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provements in computer-processing power and data-trans- fer bandwidth are allowing the emergence of high-speed imaging methods based on unfocused plane and diverging waves. Overall, these are exciting times for medical ultra- sound imaging that continues to offer surprises, considering that the basic methods of ultrasound imaging were perfect- ed many decades ago.
Portions of this work were supported by Grant EY025215 from the National Eye Institute, National Institutes of Health, to Ronald H. Silverman and Grant EY024434 from the National Eye Institute and Grant EB022950 from the Na- tional Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, to Jeffrey A. Ketterling. We thank Raksha Urs and Orlando Aristizábal for helpful input and discussions.
Jeffrey A. Ketterling is the associate research director of the Frederic Lizzi Center for Biomedical Engineering at the Riverside Research Institute in New York, NY. His past work has focused on high-frequency ultrasound and, in par- ticular, high-frequency annular arrays
for small-animal and ophthalmic imaging applications. He was the technical chair of the Biomedical Acoustics Com- mittee of the Acoustical Society of America (ASA) from 2008 to 2011 and is a Fellow of the ASA. He received his PhD degree in mechanical engineering from Yale University, New Haven, CT, in 1999.
Ronald Silverman is a professor of oph- thalmic science at Columbia University Medical Center (CUMC) in New York, NY. His postgraduate training was in bioengineering and computer science at Polytechnic University in Brooklyn, NY. After 28 years of research and the clini-
cal application of ultrasound in the Department of Ophthal- mology at Weill-Cornell Medical Center in New York, NY, he moved to the Harkness Eye Institute of CUMC, where he continues his research in ultrasound for imaging the eye. His primary interests now include high-frequency ultrasound for biometric and biomechanical mapping of the cornea and ultrafast imaging of ocular blood flow.
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