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"Feature-tracking"

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https://www.readbyqxmd.com/read/29313213/effects-of-hyperaemia-on-left-ventricular-longitudinal-strain-in-patients-with-suspected-coronary-artery-disease-a%C3%A2-first-pass-stress-perfusion-cardiovascular-magnetic-resonance-imaging-study
#1
P Garg, R Aziz, T Al Musa, D P Ripley, P Haaf, J R J Foley, P P Swoboda, G J Fent, L E Dobson, J P Greenwood, S Plein
AIMS: Myocardial perfusion imaging during hyperaemic stress is commonly used to detect coronary artery disease. The aim of this study was to investigate the relationship between left ventricular global longitudinal strain (GLS), strain rate (GLSR), myocardial early (E') and late diastolic velocities (A') with adenosine stress first-pass perfusion cardiovascular magnetic resonance (CMR) imaging. METHODS AND RESULTS: 44 patients met the inclusion criteria and underwent CMR imaging...
January 8, 2018: Netherlands Heart Journal
https://www.readbyqxmd.com/read/29311562/imaging-4d-morphology-and-dynamics-of-mitral-annulus-in-humans-using-cardiac-cine-mr-feature-tracking
#2
Shuang Leng, Shuo Zhang, Meng Jiang, Xiaodan Zhao, Rui Wu, John Allen, Ben He, Ru San Tan, Liang Zhong
Feature tracking in cine cardiac magnetic resonance (CMR) is a quantitative technique to assess heart structure and function. We investigated 4-dimensional (4D) dynamics and morphology of the mitral annulus (MA) using a novel tracking system based on radially rotational long-axis cine CMR series. A total of 30 normal controls and patients with mitral regurgitation were enrolled. The spatiotemporal changes of the MA were characterized by an in-house developed program. Dynamic and morphological parameters extracted from all 18 radial slices were used as references and were compared with those from subsequently generated sub-datasets with different degrees of sparsity...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29283466/improved-segmental-myocardial-strain-reproducibility-using-deformable-registration-algorithms-compared-with-feature-tracking-cardiac-mri-and-speckle-tracking-echocardiography
#3
Jie Wang, Weihao Li, Jiayu Sun, Hong Liu, Yu Kang, Dan Yang, Liuyu Yu, Andreas Greiser, Xiaoyue Zhou, Yuchi Han, Yucheng Chen
BACKGROUND: Segmental myocardial strain using feature tracking (FT) cardiac MRI is not acceptable due to poor reproducibility. PURPOSE: To assess the reproducibility of left ventricle (LV) segmental myocardial strain measured by deformation registration algorithm (DRA). STUDY TYPE: Prospective clinical trial. SUBJECTS: Sixteen healthy volunteers and 28 hypertrophic cardiomyopathy (HCM) patients. FIELD STRENGTH/SEQUENCE: Retrospective ECG gating cardiac MRI imaging was performed at 3...
December 28, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29251556/express-the-impact-of-ambrisentan-and-tadalafil-upfront-combination-therapy-on-cardiac-function-in-patients-with-scleroderma-associated-pulmonary-arterial-hypertension-cardiac-magnetic-resonance-feature-tracking-study
#4
https://www.readbyqxmd.com/read/29241460/fractal-analysis-of-left-ventricular-trabeculations-is-associated-with-impaired-myocardial-deformation-in-healthy-chinese
#5
Jiashen Cai, Jennifer Ann Bryant, Thu-Thao Le, Boyang Su, Antonio de Marvao, Declan P O'Regan, Stuart A Cook, Calvin Woon-Loong Chin
BACKGROUND: Left ventricular (LV) non-compaction (LVNC) is defined by extreme LV trabeculation, but is measured variably. Here we examined the relationship between quantitative measurement in LV trabeculation and myocardial deformation in health and disease and determined the clinical utility of semi-automated assessment of LV trabeculations. METHODS: Cardiovascular magnetic resonance (CMR) was performed in 180 healthy Singaporean Chinese (age 20-69 years; males, n = 91), using balanced steady state free precession cine imaging at 3T...
