title: Acoustic property reconstruction of a neonate Yangtze finless porpoise's (Neophocaena asiaeorientalis) head based on CT imaging.
abstract: The reconstruction of the acoustic properties of a neonate finless porpoise's head was performed using X-ray computed tomography (CT). The head of the deceased neonate porpoise was also segmented across the body axis and cut into slices. The averaged sound velocity and density were measured, and the Hounsfield units (HU) of the corresponding slices were obtained from computed tomography scanning. A regression analysis was employed to show the linear relationships between the Hounsfield unit and both sound velocity and density of samples. Furthermore, the CT imaging data were used to compare the HU value, sound velocity, density and acoustic characteristic impedance of the main tissues in the porpoise's head. The results showed that the linear relationships between HU and both sound velocity and density were qualitatively consistent with previous studies on Indo-pacific humpback dolphins and Cuvier's beaked whales. However, there was no significant increase of the sound velocity and acoustic impedance from the inner core to the outer layer in this neonate finless porpoise's melon.
authors: Key Laboratory of Underwater Acoustic Communication and Marine Information Technology (Xiamen University), Ministry of Education, Xiamen 361005, Fujian, China; Hawaii Institute of Marine Biology, University of Hawaii, 46-007 Lilipuna Road, Kaneohe, Hawaii 96744, United States of America.
authors: Chong
authors: C
authors: Wei
authors: Key Laboratory of Aquatic Biodiversity and Conservation of the Chinese Academy of Sciences, Institute of Hydrobiology of the Chinese Academy of Sciences, Wuhan 430072, P. R. China; University of Chinese Academy of Sciences, Beijing 100039, P. R. China.
authors: Zhitao
authors: Z
authors: Wang
authors: College of Oceanography and Environmental Science, Xiamen University, Xiping Building, Xiangan South Road, Xiamen, 361005, P. R. China.
authors: Zhongchang
authors: Z
authors: Song
authors: Key Laboratory of Aquatic Biodiversity and Conservation of the Chinese Academy of Sciences, Institute of Hydrobiology of the Chinese Academy of Sciences, Wuhan 430072, P. R. China.
authors: Kexiong
authors: K
authors: Wang
authors: Key Laboratory of Aquatic Biodiversity and Conservation of the Chinese Academy of Sciences, Institute of Hydrobiology of the Chinese Academy of Sciences, Wuhan 430072, P. R. China.
authors: Ding
authors: D
authors: Wang
authors: Hawaii Institute of Marine Biology, University of Hawaii, 46-007 Lilipuna Road, Kaneohe, Hawaii 96744, United States of America.
authors: Whitlow W L
authors: WW
authors: Au
authors: Key Laboratory of Underwater Acoustic Communication and Marine Information Technology (Xiamen University), Ministry of Education, Xiamen 361005, Fujian, China; College of Ocean & Sciences, Xiamen University, Xiamen 361005, Fujian, China.
authors: Yu
authors: Y
authors: Zhang
mesh_terms: D000162:Acoustics; D000818:Animals; D000831:Animals, Newborn; D006257:Head / Q000000981:diagnostic imaging*; D021621:Imaging, Three-Dimensional; D019576:Porpoises; D014057:Tomography, X-Ray Computed