Document Detail

Evaluation of emphysema severity and progression in a rabbit model: comparison of hyperpolarized 3He and 129Xe diffusion MRI with lung morphometry.
MedLine Citation:
PMID:  17110518     Owner:  NLM     Status:  MEDLINE    
The apparent diffusion coefficients (ADCs) of hyperpolarized (3)He and (129)Xe gases were measured in the lungs of rabbits with elastase-induced emphysema and correlated against the mean chord length from lung histology. In vivo measurements were performed at baseline and 2, 4, 6, and 8 wk after instillation of elastase (mild and moderate emphysema groups) or saline (control group). ADCs were determined from acquisitions that used two b values. To investigate the effect of b value on the results, b-value pairs of 0 and 1.6 s/cm(2) and 0 and 4.0 s/cm(2) were used for (3)He, and b-value pairs of 0 and 5.0 s/cm(2) and 0 and 10.0 s/cm(2) were used for (129)Xe. At 8 wk after instillation, the rabbits were euthanized, and the lungs were analyzed histologically and morphometrically. ADCs for the rabbits in the control group did not change significantly from baseline to week 8, whereas ADCs for the rabbits in the emphysema groups increased significantly (P < 0.05) for all gas and b-value combinations except (129)Xe with the b-value pair of 0 and 5.0 s/cm(2). The largest percent change in mean ADC from baseline to week 8 (15.3%) occurred with (3)He and the b-value pair of 0 and 1.6 s/cm(2) for rabbits in the moderate emphysema group. ADCs (all b values) were strongly correlated (r = 0.62-0.80, P < 0.001) with mean chord lengths from histology. These results further support the ability of diffusion-weighted MRI with hyperpolarized gases to detect regional and global structural changes of emphysema within the lung.
Jaime F Mata; Talissa A Altes; Jing Cai; Kai Ruppert; Wayne Mitzner; Klaus D Hagspiel; Bina Patel; Michael Salerno; James R Brookeman; Eduard E de Lange; William A Tobias; Hsuan-Tsung J Wang; Gordon D Cates; John P Mugler
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Validation Studies     Date:  2006-11-16
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  102     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2007 Mar 
Date Detail:
Created Date:  2007-03-07     Completed Date:  2007-04-30     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1273-80     Citation Subset:  IM    
Dept. of Radiology, University of Virginia School of Medicine, Charlottesville, VA 22908, USA.
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MeSH Terms
Body Weight
Diffusion Magnetic Resonance Imaging*
Disease Models, Animal
Emphysema / pathology*
Helium / diagnostic use*
Isotopes / diagnostic use
Lung / pathology*
Reproducibility of Results
Time Factors
Xenon Isotopes / diagnostic use*
Grant Support
Reg. No./Substance:
0/Isotopes; 0/Xenon Isotopes; 7440-59-7/Helium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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