TY - JOUR. T1 - Evaluation of cardiac dyssynchrony with longitudinal strain analysisin 4-chamber cine MR imaging. AU - Kawakubo, Masateru. AU - Nagao, Michinobu. AU - Kumazawa, Seiji. AU - Chishaki, Akiko S.. AU - Mukai, Yasushi. AU - Nakamura, Yasuhiko. AU - Honda, Hiroshi. AU - Morishita, Junji. PY - 2013/12. Y1 - 2013/12. N2 - Purpose: We investigated the clinical performance of evaluation of cardiac mechanical dyssynchrony withlongitudinal strain analysis using four-chamber (4CH) cine magnetic resonance imaging (MRI).Materials and methods: We retrospectively enrolled 73 chronic heart failure patients (41 men, 32 women;mean age, 57 years, NYHA 2, 3, and 4) who underwent a cardiac MRI in the present study. The left ventricu-lar dyssynchrony (LVD) and interventricular dyssynchrony (IVD) indices were calculated by longitudinalstrain analysis using 4CH cine MRI. The LVD and IVD indices were compared by the Wilcoxon rank-sumtest between the patients with indication for cardiac resynchronization ...
The daily workhorse cine sequence in CMR is balanced steady state free precession (SSFP) which is very sensitive to artefacts from ferromagnetic objects. The severity of artefacts in cine images caused by PHV may range from no artefact to severe artefact obscuring not only the valve but also the adjacent structures. Therefore from a CMR perspective the ferromagnetic metallic component of the PHV is the main factor determining cine image quality. While one may think that mechanical PHV will cause the more severe artefacts and bioprosthetic PHV will be friendlier with the image quality, this is not always the case. The metallic component of a mechanical valve may not be highly ferromagnetic whereas the very small amount of metal used in the supporting stent of a bioprosthetic valve may cause significant image distortion (Figure 2 A, B).. ...
magnetic c resonance imaging 磁共振成象 diffusion magnetic resonance imaging 磁共振成像 ; 扩散磁共振成像 ; 弥散 magnetic resonance spectroscopic imaging 磁共振波谱成像 ; 谱成像 ; 核磁共振波谱成像 ; 也成为磁共振波谱成像 cardiac magnetic resonance imaging 心脏磁共振成像 ; 心脏核磁共振 ; 以心脏核磁共振 magnetic resonance imaging unit 磁共振成象机 ; 释义磁共振成象机 cine magnetic resonance imaging 行磁共振电影成像 ; 磁共振电影成像 ; 共振电影成像 magnetic resonance water imaging 磁共振水成像 perfusion magnetic resonance imaging 磁共振灌注成像 fetal magnetic resonance imaging 胎儿磁共振成像 ...
A 68-year-old woman was admitted complaining of exertional dyspnea. Ten years earlier, a diagnosis of diabetes had been made and hearing loss had developed. Echocardiography and cine magnetic resonance imaging (Movie I, left) showed asymmetric septal hypertrophy with a mildly hypokinetic left ventricle (LV) (ejection fraction =48%); coronary angiography showed no significant stenosis in any major artery. Electron microscopic examination of a LV endomyocardial biopsy specimen revealed mitochondrial enlargement (Figure 1A, arrows) with concentrically arrayed cristae (Figure 1A, arrow head) and crystalline inclusions (Figure 1B, arrow). The patient was diagnosed with mitochondrial disease after a mitochondrial DNA mutation, an A to G transition at nucleotide position 3243 in the tRNALeu gene, was detected in her leukocytes. Treatment with ubiquinone (coenzyme Q10) for the primary disorder and with carvedilol and enalapril for the secondary heart failure was initiated. ...
Coronary flow reserve (CFR) is one traditional method that has been used to assess coronary perfusion. It is calculated as the ratio of maximal blood velocity (during hyperemia) to resting blood velocity for a given coronary artery.. In chronic heart failure, resting coronary blood flow (measured using velocity-encoded cine magnetic resonance imaging) appears to be reduced in primary but not ischemic cardiomyopathy. Coronary flow reserve, however, is compromised irrespective of etiology (15,16). The technique of CFR is somewhat limited in that when abnormal, it is unclear whether the culprit lies in the epicardial arteries, arterioles, or capillaries (as CFR decreases with increased resistance at any level of the coronary circulation). Furthermore, CFR can be altered by changes in baseline or stress-induced flow, which are influenced by loading conditions, hemodynamics, and contractility (17). To overcome this limitation, Gould et al. (18) proposed the concept of relative CFR (rCFR), defined as ...
