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https://www.readbyqxmd.com/read/28332315/significant-increase-of-flow-kinetic-energy-in-nonresponders-patients-to-cardiac-resynchronization-therapy
#1
Sara Cimino, Dino Palombizio, Francesco Cicogna, Donatella Cantisani, Manuela Reali, Domenico Filomena, Valentina Petronilli, Carlo Iacoboni, Luciano Agati
BACKGROUNDS: It's still unclear if different patterns of intraventricular flow dynamics may be detected in patients nonresponders to cardiac resynchronization therapy (CRT) as compared to responders ones. Aim of this study was to evaluate the characteristics of left ventricular (LV) flow dynamics 6-months after CRT to identify Echo-particle imaging velocity (PIV) patterns were more frequently detected in nonresponders patients. METHODS: Thirty-two patients with dilated cardiomyopathy, undergoing CRT, were enrolled in this study...
March 23, 2017: Echocardiography
https://www.readbyqxmd.com/read/28324775/investigation-of-the-ultrasonic-attenuation-in-anisotropic-weld-materials-with-finite-element-modeling-and-grain-scale-material-description
#2
P E Lhuillier, B Chassignole, M Oudaa, S O Kerhervé, F Rupin, T Fouquet
A finite element modeling approach of ultrasonic propagation combined with a description of the microstructure at the scale of the grains has been implemented. The simulations seek to determine the contribution of scattering to the ultrasonic attenuation in polycrystalline materials. The approach is applied to anisotropic microstructures exhibiting both elongated grains and transversely isotropic crystallographic texture which can be found in multipass welds. The ultrasonic propagation is computed with the 2D finite element code ATHENA 2D...
March 8, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28320412/high-resolution-hemodynamic-profiling-of-murine-arteriovenous-fistula-using-magnetic-resonance-imaging-and-computational-fluid-dynamics
#3
Daniel Pike, Yan-Ting Shiu, Maheshika Somarathna, Lingling Guo, Tatyana Isayeva, John Totenhagen, Timmy Lee
BACKGROUND: Arteriovenous fistula (AVF) maturation failure remains a major cause of morbidity and mortality in hemodialysis patients. The two major etiologies of AVF maturation failure are early neointimal hyperplasia development and persistent inadequate outward remodeling. Although hemodynamic changes following AVF creation may impact AVF remodeling and contribute to neointimal hyperplasia development and impaired outward remodeling, detailed AVF hemodynamics are not yet fully known...
March 20, 2017: Theoretical Biology & Medical Modelling
https://www.readbyqxmd.com/read/28318066/three-dimensional-ultrashort-echo-time-cones-t1%C3%AF-3d-ute-cones-t1%C3%AF-imaging
#4
Ya-Jun Ma, Michael Carl, Hongda Shao, Anthony S Tadros, Eric Y Chang, Jiang Du
We report a novel three-dimensional (3D) ultrashort echo time (UTE) sequence employing Cones trajectory and T1ρ preparation (UTE-Cones-T1ρ ) for quantitative T1ρ assessment of short T2 tissues in the musculoskeletal system. A basic 3D UTE-Cones sequence was combined with a spin-locking preparation pulse for T1ρ contrast. A relatively short TR was used to decrease the scan time, which required T1 measurement and compensation using 3D UTE-Cones data acquisitions with variable TRs. Another strategy to reduce the total scan time was to acquire multiple Cones spokes (Nsp ) after each T1ρ preparation and fat saturation...
March 20, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28299710/high-resolution-microultrasound-%C3%AE-us-investigation-of-the-gastrointestinal-gi-tract
#5
Thineskrishna Anbarasan, Christine E M Démoré, Holly Lay, Mohammed R S Sunoqrot, Romans Poltarjonoks, Sandy Cochran, Benjamin F Cox
High resolution, microultrasound (μUS) scanning of the gastrointestinal (GI) tract has potential as an important transmural imaging modality to aid in diagnosis. Operating at higher frequencies than conventional clinical ultrasound instruments, μUS is capable of providing scanned images of the GI tract with higher resolution. To investigate the use of μUS for this application, a phantom which is cost effective, within ethical guidelines and, most importantly, similar in histology to the human GI tract is necessary...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28295563/in-vivo-mri-of-the-human-finger-at-7-t
#6
Elmar Laistler, Barbara Dymerska, Jürgen Sieg, Sigrun Goluch, Roberta Frass-Kriegl, Andre Kuehne, Ewald Moser
PURPOSE: To demonstrate a dedicated setup for ultrahigh resolution MR imaging of the human finger in vivo. METHODS: A radiofrequency coil was designed for optimized signal homogeneity and sensitivity in the finger at ultrahigh magnetic field strength (7 T), providing high measurement sensitivity. Imaging sequences (2D turbo-spin echo (TSE) and 3D magnetization-prepared rapid acquisition gradient echo (MPRAGE)) were adapted for high spatial resolution and good contrast of different tissues in the finger, while keeping acquisition time below 10 minutes...
