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CT DICOM studies from: In vivo measurements of lung volumes in ringed seals: insights from biomedical imaging

Citation

Hermann-Sorensen, Holly et al. (2020), CT DICOM studies from: In vivo measurements of lung volumes in ringed seals: insights from biomedical imaging, Dryad, Dataset, https://doi.org/10.7291/D1R68J

Abstract

This dataset supports:

Hermann-Sorensen, H., Thometz, N.M., Woodie, K., Dennison-Gibby, S., and Reichmuth, C. In vivo measurements of lung volumes in ringed seals: insights from biomedical imaging. Journal of Experimental Biology.

Marine mammals rely on oxygen stored in blood, muscle, and lungs to support breath-hold diving and foraging at sea. Here, we used biomedical imaging to examine lung oxygen stores and other key respiratory parameters in living ringed seals (Pusa hispida). Three-dimensional models created from computed tomography (CT) images were used to quantify total lung capacity (TLC), respiratory dead space, minimum air volume, and total body volume to improve assessments of lung oxygen storage capacity, scaling relationships, and buoyant force estimates. Results suggest that lung oxygen stores determined in vivo are smaller than those derived from typical postmortem measurements. We also demonstrate that—while established allometric relationships hold well for most pinnipeds—these relationships consistently overestimate TLC for the smallest phocid seal. Finally, measures of total body volume reveal differences in calculated body density and net buoyant force that would influence costs associated with diving and foraging in free-ranging seals.

Methods

CT data were obtained from living ringed seals under anesthesia with slice thickness of 0.625 - 2.5 mm. Whole body scans were obtained when possible. The dataset contains DICOM images from nine complete series obtained with four individuals. Metadata associated with each series can be found in the published manuscript.

Usage Notes

Title of each file contains information about animal identification, inflation pressure, patient position, and whether the scan was taken with or without contrast. Details and subject metadata can be found in the published manuscript; modified thoracic CT imaging protocols and scanner information are provided in Table S1.

Funding

National Oceanic and Atmospheric Administration, Award: NA15NMF4390166, NA16NMF4390027