1,161 research outputs found
Acute anaphylaxis following exercise stress testing
No full textThe definitive version is available at www.blackwell-synergy.comP. J. Psaltis, B. K. Dundon, D. P. Leon
Second-harmonic radiating imaging probes and harmonic holography
No full textCompared with other imaging probes such as fluorescent dyes and quantum dots, second-harmonic radiating imaging probes (SHRIMPs) provide a unique ultrafast, coherent optical contrast that is free of photobleaching and emission intermittency. Using the second-harmonic signal emitted from SHRIMPs, harmonic holography achieves three-dimensional holographic imaging with a color contrast similar to fluorescence microscopy where the uninterested background scattering is efficiently suppressed by an optical filter. The coherent contrast provided by SHRIMPs also enables imaging through turbid media via digital phase conjugation. Here we review the developments and applications of SHRIMPs and harmonic holography.L
Is spontaneous coronary artery dissection (SCAD) related to vascular inflammation and epicardial fat? —insights from computed tomography coronary angiography
No full textAbstract not available.Jeremy Yuvaraj, Andrew Lin, Nitesh Nerlekar, Hashrul Rashid, James D. Cameron, Sujith Seneviratne, Stephen Nicholls, Peter J. Psaltis, Dennis T.L. Won
Diagnostic accuracy of ASLA score (a novel CT angiographic index) and aggregate plaque volume in the assessment of functional significance of coronary stenosis
No full textAvailable online 8 June 2018Abstract not availableRavi Kiran Munnur, James D. Cameron, Liam M. McCormick, Peter J. Psaltis, Nitesh Nerlekar, Brian S.H. Ko, Ian T. Meredith, Sujith Seneviratne, Dennis T.L. Won
Digital reverse propagation in focusing Kerr media
No full textLenses allow the formation of clear images in homogeneous linear media. Holography is an alternative imaging method, but its use is limited to cases in which it provides an advantage, such as three-dimensional imaging. In nonlinear media, lenses no longer work. The light produces intensity-dependent aberrations. The reverse propagation method used in digital holography to form images from recorded holograms works even in Kerr media [M. Tsang, D. Psaltis, and F. G. Omenetto, Opt. Lett. 28, 1873 (2003).]. The principle has been experimentally demonstrated recently in defocusing media [C. Barsi, W. Wan, and J.W. Fleischer, Nat. Photonics 3, 211 (2009).]. Here, we report experimental results in focusing media.L
Comparison between three-dimensional angiographic reconstruction and intravascular ultrasound: imaging of the left main coronary artery
No full textAbstract not availableDaniel B. Spoon, Ronen Rubinshtein, Peter J. Psaltis, Gupreet S. Sandhu, Ryan Lennon, Charanjit S. Rihal and Amir Lerma
Assessment of regional myocardial function in rats using 1.5T cardiac magnetic resonance imaging
No full textAbstract 451J. Richardson, A. Bertaso, D. Wong, L. Frost, A. Carbone, A. Nelson, P. Psaltis, S. Paton, B. Koschade, K. Williams, M. Worthley, K. Teo, S. Gronthos, A. Zannettino, S.Worthle
Association of intracellular Staphylococcus aureus with prognosis in chronic rhinosinusitis
No full textAbstract not availableJudy Ou, Amanda Drilling, Deepti Singhal, Neil C.-W. Tan, Deanna Wallis-Hill, Sarah Vreugde, Alkis J. Psaltis, and Peter-John Wormal
Light modulation enabled by liquid crystal microflows
No full textIn a previous paper,1we proposed an optofluidic modulator based on peristaltic flow. A microchannel made of polydimethylsiloxane is filled with nematic liquid crystal molecules that align homeotropically in the steady state. Once we apply a periodic peristaltic flow through mechanical deformation of the channel, liquid crystal molecules tend to realign with the gradient velocity field and thus change their optical properties. In this paper, we focus on the channel deformation with the finite elements program Comsol®, and we highlight the limitations in frequency of such optofluidic components. © World Scientific Publishing Company
Vascular wall progenitor cells in health and disease
No full textThe vasculature plays an indispensible role in organ development and maintenance of tissue homeostasis, such that disturbances to it impact greatly on developmental and postnatal health. Although cell turnover in healthy blood vessels is low, it increases considerably under pathological conditions. The principle sources for this phenomenon have long been considered to be the recruitment of cells from the peripheral circulation and the re-entry of mature cells in the vessel wall back into cell cycle. However, recent discoveries have also uncovered the presence of a range of multipotent and lineage-restricted progenitor cells in the mural layers of postnatal blood vessels, possessing high proliferative capacity and potential to generate endothelial, smooth muscle, hematopoietic or mesenchymal cell progeny. In particular, the tunica adventitia has emerged as a progenitor-rich compartment with niche-like characteristics that support and regulate vascular wall progenitor cells. Preliminary data indicate the involvement of some of these vascular wall progenitor cells in vascular disease states, adding weight to the notion that the adventitia is integral to vascular wall pathogenesis, and raising potential implications for clinical therapies. This review discusses the current body of evidence for the existence of vascular wall progenitor cell subpopulations from development to adulthood and addresses the gains made and significant challenges that lie ahead in trying to accurately delineate their identities, origins, regulatory pathways, and relevance to normal vascular structure and function, as well as disease.Peter J. Psaltis, Robert D. Simar
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