March 10, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28294860/-coronary-flow-reserve-in-the-left-anterior-and-posterior-descending-arteries-as-an-additional-option-to-dipyridamole-stress-echocardiography-for-detection-of-stenosis
#7
A A Boshchenko, A V Vrublevsky, R S Karpov
AIM: to assess additive diagnostic value of simultaneous evaluation of coronary flow reserve (CFR) in the left anterior descending (LAD) artery and posterior descending artery (PDA) during dipyridamole stress echocardiography (stress-Echo) for detection of LAD and PDA stenoses >50%. METHODS: 108 in-patients (mean age 50+/-11 years) with cardiac chest pain underwent dipyridamole stress-Echo with ECG-analysis, wall motion analysis by 2-dimentional imaging (2D) and coronary flow reserve (CFR) evaluation in both LAD and PDA by pulse-wave Doppler...
April 2016: Kardiologiia
https://www.readbyqxmd.com/read/28292302/impact-of-left-ventricular-outflow-tract-ellipticity-on-the-grading-of-aortic-stenosis-in-patients-with-normal-ejection-fraction
#8
Frédéric Maes, Sophie Pierard, Christophe de Meester, Jamila Boulif, Mihaela Amzulescu, David Vancraeynest, Anne-Catherine Pouleur, Agnès Pasquet, Bernhard Gerber, Jean-Louis Vanoverschelde
BACKGROUND: The pathophysiology of paradoxical low-gradient (LG) severe aortic stenosis (SAS) remains controversial. As low transvalvular flow has been implicated, we sought to investigate the impact of left ventricular outflow tract (LVOT) ellipticity on the estimation of the LV stroke volume, the calculation of the aortic valve area (AVA) by use of the continuity equation and on AS severity grading. METHODS: We studied 190 consecutive patients (mean age: 72 ± 13 years; male: 57%) with SAS (indexed AVA < 0...
March 15, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28284205/usage-of-3d-models-of-tetralogy-of-fallot-for-medical-education-impact-on-learning-congenital-heart-disease
#9
RANDOMIZED CONTROLLED TRIAL
Yue-Hin Loke, Ashraf S Harahsheh, Axel Krieger, Laura J Olivieri
BACKGROUND: Congenital heart disease (CHD) is the most common human birth defect, and clinicians need to understand the anatomy to effectively care for patients with CHD. However, standard two-dimensional (2D) display methods do not adequately carry the critical spatial information to reflect CHD anatomy. Three-dimensional (3D) models may be useful in improving the understanding of CHD, without requiring a mastery of cardiac imaging. The study aimed to evaluate the impact of 3D models on how pediatric residents understand and learn about tetralogy of Fallot following a teaching session...
March 11, 2017: BMC Medical Education
https://www.readbyqxmd.com/read/28282904/high-resolution-turntable-radar-imaging-via-two-dimensional-deconvolution-with-matrix-completion
#10
Xinfei Lu, Jie Xia, Zhiping Yin, Weidong Chen
Resolution is the bottleneck for the application of radar imaging, which is limited by the bandwidth for the range dimension and synthetic aperture for the cross-range dimension. The demand for high azimuth resolution inevitably results in a large amount of cross-range samplings, which always need a large number of transmit-receive channels or a long observation time. Compressive sensing (CS)-based methods could be used to reduce the samples, but suffer from the difficulty of designing the measurement matrix, and they are not robust enough in practical application...
