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"Feature-tracking"

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https://www.readbyqxmd.com/read/28894923/differences-in-myocardial-strain-between-pectus-excavatum-patients-and-healthy-subjects-assessed-by-cardiac-mri-a-pilot-study
#1
André Lollert, Tilman Emrich, Jakob Eichstädt, Christoph Kampmann, Tariq Abu-Tair, Salmai Turial, Christoph Düber, Karl-Friedrich Kreitner, Gundula Staatz
OBJECTIVES: To evaluate differences in myocardial strain between pectus excavatum (PE) patients and healthy subjects (HS) assessed by cardiac MRI using the feature-tracking algorithm. METHODS: Cardiac MRI was performed in 14 PE patients and 14 HS (9:5 male to female in each group; age 11-30 years) using a 3T scanner. Post-examination analysis included manual biventricular contouring with volumetry and ejection fraction measurement by two independent radiologists...
September 11, 2017: European Radiology
https://www.readbyqxmd.com/read/28875228/myocardial-deformation-assessed-by-longitudinal-strain-chamber-specific-normative-data-for-cmr-feature-tracking-from-the-german-competence-network-for-congenital-heart-defects
#2
Quanliang Shang, Shivani Patel, Michael Steinmetz, Andreas Schuster, David A Danford, Philipp Beerbaum, Samir Sarikouch, Shelby Kutty
PURPOSE: Left ventricular two-dimensional global longitudinal strain (LS) is superior to ejection fraction (EF) as predictor of outcome. We provide reference data for atrial and ventricular global LS during childhood and adolescence by CMR feature tracking (FT). METHODS: We prospectively enrolled 115 healthy subjects (56 male, mean age 12.4 ± 4.1 years) at a single institution. CMR consisted of standard two-dimensional steady-state free-precession acquisitions...
September 5, 2017: European Radiology
https://www.readbyqxmd.com/read/28866441/cardiac-magnetic-resonance-evaluation-of-left-ventricular-myocardial-strain-in-pulmonary-hypertension
#3
Kimberly Kallianos, Gabriel C Brooks, Kanae Mukai, Florent Seguro de Carvalho, Jing Liu, David M Naeger, Teresa De Marco, Karen G Ordovas
RATIONALE AND OBJECTIVES: We investigated the feasibility of detecting left ventricular (LV) cardiac magnetic resonance (CMR) strain abnormalities using feature-tracking in patients with pulmonary hypertension (PH). MATERIALS AND METHODS: CMR was performed in 16 patients with all groups of PH and in 13 controls. Global and regional peak circumferential strains (%) (which have been shown to be robust by CMR), peak diastolic strain rate (%/s), and dyssynchrony index (ms) were quantified with feature-tracking software...
August 30, 2017: Academic Radiology
https://www.readbyqxmd.com/read/28863780/feature-tracking-cmr-reveals-abnormal-strain-in-preclinical-arrhythmogenic-right-ventricular-dysplasia-cardiomyopathy-a-multisoftware-feasibility-and-clinical-implementation-study
#4
Mimount Bourfiss, Davis M Vigneault, Mounes Aliyari Ghasebeh, Brittney Murray, Cynthia A James, Crystal Tichnell, Firdaus A Mohamed Hoesein, Stefan L Zimmerman, Ihab R Kamel, Hugh Calkins, Harikrishna Tandri, Birgitta K Velthuis, David A Bluemke, Anneline S J M Te Riele
BACKGROUND: Regional right ventricular (RV) dysfunction is the hallmark of Arrhythmogenic Right Ventricular Dysplasia/Cardiomyopathy (ARVD/C), but is currently only qualitatively evaluated in the clinical setting. Feature Tracking Cardiovascular Magnetic Resonance (FT-CMR) is a novel quantitative method that uses cine CMR to calculate strain values. However, most prior FT-CMR studies in ARVD/C have focused on global RV strain using different software methods, complicating implementation of FT-CMR in clinical practice...
September 1, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28856524/4d-modelling-for-rapid-assessment-of-biventricular-function-in-congenital-heart-disease
#5
K Gilbert, B Pontre, C J Occleshaw, B R Cowan, A Suinesiaputra, A A Young
Although more patients with congenital heart disease (CHD) are now living longer due to better surgical interventions, they require regular imaging to monitor cardiac performance. There is a need for robust clinical tools which can accurately assess cardiac function of both the left and right ventricles in these patients. We have developed methods to rapidly quantify 4D (3D + time) biventricular function from standard cardiac MRI examinations. A finite element model was interactively customized to patient images using guide-point modelling...
