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Lookup NU author(s): Professor Per Berggren
Computed tomography (CT) imaging and ultrasound experimental measurements were combined to reconstruct the acoustic properties (density, velocity, and impedance) of the head from a deceased Indo-Pacific humpback dolphin (Sousa chinensis). The authors extracted 42 soft forehead tissue samples to estimate the sound velocity and density properties at room temperature, 25.0 °C. Hounsfield Units (HUs) of the samples were read from CT scans. Linear relationships between the tissues' HUs and velocity, and HUs and density were revealed through regression analyses. The distributions of the head acoustic properties at axial, coronal, and sagittal cross sections were reconstructed, suggesting that the forehead soft tissues were characterized by low-velocity in the melon, high-velocity in the muscle and connective tissues. Further, the sound velocities of melon, muscle, and connective tissue pieces were measured under different temperatures to investigate tissues' velocity response to temperature. The results demonstrated nonlinear relationships between tissues' sound velocity and temperature. This study represents a first attempt to provide general information on acoustic properties of this species. The results could provide meaningful information for understanding the species' bioacoustic characteristics and for further investigation on sound beam formation of the dolphin.
Author(s): Song Z, Zhang Y, Berggren P, Wei C
Publication type: Article
Publication status: Published
Journal: The Journal of the Acoustical Society of America
Year: 2017
Volume: 141
Issue: 2
Pages: 681-689
Print publication date: 01/02/2017
Online publication date: 01/02/2017
Acceptance date: 11/01/2017
Date deposited: 30/04/2017
ISSN (print): 0001-4966
ISSN (electronic): 1520-8524
Publisher: AIP Publishing LLC
URL: https://doi.org/10.1121/1.4974861
DOI: 10.1121/1.4974861
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