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1,786 results on '"Dayton, Paul A."'

2. Low-boiling-point perfluorocarbon nanodroplets for adaptable ultrasound-induced blood-brain barrier opening

Author

Dauba, Ambre, Spitzlei, Claire, Bautista, Kathlyne Jayne B., Jourdain, Laurène, Selingue, Erwan, VanTreeck, Kelly E., Mattern, Jacob A., Denis, Caroline, Ouldali, Malika, Arteni, Ana-Andreea, Truillet, Charles, Larrat, Benoit, Tsuruta, James, Durham, Phillip G., Papadopoulou, Virginie, Dayton, Paul A., Tsapis, Nicolas, and Novell, Anthony

Published
2024
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6. Quantitative sub-resolution blood velocity estimation using ultrasound localization microscopy ex-vivo and in-vivo

Author

Espindola, David, DeRuiter, Ryan M., Santibanez, Francisco, Dayton, Paul A., and Pinton, Gianmarco

Subjects
Physics - Medical Physics
Abstract

Super-resolution ultrasound imaging relies on the sub-wavelength localization of microbubble contrast agents. By tracking individual microbubbles, the velocity and flow within microvessels can be estimated. However, a 2D super-resolution image can only localize bubbles with sub-wavelength resolution in the imaging plane whereas the resolution in the elevation plane is limited by conventional beamwidth physics. Since ultrasound imaging integrates echoes over the elevation dimension, velocity estimates at a single location in the imaging plane include information throughout the imaging slice thickness. This slice thickness is typically a few orders or magnitude larger than the super-resolution limit. It is shown here that in order to estimate the velocity, a spatial integration over the elevation direction must be considered. This operation yields a multiplicative correction factor that compensates for the elevation integration. A correlation-based velocity estimation technique is then presented. Calibrated microtube phantom experiments are used to validate the proposed velocity estimation method and the proposed elevation integration correction factor. It is shown that velocity measurements are in agreement with theoretical predictions within the considered range of flow rates (10 to 90 $\mu$L/min). Then, the proposed technique is applied to two in-vivo mouse tail experiments imaged with a low frequency human clinical transducer with human clinical concentrations of microbubbles. In the first experiment, a vein was visible with a diameter of 140 $\mu$m and a peak flow velocity of 0.8 mm/s. In the second experiment, a vein was observed in the super-resolved image with a diameter of 120~$\mu$m and with maximum local velocity of $\approx$~4.4~mm/s. It is shown that the parabolic flow profiles within these micro-vessels are resolvable.

Published
2020

12. Super resolution imaging through the human skull

Author

Soulioti, Danai E., Espíndola, David, Dayton, Paul A., and Pinton, Gianmarco

Subjects
Physics - Medical Physics, Condensed Matter - Soft Condensed Matter
Abstract

High resolution transcranial ultrasound imaging in humans has been a persistent challenge for ultrasound due to the imaging degradation effects from aberration and reverberation. These mechanisms depend strongly on skull morphology and they have high variability across individuals. Here we demonstrate the feasibility of human transcranial super-resolution imaging using a geometrical focusing approach to concentrate energy at the region of interest, and a phase correction focusing approach that takes the skull morphology into account. It is shown that using the proposed focused method, we can image a 208$\mu$m microtube behind a human skull phantom in both an out-of-plane and an in-plane configuration. Individual phase correction profiles for the temporal region of the human skull were calculated and applied to transmit-receive a custom-focused super-resolution imaging sequence through a human skull phantom, targeting the microtube, at 68.5mm in depth, at 2.5 MHz. Microbubble contrast agents were diluted to a concentration of 1.6$\times$10$^6$ bubbles/mL and perfused through the microtube. It is shown that by correcting for the skull aberration, the RF signal amplitude from the tube improved by a factor of 1.6 in the out-of-plane focused emission case. The lateral registration error of the tube's position, which in the uncorrected case was 990 $\mu$m, was reduced to 50$\mu$m in the corrected case as measured in the B-mode images. Sensitivity in microbubble detection for the phase corrected case increased by a factor of 1.5 in the out-of-plane imaging case, while in the in-plane case it improved by a factor of 1.3 while achieving an axial registration correction from an initial 1885$\mu$m error for the uncorrected emission, to a 284$\mu$m error for the corrected counterpart. These findings suggest that super-resolution may be used more generally as a clinical imaging modality in the brain., Comment: Submitted to IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