March 8, 2017: Sensors
https://www.readbyqxmd.com/read/28270208/aortic-length-measurements-for-pulse-wave-velocity-calculation-manual-2d-vs-automated-3d-centreline-extraction
#11
Arna van Engelen, Miguel Silva Vieira, Isma Rafiq, Marina Cecelja, Torben Schneider, Hubrecht de Bliek, C Alberto Figueroa, Tarique Hussain, Rene M Botnar, Jordi Alastruey
BACKGROUND: Pulse wave velocity (PWV) is a biomarker for the intrinsic stiffness of the aortic wall, and has been shown to be predictive for cardiovascular events. It can be assessed using cardiovascular magnetic resonance (CMR) from the delay between phase-contrast flow waveforms at two or more locations in the aorta, and the distance on CMR images between those locations. This study aimed to investigate the impact of different distance measurement methods on PWV. We present and evaluate an algorithm for automated centreline tracking in 3D images, and compare PWV calculations using distances derived from 3D images to those obtained from a conventional 2D oblique-sagittal image of the aorta...
March 8, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28256251/relation-of-right-atrial-volume-systemic-venous-dimensions-and-flow-patterns-to-right-atrial-pressure-in-infants-and-children
#12
Shivani G Patel, Peter Woolman, Ling Li, Mary Craft, David A Danford, Shelby Kutty
Echocardiographic assessment of right atrial (RA) volume, inferior vena cava (IVC) diameter, and hepatic vein flow velocity independently correlate with the RA pressure by direct catheter measurement in adults. We prospectively collected invasive RA pressure measurements and echocardiographic data in infants and young children with the goal of developing a predictive model to noninvasively determine normal RA pressure. All subjects had a central venous catheter through which RA pressure could be transduced...
February 10, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28250684/acute-st-segment-elevation-myocardial-infarction-the-prognostic-importance-of-lead-augmented-vector-right-and-leads-v7-v9
#13
Veeresh Patil Hebbal, Huliyurdurga Srinivasasetty Natraj Setty, Cholenahalli Manjunath Sathvik, Vikram Patil, Sarthak Sahoo, Cholenahalli Nanjappa Manjunath
BACKGROUND: Acute myocardial infarction (MI) is associated with high mortality and among survivors have high morbidity. Electrocardiogram (ECG), a cost-effective and easily available, has traditionally been used not only just for diagnosis of MI but also for culprit vessel recognition and for prognostication. However, the role of lead augmented vector right (aVR) and leads V7-V9 in acute MI are often neglected in clinical practice. We studied the role of lead aVR and leads V7-V9 in ST-elevation MI (STEMI) patients...
January 2017: Journal of Natural Science, Biology, and Medicine
https://www.readbyqxmd.com/read/28225576/3d-multiecho-dixon-for-the-evaluation-of-hepatic-iron-and-fat-in-a-clinical-setting
#14
Benjamin Henninger, Heinz Zoller, Stephan Kannengiesser, Xiaodong Zhong, Werner Jaschke, Christian Kremser
PURPOSE: To prospectively evaluate a new 3D-multiecho-Dixon (3D-ME-Dixon) sequence for the quantification of hepatic iron and fat in a clinical setting. MATERIALS AND METHODS: In all, 120 patients underwent 1.5T magnetic resonance imaging of the liver between December 2013 and June 2015 including the following three sequences: 3D-ME-Dixon with inline calculation of R2* and proton-density fat-fraction (PDFF) maps, single-voxel-spectroscopy (SVS), 2D multigradient-echo sequence (2D-ME-GRE)...
February 22, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28221356/terahertz-echoes-reveal-the-inhomogeneity-of-aqueous-salt-solutions
#15
Andrey Shalit, Saima Ahmed, Janne Savolainen, Peter Hamm
The structural and dynamical properties of water are known to be affected by ion solvation. However, a consistent molecular picture that describes how and to what extent ions perturb the water structure is still missing. Here we apply 2D Raman-terahertz spectroscopy to investigate the impact of monatomic cations on the relaxation dynamics of the hydrogen-bond network in aqueous salt solutions. The inherent ability of multidimensional spectroscopy to deconvolute heterogeneous relaxation dynamics is used to reveal the correlation between the inhomogeneity of the collective intermolecular hydrogen-bond modes and the viscosity of a salt solution...
