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Magnetic resonance imaging and computed tomography as tools for the investigation of sperm whale (Physeter macrocephalus) teeth and eye

BACKGROUND: Scanning techniques such as magnetic resonance imaging (MRI) and computed tomography (CT) are useful tools in veterinary and human medicine. Here we demonstrate the usefulness of these techniques in the study of the anatomy of wild marine mammals as part of a necropsy. MRI and CT scans o...

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Autores principales: Alstrup, Aage Kristian Olsen, Munk, Ole Lajord, Jensen, Trine Hammer, Jensen, Lasse Fast, Hedayat, Abdi, Hansen, Brian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5468955/
https://www.ncbi.nlm.nih.gov/pubmed/28606113
http://dx.doi.org/10.1186/s13028-017-0307-y
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author Alstrup, Aage Kristian Olsen
Munk, Ole Lajord
Jensen, Trine Hammer
Jensen, Lasse Fast
Hedayat, Abdi
Hansen, Brian
author_facet Alstrup, Aage Kristian Olsen
Munk, Ole Lajord
Jensen, Trine Hammer
Jensen, Lasse Fast
Hedayat, Abdi
Hansen, Brian
author_sort Alstrup, Aage Kristian Olsen
collection PubMed
description BACKGROUND: Scanning techniques such as magnetic resonance imaging (MRI) and computed tomography (CT) are useful tools in veterinary and human medicine. Here we demonstrate the usefulness of these techniques in the study of the anatomy of wild marine mammals as part of a necropsy. MRI and CT scans of sperm whale teeth (n = 4) were performed. The methods were compared and further compared to current standard methods for evaluation of tooth layering. For MRI a zero echo time sequence was used, as previously done for imaging of intact human teeth. For CT two different clinical scanners were used. RESULTS: The three scanners did not provide sufficient information to allow age estimation, but both MRI and CT provided anatomical information about the tooth cortex and medulla without the need for sectioning the teeth. MRI scanning was also employed for visualizing the vascularization of an intact eye from one of the stranded sperm whale. CONCLUSIONS: Clearly, MRI was useful for investigation of the retinal vasculation, but optimum results would require well-preserved tissue. It was not possible to estimate age based on CT scans of tooth growth lines. Further research is needed to clarify the usability of MRI and CT as tools for marine mammal research when samples need to remain intact or when a spatial (three dimensional) arrangement of features needs to be determined.
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spelling pubmed-54689552017-06-14 Magnetic resonance imaging and computed tomography as tools for the investigation of sperm whale (Physeter macrocephalus) teeth and eye Alstrup, Aage Kristian Olsen Munk, Ole Lajord Jensen, Trine Hammer Jensen, Lasse Fast Hedayat, Abdi Hansen, Brian Acta Vet Scand Research BACKGROUND: Scanning techniques such as magnetic resonance imaging (MRI) and computed tomography (CT) are useful tools in veterinary and human medicine. Here we demonstrate the usefulness of these techniques in the study of the anatomy of wild marine mammals as part of a necropsy. MRI and CT scans of sperm whale teeth (n = 4) were performed. The methods were compared and further compared to current standard methods for evaluation of tooth layering. For MRI a zero echo time sequence was used, as previously done for imaging of intact human teeth. For CT two different clinical scanners were used. RESULTS: The three scanners did not provide sufficient information to allow age estimation, but both MRI and CT provided anatomical information about the tooth cortex and medulla without the need for sectioning the teeth. MRI scanning was also employed for visualizing the vascularization of an intact eye from one of the stranded sperm whale. CONCLUSIONS: Clearly, MRI was useful for investigation of the retinal vasculation, but optimum results would require well-preserved tissue. It was not possible to estimate age based on CT scans of tooth growth lines. Further research is needed to clarify the usability of MRI and CT as tools for marine mammal research when samples need to remain intact or when a spatial (three dimensional) arrangement of features needs to be determined. BioMed Central 2017-06-12 /pmc/articles/PMC5468955/ /pubmed/28606113 http://dx.doi.org/10.1186/s13028-017-0307-y Text en © The Author(s) 2017 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research
Alstrup, Aage Kristian Olsen
Munk, Ole Lajord
Jensen, Trine Hammer
Jensen, Lasse Fast
Hedayat, Abdi
Hansen, Brian
Magnetic resonance imaging and computed tomography as tools for the investigation of sperm whale (Physeter macrocephalus) teeth and eye
title Magnetic resonance imaging and computed tomography as tools for the investigation of sperm whale (Physeter macrocephalus) teeth and eye
title_full Magnetic resonance imaging and computed tomography as tools for the investigation of sperm whale (Physeter macrocephalus) teeth and eye
title_fullStr Magnetic resonance imaging and computed tomography as tools for the investigation of sperm whale (Physeter macrocephalus) teeth and eye
title_full_unstemmed Magnetic resonance imaging and computed tomography as tools for the investigation of sperm whale (Physeter macrocephalus) teeth and eye
title_short Magnetic resonance imaging and computed tomography as tools for the investigation of sperm whale (Physeter macrocephalus) teeth and eye
title_sort magnetic resonance imaging and computed tomography as tools for the investigation of sperm whale (physeter macrocephalus) teeth and eye
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5468955/
https://www.ncbi.nlm.nih.gov/pubmed/28606113
http://dx.doi.org/10.1186/s13028-017-0307-y
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