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276 results on '"Ketten, Darlene R."'

1. Discoveries in Marine Mammal Hearing

Author

Wartzok, Douglas, Ketten, Darlene R., Coffin, Allison B., Series Editor, Popper, Arthur N., Founding Editor, Avraham, Karen, Editorial Board Member, Sisneros, Joseph, Series Editor, Fay, Richard R., Founding Editor, Bass, Andrew, Editorial Board Member, Cunningham, Lisa, Editorial Board Member, Fritzsch, Bernd, Editorial Board Member, Groves, Andrew, Editorial Board Member, Hertzano, Ronna, Editorial Board Member, Le Prell, Colleen, Editorial Board Member, Litovsky, Ruth, Editorial Board Member, Manis, Paul, Editorial Board Member, Manley, Geoffrey, Editorial Board Member, Moore, Brian, Editorial Board Member, Simmons, Andrea, Editorial Board Member, Yost, William, Editorial Board Member, and Ketten, Darlene R., editor

Published
2024
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2. A History of Discoveries on Hearing: An Overview

Author

Popper, Arthur N., Ketten, Darlene R., Coffin, Allison B., Coffin, Allison B., Series Editor, Popper, Arthur N., Founding Editor, Avraham, Karen, Editorial Board Member, Sisneros, Joseph, Series Editor, Fay, Richard R., Founding Editor, Bass, Andrew, Editorial Board Member, Cunningham, Lisa, Editorial Board Member, Fritzsch, Bernd, Editorial Board Member, Groves, Andrew, Editorial Board Member, Hertzano, Ronna, Editorial Board Member, Le Prell, Colleen, Editorial Board Member, Litovsky, Ruth, Editorial Board Member, Manis, Paul, Editorial Board Member, Manley, Geoffrey, Editorial Board Member, Moore, Brian, Editorial Board Member, Simmons, Andrea, Editorial Board Member, Yost, William, Editorial Board Member, and Ketten, Darlene R., editor

Published
2024
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9. Potential for Sound Sensitivity in Cephalopods

Author

Mooney, T. Aran, Hanlon, Roger, Madsen, Peter T., Christensen-Dalsgaard, Jakob, Ketten, Darlene R., Nachtigall, Paul E., Back, Nathan, Series Editor, Cohen, Irun R., Series Editor, Lajtha, Abel, Series Editor, Lambris, John D., Series Editor, Paoletti, Rodolfo, Series Editor, Popper, Arthur N., editor, and Hawkins, Anthony, editor

Published
2012
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12. Reverse Engineering the Cetacean Ear to Extract Audiograms

Author

Zosuls, Aleks, Newburg, Seth O., Ketten, Darlene R., Mountain, David C., Back, Nathan, Series Editor, Cohen, Irun R., Series Editor, Lajtha, Abel, Series Editor, Lambris, John D., Series Editor, Paoletti, Rodolfo, Series Editor, Popper, Arthur N., editor, and Hawkins, Anthony, editor

Published
2012
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14. Cetacean Ears

Author

Ketten, Darlene R., Fay, Richard R., editor, Popper, Arthur N., editor, and Au, Whitlow W. L., editor

Published
2000
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27. Sherri Eldridge 1959–2020

Author

Connor, Richard C., primary, Ketten, Darlene R., additional, Moore, Michael J., additional, Reidenberg, Joy S., additional, Rosene, Douglas L., additional, Silva, Tammy, additional, and Wiley, David N., additional

Published
2020
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35. Unwrapping cochlear implants by spiral CT

Author

Wang, Ge, Vannier, Michael W., Skinner, Margaret W., Kalender, Willi A., Polacin, Arkadiusz, and Ketten, Darlene R.

