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"Feature-tracking"

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https://www.readbyqxmd.com/read/28537770/automated-description-of-regional-left-ventricular-motion-in-patients-with-cardiac-amyloidosis-a-quantitative-study-using-heart-deformation-analysis
#1
Leng Meng, Kai Lin, Jeremy Collins, Michael Markl, James C Carr
OBJECTIVE: The purpose of this article is to test the hypothesis that heart deformation analysis can automatically quantify regional myocardial motion patterns in patients with cardiac amyloidosis. SUBJECTS AND METHODS: Eleven patients with cardiac amyloidosis and 11 healthy control subjects were recruited to undergo cardiac MRI. Cine images were analyzed using heart deformation analysis and feature tracking. Heart deformation analysis-derived myocardial motion indexes in radial and circumferential directions, including radial and circumferential displacement, radial and circumferential velocity, radial and circumferential strain, and radial and circumferential strain rate, were compared between the two groups...
May 24, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28528164/mri-derived-myocardial-strain-measures-in-normal-subjects
#2
Ha Q Vo, Thomas H Marwick, Kazuaki Negishi
OBJECTIVES: The aim of this study was to perform a systematic review and meta-analysis to estimate the normal ranges of magnetic resonance imaging (MRI)-based feature tracking (FT) and to identify sources of variations. Similar analyses were also performed for strain encoding, displacement encoding with stimulated echoes, and myocardial tagging. BACKGROUND: MRI-FT is a novel technique for quantification of myocardial deformation using MRI cine images. However, the reported 95% confidence intervals (CIs) from the 2 largest studies have no overlaps...
May 11, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28528158/feature-tracking-by-cmr-a-double-feature
#3
EDITORIAL
Michael Salerno
No abstract text is available yet for this article.
May 11, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28515849/feature-tracking-cardiac-magnetic-resonance-imaging-a-review-of-a-novel-non-invasive-cardiac-imaging-technique
#4
REVIEW
Zia Ur Rahman, Pooja Sethi, Ghulam Murtaza, Hafeez Ul Hassan Virk, Aitzaz Rai, Masliza Mahmod, Jeffrey Schoondyke, Kais Albalbissi
Cardiovascular disease is a leading cause of morbidity and mortality globally. Early diagnostic markers are gaining popularity for better patient care disease outcomes. There is an increasing interest in noninvasive cardiac imaging biomarkers to diagnose subclinical cardiac disease. Feature tracking cardiac magnetic resonance imaging is a novel post-processing technique that is increasingly being employed to assess global and regional myocardial function. This technique has numerous applications in structural and functional diagnostics...
April 26, 2017: World Journal of Cardiology
https://www.readbyqxmd.com/read/28500369/feature-tracking-myocardial-strain-analysis-in-acute-myocarditis-diagnostic-value-and-association-with-myocardial-oedema
#5
Julian A Luetkens, Ulrike Schlesinger-Irsch, Daniel L Kuetting, Darius Dabir, Rami Homsi, Jonas Doerner, Frederic C Schmeel, Rolf Fimmers, Alois M Sprinkart, Claas P Naehle, Hans H Schild, Daniel Thomas
OBJECTIVES: To investigate the diagnostic value of cardiac magnetic resonance (CMR) feature-tracking (FT) myocardial strain analysis in patients with suspected acute myocarditis and its association with myocardial oedema. METHODS: Forty-eight patients with suspected acute myocarditis and 35 control subjects underwent CMR. FT CMR analysis of systolic longitudinal (LS), circumferential (CS) and radial strain (RS) was performed. Additionally, the protocol allowed for the assessment of T1 and T2 relaxation times...
May 12, 2017: European Radiology
https://www.readbyqxmd.com/read/28461021/pediatric-fontan-patients-are-at-risk-for-myocardial-fibrotic-remodeling-and-dysfunction
#6
Atsuko Kato, Eugénie Riesenkampff, Deane Yim, Shi-Joon Yoo, Mike Seed, Lars Grosse-Wortmann
BACKGROUND: Patients with single ventricle (SV) circulations are at risk for ventricular dysfunction. This study investigates whether there is evidence of increased myocardial fibrosis and myocardial dysfunction in children after the Fontan operation. METHODS: Consecutive children after the Fontan operation who underwent cardiac magnetic resonance (CMR) T1 relaxometry with a modified look-locker inversion recovery approach were included in this retrospective study...
