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Rami Homsi, Julian A Luetkens, Dirk Skowasch, Carmen Pizarro, Alois M Sprinkart, Juergen Gieseke, Julia Meyer Zur Heide Gen Meyer-Arend, Hans H Schild, Claas P Naehle
PURPOSE: Using a cardiac magnetic resonance (CMR) approach we investigated left ventricular (LV) myocardial changes associated with pulmonary arterial hypertension (PAH) by strain analysis and mapping techniques. MATERIALS AND METHODS: Seventeen patients with PAH (9 men; mean age, 64.2±13.6 y) and 20 controls (10 men, 63.2±10.5 y) were examined using CMR at 1.5 T. Native LV T1-relaxation times (T1) and extracellular volume fraction (ECV) were assessed using a MOLLI sequence, T2-relaxation times (T2) by means of a gradient spin-echo sequence, and LV longitudinal strain (LVS) and right ventricular (RV) longitudinal strain (RVS) by means of CMR feature tracking...
November 16, 2016: Journal of Thoracic Imaging
Florian Yger, Maxime Berar, Fabien Lotte
Although promising from numerous applications, current Brain-Computer Interfaces (BCIs) still suffer from a number of limitations. In particular, they are sensitive to noise, outliers and the non-stationarity of ElectroEncephaloGraphic (EEG) signals, they require long calibration times and are not reliable. Thus, new approaches and tools, notably at the EEG signal processing and classification level, are necessary to address these limitations. Riemannian approaches, spearheaded by the use of covariance matrices, are such a very promising tool slowly adopted by a growing number of researchers...
November 9, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Pankaj Garg, Ananth Kidambi, Peter P Swoboda, James R J Foley, Tarique A Musa, David P Ripley, Bara Erhayiem, Laura E Dobson, Adam K McDiarmid, Graham J Fent, Philip Haaf, John P Greenwood, Sven Plein
In the setting of acute ST-elevation myocardial infarction (STEMI), it remains unclear which strain parameter most strongly correlates with microvascular obstruction (MVO) or intramyocardial haemorrhage (IMH). We aimed to investigate the association of MVO, IMH and convalescent left ventricular (LV) remodelling with strain parameters measured with cardiovascular magnetic resonance (CMR). Forty-three patients with reperfused STEMI and 10 age and gender matched healthy controls underwent CMR within 3-days and at 3-months following reperfused STEMI...
October 26, 2016: International Journal of Cardiovascular Imaging
Sabha Bhatti, Srikanth Vallurupalli, Stephanie Ambach, Adam Magier, Evan Watts, Vien Truong, Abdul Hakeem, Wojciech Mazur
Cardiac MRI is frequently used in the diagnosis of cardiac amyloidosis. Feature tracking is a novel method of analyzing myocardial strain at the myocardial borders. We investigated myocardial deformation mechanics of both the right and left ventricles in patients with multiple myeloma with suspected cardiac amyloidosis. Comprehensive strain analysis was performed in 43 patients with multiple myeloma and suspected cardiac amyloidosis. MRI strain by feature tracking was measured using 2D cardiac performance analysis MR software (Tomtec, Germany)...
October 14, 2016: International Journal of Cardiovascular Imaging
Johannes T Kowallick, Miguel Silva Vieira, Shelby Kutty, Joachim Lotz, Gerd Hasenfu, Amedeo Chiribiri, Andreas Schuster
OBJECTIVES: Hypertrophic cardiomyopathy (HCM) is associated with left atrial (LA) functional abnormalities. The determinants and the degree of LA dysfunction in the course of HCM are not fully understood. We aimed to characterize LA mechanics in HCM, according to the extent of left ventricular (LV) hypertrophy and fibrosis. METHODS AND RESULTS: Seventy-three HCM patients and 23 age- and sex-matched controls underwent cardiovascular magnetic resonance imaging including late gadolinium enhancement (LGE)...
October 12, 2016: Investigative Radiology
Ruth Vergara, Onica Pinzon, Taysser Sowley D, Cristiane Martin, Joel Moreno-Ríos
No abstract text is available yet for this article.
October 2016: Journal of Thoracic Oncology
Jonathan E N Langton, Hoi-Ieng Lam, Brett R Cowan, Christopher J Occleshaw, Ruvin Gabriel, Boris Lowe, Suzanne Lydiard, Andreas Greiser, Michaela Schmidt, Alistair A Young
Sparsely sampled cardiac cine accelerated acquisitions show promise for faster evaluation of left-ventricular function. Myocardial strain estimation using image feature tracking methods is also becoming widespread. However, it is not known whether highly accelerated acquisitions also provide reliable feature tracking strain estimates. Twenty patients and twenty healthy volunteers were imaged with conventional 14-beat/slice cine acquisition (STD), 4× accelerated 4-beat/slice acquisition with iterative reconstruction (R4), and a 9...
