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In vivo measurements of T2 relaxation time of mouse lungs during inspiration and expiration

Olsson, Lars E. LU and Hockings, Paul D. (2016) In PLoS ONE 11(12).
Abstract

Purpose: The interest in measurements of magnetic resonance imaging relaxation times, T1, T2, T2∗, with intention to characterize healthy and diseased lungs has increased recently. Animal studies play an important role in this context providing models for understanding and linking the measured relaxation time changes to the underlying physiology or disease. The aim of this work was to study how the measured transversal relaxation time (T2) in healthy lungs is affected by normal respiration in mouse. Method: T2 of lung was measured in anaesthetized freely breathing mice. Image acquisition was performed on a 4.7 T, Bruker BioSpec with a multi spin-echo sequence (Car-Purcell-Meiboom-Gill) in both end-expiration and end-inspiration. The... (More)

Purpose: The interest in measurements of magnetic resonance imaging relaxation times, T1, T2, T2∗, with intention to characterize healthy and diseased lungs has increased recently. Animal studies play an important role in this context providing models for understanding and linking the measured relaxation time changes to the underlying physiology or disease. The aim of this work was to study how the measured transversal relaxation time (T2) in healthy lungs is affected by normal respiration in mouse. Method: T2 of lung was measured in anaesthetized freely breathing mice. Image acquisition was performed on a 4.7 T, Bruker BioSpec with a multi spin-echo sequence (Car-Purcell-Meiboom-Gill) in both end-expiration and end-inspiration. The echo trains consisted of ten echoes of inter echo time 3.5 ms or 4.0 ms. The proton density, T2 and noise floor were fitted to the measured signals of the lung parenchyma with a Levenberg-Marquardt least-squares threeparameter fit. Results: T2 in the lungs was longer (p<0.01) at end-expiration (9.7±0.7 ms) than at end-inspiration (9.0±0.8 ms) measured with inter-echo time 3.5 ms. The corresponding relative proton density (lung/muscle tissue) was higher (p<0.001) during end-expiration, (0.61±0.06) than during end-inspiration (0.48±0.05). The ratio of relative proton density at end-inspiration to that at end-expiration was 0.78±0.09. Similar results were found for inter-echo time 4.0 ms and there was no significant difference between the T2 values or proton densities acquired with different interecho times. The T2 value increased linearly (p< 0.001) with proton density. Conclusion: The measured T2 in-vivo is affected by diffusion across internal magnetic susceptibility gradients. In the lungs these gradients are modulated by respiration, as verified by calculations. In conclusion the measured T2 was found to be dependent on the size of the alveoli.

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published
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in
PLoS ONE
volume
11
issue
12
publisher
Public Library of Science
external identifiers
  • scopus:85006070067
  • wos:000389587100046
ISSN
1932-6203
DOI
10.1371/journal.pone.0166879
language
English
LU publication?
yes
id
8d6ad757-8113-4ea8-9577-c9cc7895aeda
date added to LUP
2016-12-28 15:26:12
date last changed
2017-09-18 11:33:53
@article{8d6ad757-8113-4ea8-9577-c9cc7895aeda,
  abstract     = {<p>Purpose: The interest in measurements of magnetic resonance imaging relaxation times, T1, T2, T2∗, with intention to characterize healthy and diseased lungs has increased recently. Animal studies play an important role in this context providing models for understanding and linking the measured relaxation time changes to the underlying physiology or disease. The aim of this work was to study how the measured transversal relaxation time (T2) in healthy lungs is affected by normal respiration in mouse. Method: T2 of lung was measured in anaesthetized freely breathing mice. Image acquisition was performed on a 4.7 T, Bruker BioSpec with a multi spin-echo sequence (Car-Purcell-Meiboom-Gill) in both end-expiration and end-inspiration. The echo trains consisted of ten echoes of inter echo time 3.5 ms or 4.0 ms. The proton density, T2 and noise floor were fitted to the measured signals of the lung parenchyma with a Levenberg-Marquardt least-squares threeparameter fit. Results: T2 in the lungs was longer (p&lt;0.01) at end-expiration (9.7±0.7 ms) than at end-inspiration (9.0±0.8 ms) measured with inter-echo time 3.5 ms. The corresponding relative proton density (lung/muscle tissue) was higher (p&lt;0.001) during end-expiration, (0.61±0.06) than during end-inspiration (0.48±0.05). The ratio of relative proton density at end-inspiration to that at end-expiration was 0.78±0.09. Similar results were found for inter-echo time 4.0 ms and there was no significant difference between the T2 values or proton densities acquired with different interecho times. The T2 value increased linearly (p&lt; 0.001) with proton density. Conclusion: The measured T2 in-vivo is affected by diffusion across internal magnetic susceptibility gradients. In the lungs these gradients are modulated by respiration, as verified by calculations. In conclusion the measured T2 was found to be dependent on the size of the alveoli.</p>},
  articleno    = {e0166879},
  author       = {Olsson, Lars E. and Hockings, Paul D.},
  issn         = {1932-6203},
  language     = {eng},
  month        = {12},
  number       = {12},
  publisher    = {Public Library of Science},
  series       = {PLoS ONE},
  title        = {In vivo measurements of T2 relaxation time of mouse lungs during inspiration and expiration},
  url          = {http://dx.doi.org/10.1371/journal.pone.0166879},
  volume       = {11},
  year         = {2016},
}