March 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28220617/wave-caipi-for-highly-accelerated-mp-rage-imaging
#16
Daniel Polak, Kawin Setsompop, Stephen F Cauley, Borjan A Gagoski, Himanshu Bhat, Florian Maier, Peter Bachert, Lawrence L Wald, Berkin Bilgic
PURPOSE: To introduce a highly accelerated T1-weighted magnetization-prepared rapid gradient echo (MP-RAGE) acquisition that uses wave-controlled aliasing in parallel imaging (wave-CAIPI) encoding to retain high image quality. METHODS: Significant acceleration of the MP-RAGE sequence is demonstrated using the wave-CAIPI technique. Here, sinusoidal waveforms are used to spread aliasing in all three directions to improve the g-factor. Combined with a rapid (2 s) coil sensitivity acquisition and data-driven trajectory calibration, we propose an online integrated acquisition-reconstruction pipeline for highly efficient MP-RAGE imaging...
February 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28219648/direct-magnitude-and-phase-imaging-of-myelin-using-ultrashort-echo-time-ute-pulse-sequences-a-feasibility-study
#17
Qun He, Yajun Ma, Shujuan Fan, Hongda Shao, Vipul Sheth, Graeme M Bydder, Jiang Du
In this paper, we aimed to investigate the feasibility of direct visualization of myelin, including myelin lipid and myelin basic protein (MBP), using two-dimensional ultrashort echo time (2D UTE) sequences and utilize phase information as a contrast mechanism in phantoms and in volunteers. The standard UTE sequence was used to detect both myelin and long T2 signal. An adiabatic inversion recovery UTE (IR-UTE) sequence was used to selectively detect myelin by suppressing signal from long T2 water protons. Magnitude and phase imaging and T2* were investigated on myelin lipid and MBP in the forms of lyophilized powders as well as paste-like phantoms with the powder mixed with D2O, and rubber phantoms as well as healthy volunteers...
February 17, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28216518/optimization-of-t1-weighted-imaging-parameters-in-mr-carotid-plaque-imaging-influence-for-the-quantitative-evaluation-among-different-mri-scanner-types
#18
Takanori Naka, Mitsuyuki Takahashi, Koutarou Takeda, Tarou Igarashi, Tetsukazu Hondera
Carotid artery plaques with high-signal intensity on T1 weighted image (T1 WI) are known to cause cerebral ischemic disease. Signal intensity ratio (SIR), which is calculated from T1 WI in the quantitative evaluation of plaque characterization have been used. However, the various sequences in T1 WI and difference in the sequences were utilized among institutions. Therefore, difference in sequence may influence SIR. The purpose of this study was to evaluate the optimization of T1 WI sequence in MR carotid plaque imaging...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28210715/feasibility-and-reproducibility-of-two-dimensional-wall-motion-tracking-wmt-in-fetal-echocardiography
#19
Christian Enzensberger, Friederike Achterberg, Jan Degenhardt, Aline Wolter, Oliver Graupner, Johannes Herrmann, Roland Axt-Fliedner
Objective The primary objective of this study was to determine the feasibility and reproducibility of 2-dimensional speckle tracking imaging based on the wall motion tracking (WMT) technique in fetal echocardiography. The secondary objective was to compare left and right ventricular global and segmental longitudinal peak strain values. Methods A prospective cross-sectional study was performed. Global and segmental longitudinal peak strain values of the left ventricle (LV) and right ventricle (RV) were assessed prospectively...
February 2017: Ultrasound International Open
https://www.readbyqxmd.com/read/28207657/3-tesla-kinematic-mri-of-the-cervical-spine-for-evaluation-of-adjacent-level-disease-after-monosegmental-anterior-cervical-discectomy-and-arthroplasty-results-of-2-year-follow-up
#20
Steffen K Fleck, Soenke Langner, Christian Rosenstengel, Rebecca Kessler, Marc Matthes, Jan-Uwe Müller, Inga Langner, Sascha Marx, Henry W S Schroeder
STUDY DESIGN: We prospectively evaluated adjacent disc levels after anterior cervical discectomy and arthroplasty (ACDA) using kinematic magnetic resonance imaging (MRI) and plain functional radiographs. OBJECTIVE: ACDA is an established treatment for degenerative cervical disc disease. The objective of this study was to evaluate the use of kinematic MRI for assessing the range of motion (ROM) before and after ACDA compared with plain functional radiographs and to evaluate adjacent degenerative disc disease (aDDD) at mid-term follow-up...
February 15, 2017: Spine
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