A 53 year old man was referred for a contrast enhanced cardiovascular magnetic resonance (CMR) scan for assessment of anterior myocardial wall viability. An earlier coronary angiogram had shown a mid left anterior descending artery (LAD) occlusion, and echocardiography had shown mildly reduced global left ventricular function without any other abnormalities. Cine CMR images (steady state free precession sequence) showed a dilated left ventricle (LV) with reduced global systolic function [End-diastolic volume 224 mls (NR 77-195 mls); end-systolic volume 124 mis (NR 19-72 mls); ejection fraction 45%]. There was wall thinning and akinesis of the anteroapical wall and severe hypokinesis of the mid anteroseptal wall. Postgadolinium images (segmented inversion recovery turboFLASH sequence) revealed a prominent LV apical thrombus which measured 1.4 cm at greatest diameter (Figure 1). Using the late gadolinium technique there was extensive (mainly transmural) hyperenhancement (HE) involving the mid and apical
BACKGROUND: Obesity is characterized by impaired cardiac energetics, which may play a role in the development of diastolic dysfunction and inappropriate shortness of breath. We assessed whether, in obesity, derangement of energetics and diastolic function is further altered during acute cardiac stress. METHODS AND RESULTS: Normal-weight (body mass index, 22±2 kg/m(2); n=9-17) and obese (body mass index, 39±7 kg/m(2); n=17-46) subjects underwent assessment of diastolic left ventricular function (cine magnetic resonance imaging volume-time curve analysis) and cardiac energetics (phosphocreatine/ATP ratio; (31)P-magnetic resonance spectroscopy) at rest and during dobutamine stress (heart rate increase, 65±22% and 69±14%, respectively; P=0.61). At rest, obesity was associated with a 22% lower peak filling rate (P|0.001) and a 15% lower phosphocreatine/ATP ratio (1.73±0.40 versus 2.03±0.28; P=0.048). Peak filling rate correlated with fat mass, left ventricular mass, leptin, waist-to-hip ratio, and
Evaluation of myocardial mass, volumes and function is essential in the management of cardiovascular diseases. While 2D and 3D echocardiography play a major role in determining these parameters cardiovascular magnetic resonance (CMR) has become a widely accepted gold standard for these measurements due to its high accuracy and reproducibility.. However, determining normal reference standards for CMR is crucial for proper use of the method. Previous reports have established normal ranges for both fast low angle shot techniques6 and the more commonly used steady state free precession methods including values normalized not only to body surface area but to age and gender as well. Despite these general references, variability in normal ranges have been reported previously when ethnicity is taken into account. The ongoing Multi-Ethnic Study of Atherosclerosis (MESA) trial has measured cardiovascular function in participants with different ethnical backgrounds, reporting differences in the ...
This paper focuses on validating a novel framework for estimating the functional strain from cine cardiac magnetic resonance imaging (CMRI). The framework consists of three processing steps. First, the left ventricle (LV) wall borders are segmented using a level-set based deformable model. Second, the points on the wall borders are tracked during the cardiac cycle based on solving the Laplace equation between the LV edges. Finally, the circumferential and radial strains are estimated at the inner, mid-wall, and outer borders of the LV wall. The proposed framework is validated using synthetic phantoms of the material strains that account for the physiological features and the LV response during the cardiac cycle. Experimental results on simulated phantom images confirm the accuracy and robustness of our method ...
BACKGROUND: Cardiovascular magnetic resonance (CMR) by delayed enhancement (DE) enables visualisation of myocardial scarring, but no dedicated studies are available in thalassaemia major. OBJECTIVE: To investigate the prevalence, extent, clinical and
A four chamber steady state free precession cine image was acquired followed by a breath hold cine gradient echo-planar tagging sequence in the same plane, using a modification of the technique of Kozerke [1] to mark a line across the basal RV and LV myocardium with a labelling pre-pulse (figure 1). Movements of the labelled myocardium were then tracked automatically by multi-resolution image registration [2] and the end points cubic spline interpolated between time points so that the position of the RV free wall, and its displacement, could be derived at any required time-point in the cardiac cycle. ...