September 13, 2016: International Journal of Cardiovascular Imaging
Guofeng Zhang, Haomin Liu, Zilong Dong, Jiaya Jia, Tien-Tsin Wong, Hujun Bao
Structure-from-motion (SfM) largely relies on the quality of feature tracking. In image sequences, if disjointed tracks caused by objects moving in and out of the view, occasional occlusion, or image noise, are not handled well, the corresponding SfM could be significantly affected. This problem becomes more serious for accurate SfM of large-scale scenes, which typically requires to capture multiple sequences to cover the whole scene. In this paper, we propose an efficient non-consecutive feature tracking (ENFT) framework to match the interrupted tracks distributed in different subsequences or even in different videos...
September 8, 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
Martin V Andersen, Cooper Moore, Kristine Arges, Peter Søgaard, Lasse R Østergaard, Samuel E Schmidt, Joseph Kisslo, Olaf T Von Ramm
The study describes a novel algorithm for deriving myocardial strain from an entire cardiac cycle using high-frame-rate ultrasound images. Validation of the tracking algorithm was conducted in vitro prior to the application to patient images. High-frame-rate ultrasound images were acquired in vivo from 10 patients, and strain curves were derived in six myocardial regions around the left ventricle from the apical four-chamber view. Strain curves derived from high-frame-rate images had a higher frequency content than those derived using conventional methods, reflecting improved temporal sampling...
November 2016: Ultrasound in Medicine & Biology
Changhong Fu, Ran Duan, Dogan Kircali, Erdal Kayacan
In this paper, we present a novel onboard robust visual algorithm for long-term arbitrary 2D and 3D object tracking using a reliable global-local object model for unmanned aerial vehicle (UAV) applications, e.g., autonomous tracking and chasing a moving target. The first main approach in this novel algorithm is the use of a global matching and local tracking approach. In other words, the algorithm initially finds feature correspondences in a way that an improved binary descriptor is developed for global feature matching and an iterative Lucas-Kanade optical flow algorithm is employed for local feature tracking...
2016: Sensors
Gianni Pedrizzetti, Piet Claus, Philip J Kilner, Eike Nagel
Tissue tracking technology of routinely acquired cardiovascular magnetic resonance (CMR) cine acquisitions has increased the apparent ease and availability of non-invasive assessments of myocardial deformation in clinical research and practice. Its widespread availability thanks to the fact that this technology can in principle be applied on images that are part of every CMR or echocardiographic protocol. However, the two modalities are based on very different methods of image acquisition and reconstruction, each with their respective strengths and limitations...
August 26, 2016: Journal of Cardiovascular Magnetic Resonance
Linyuan Jing, Gregory J Wehner, Jonathan D Suever, Richard J Charnigo, Sudad Alhadad, Evan Stearns, Dimitri Mojsejenko, Christopher M Haggerty, Kelsey Hickey, Anne Marie Valente, Tal Geva, Andrew J Powell, Brandon K Fornwalt
BACKGROUND: Patients with repaired tetralogy of Fallot (rTOF) suffer from progressive ventricular dysfunction decades after their surgical repair. We hypothesized that measures of ventricular strain and dyssynchrony would predict deterioration of ventricular function in patients with rTOF. METHODS: A database search identified all patients at a single institution with rTOF who underwent cardiovascular magnetic resonance (CMR) at least twice, >6 months apart, without intervening surgical or catheter procedures...
August 22, 2016: Journal of Cardiovascular Magnetic Resonance
Abdul Qadir Javaid, Hazar Ashouri, Alexis Dorier, Mozziyar Etemadi, J Alex Heller, Shuvo Roy, Omer T Inan
GOAL: Our objective is to provide a framework for extracting signals of interest from the wearable seismocardiogram (SCG) measured during walking at normal (subject's preferred pace) and moderately-fast (1.34 - 1.45 m/s) speeds. METHODS: We demonstrate, using empirical mode decomposition (EMD) and feature tracking algorithms, that the pre-ejection period (PEP) can be accurately estimated from a wearable patch that simultaneously measures electrocardiogram (ECG) and sternal acceleration signals...
August 16, 2016: IEEE Transactions on Bio-medical Engineering
Peter P Swoboda, Bara Erhayiem, Adam K McDiarmid, Rosalind E Lancaster, Gemma K Lyall, Laura E Dobson, David P Ripley, Tarique A Musa, Pankaj Garg, Carrie Ferguson, John P Greenwood, Sven Plein
BACKGROUND: Athletic training leads to remodelling of both left and right ventricles with increased myocardial mass and cavity dilatation. Whether changes in cardiac strain parameters occur in response to training is less well established. In this study we investigated the relationship in trained athletes between cardiovascular magnetic resonance (CMR) derived strain parameters of cardiac function and fitness. METHODS: Thirty five endurance athletes and 35 age and sex matched controls underwent CMR at 3...