August 30, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28835220/cardiovascular-magnetic-resonance-feature-tracking-in-small-animals-a-preliminary-study-on-reproducibility-and-sample-size-calculation
#6
Tomas Lapinskas, Jana Grune, Seyedeh Mahsa Zamani, Sarah Jeuthe, Daniel Messroghli, Rolf Gebker, Heike Meyborg, Ulrich Kintscher, Remigijus Zaliunas, Burkert Pieske, Philipp Stawowy, Sebastian Kelle
BACKGROUND: Cardiovascular magnetic resonance feature tracking (CMR-FT) is a novel tissue tracking technique developed for noninvasive assessment of myocardial motion and deformation. This preliminary study aimed to evaluate the observer's reproducibility of CMR-FT in a small animal (mouse) model and define sample size calculation for future trials. METHODS: Six C57BL/6 J mice were selected from the ongoing experimental mouse model onsite and underwent CMR with a 3 Tesla small animal MRI scanner...
August 23, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28830199/myocardial-deformation-assessment-using-cardiovascular-magnetic-resonance-feature-tracking-technique
#7
Haifa M Almutairi, Redha Boubertakh, Marc E Miquel, Steffen E Petersen
BACKGROUND: Cardiovascular Magnetic Resonance (CMR) imaging is an important modality that allows the assessment of regional myocardial function by measuring myocardial deformation parameters such as strain and strain rate throughout the cardiac cycle. Feature tracking is a promising quantitative post-processing technique that is increasingly used. It is commonly applied to cine-images, in particular Steady State Free Precession (SSFP), acquired during routine CMR examinations. OBJECTIVE: To review the studies that have used feature tracking techniques in healthy subjects or patients with cardiovascular diseases (CVD)...
August 22, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28813234/cardiac-mr-strain-a-noninvasive-biomarker-of-fibrofatty-remodeling-of-the-left-atrial-myocardium
#8
Adrian T Huber, Jérôme Lamy, Amer Rahhal, Morgane Evin, Fabrice Atassi, Carine Defrance, Guillaume Lebreton, Karine Clément, Myriam Berthet, Richard Isnard, Pascal Leprince, Philippe Cluzel, Stéphane N Hatem, Nadjia Kachenoura, Alban Redheuil
Purpose To determine whether left atrial (LA) strain quantification with cardiac magnetic resonance (MR) imaging feature tracking is associated with the severity of LA fibrofatty myocardial remodeling at histologic analysis. Materials and Methods This prospective case-control study was approved by the institutional review board. LA strain was evaluated with cardiac MR feature tracking between January 2014 and March 2015 in 13 consecutive patients (mean age, 61 years ± 19; nine male) with mitral regurgitation in the 24 hours before mitral valve surgery and 13 age- and sex-matched healthy control subjects...
August 16, 2017: Radiology
https://www.readbyqxmd.com/read/28808772/longitudinal-strain-assessed-by-cardiac-magnetic-resonance-correlates-to-hemodynamic-findings-in-patients-with-severe-aortic-stenosis-and-predicts-positive-remodeling-after-transcatheter-aortic-valve-replacement
#9
Dominik Buckert, Maciej Cieslik, Raid Tibi, Michael Radermacher, Volker Rasche, Peter Bernhardt, Vinzenz Hombach, Wolfgang Rottbauer, Jochen Wöhrle
AIMS: To assess left-ventricular strain parameters before and after transcatheter aortic valve replacement (TAVR) by feature tracking cardiac magnetic resonance imaging (FT CMR) and to correlate the findings to hemodynamic state and left-ventricular remodeling. METHODS AND RESULTS: Patients with symptomatic AS underwent FT CMR before and after TAVR. Patients were carefully evaluated by a comprehensive work-up including CMR, echocardiography and left and right heart catheterization...