Our results confirm the primary hypothesis that OPCABG surgery results in significantly better early postoperative LV function than ONCABG surgery. When imaged a median of 6 days after surgery, there was an absolute difference of 6% in the mean postoperative ejection fraction change between the 2 surgical groups. In contrast, we found no difference in the incidence or severity of new irreversibly injured myocardium between the 2 surgical groups, which averaged 3 g, or 2% of total LV mass. Therefore, OPCABG surgery improves LV function early after surgery but does not seem to reduce the extent of irreversible myocardial injury associated with CABG.. The 2 surgical groups were well matched in terms of preoperative (age, cardiopulmonary risk factors, and preoperative medication use) and perioperative (number of distal anastomoses, types of grafts) factors, and almost all (97%) had exclusive use of arterial conduits. This strongly suggests that results were caused by true differences in surgical ...
Only one cut of a stack of short axis is shown. This method allows quantification of left ventricular (LV) and right ventricular (RV) volumes in diastole and systole and calculation of the LV ejection fraction, stroke volumes, and cardiac output (a product of LV stroke volume and heart rate). Note that in this case there is anterior and anteroseptal akinesia (lack of systolic wall thickening, as shown by the left cine movie, red arrows) matching by a near-transmural myocardial infarction as seen by the matching late gadolinium enhancement (LGE) image (right picture, white arrows).. ...
8 rats had an inflatable balloon coronary occluder surgically inserted via thoracotomy. They were allowed to recover for 10-14 days. MRI was performed to obtain baseline measurement of ventricular function. T1 mapping was performed using the Small-Animal Look-Locker Inversion Recovery (SALLI) technique.. Without removing the animals from the scanner, the left coronary artery was occluded for 30 minutes. Myocardial function and T1 were measured during ischemia.. MRI was performed on a whole-body 3.0-T MR unit with a 70 mm solenoid coil for rats. After generation of survey images and of a long-axis set of cine images, a stack of LV short-axis cine images was acquired to assess global function.. Short axis SALLI MR imaging was performed using the same short axis orientation in the mid ventricle, distal to the occluder. Typical SALLI parameters were as follows: 64 x 64 mm field of view, 0.60 x 0.60 mm pixel size, 3.0 mm-thick sections, 5.2/2.2, 10° flip angle, 4000 ms AD, 4000 ms RD, 12 phases ...
CiteSeerX - Scientific articles matching the query: Estimating 3D Strain from 4D Cine-MRI and Echocardiography: In-Vivo Validation
Steady-state free precession (SSFP) is a highly-efficient MRI pulse sequence that has been a fairly recent arrival in the functional MRI realm. Several methods for using balanced SSFP to detect the BOLD signal have been proposed to date and will be discussed in this review. After a brief introduction to the general properties of SSFP, this review describes the quite different approaches of transition-band and pass-band SSFP in terms of functional contrast mechanism. It then discusses the potential advantages of these techniques, followed by their challenges and shortcomings. Finally, it gives an overview of some applications considered to date and the authors perspective on where these techniques are headed. In the spirit of this special issue, the author also includes some of the personal history underlying her own explorations in this area. © 2011 Elsevier Inc.
To determine the accuracy of visual analysis of left ventricular (LV) function in comparison with the accepted quantitative gold standard method, cardiac magnetic resonance (CMR). Cine CMR imaging was performed at 1.5 T on 44 patients with a range of ejection fractions (EF, 5-80%). Clinicians (n = 18) were asked to visually assess EF after sequentially being shown cine images of a four chamber (horizontal long axis; HLA), two chamber (vertical long axis; VLA) and a short axis stack (SAS) and results were compared to a commercially available analysis package. There were strong correlations between visual and quantitative assessment. However, the EF was underestimated in all categories (by 8.4% for HLA, 8.4% for HLA + VLA and 7.9% for HLA + VLA + SAS, P all | 0.01) and particularly underestimated in mild LV impairment (17.4%, P | 0.01), less so for moderate (4.9%) and not for severe impairment (1%). Assessing more than one view of the heart improved visual assessment of LV, EF, however, clinicians
3D CINE Phase Contrast Magnetic Resonance Imaging (PCMRI) is considered the technique of election to study in vivo the time varying, complex blood flow structures evolving into arteries [1]. PCMRI allows to obtain a quantitative depiction of the spatial distribution of blood velocities from the acquired phase data and the anatomical image of the district of interest from magnitude data. A major limitation in the application of 3D CINE PCMRI to the clinical practice is the long scan time needed to obtain phase datasets (i.e., blood flow velocities) of sufficient quality for hemodynamic visualizations of time evolving fluid structures or for volumetric flow rates retrospective quantification and analysis. Recently, huge efforts have been done to speed up in vivo acquisitions by implementing/optimizing parallel imaging acquisition schemes as the Sensitivity Encoding (SENSE) [2]. However, the increased reduction factors employed in SENSE scheme to speed up the acquisition lead to acquired PCMRI ...