2016: Journal of Cardiovascular Magnetic Resonance
Li Tan Yang, Eiji Yamashita, Yasufumi Nagata, Yuichiro Kado, Shigeru Oshima, Yutaka Otsuji, Masaaki Takeuchi
PURPOSE: To study and compare the prognostic value of cardiac magnetic resonance feature tracking (MR-FT) of biventricular strain parameters with a conventional method. MATERIALS AND METHODS: We retrospectively enrolled 364 patients undergoing clinically indicated cardiac MR examinations (1.5 or 3T scanner). Standard steady-state free precession (SSFP) images were used for analysis. Left ventricular (LV) and right ventricular (RV) ejection fraction (EF) were measured using conventional disk-area summation methods...
August 17, 2016: Journal of Magnetic Resonance Imaging: JMRI
Gustavo R D Bernardina, Pietro Cerveri, Ricardo M L Barros, João C B Marins, Amanda P Silvatti
Action sport cameras (ASC) are currently adopted mainly for entertainment purposes but their uninterrupted technical improvements, in correspondence of cost decreases, are going to disclose them for three-dimensional (3D) motion analysis in sport gesture study and athletic performance evaluation quantitatively. Extending this technology to sport analysis however still requires a methodologic step-forward to making ASC a metric system, encompassing ad-hoc camera setup, image processing, feature tracking, calibration and 3D reconstruction...
2016: PloS One
Mohammadali Habibi, Sanaz Samiei, Bharath Ambale Venkatesh, Anders Opdahl, Thomas M Helle-Valle, Mytra Zareian, Andre L C Almeida, Eui-Young Choi, Colin Wu, Alvaro Alonso, Susan R Heckbert, David A Bluemke, João A C Lima
BACKGROUND: Early detection of structural changes in left atrium (LA) before atrial fibrillation (AF) development could be helpful in identification of those at higher risk for AF. Using cardiac magnetic resonance imaging, we examined the association of LA volume and function, and incident AF in a multiethnic population free of clinical cardiovascular diseases. METHODS AND RESULTS: In a case-cohort study embedded in MESA (Multi-Ethnic Study of Atherosclerosis), baseline LA size and function assessed by cardiac magnetic resonance feature-tracking were compared between 197 participants with incident AF and 322 participants randomly selected from the whole MESA cohort...
August 2016: Circulation. Cardiovascular Imaging
Elaine Rutherford, Mohammed A Talle, Kenneth Mangion, Elizabeth Bell, Samuli M Rauhalammi, Giles Roditi, Christie McComb, Aleksandra Radjenovic, Paul Welsh, Rosemary Woodward, Allan D Struthers, Alan G Jardine, Rajan K Patel, Colin Berry, Patrick B Mark
Noninvasive quantification of myocardial fibrosis in end-stage renal disease is challenging. Gadolinium contrast agents previously used for cardiac magnetic resonance imaging (MRI) are contraindicated because of an association with nephrogenic systemic fibrosis. In other populations, increased myocardial native T1 times on cardiac MRI have been shown to be a surrogate marker of myocardial fibrosis. We applied this method to 33 incident hemodialysis patients and 28 age- and sex-matched healthy volunteers who underwent MRI at 3...
October 2016: Kidney International
Mariana M Lamacie, Paaladinesh Thavendiranathan, Kate Hanneman, Andreas Greiser, Marie-Pierre Jolly, Richard Ward, Bernd J Wintersperger
OBJECTIVES: To evaluate deformable registration algorithms (DRA)-based quantification of cine steady-state free-precession (SSFP) for myocardial strain assessment in comparison with feature-tracking (FT) and speckle-tracking echocardiography (STE). METHODS: Data sets of 28 patients/10 volunteers, undergoing same-day 1.5T cardiac MRI and echocardiography were included. LV global longitudinal (GLS), circumferential (GCS) and radial (GRS) peak systolic strain were assessed on cine SSFP data using commercially available FT algorithms and prototype DRA-based algorithms...
August 4, 2016: European Radiology
Shuang Leng, Meng Jiang, Xiao-Dan Zhao, John Carson Allen, Ghassan S Kassab, Rong-Zhen Ouyang, Ju-Le Tan, Ben He, Ru-San Tan, Liang Zhong
Right ventricular (RV) dysfunction is known to be highly correlated with mortality and morbidity; nevertheless, imaging-based assessment of RV anatomy and physiology lags far behind that of the left ventricle. In this study, we advance RV imaging using cardiac magnetic resonance (CMR) to accomplish the following aims: (i) track the motion of six tricuspid annular (TA) sites using a semi-automatic tracking system; (ii) extract clinically important TA measurements-systolic velocity (Sm), early diastolic velocity (Em), late diastolic velocity (Am), and TA plane systolic excursion (TAPSE)-for each TA site and compare these CMR-derived measurements in healthy subjects vs...
December 2016: Annals of Biomedical Engineering
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