December 14, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/29237468/left-ventricular-synchrony-torsion-and-recoil-mechanics-in-ebstein-s-anomaly-insights-from-cardiovascular-magnetic-resonance
#6
Michael Steinmetz, Simon Usenbenz, Johannes Tammo Kowallick, Olga Hösch, Wieland Staab, Torben Lange, Shelby Kutty, Joachim Lotz, Gerd Hasenfuß, Thomas Paul, Andreas Schuster
BACKGROUND: Disease progression and heart failure development in Ebstein's Anomaly (EA) of the tricuspid valve is characterized by both right and left ventricular (LV) deterioration. The mechanisms underlying LV dysfunction and their role in heart failure development are incompletely understood. We hypothesized that LV dyssynchrony and impaired torsion and recoil mechanics induced by paradoxical movement of the basal septum may play a role in heart failure development. METHODS: 31 EA patients and 31 matched controls underwent prospective cardiovascular magnetic resonance (CMR)...
December 14, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/29227821/scan-rescan-reproducibility-of-ventricular-and-atrial-mri-feature-tracking-strain
#7
Jérôme Lamy, Gilles Soulat, Morgane Evin, Adrian Huber, Alain de Cesare, Alain Giron, Benoit Diebold, Alban Redheuil, Elie Mousseaux, Nadjia Kachenoura
BACKGROUND: A feature tracking (FT) was designed to simultaneously extract myocardial strains in main cardiac chambers from cine MRI images. Its inter-observer and scan-rescan reproducibility was assessed and sample sizes required to detect predefined longitudinal changes in strain values were provided. METHOD: FT was applied on left (LV) and right (RV) ventricles as well as left atrium (LA) of 21 individuals (66 ± 10 years) who underwent 2 MRIs 2 weeks apart...
November 24, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29226213/reference-ranges-and-reproducibility-studies-for-right-heart-myocardial-deformation-by-feature-tracking-cardiovascular-magnetic-resonance-imaging
#8
Boyang Liu, Ahmed M Dardeer, William E Moody, Nicola C Edwards, Lucy E Hudsmith, Richard P Steeds
Feature tracking of the right heart on cardiac MRI is a novel and promising technique for the measurement of right heart myocardial strain. We present here the reference ranges for right ventricular longitudinal strain and strain rate, as well as peak strain of the right atrium within a cohort of 100 healthy individuals recruited from the UK. We present data on the reproducibility of these feature tracking techniques and explore relationship between strain and baseline demographic parameters.
February 2018: Data in Brief
https://www.readbyqxmd.com/read/29209744/preserved-myocardial-deformation-after-successful-coarctation-repair-a-cmr-feature-tracking-study
#9
Elles J Dijkema, Martijn G Slieker, Johannes M P J Breur, Tim Leiner, Heynric B Grotenhuis
Arterial vasculopathy and residual aortic obstruction can lead to left ventricular (LV) dysfunction in patients with coarctation of the aorta (CoA) related to adverse ventriculo-arterial coupling. This study aimed to investigate potential differences in LV myocardial deformation indices between repaired CoA patients and healthy controls. Twenty-two CoA patients (age 30 ± 10.6 years) after surgical repair (n = 12) or balloon angioplasty (BA) (n = 10) without residual stenosis, between 3 months and 16 years of age with > 10 years follow-up were compared to 22 healthy age- and gender-matched controls (age 30 ± 3...
December 5, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/29205626/feasibility-and-reproducibility-of-feature-tracking-based-strain-and-strain-rate-measures-of-the-left-ventricle-in-different-diseases-and-genders
#10
Alicia M Maceira, Luis Tuset-Sanchis, Miguel López-Garrido, Marta San Andres, M Pilar López-Lereu, Jose V Monmeneu, M Pilar García-González, Laura Higueras
BACKGROUND: The measurement of myocardial deformation by strain analysis is an evolving tool to quantify regional and global myocardial function. PURPOSE: To assess the feasibility and reproducibility of myocardial strain/strain rate measurements with magnetic resonance feature tracking (MR-FT) in healthy subjects and in patient groups. STUDY TYPE: Prospective study. POPULATION: Sixty patients (20 hypertensives with left ventricular (LV) hypertrophy (H); 20 nonischemic dilated cardiomyopathy (D); 20 ischemic heart disease (I); as well as 20 controls (C) were included, 10 men and 10 women in each group...
