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MRI‐based large deformation high dimensional mapping of the hippocampus in rats: Development and validation of the technique

Identifieur interne : 001984 ( Istex/Corpus ); précédent : 001983; suivant : 001985

MRI‐based large deformation high dimensional mapping of the hippocampus in rats: Development and validation of the technique

Auteurs : R. Edward Hogan ; Viviane Bouilleret ; Ying Rui Liu ; Lei Wang ; John P. Williams ; Bianca Jupp ; Damian Myers ; Terence J. O'Brien

Source :

RBID : ISTEX:890D21C2D170D8AB44DAE93271A762B36BB70590

English descriptors

Abstract

To report the detection of structural and functional biological changes in living animals using small animal in vivo MRI that complements traditional ex vivo histological techniques. We report the development and validation of the application of large deformation high dimensional mapping (HDM‐LD) segmentation for the hippocampus in the rat.

Url:
DOI: 10.1002/jmri.21766

Links to Exploration step

ISTEX:890D21C2D170D8AB44DAE93271A762B36BB70590

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Materials and Methods
<p>High resolution volumetric T2 weighted MRI images were acquired at 4.7 Tesla from six male in‐breed nonepileptic Wistar rats. Two HDM‐LD segmentations of the hippocampus (automated 1 and automated 2) were compared with the manual segmentations of two investigators who independently segmented the hippocampi (manual 1 and manual 2).</p>
Results
<p>The mean overlap for the hippocampi between automated 1 and automated 2 for the right hippocampi was 94.4% (SD 1.0) and for the left hippocampi was 94.3% (SD 2.5), while the mean overlap between automated 1 and manual 1 for the right hippocampi was 91.4% (SD 1.3) and for the left hippocampi was 91.9% (SD 1.4). Mean values for absolute differences for comparisons of all the segmentations were the following: automated 1 versus automated 2, 3.2% (SD 1.0); manual 1 versus manual 2 6.82% (SD 5.22); automated 1 versus manual 1 13.0% (SD 1.8).</p>
Conclusion
<p>HDM‐LD can be applied to obtain accurate and reproducible three‐dimensional segmentations of the hippocampus from rat MR images. HDM‐LD will be a useful tool for investigations of hippocampal structural changes in vivo in rat models of human disease. J. Magn. Reson. Imaging 2009;29:1027–1034. © 2009 Wiley‐Liss, Inc.</p>
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<abstract>To report the detection of structural and functional biological changes in living animals using small animal in vivo MRI that complements traditional ex vivo histological techniques. We report the development and validation of the application of large deformation high dimensional mapping (HDM‐LD) segmentation for the hippocampus in the rat.</abstract>
<abstract>High resolution volumetric T2 weighted MRI images were acquired at 4.7 Tesla from six male in‐breed nonepileptic Wistar rats. Two HDM‐LD segmentations of the hippocampus (automated 1 and automated 2) were compared with the manual segmentations of two investigators who independently segmented the hippocampi (manual 1 and manual 2).</abstract>
<abstract>The mean overlap for the hippocampi between automated 1 and automated 2 for the right hippocampi was 94.4% (SD 1.0) and for the left hippocampi was 94.3% (SD 2.5), while the mean overlap between automated 1 and manual 1 for the right hippocampi was 91.4% (SD 1.3) and for the left hippocampi was 91.9% (SD 1.4). Mean values for absolute differences for comparisons of all the segmentations were the following: automated 1 versus automated 2, 3.2% (SD 1.0); manual 1 versus manual 2 6.82% (SD 5.22); automated 1 versus manual 1 13.0% (SD 1.8).</abstract>
<abstract>HDM‐LD can be applied to obtain accurate and reproducible three‐dimensional segmentations of the hippocampus from rat MR images. HDM‐LD will be a useful tool for investigations of hippocampal structural changes in vivo in rat models of human disease. J. Magn. Reson. Imaging 2009;29:1027–1034. © 2009 Wiley‐Liss, Inc.</abstract>
<note type="funding">Victorian Government Transport Accident Commission (TAC) - No. DP0023; </note>
<subject lang="en">
<genre>keywords</genre>
<topic>MRI</topic>
<topic>hippocampus</topic>
<topic>rat</topic>
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<identifier type="ISSN">1053-1807</identifier>
<identifier type="eISSN">1522-2586</identifier>
<identifier type="DOI">10.1002/(ISSN)1522-2586</identifier>
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<identifier type="DOI">10.1002/jmri.21766</identifier>
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<accessCondition type="use and reproduction" contentType="copyright">Copyright © 2009 Wiley‐Liss, Inc.</accessCondition>
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