August 14, 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/28748092/a-focused-ultrasound-treatment-system-for-moving-targets-part-i-generic-system-design-and-in-silico-first-stage-evaluation
#10
Michael Schwenke, Jan Strehlow, Daniel Demedts, Sabrina Haase, Diego Barrios Romero, Sven Rothlübbers, Caroline von Dresky, Stephan Zidowitz, Joachim Georgii, Senay Mihcin, Mario Bezzi, Christine Tanner, Giora Sat, Yoav Levy, Jürgen Jenne, Matthias Günther, Andreas Melzer, Tobias Preusser
BACKGROUND: Focused ultrasound (FUS) is entering clinical routine as a treatment option. Currently, no clinically available FUS treatment system features automated respiratory motion compensation. The required quality standards make developing such a system challenging. METHODS: A novel FUS treatment system with motion compensation is described, developed with the goal of clinical use. The system comprises a clinically available MR device and FUS transducer system...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/28722247/left-ventricular-function-and-regional-strain-with-subtly-tagged-steady-state-free-precession-feature-tracking
#11
Eric M Schrauben, Brett R Cowan, Andreas Greiser, Alistair A Young
PURPOSE: To provide regional strain and ventricular volume from a single acquisition, using subtly tagged steady-state free precession (SubTag SSFP) feature tracking. MATERIALS AND METHODS: The effects on regional strain of tag strength in gradient recalled echo (GRE) tagging, flip angle in untagged balanced SSFP, and both in SubTag SSFP were examined in the mid left ventricle of 15 healthy volunteers at 3T. Optimal parameters were determined from varying both tag strength and SSFP flip angle using full tag saturation GRE as the reference standard...
July 19, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28712562/abnormal-right-atrial-performance-in-repaired-tetralogy-of-fallot-a-cmr-feature-tracking-analysis
#12
Shelby Kutty, Quanliang Shang, Navya Joseph, Johannes T Kowallick, Andreas Schuster, Michael Steinmetz, David A Danford, Phillip Beerbaum, Samir Sarikouch
BACKGROUND: We hypothesized that right atrial (RA) performance is abnormal in repaired tetralogy of Fallot (TOF). METHODS: TOF patients were prospectively enrolled for cardiovascular magnetic resonance (CMR), echocardiography and exercise stress following a standardized 14-center protocol. Peak RA longitudinal strain (RALS) and right ventricular longitudinal strain (RVLS) were measured using CMR feature tracking (FT) and correlated to RA and RV end diastolic volumes (EDVi) and ejection fraction (EF)...
July 8, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28688952/left-ventricular-mechanics-in-children-with-hypertrophic-cardiomyopathy-cmr-study
#13
Łukasz Mazurkiewicz, Lidia Ziółkowska, Joanna Petryka, Mateusz Śpiewak, Łukasz Małek, Agata Kubik, Magdalena Marczak, Jolanta Misko, Grażyna Brzezińska-Rajszys
OBJECTIVES: To assess the magnitude of myocardial displacement abnormalities and their alterations with the fibrosis, left-ventricular (LV) outflow tract obstruction (LVOTO) and hypertrophy in juveniles with hypertrophic cardiomyopathy (HCM). STUDY DESIGN: Fifty-five children [age 12,5±4.6years, 38 (69,1%) males, 19 (34,5%) with LVOTO] with HCM and 20 controls underwent cardiovascular magnetic resonance. The LV feature tracking (FT) derived strain and strain rates were quantified...
July 5, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28685315/clinical-feasibility-and-validation-of-3d-principal-strain-analysis-from-cine-mri-comparison-to-2d-strain-by-mri-and-3d-speckle-tracking-echocardiography
#14
Alessandro Satriano, Bobak Heydari, Mariam Narous, Derek V Exner, Yoko Mikami, Monica M Attwood, John V Tyberg, Carmen P Lydell, Andrew G Howarth, Nowell M Fine, James A White
Two-dimensional (2D) strain analysis is constrained by geometry-dependent reference directions of deformation (i.e. radial, circumferential, and longitudinal) following the assumption of cylindrical chamber architecture. Three-dimensional (3D) principal strain analysis may overcome such limitations by referencing intrinsic (i.e. principal) directions of deformation. This study aimed to demonstrate clinical feasibility of 3D principal strain analysis from routine 2D cine MRI with validation to strain from 2D tagged cine analysis and 3D speckle tracking echocardiography...