Published
2018

13. One- and Two-Year Analysis of a Five-Year Prospective Multicenter Study Assessing Radiographic and Patient-Reported Outcomes Following Triplanar First Tarsometatarsal Arthrodesis With Early Weightbearing for Symptomatic Hallux Valgus

Author

Liu, George T., Chhabra, Avneesh, Dayton, Mindi J., Dayton, Paul D., Duke, William J., Farber, Daniel C., Hatch, Daniel J., Kile, Deidre A., Koay, Jennifer, McAleer, Jody P., Raissi, Abdi, Raspovic, Katherine M., Santrock, Robert D., Taylor, Robert P., VanPelt, Michael D., and Wukich, Dane K.

Published
2022
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18. Kelpbeds as Classrooms: Perspectives and Lessons Learned

Author

Pearse, John S, Carr, Mark H., Baxter, Charles H., Watanabe, James M., Foster, Michael S, Steller, Diana L., Coyer, James A., Konar, Brenda, Duggins, David O., Dayton, Paul K., and Smithsonian Libraries and Archives

Published
2013

19. Scuba Revolutionizes Marine Science

Author

Witman, Jon D., Dayton, Paul K., Arnold, Suzanne N., Steneck, Robert S., Birkeland, Charles, and Smithsonian Libraries and Archives

Published
2013

20. Kelp Forests in California

Author

Foster, Michael S, Reed, Daniel C, Carr, Mark H., Dayton, Paul K., Malone, Daniel P., Pearse, John S, Rogers-Bennett, Laura, and Smithsonian Libraries and Archives

Published
2013

37. Super-resolution Ultrasound Imaging

Author

Christensen-Jeffries, Kirsten, Couture, Olivier, Dayton, Paul A., Eldar, Yonina C., Hynynen, Kullervo, Kiessling, Fabian, O'Reilly, Meaghan, Pinton, Gianmarco F., Schmitz, Georg, Tang, Meng-Xing, Tanter, Mickael, and van Sloun, Ruud J.G.

Published
2020
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42. Rossella podagrosa Kirkpatrick, 1907-A valid species after all.

Author

Göcke, Christian, Janussen, Dorte, Reiswig, Henry M, Jarrell, Shannon C, and Dayton, Paul K

Subjects
Animal Structures, Animals, Porifera, Antarctic Regions, Oceans and Seas, Hexactinellida, Rossellidae, Synonymy, Antarctica, Ross Sea, Zoology, Evolutionary Biology
Abstract

In this study we provide evidence that the species Rossella podagrosa Kirkpatrick, 1907, commonly considered a synonym of Rossella racovitzae Topsent, 1901, is truly a valid species. We show that it can be clearly distinguished from other species especially when taking into consideration the in situ habitus of the sponge in combination with the spicules. Furthermore we demonstrate the weaknesses in the so far published synonymy concept for the very complicated genus Rossella Carter, 1872. From this we conclude that the best strategy for further analysis of Rossella and establishment of acceptable synonymies will need to be based on detailed examination of the spicules, the holotypes, and in situ habitus. When possible it will be useful to analyze specimens from all Antarctic oceanographic regions.