Source: Journal of Cardiovascular Magnetic Resonance - August 16, 2018 Category: Radiology Authors: R. J. Kim, O. P. Simonetti, M. Westwood, C. M. Kramer, A. Narang, M. G. Friedrich, A. J. Powell, J. C. Carr, J. Schulz-Menger, E. Nagel, W. S. Chan, J. Bremerich, K. G. Ordovas, R. C. Rollings, A. R. Patel and V. A. Ferrari Tags: Guidelines Source Type: research. Extracellular volume fraction measurements derived from the longitudinal relaxation of blood-based synthetic hematocrit may lead to clinical errors in 3 T cardiovascular magnetic resonance ...
Cranial nerves are very thin and hard to distinguish on conventional MR images. Hence the development of steady state free precession SSFP which with thin section acquisition provides high contrast resolution between CSF and other structures.
Greenwood JP, Maredia N, Younger JF, Brown JM, Nixon J, Everett CC, Bijsterveld P, Ridgway JP, Radjenovic A, Dickinson CJ, Ball SG, Plein S. Cardiovascular magnetic resonance and single-photon emission computed tomography for diagnosis of coronary heart disease (CE-MARC): a prospective trial. Lancet. 2012;379:453-460. ...
Jahnke, C; Manka, R; Kozerke, S; Schnackenburg, B; Gebker, R; Marx, N; Paetsch, I (2014). Cardiovascular magnetic resonance profiling of coronary atherosclerosis: vessel wall remodelling and related myocardial blood flow alterations. European Heart Journal Cardiovascular Imaging, 15(12):1400-1410. ...
The Section of Cardiovascular Magnetic Resonance Imaging (MRI) is dedicated to providing cutting-edge patient care through state-of-the-art clinical diagnostic imaging, the training of cardiologists, and innovative (and interdisciplinary) research ...
accelerated acceleration acquisitions added affect allowing although analyses appear applied apply artifacts auburn axis balanced bandwidth bending bottom breath calculating calculation capability cardiac cine circumferential classic clear common complex consistent context continuously cost curves customized cycle dense developed diagnostic discrete displacement drawn efficiency efficient effort either enables encode encoding every extra fading fast filtered filtering five flash frames free full function gradients graphs heartbeat hidden highly hold holds human illustrates improved include includes incorporate intensive interleaves just limited long magnetization magnitude matrix model modulated modulation must myocardial need next noisy note onto operator patterns peak performance pixel plus previously process program programs pulse quantification quantifies quantitative ramped readout rectangular remains representative requiring restore returns runs saturation sector sectors segment ...
Learn about a Stress Cardiac MRI, including how to get ready for the test, what is done during the test and how long it will take.
This unit describes how to determine hemodynamic parameters of cardiac function such as ejection fraction (EF), end diastolic volume (EDV), end systolic volume (ESV), stroke volume (SV), and cardiac mass, based on experience using a Siemens 1
Both post-contrast myocardial T1 and extracellular volume (ECV) have been reported to be associated with diffuse interstitial fibrosis. Recently, the cardiovascular magnetic resonance (CMR) field is recognizing that post-contrast myocardial T1 is sen
Recent evidence supports the existence of a trauma induced secondary cardiac injury (TISCI) that is associated with poor clinical outcome [ 1 ].
Irix have announced a new Cine lens, the 45mm T1.5, which will be the third full-frame cine lens suitable for shooting with 8K Ultra HD cameras.
estrenosdecine.eu: Estrenos de cine. Toda la información de las películas y los próximos estrenos de cine del 2015. Avance de los trailers de los últimos estrenos.
