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Ultrahigh field MRI determination of water diffusion rates in ex vivo human lenses of different age

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Item Type:Article
Title:Ultrahigh field MRI determination of water diffusion rates in ex vivo human lenses of different age
Creators Name:Stahnke, T. and Lindner, T. and Guthoff, R. and Stachs, O. and Wree, A. and Langner, S. and Niendorf, T. and Grabow, N. and Glass, Ä. and Beller, E. and Polei, S.
Abstract:BACKGROUND: The development of presbyopia is correlated with increased lens stiffness. To reveal structural changes with age, ultrahigh field magnetic resonance imaging (UHF-MRI) was used to analyze water diffusion in differently aged human lenses ex vivo. METHODS: After enucleation lens extractions were performed. Lenses were photographed, weighed, and embedded in 0.5% agarose dissolved in culture medium. UHF-MRI was conducted to analyze anatomical characteristics of the lens using T2-weighted Turbo-RARE imaging and to obtain apparent diffusion coefficients (ADC) measurements. A Gaussian fit routine was used to examine the ADC histograms. RESULTS: An age-dependent increase in lens wet weight, lens thickness, and lens diameter was found (P<0.001). T2-weighted images revealed a hyperintense lens cortex and a gradually negative gradient in signal intensity towards the nucleus. ADC histograms of the lens showed bimodal distributions (lower ADC values mainly located in the nucleus and higher ADC values mainly located in the cortex), which did not change significantly with age [βPeak1=1.96E-7 (-20E-7, 10E-7), P=0.804 or βPeak2=15.4E-7 (-10E-7, 40E-7), P=0.276; respectively]. CONCLUSIONS: Clinically relevant age dependent lens hardening is probably not correlated with ADC changes within the nucleus, which could be confirmed by further measurements.
Keywords:Ultrahigh Field Magnetic Resonance Imaging (UHF-MRI), Diffusion Weighted Imaging, Aging, Human Lens
Source:Quantitative Imaging in Medicine and Surgery
Publisher:AME Publishing
Page Range:3029-3041
Date:July 2021
Additional Information:Copyright © Quantitative Imaging in Medicine and Surgery. All rights reserved. Erratum in Quant Imag Med Surg 11(11):4707-4708
Official Publication:https://doi.org/10.21037/qims-20-1124
PubMed:View item in PubMed

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