Published
2015

46. Contributors

Author

Aime, Silvio, primary, Amirshaghaghi, Ahmad, additional, Angel, Peggi M., additional, Ardenkjaer-Larsen, Jan H., additional, Atreya, Raja, additional, Awe, Sunny, additional, Badea, Cristian T., additional, Beekman, Freek J., additional, Biade, Siham, additional, Borden, Mark A., additional, Brunsing, Ryan L., additional, Chandrasekharan, Prashant, additional, Chang, Jae-Byum, additional, Chen, Fei, additional, Chen, John W., additional, Chen, Xiaogyuan, additional, Cheng, Zhen, additional, Cheng, Zhiliang, additional, Cherin, Emmanuel, additional, Clinthorne, Neal H., additional, Cohen, Jonathan, additional, Colson, Caylin, additional, Conolly, Steven, additional, Contag, Christopher H., additional, Cutler, Cathy S., additional, Dayton, Paul A., additional, Devoogdt, Nick, additional, Dina, Olayinka, additional, Drake, Richard R., additional, Dubsky, Stephen, additional, Ducongé, Frédéric, additional, Fellows, Benjamin D., additional, Foster, F. Stuart, additional, Francis, Kevin P., additional, Fung, Barry K.L., additional, Gambhir, Sanjiv Sam, additional, Gao, Ruixuan, additional, Giovenzana, Giovanni B., additional, Goodwill, Patrick, additional, Goorden, Marlies C., additional, Gorpas, Dimitris, additional, Grimm, Jan, additional, Groll, Andrew N., additional, Hargus, Sally, additional, Harmsen, Stefan, additional, He, Shuqing, additional, Hensley, Daniel, additional, Hutton, Brian F., additional, Huynh, Quincy, additional, Iagaru, Andrei, additional, Josephson, Lee, additional, Jurisson, Silvia S., additional, Keselman, Paul, additional, Kircher, Moritz F., additional, Kokate, Tushar, additional, Konkle, Justin, additional, Korsen, Joshua A., additional, Krasniqi, Ahmet, additional, Laniyonu, Adebayo, additional, Levin, Craig S., additional, Lewis, Michael R., additional, Lewis, Jason S., additional, Liu, Guanshu, additional, Liu, Yajing, additional, Looger, Loren L., additional, Lu, Kuan, additional, Lu, Yao, additional, Lucignani, Giovanni, additional, Lyons, Scott K., additional, Maina, Theodosia, additional, Martelli, Cristina, additional, Matheson, Alexander M., additional, Mempel, Thorsten R., additional, Meng, Ling-Jian, additional, Moradi, Farshad, additional, Nagle, Veronica L., additional, Neurath, Markus F., additional, Nicolson, Fay, additional, Nie, Liming, additional, Ntziachristos, Vasilis, additional, Orendorff, Ryan, additional, Ottobrini, Luisa, additional, Ouyang, Yanli, additional, Paez Segala, Maria G., additional, Parraga, Grace, additional, Perez-Liva, Mailyn, additional, Pratt, Edwin C., additional, Rao, Jianghong, additional, Rath, Timo, additional, Rodriguez, Elisenda, additional, Rosenthal, Eben L., additional, Ross, Brian D., additional, Saayujya, Chinmoy, additional, Saritas, Emine Ulku, additional, Scott, Danielle A., additional, Sheth, Vipul R., additional, Slagle, Connor, additional, Tamura, Ryo, additional, Tavitian, Bertrand, additional, Tay, Zhi Wei, additional, Terreno, Enzo, additional, Thakur, Mathew, additional, Thompson, Caleb, additional, Tian, Jie, additional, Travagin, Fabio, additional, Tsourkas, Andrew, additional, Tully, Kathryn M., additional, Usmani, Shariq M., additional, VanBrocklin, Henry F., additional, van Keulen, Stan, additional, van Zijl, Peter C.M., additional, Walmer, Rachel W., additional, Wang, Cuihua, additional, Wang, Joanna, additional, Wang, Lihong V., additional, Xavier, Catarina, additional, Yao, Junjie, additional, Yu, Elaine Y., additional, Zheng, Xianchuang, additional, Zheng, Bo, additional, and Zhou, Xinyi Y., additional

Published
2021
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