December 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29188318/myocardial-strain-using-cardiac-mr-feature-tracking-and-speckle-tracking-echocardiography-in-duchenne-muscular-dystrophy-patients
#11
Bryan Siegel, Laura Olivieri, Heather Gordish-Dressman, Christopher F Spurney
Duchenne muscular dystrophy (DMD) is an inherited X-linked disorder with an incidence of 1 in 3500 male births, and cardiomyopathy is becoming the leading cause of death. While Cardiac MRI (CMR) and late gadolinium enhancement (LGE) are important tools in recognizing myocardial involvement, myocardial strain imaging may demonstrate early changes and allow patients to avoid gadolinium contrast. We performed CMR feature tracking (FT) and echo-based speckle tracking (STE) strain measures on DMD patients and age/sex matched controls who had received a CMR with contrast and transthoracic echocardiogram...
November 29, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/29181827/reference-ranges-for-three-dimensional-feature-tracking-cardiac-magnetic-resonance-comparison-with-two-dimensional-methodology-and-relevance-of-age-and-gender
#12
Boyang Liu, Ahmed M Dardeer, William E Moody, Manvir K Hayer, Shanat Baig, Anna M Price, Francisco Leyva, Nicola C Edwards, Richard P Steeds
Myocardial deformation is a sensitive marker of sub-clinical myocardial dysfunction that carries independent prognostic significance across a broad range of cardiovascular diseases. It is now possible to perform 3D feature tracking of SSFP cines on cardiac magnetic resonance imaging (FT-CMR). This study provides reference ranges for 3D FT-CMR and assesses its reproducibility compared to 2D FT-CMR. One hundred healthy individuals with 10 men and women in each of 5 age deciles from 20 to 70 years, underwent 2D and 3D FT-CMR of left ventricular myocardial strain and strain rate using SSFP cines...
November 27, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29174339/feasibility-of-left-ventricular-global-longitudinal-strain-measurements-from-contrast-enhanced-echocardiographic-images
#13
Diego Medvedofsky, Roberto M Lang, Eric Kruse, Brittney Guile, Lynn Weinert, Boguslawa Ciszek, Zachary Jacobson, Jacqueline Negron, Valentina Volpato, Aldo Prado, Amit R Patel, Victor Mor-Avi
BACKGROUND: Although left ventricular global longitudinal strain (GLS) is an index of systolic function recommended by the guidelines, poor image quality may hamper strain measurements. While contrast agents are commonly used to improve endocardial visualization, no commercial speckle-tracking software is able to measure strain in contrast-enhanced images. This study aimed to test the accuracy of speckle-tracking software when applied to contrast-enhanced images in patients with suboptimal image quality...
November 23, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/29133275/normal-values-for-myocardial-deformation-within-the-right-heart-measured-by-feature-tracking-cardiovascular-magnetic-resonance-imaging
#14
Boyang Liu, Ahmed M Dardeer, William E Moody, Nicola C Edwards, Lucy E Hudsmith, Richard P Steeds
BACKGROUND: Reproducible and repeatable assessment of right heart function is vital for monitoring congenital and acquired heart disease. There is increasing evidence for the additional value of myocardial deformation (strain and strain rate) in determining prognosis. This study aims to determine the reproducibility of deformation analyses in the right heart using cardiovascular magnetic resonance feature tracking (FT-CMR); and to establish normal ranges within an adult population. METHODS: A cohort of 100 healthy subjects containing 10 males and 10 females from each decade of life between the ages of 20 and 70 without known congenital or acquired cardiovascular disease, hypertension, diabetes, dyslipidaemia or renal, hepatic, haematologic and systemic inflammatory disorders underwent FT-CMR assessment of right ventricular (RV) and right atrial (RA) myocardial strain and strain rate...
October 31, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/29121754/the-role-of-feature-tracking-in-cardiovascular-magnetic-resonance-imaging-in-hypertrophic-cardiomyopathy
#15
EDITORIAL
Theodore Murphy, Deirdre Waterhouse
No abstract text is available yet for this article.
