scholarly journals Automated analysis of three-dimensional stress echocardiography

2011 ◽  
Vol 19 (6) ◽  
pp. 307-310 ◽  
Author(s):  
K. Y. E. Leung ◽  
M. van Stralen ◽  
M. G. Danilouchkine ◽  
G. van Burken ◽  
M. L. Geleijnse ◽  
...  
Keyword(s):  
Stress Echocardiography ◽  
Three Dimensional ◽  
Automated Analysis

scholarly journals Automated analysis of three-dimensional xylem networks using high-resolution computed tomography

2011 ◽  
Vol 191 (4) ◽  
pp. 1168-1179 ◽  
Author(s):  
Craig R. Brodersen ◽  
Eric F. Lee ◽  
Brendan Choat ◽  
Steven Jansen ◽  
Ronald J. Phillips ◽  
...  
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Three Dimensional ◽  
Automated Analysis ◽  
High Resolution Computed Tomography

scholarly journals Quantitative Assessment of Myocardial Ischemia in Multi-Vessel Coronary Artery Disease by Multimodal Stress Echocardiography with Semi-Supine Bicycle Ergometry

2020 ◽  
Vol 15 (6) ◽  
pp. 813-819
Author(s):  
S. N. Koretskiy ◽  
O. M. Drapkina ◽  
F. B. Shukurov ◽  
D. K. Vasiliev
Keyword(s):  
Stress Echocardiography ◽  
Peak Load ◽  
Three Dimensional ◽  
Ventricular Myocardium ◽  
Cardiovascular Complications ◽  
Artery Occlusion ◽  
Left Ventricular ◽  
Myocardial Imaging ◽  
Left Ventricular Myocardium ◽  
Bicycle Ergometry

Stress echocardiography is a modern widely used method of noninvasive diagnosis of coronary heart disease and stratification of the risk of cardiovascular complications. In addition, exercise echocardiography is an important tool to clarify the localization of ischemia and establish a symptomassociated artery for management of patient with known coronary angiography data. This is especially important in multivessel lesions, the presence of an occluded artery or borderline stenosis. Currently, various stress agents are used for stress echocardiography in clinical practice: pharmacological drugs (dobutamine or adenosine), transesophageal or endocardial pacing, treadmill, semi-supine bicycle. To detect signs of ischemia usually used only visual estimation of local contractility in the two-dimensional gray-scale mode. Modern modes of myocardial imaging, such as speckletracking echocardiography or three-dimensional visualization, are practically not used. In the presented clinical case, the possibility of combining standard and modern imaging modes to clarify the localization and quantification of ischemia in multivessel coronary lesions, including chronic artery occlusion, is shown. As a stress agent, a semi-supine bicycle was chosen, the use of which allowed to obtain a qualitative image of the left ventricular myocardium at rest and at peak load, suitable for assessing deformation and threedimensional visualization. Evaluation of left ventricular myocardial deformation by speckle-tracking echocardiography was more accurate than standard diagnosis in detecting signs of ischemia in a patient with multivessel lesions. Three-dimensional imaging was inferior in sensitivity to speckletracking stress echocardiography and, at present, seems to have more research value.

scholarly journals Automated Atom-By-Atom Three-Dimensional (3D) Reconstruction of Field Ion Microscopy Data

2017 ◽  
Vol 23 (2) ◽  
pp. 255-268 ◽  
Author(s):  
Michal Dagan ◽  
Baptiste Gault ◽  
George D. W. Smith ◽  
Paul A. J. Bagot ◽  
Michael P. Moody
Keyword(s):  
Three Dimensional ◽  
Reconstruction Algorithm ◽  
Automated Analysis ◽  
Atom Probe ◽  
Crystal Defects ◽  
Steel Matrix ◽  
Field Evaporation ◽  
Field Ion Microscopy ◽  
Ion Microscopy ◽  
Microscopy Data

AbstractAn automated procedure has been developed for the reconstruction of field ion microscopy (FIM) data that maintains its atomistic nature. FIM characterizes individual atoms on the specimen’s surface, evolving subject to field evaporation, in a series of two-dimensional (2D) images. Its unique spatial resolution enables direct imaging of crystal defects as small as single vacancies. To fully exploit FIM’s potential, automated analysis tools are required. The reconstruction algorithm developed here relies on minimal assumptions and is sensitive to atomic coordinates of all imaged atoms. It tracks the atoms across a sequence of images, allocating each to its respective crystallographic plane. The result is a highly accurate 3D lattice-resolved reconstruction. The procedure is applied to over 2000 tungsten atoms, including ion-implanted planes. The approach is further adapted to analyze carbides in a steel matrix, demonstrating its applicability to a range of materials. A vast amount of information is collected during the experiment that can underpin advanced analyses such as automated detection of “out of sequence” events, subangstrom surface displacements and defects effects on neighboring atoms. These analyses have the potential to reveal new insights into the field evaporation process and contribute to improving accuracy and scope of 3D FIM and atom probe characterization.