Ven a Mall Plaza, Encuentra lo más variado en productos y servicios, los mejores panoramas de entretención y cultura con salas de cine ademas de las Terrazas y Autoplaza.¡Hay vida en tu plaza!
Cine IR captures image contrast evolution at different TI times to quickly determine optimal TI value for myocardial-delayed enhancement (MDE). Learn more.
Cine IR captures image contrast evolution at different TI times to quickly determine optimal TI value for myocardial-delayed enhancement (MDE). Learn more.
www.vepelis.com - Peliculas y estrenos de cine online y series online gratis, documentales online con descargas directas en VePelis
GeoDepth velocity determination and 3D/2D velocity model building system for the creation of accurate seismic imaging in either time or depth.
Paradigm® GeoDepth® velocity determination and 3D/2D velocity model building system for the creation of accurate seismic imaging in either time or depth.
Nu, nu sunt numere câștigătoare la loto, sau cine știe. Dacă le folosiți și luați premiul cel mare aștept o recompensă! Eu vă dau un motiv să bem, de parcă n-am avea suficiente… Ne ajută și calendarul ortodox. Doamnelor, ieri Continue reading 8, 9, 40 și 44→. ...
Nu, nu sunt numere câștigătoare la loto, sau cine știe. Dacă le folosiți și luați premiul cel mare aștept o recompensă! Eu vă dau un motiv să bem, de parcă n-am avea suficiente… Ne ajută și calendarul ortodox. Doamnelor, ieri Continue reading 8, 9, 40 și 44→. ...
To the Editor,. We read with great interest the article by Ismail et al1 looking at the role of late gadolinium enhancement cardiac magnetic resonance (CMR) in the risk stratification of patients with hypertrophic cardiomyopathy (HCM). We would like to congratulate the authors for delineating the interesting findings that the amount of myocardial fibrosis was a strong univariable predictor of sudden cardiac death … ...
PURPOSE: To compare cardiac cine MR imaging using steady state free precession (SSFP) and fast low angle shot (FLASH) techniques at 1.5 and 3 T, and to establish their variabilities and reproducibilities for cardiac volume and mass determination in volunteers. To assess the feasibility of SSFP imaging in patients at 3 T and to determine comparability to volume data acquired at 1.5 T. MATERIALS AND METHODS: Ten healthy volunteers underwent cardiac magnetic resonance imaging using SSFP and segmented gradient-echo FLASH, using both a 1.5 and a 3 T MR system on the same day. Ten patients with impaired left ventricular (LV) function were also studied at both field strengths with SSFP. RESULTS: For both SSFP and FLASH, field strength had no effect on the quantification of LV and right ventricular (RV) volumes, mass, or function (P | or = 0.05 for field strength for all parameters). At both 1.5 and 3 T, SSFP yielded smaller LV mass (e.g., at 3 T 109 +/- 30 g vs. 142 +/- 37 g; P = 0.011) and larger LV volume (e
Latus, Heiner; Gummel, Kerstin; Klingel, Karin; Moysich, Axel; Khalil, Markus; Mazhari, Nona; Bauer, Juergen; Kandolf, Reinhard; Schranz, Dietmar; Apitz, Christian ...
BACKGROUND: Obesity is linked to increased left ventricular mass, an independent predictor of mortality. As a result of this, understanding the determinants of left ventricular mass in the setting of obesity has both therapeutic and prognostic implications. Using cardiovascular magnetic resonance our goal was to elucidate the main predictors of left ventricular mass in severely obese subjects free of additional cardiovascular risk factors. METHODS: 38 obese (BMI 37.8 +/- 6.9 kg/m2) and 16 normal weight controls subjects, (BMI 21.7 +/- 1.8 kg/m2), all without cardiovascular risk factors, underwent cardiovascular magnetic resonance imaging to assess left ventricular mass, left ventricular volumes and visceral fat mass. Left ventricular mass was then compared to serum and anthropometric markers of obesity linked to left ventricular mass, i.e. height, age, blood pressure, total fat mass, visceral fat mass, lean mass, serum leptin and fasting insulin level. RESULTS: As expected, obesity was associated with
Methods and Results-Fifteen lesions were created in the endocardium of 13 pigs. A multicontrast inversion recovery steady state free precession imaging method was used to delineate the acute ablation lesions, exploiting T1-weighted contrast. T2 and Mo* maps were also created from fast spin echo data in a subset of pigs (n=5) to help characterize the change in intrinsic contrast in the lesions. Gross pathology was used as reference for the lesion size comparison, and the lesion structures were confirmed with histological data. In addition, a colorimetric iron assay was used to measure ferric and ferrous iron content in the lesions and the healthy myocardium in a subset of pigs (n=2). The lesion sizes measured in inversion recovery steady state free precession images were highly correlated with the extent of lesion core identified in gross pathology. Magnetic resonance relaxometry showed that the radiofrequency ablation procedure changes the intrinsic T1 value in the lesion core and the intrinsic ...