December 15, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/29121751/prognostic-implications-of-global-myocardial-mechanics-in-hypertrophic-cardiomyopathy-by-cardiovascular-magnetic-resonance-feature-tracking-relations-to-left-ventricular-hypertrophy-and-fibrosis
#16
Rocio Hinojar, Covadonga Fernández-Golfín, Ariana González-Gómez, Luis Miguel Rincón, Maria Plaza-Martin, Eduardo Casas, Ana García-Martín, Mª Angeles Fernandez-Mendez, Amparo Esteban, Jose Julio Jimenez Nacher, Jose Luis Zamorano
BACKGROUND: Interstitial fibrosis, myocardial fiber disarray and non-uniform shortening are common histological features of hypertrophic cardiomyopathy (HCM). The degree of LV hypertrophy and fibrosis are postulated to contribute to the impairment of myocardial shortening. Cardiovascular magnetic resonance myocardial (CMR) feature tracking (CMR-FT) has emerged as a robust method that provides quantitative measurements of myocardial deformation. Our aim was first to evaluate LV strain parameters in HCM by CMR-FT and their dependence on both functional parameters and late gadolinium enhancement (LGE); and secondly we sought to determine their association with major cardiovascular outcomes...
December 15, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/29105955/right-ventricular-systolic-function-and-mechanical-dispersion-identify-patients-with-arrhythmogenic-right-ventricular-cardiomyopathy
#17
Meriam Åström Aneq, Eva Maret, Lars Brudin, Anneli Svensson, Jan Engvall
PURPOSE: To assess right ventricular (RV) regional and global systolic function using feature tracking (FT) in patients with a definite diagnosis of arrhythmogenic right ventricular cardiomyopathy (ARVC) and to investigate if changes in strain amplitude and mechanical dispersion indicate a propensity for arrhythmia. MATERIALS AND METHODS: Twenty-seven patients fulfilling Task Force Criteria for ARVC and 24 healthy volunteers underwent MR at 1·5 Tesla. Steady-state free precession cine of long-axis slices and a short-axis stack of the RV was acquired...
November 6, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/29064540/myocardial-strain-characteristics-and-outcomes-after-transcatheter-aortic-valve-replacement
#18
Dominik Buckert, Raid Tibi, Maciej Cieslik, Michael Radermacher, Yang-Yang Qu, Volker Rasche, Peter Bernhardt, Vinzenz Hombach, Wolfgang Rottbauer, Jochen Wöhrle
BACKGROUND: Objective of this study was to make an assessment of standard functional and deformation parameters (strain) in patients after transcatheter aortic valve replacement (TAVR) by cardiac magnetic resonance imaging (CMR) and the evaluation of their prognostic impact. METHODS: Patients undergoing TAVR received CMR on a 1.5T whole-body scanner at 3 months after the procedure. Deformation parameters (strain, strain rate, velocity, displacement) were assessed in longitudinal, circumferential and radial orientation using a feature tracking approach...
October 24, 2017: Cardiology Journal
https://www.readbyqxmd.com/read/29047921/game-theory-based-visual-tracking-approach-focusing-on-color-and-texture-features
#19
Zefenfen Jin, Zhiqiang Hou, Wangsheng Yu, Chuanhua Chen, Xin Wang
It is difficult for a single-feature tracking algorithm to achieve strong robustness under a complex environment. To solve this problem, we proposed a multifeature fusion tracking algorithm that is based on game theory. By focusing on color and texture features as two gamers, this algorithm accomplishes tracking by using a mean shift iterative formula to search for the Nash equilibrium of the game. The contribution of different features is always keeping the state of optical balance, so that the algorithm can fully take advantage of feature fusion...
July 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29043465/comparison-of-strain-imaging-techniques-in-crt-candidates-cmr-tagging-cmr-feature-tracking-and-speckle-tracking-echocardiography
#20
Wouter M van Everdingen, Alwin Zweerink, Robin Nijveldt, Odette A E Salden, Mathias Meine, Alexander H Maass, Kevin Vernooy, Frederik J De Lange, Albert C van Rossum, Pierre Croisille, Patrick Clarysse, Bastiaan Geelhoed, Michiel Rienstra, Isabelle C Van Gelder, Marc A Vos, Cornelis P Allaart, Maarten J Cramer
Parameters using myocardial strain analysis may predict response to cardiac resynchronization therapy (CRT). As the agreement between currently available strain imaging modalities is unknown, three different modalities were compared. Twenty-seven CRT-candidates, prospectively included in the MARC study, underwent cardiac magnetic resonance (CMR) imaging and echocardiographic examination. Left ventricular (LV) circumferential strain was analysed with CMR tagging (CMR-TAG), CMR feature tracking (CMR-FT), and speckle tracking echocardiography (STE)...
October 17, 2017: International Journal of Cardiovascular Imaging
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