April 22, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28459687/codingflow-enable-video-coding-for-video-stabilization
#7
Shuaicheng Liu, Mingyu Li, Shuyuan Zhu, Bing Zeng
Video coding focuses on reducing data size of videos. Video stabilization targets at removing shaky camera motions. In this work, we enable video coding for video stabilization by constructing the camera motions based on the motion vectors employed in the video coding. The existing stabilization methods rely heavily on image features for the recovery of camera motions. However, feature tracking is time-consuming and prone to errors. On the other hand, nearly all captured videos have been compressed before any further processing and such a compression has produced a rich set of block-based motion vectors that can be utilized for estimating the camera motion...
April 24, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28421305/the-utility-of-global-longitudinal-strain-in-the-identification-of-prior-myocardial-infarction-in-patients-with-preserved-left-ventricular-ejection-fraction
#8
Graham J Fent, Pankaj Garg, James R J Foley, Laura E Dobson, Tarique A Musa, Bara Erhayiem, John P Greenwood, Sven Plein, Peter P Swoboda
Prior myocardial infarction (MI) is associated with increased mortality and is prevalent in certain high risk patient groups. Electrocardiogram may be used in diagnosis, however, sensitivity is limited, thus non-invasive imaging techniques may improve diagnosis. We investigated whether global longitudinal strain (GLS) and longitudinal strain parameters are reduced in patients with prior MI but preserved left ventricular ejection fraction (LVEF). The study included 40 clinical patients with prior MI occurring >3 months previously (defined as subendocardial hyperenhancement on late Gadolinium enhancement imaging) with LVEF ≥ 55% and 40 controls matched for age and LVEF...
April 18, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28419023/interrelations-of-epicardial-fat-volume-left-ventricular-t1-relaxation-times-and-myocardial-strain-in-hypertensive-patients-a-cardiac-magnetic-resonance-study
#9
Rami Homsi, Daniel Kuetting, Alois Sprinkart, Nina Steinfeld, Michael Meier-Schroers, Julian Luetkens, Jennifer Nadal, Darius Dabir, Stefan Fischer, Juergen Gieseke, Hans Schild, Daniel Thomas
PURPOSE: This cardiac magnetic resonance study was performed to assess myocardial fibrosis by evaluating T1-relaxation time (T1), to measure left ventricular (LV) strain, and to determine epicardial fat volume (EFV) in hypertensive patients with no history of cardiovascular (CV) events and to relate the results to the presence of coronary atherosclerotic artery disease (CAD) in these patients. MATERIALS AND METHODS: A total of 123 subjects were examined at 1.5 T...
May 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28371774/a-novel-method-of-cone-beam-ct-projection-binning-based-on-image-registration
#10
Seonyeong Park, Siyong Kim, Byongyong Yi, Geoffrey Hugo, H Michael Gach, Yuichi Motai
Accurate sorting of beam projections is important in four-dimensional Cone Beam Computed Tomography (4D CBCT) to improve the quality of the reconstructed 4D CBCT image by removing motion-induced artifacts. We propose Image Registration-based Projection Binning (IRPB), a novel marker-less binning method for 4D CBCT projections, which combines Intensity-based Feature Point Detection (IFPD) and Trajectory Tracking using Random sample consensus (TTR). IRPB extracts breathing motion and phases by analyzing tissue feature point trajectories...
March 31, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28360259/influence-of-left-atrial-function-on-exercise-capacity-and-left-ventricular-function-in-patients-with-heart-failure-and-preserved-ejection-fraction
#11
Maximilian von Roeder, Karl-Philipp Rommel, Johannes Tammo Kowallick, Stephan Blazek, Christian Besler, Karl Fengler, Joachim Lotz, Gerd Hasenfuß, Christian Lücke, Matthias Gutberlet, Gerhard Schuler, Andreas Schuster, Philipp Lurz
BACKGROUND: Although left atrial (LA) dysfunction is common in heart failure with preserved ejection fraction (HFpEF), its functional implications beyond the reflection of left ventricular (LV) pathology are not well understood. The aim of this study was to further characterize LA function in HFpEF patients. METHODS AND RESULTS: We performed cardiac magnetic resonance myocardial feature tracking in 22 patients with HFpEF and 12 patients without HFpEF. LA reservoir strain, LA conduit strain, and LA booster pump strain were quantified...