Sparse Registration for Three-Dimensional Stress Echocardiography

2008 ◽  
Vol 27 (11) ◽  
pp. 1568-1579 ◽  
Author(s):  
K. Y. Esther Leung ◽  
Marijn van Stralen ◽  
Attila Nemes ◽  
Marco M. Voormolen ◽  
Gerard van Burken ◽  
...  
Keyword(s):  
Stress Echocardiography ◽  
Three Dimensional

scholarly journals The CCP13FibreFixprogram suite: semi-automated analysis of diffraction patterns from non-crystalline materials

2007 ◽  
Vol 40 (1) ◽  
pp. 178-184 ◽  
Author(s):  
Ganeshalingam Rajkumar ◽  
Hind A. AL-Khayat ◽  
Felicity Eakins ◽  
Carlo Knupp ◽  
John M. Squire
Keyword(s):  
Structural Information ◽  
Protein Crystallography ◽  
Three Dimensional ◽  
Automated Analysis ◽  
Crystalline Materials ◽  
Space Groups ◽  
Naturally Occurring ◽  
Single User ◽  
Diffraction Patterns ◽  
User Friendly

The extraction of useful information from recorded diffraction patterns from non-crystalline materials is non-trivial and is not a well defined operation. Unlike protein crystallography where one expects to see well behaved diffraction spots in predictable positions defined by standard space groups, the diffraction patterns from non-crystalline materials are very diverse. They can range from uniaxially oriented fibre patterns which are completely sampled as Bragg peaks, but rotationally averaged around the fibre axis, to fibre patterns that are completely unsampled, to either kind of pattern with considerable axial misalignment (disorientation), to liquid-like order and even to mixtures of these various structure types. In the case of protein crystallography, the specimen is generated artificially and only used if the degree of order is sufficient to yield a three-dimensional density map of high enough resolution to be interpreted sensibly. However, with non-crystalline diffraction, many of the specimens of interest are naturally occurring (e.g.cellulose, rubber, collagen, muscle, hair, silk) and to elucidate their structure it is necessary to extract structural information from the materials as they actually are and to whatever resolution is available. Even when synthetic fibres are generated from purified components (e.g.nylon, polyethylene, DNA, polysaccharides, amyloidsetc.) and diffraction occurs to high resolution, it is rarely possible to obtain perfect uniaxial alignment. The CCP13 project was established in the 1990s to generate software which will be generally useful for analysis of non-crystalline diffraction patterns. Various individual programs were written which allowed separate steps in the analysis procedure to be carried out. Many of these programs have now been integrated into a single user-friendly package known asFibreFix, which is freely downloadable from http://www.ccp13.ac.uk. Here the main features ofFibreFixare outlined and some of its applications are illustrated.

Stress echocardiography using real-time three-dimensional imaging

2018 ◽  
Vol 35 (8) ◽  
pp. 1196-1203 ◽  
Author(s):  
Rafic F. Berbarie ◽  
Elie Dib ◽  
Masood Ahmad
Keyword(s):  
Real Time ◽  
Stress Echocardiography ◽  
Three Dimensional ◽  
Three Dimensional Imaging

Stress echocardiography: image acquisition and modalities

2016 ◽  
Author(s):  
Rosa Sicari ◽  
Edyta Płońska-Gościniak ◽  
Jorge Lowenstein
Keyword(s):  
Stress Echocardiography ◽  
Quantitative Methods ◽  
Wall Motion ◽  
Contrast Echocardiography ◽  
Image Interpretation ◽  
Three Dimensional ◽  
Visual Assessment ◽  
Tissue Doppler ◽  
Doppler Imaging ◽  
Endocardial Border

Stress echocardiography has evolved over the last 30 years but image interpretation remains subjective and burdened by the operator’s experience. The objective operator-independent assessment of myocardial ischaemia during stress echocardiography remains a technological challenge. Still, adequate quality of two-dimensional images remains a prerequisite to successful quantitative analysis, even using Doppler and non-Doppler based techniques. No new technology has proved to have a higher diagnostic accuracy than conventional visual wall motion analysis. Tissue Doppler imaging and derivatives may reduce inter-observer variability, but still require a dedicated learning curve and special expertise. The development of contrast media in echocardiography has been slow. In the past decade, transpulmonary contrast agents have become commercially available for clinical use. The approved indication for the use of contrast echocardiography currently lies in improving endocardial border delineation in patients in whom adequate imaging is difficult or suboptimal. Real-time three-dimensional echocardiography is potentially useful but limited by low spatial and temporal resolution. It is possible that these technologies may serve as an adjunct to expert visual assessment of wall motion. At present, these quantitative methods require further validation and simplification of analysis techniques.

Movement Based Classification of People with Stroke Through Automated Analysis of Three-Dimensional Motion Data

2018 ◽  
pp. 520-533
Author(s):  
John W. Kelly ◽  
Steve Leigh ◽  
Carol Giuliani ◽  
Rachael Brady ◽  
Martin J. McKeown ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Automated Analysis ◽  
Motion Data
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