July 6, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28670388/left-ventricular-myocardial-strain-in-ventricular-arrhythmia-without-structural-heart-disease-using-cardiac-magnetic-resonance
#15
Xuepei Tang, Sisi Yu, Yaohan Yu, Haibo Ren, Shuhao Li, Li Zhou, Zhen Yang, Hailong Wu, Wei Zhou, Lianggeng Gong
Ventricular arrhythmia (VA) in structurally normal heart is considered as benign. However, these arrhythmias have been recently reported to induce left ventricular (LV) dysfunction. Up to now, there is no efficacious method to detect abnormal myocardial systolic function in VA patients. Therefore, in the current study, we used cardiac magnetic resonance feature tracking (CMR-FT) on balanced steady state free precision (SSFP) cine images to investigate LV myocardial strain in 42 VA patients without known heart disease as well as in 29 normal volunteers...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28665235/facial-feature-tracking-a-psychophysiological-measure-to-assess-exercise-intensity
#16
Kathleen H Miles, Bradley Clark, Julien D Périard, Roland Goecke, Kevin G Thompson
The primary aim of this study was to determine whether facial feature tracking reliably measures changes in facial movement across varying exercise intensities. Fifteen cyclists completed three, incremental intensity, cycling trials to exhaustion while their faces were recorded with video cameras. Facial feature tracking was found to be a moderately reliable measure of facial movement during incremental intensity cycling (intra-class correlation coefficient = 0.65-0.68). Facial movement (whole face (WF), upper face (UF), lower face (LF) and head movement (HM)) increased with exercise intensity, from lactate threshold one (LT1) until attainment of maximal aerobic power (MAP) (WF 3464 ± 3364mm, P < 0...
June 30, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28648394/prevalence-correlates-and-prognostic-relevance-of-myocardial-mechanical-dispersion-as-assessed-by-feature-tracking-cardiac-magnetic-resonance-after-a-first-st-segment-elevation-myocardial-infarction
#17
Daniele Muser, Chiara Tioni, Ranjit Shah, Joseph B Selvanayagam, Gaetano Nucifora
Postinfarction mechanical dispersion (MD), that is, the regional heterogeneity of myocardial contraction throughout the cardiac cycle, has detrimental effects on left ventricular (LV) function and is related to the occurrence of heart failure and ventricular arrhythmias. However, its prevalence, pathophysiological determinants, and clinical utility are still unknown. The aim of the present study is to clarify these issues. In total, 130 consecutive patients (mean age 60 ± 12 years, 75% male) with a first ST-segment elevation myocardial infarction (STEMI) were included...
August 15, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28642994/cardiovascular-magnetic-resonance-imaging-to-assess-myocardial-fibrosis-in-valvular-heart-disease
#18
Tomaz Podlesnikar, Victoria Delgado, Jeroen J Bax
The left ventricular (LV) remodeling process associated with significant valvular heart disease (VHD) is characterized by an increase of myocardial interstitial space with deposition of collagen and loss of myofibers. These changes occur before LV systolic function deteriorates or the patient develops symptoms. Cardiovascular magnetic resonance (CMR) permits assessment of reactive fibrosis, with the use of T1 mapping techniques, and replacement fibrosis, with the use of late gadolinium contrast enhancement...
June 22, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28630445/myocardial-deformation-in-cardiac-amyloid-light-chain-amyloidosis-assessed-with-3t-cardiovascular-magnetic-resonance-feature-tracking
#19
Rui Li, Zhi-Gang Yang, Hua-Yan Xu, Ke Shi, Xi Liu, Kai-Yue Diao, Ying-Kun Guo
Clinically, assessment of myocardial function is essential in patients with amyloid light-chain cardiac amyloidosis (AL-CA) to predict outcome and determine therapeutic approach. The aim of this study was to investigate the feasibility of cardiovascular magnetic resonance (CMR)-derived feature tracking algorithm for assessing left ventricular (LV) myocardial deformation in AL-CA, and to determine if these abnormal myocardial deformation parameters are correlated to impaired LV myocardial microvascular dysfunction...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28629574/biventricular-mechanics-in-prediction-of-severe-myocardial-fibrosis-in-patients-with-dilated-cardiomyopathy-cmr-study
#20
Łukasz Mazurkiewicz, Joanna Petryka, Mateusz Spiewak, Barbara Miłosz-Wieczorek, Konrad Werys, Łukasz A Małek, Magdalena Polanska-Skrzypczyk, Natalia Ojrzynska, Agata Kubik, Magdalena Marczak, Jolanta Misko, Jacek Grzybowski
PURPOSE: The purpose of this study was to compare the ability of various parameters of myocardial mechanics to predict large amounts of biventricular fibrosis assessed via T1 mapping in patients with dilated cardiomyopathy (DCM). MATERIAL: Cardiovascular magnetic resonance feature tracking analysis and T1 mapping were performed in 26 patients with DCM [mean age: 34.4±9.1years, 15 (57.6%) males]. The values of various parameters of myocardial mechanics at predicting advanced left-ventricle (LV) and right-ventricle (RV) fibrosis were compared using logistic regression analysis and receiver operating characteristic curve (ROC) analysis...
June 2017: European Journal of Radiology
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