April 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28349989/distribution-pattern-of-left-ventricular-myocardial-strain-analyzed-by-a-cine-mri-based-deformation-registration-algorithm-in-healthy-chinese-volunteers
#12
Hong Liu, Dan Yang, Ke Wan, Yong Luo, Jia-Yu Sun, Tian-Jing Zhang, Wei-Hao Li, Andreas Greiser, Marie-Pierre Jolly, Qing Zhang, Yu-Cheng Chen
The cine magnetic resonance imaging based technique feature tracking-cardiac magnetic resonance (FT-CMR) is emerging as a novel, simple and robust method to evaluate myocardial strain. We investigated the distribution characteristics of left-ventricular myocardial strain using a novel cine MRI based deformation registration algorithm (DRA) in a cohort of healthy Chinese subjects. A total of 130 healthy Chinese subjects were enrolled. Three components of orthogonal strain (radial, circumferential, longitudinal) of the left ventricle were analyzed using DRA on steady-state free precession cine sequence images...
March 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28335982/comparison-of-displacement-encoding-with-stimulated-echoes-to-magnetic-resonance-feature-tracking-for-the-assessment-of-myocardial-strain-in-patients-with-acute-myocardial-infarction
#13
Yoshitaka Goto, Masaki Ishida, Shinichi Takase, Andreas Sigfridsson, Mio Uno, Motonori Nagata, Yasutaka Ichikawa, Kakuya Kitagawa, Hajime Sakuma
The aim of this study was to compare myocardial strain by cardiovascular magnetic resonance feature tracking (CMR-FT) to those derived from displacement encoding with stimulated echoes (DENSE) in patients with acute myocardial infarction (AMI). Twenty patients (65 pa13 years) with AMI underwent cine, DENSE, black-blood T2-weighted and late gadolinium enhancement CMR at 1.5 T. Global and segmental strain was determined by CMR-FT analysis and DENSE on matched 3 short-axis planes. Global circumferential strain by CMR-FT showed a good agreement with that by DENSE (r = 0...
February 28, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28283244/left-atrial-mechanics-in-patients-with-acute-stemi-and-secondary-mitral-regurgitation-a-prospective-pilot-cmr-feature-tracking-study
#14
Tomas Lapinskas, Paulius Bučius, Laura Urbonaitė, Agnieta Stabinskaitė, Živilė Valuckienė, Lina Jankauskaitė, Rimantas Benetis, Remigijus Žaliūnas
BACKGROUND AND OBJECTIVE: Left atrium (LA) is an important biomarker of adverse cardiovascular outcomes and cerebrovascular events. This study aimed to evaluate LA myocardial deformation using cardiac magnetic resonance feature tracking (CMR-FT) in patients with acute ST-segment elevation myocardial infarction (STEMI) and secondary mitral regurgitation (MR). Additionally, to assess interobserver and intraobserver variability of the technique. MATERIALS AND METHODS: Twenty patients with STEMI underwent CMR with a 1...
March 1, 2017: Medicina
https://www.readbyqxmd.com/read/28275558/myocardial-strain-and-symptom-severity-in-severe-aortic-stenosis-insights-from-cardiovascular-magnetic-resonance
#15
Tarique Al Musa, Akhlaque Uddin, Peter P Swoboda, Pankaj Garg, Timothy A Fairbairn, Laura E Dobson, Christopher D Steadman, Anvesha Singh, Bara Erhayiem, Sven Plein, Gerald P McCann, John P Greenwood
BACKGROUND: Symptomatic severe aortic stenosis (AS) is a class I indication for replacement in patients when left ventricular ejection fraction (LVEF) is preserved. However, symptom reporting is often equivocal and decision making can be challenging. We aimed to quantify myocardial deformation using cardiovascular magnetic resonance (CMR) in patients classified by symptom severity. METHODS: Forty-two patients with severe AS referred to heart valve clinic were studied using tagged CMR imaging...