Subjects
Cochlear implants -- Research, CT imaging -- Usage, Biological sciences, Business, Computers, Health care industry
Abstract

Multielectrode, intracochlear implants were designed for individuals with profound sensorineural hearing loss who derive little or no benefit from acoustic hearing aids. Determination of each electrode's position in a patient's inner ear may improve speech processor programming to maximize speech recognition. In this paper, an approach is described to use as input a volumetric spiral computed tomography (CT) image of the Nucleus electrode array (Cochlear Pty. Ltd, Lane Cove, NSW, Australia) to unwrap it, and to measure its implanted length given starting and end points. Representative curvilinear structures were digitally synthesized in image volumes of isotropic 0.1-mm voxels. The electrode array was spirally CT-scanned in vitro and in vivo, and reconstructed on an isotropic grid in 0.1-mm steps. Two algorithms were constructed to track and measure these curvilinear structures. The first algorithm is Karhunen-Loeve (K-L)-transform based, in which the K-L transform is locally applied at a current main axis position to determine the eigenvectors of the main axis voxels, the next main axis position is estimated from the current position along the principal eigendirection, adjusted to the mass center of the orthogonal cross section passing through the estimated position, and then scaled to have a prespecified step. The second algorithm is similar to the first one but avoids use of the K-L transform. In the second algorithm, the next position is directly estimated along the local direction and then processed with the same correction and scaling operations. With user-specified starting and end points as well as a local direction at the starting point, a curvilinear structure can be automatically tracked using either of the algorithms. The first algorithm is more robust, while the second one is more efficient. In the numerical and in vitro studies, the lengths of the curvilinear structures were accurately measured. Given local directions determined in the tracking process, an electrode array image can be unwrapped into a linear array with the central electrode axis as the abscissa. The unwrapping approach allows longitudinally and cross-sectionally accurate measurement and better visualization of cochlear implant images. With preimplantation knowledge of length, width, and center electrode distance, the position of individual electrodes can be estimated after unwrapping.

Published
1996

45. Erratum: Assessing the Impact of Underwater Clearance of Unexploded Ordnance on Harbour Porpoises (Phocoena phocoena) in the Southern North Sea

Author

von Benda-Beckman, Alexander M., primary, Aarts, Geert, additional, Sertlek, H. Özkan, additional, Lucke, Klaus, additional, Verboom, Wim C., additional, Kastelein, Ronald A., additional, Ketten, Darlene R., additional, van Bemmelen, Rob, additional, Lam, Frans-Peter A., additional, Kirkwood, Roger J., additional, and Ainslie, Michael A., additional

Published
2018
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47. Sound propagation in the near and far-field of a broadband echolocating dolphin and a narrowband echolocating porpoise.

Author

Chong Wei, Au, Whitlow W. L., Ketten, Darlene R., Vishnu, Hari, and Abel Zhong Hao Ho

Subjects
DOLPHINS, ACOUSTIC wave propagation, ECHOLOCATION (Physiology), SIGNAL processing, FINITE element method
Abstract

The echolocation signals emitted by odontocetes can be roughly classified into three broad categories: broadband high-frequency echolocation signals, narrowband high-frequency echolocation signals, and frequency modulated clicks. Previous measurements of broadband echolocation signals propagation in the bottlenose dolphin (Tursiops truncatus) did not find any evidence of focusing as the signals travel from the near to far-field. Finite element analysis (FEA) of high-resolution CT scan data was used to examine signal propagation of broadband echolocation signals of dolphins and narrowband echolocation signals of porpoises. The FEA results were used to simulate the propagation of clicks from phonic lips, traveling through the forehead, and finally transmission into the seawater. Biosonar beam formation in the near-field and far-field including the amplitude contours for the two species was determined. The finite element model was validated by finding the simulated amplitude contour in the horizontal plane was consistent with prior direct measurement results for Tursiops. Furthermore, the simulated far-field transmission beam patterns in both vertical and horizontal planes were also qualitatively consistent with results measured from live animals. This study shows that there is no evidence of convergence for either Tursiops or Phocoena as the sound propagates from near-field to far-field. [ABSTRACT FROM AUTHOR]

Published
2019

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