract 139
  2. [22]Conners Gluck Neocortex: cellular properties and intrinsic circuitry Dingledine R Brain slices New York Plenum Press 1984 313 340
  3. [33]Shepherd TM Thelwall PE Stanisz GJ Blackband SJ Analytical model of water diffusion in isocortex slices Proceedings of the 12th Annual Meeting of ISMRM Kyoto, Japan 2004 Abstract 1229
  4. [35]Bossart EL Inglis BA Silver XS Mareci TH The effect of fixative solutions in magnetic resonance imaging Proceedings of the 7th Annual Meeting of ISMRM Philadelphia, PA, USA 1999 Abstract 1928

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Authors
Shepherd, T. M., Thelwall, P. E., Stanisz, G. J., & Blackband, S. J.
Affiliations
  • University of California, San Francisco (US)
  • Newcastle University (GB)
  • Sunnybrook Health Science Centre (CA)
  • University of Florida (US)
Corresponding author
Shepherd, Timothy M.
Venue
Magnetic Resonance in Medicine
Publisher
Wiley
Published
2009-04-07
Volume
62
Issue
1
Pages
26-34
ISSN
  • 0740-3194 (ISSN-L)
  • 1522-2594
OpenAlex
W1965000453
Cited by
305
References
39
Citations by year
2026: 13 · 2025: 17 · 2024: 19 · 2023: 16 · 2022: 18 · 2021: 16 · 2020: 21 · 2019: 27 · 2018: 25 · 2017: 17 · 2016: 12 · 2015: 20 · 2014: 17 · 2013: 17 · 2012: 14
FWCI
12.34
Type
journal article
Language
en
Open access
Locations
  • Magnetic Resonance in Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Newcastle University ePrints (Newcastle Univesity)
Funders
National Institutes of Health (RO1 NS36992, P41 RR16105)
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced MRI Techniques and Applications
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › NMR spectroscopy and applications
Keywords
aldehyde fixatives, formalin fixation, glutaraldehyde fixation, T1 and T2 relaxation, water diffusion, apparent diffusion coefficient, extracellular diffusion, membrane permeability, cortical slices, brain atlas
MeSH terms
Animals, Brain, Brain Chemistry, Cells, Cultured, Diffusion, Fixatives, Formaldehyde, Male, Sensitivity and Specificity, Water, Reproducibility of Results, Artifacts, Rats, Long-Evans, Diffusion Magnetic Resonance Imaging, Rats

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