February 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28267556/intra-and-inter-observer-reproducibility-of-global-and-regional-magnetic-resonance-feature-tracking-derived-strain-parameters-of-the-left-and-right-ventricle
#16
Björn Schmidt, Anastasia Dick, Melanie Treutlein, Petra Schiller, Alexander C Bunck, David Maintz, Bettina Baeßler
OBJECTIVES: To investigate the reproducibility of regional and global strain and strain rate (SR) parameters of both ventricles and to determine sample sizes for all investigated strain and SR parameters in order to generate a practical reference for future studies. MATERIALS AND METHODS: The study population consisted of 20 healthy individuals and 20 patients with acute myocarditis. Cine sequences in three horizontal long axis views and a stack of short axis views covering the entire left and right ventricle (LV, RV) were retrospectively analysed using a dedicated feature tracking (FT) software algorithm (TOMTEC)...
April 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28267553/left-and-right-atrial-feature-tracking-in-acute-myocarditis-a-feasibility-study
#17
Anastasia Dick, Björn Schmidt, Guido Michels, Alexander C Bunck, David Maintz, Bettina Baeßler
PURPOSE: The present study aims at evaluating the feasibility and reproducibility of cardiac magnetic resonance (CMR) feature tracking (FT) derived strain and strain rate (SR) parameters of the left and right atrium (LA, RA) in patients with acute myocarditis as well as their potential to detect diastolic dysfunction. In addition, the diagnostic value of LA and RA strain parameters in the setting of acute myocarditis is investigated. METHODS: CMR cine data of 30 patients with CMR-positive acute myocarditis were retrospectively analyzed...
April 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28263147/the-improvement-of-torsion-assessed-by-cardiovascular-magnetic-resonance-feature-tracking-after-coronary-artery-bypass-grafting-a-sensitive-index-of-cardiac-function
#18
Nan Cheng, Liuquan Cheng, Rong Wang, Lin Zhang, Changqing Gao
OBJECTIVE: The aim of this study was to quantify left ventricular torsion by newly applied cardiovascular magnetic resonance feature tracking (CMR-FT), and to evaluate the clinical value of the ventricular torsion as a sensitive indicator of cardiac function by comparison of preoperative and postoperative torsion. METHODS: A total of 54 volunteers and 36 patients with previous myocardial infarction (MI) and LV ejection fraction (EF) between 30%-50% were screened preoperatively or postoperatively by MRI...
February 28, 2017: Heart Surgery Forum
https://www.readbyqxmd.com/read/28222749/the-impact-of-trans-catheter-aortic-valve-replacement-induced-left-bundle-branch-block-on-cardiac-reverse-remodeling
#19
Laura E Dobson, Tarique A Musa, Akhlaque Uddin, Timothy A Fairbairn, Owen J Bebb, Peter P Swoboda, Philip Haaf, James Foley, Pankaj Garg, Graham J Fent, Christopher J Malkin, Daniel J Blackman, Sven Plein, John P Greenwood
BACKGROUND: Left bundle branch block (LBBB) is common following trans-catheter aortic valve replacement (TAVR) and has been linked to increased mortality, although whether this is related to less favourable cardiac reverse remodeling is unclear. The aim of the study was to investigate the impact of TAVR induced LBBB on cardiac reverse remodeling. METHODS: 48 patients undergoing TAVR for severe aortic stenosis were evaluated. 24 patients with new LBBB (LBBB-T) following TAVR were matched with 24 patients with a narrow post-procedure QRS (nQRS)...
February 22, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28215181/effect-of-cellular-and-extracellular-pathology-assessed-by-t1-mapping-on-regional-contractile-function-in-hypertrophic-cardiomyopathy
#20
Peter P Swoboda, Adam K McDiarmid, Bara Erhayiem, Graham R Law, Pankaj Garg, David A Broadbent, David P Ripley, Tarique A Musa, Laura E Dobson, James R Foley, Graham J Fent, Stephen P Page, John P Greenwood, Sven Plein
BACKGROUND: Regional contractile dysfunction is a frequent finding in hypertrophic cardiomyopathy (HCM). We aimed to investigate the contribution of different tissue characteristics in HCM to regional contractile dysfunction. METHODS: We prospectively recruited 50 patients with HCM who underwent cardiovascular magnetic resonance (CMR) studies at 3.0 T including cine imaging, T1 mapping and late gadolinium enhancement (LGE) imaging. For each segment of the American Heart Association model segment thickness, native T1, extracellular volume (ECV), presence of LGE and regional strain (by feature tracking and tissue tagging) were assessed...
February 20, 2017: Journal of Cardiovascular Magnetic Resonance
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