BACKGROUND: A previous study has shown an increased prevalence of late gadolinium enhancement cardiovascular magnetic resonance (LGE CMR) detected unrecognized myocardial infarction (UMI) with increasing extent and severity of coronary artery disease. However, the coronary artery disease was evaluated on a patient level assuming normal coronary anatomy. Therefore, the aims of the present study were to investigate the prevalence of UMI identified by LGE CMR imaging in patients with stable angina pectoris and no known previous myocardial infarction; and to investigate whether presence of UMI is associated with stenotic lesions in the coronary artery supplying the segment of the myocardium in which the UMI is located, using coronary angiography to determine the individual coronary anatomy in each patient.. METHODS: In this prospective multicenter study, we included patients with stable angina pectoris and without prior myocardial infarction, scheduled for coronary angiography. A LGE CMR examination ...
A survey to collect information on the practice of cardiovascular magnetic resonance in patients with pediatric or congenital heart disease by center/program is now complete! It shows the scope of our work and the heterogeneity of practice throughout the world. It will no doubt help us in service standard setting within our individual centers and extended networks. A document entitled "Guidelines and Protocols for Cardiovascular Magnetic Resonance in Children and Adults with Congenital Heart Disease" is now completed. It is available at: "Journal of Cardiovascular Magnetic Resonance 2013, 15:51 doi:10.1186/1532-429X-15-51". A document entitled "Guidelines and Protocols for Cardiovascular Magnetic Resonance in acquired Pediatric Heart Disease" is in preparation. The working group is writing a document on a "how-to" of pediatric non-congenital heart disease by CMR. It is a companion piece to the article above. It will cover protocols for diseases such as cardiomyopathies, connective tissue ...
Official title:. Sensitivity and predictive value of functional cine magnetic resonance imaging (MRI) detecting intra-abdominal adhesions. Background:. Adhesions are a frequent problem in abdominal surgery. The formation of adhesions is part of a normal wound healing. However in some patients adhesions cause severe complications such as chronic pain, obstruction and strangulation of the bowel. Adhesions can also obstruct access to the peritoneal cavity and complicate reoperations. Accurate imaging of adhesions would be of benefit avoiding adhesion related complications at repeated laparotomy or laparoscopy. At present no validated diagnostic tool mapping adhesions exists.. Purpose:. To define the sensitivity and specificity of functional cineMRI in detecting and mapping adhesions in patients undergoing reoperation.. Design:. Prospective multicenter observational trial. Primary outcome:. Sensitivity and specificity of functional MRI detecting adhesions to the abdominal wall. Secondary ...
BACKGROUND: Patients with treated HIV infection have clear survival benefits although with increased cardiac morbidity and mortality. Mechanisms of heart disease may be partly related to untreated chronic inflammation. Cardiovascular magnetic resonance imaging allows a comprehensive assessment of myocardial structure, function, and tissue characterization. We investigated, using cardiovascular magnetic resonance, subclinical inflammation and myocardial disease in asymptomatic HIV-infected individuals. METHODS AND RESULTS: Myocardial structure and function were assessed using cardiovascular magnetic resonance at 1.5-T in treated HIV-infected individuals without known cardiovascular disease (n=103; mean age, 45±10 years) compared with healthy controls (n=92; mean age, 44±10 years). Assessments included left ventricular volumes, ejection fraction, strain, regional systolic, diastolic function, native T1 mapping, edema, and gadolinium enhancement. Compared with controls, subjects with HIV infection had 6%
Imaging plays a crucial role in the diagnosis, management, and prognosis assessment of patients with nonischemic cardiomyopathies. Over the past decade, the role of cardiovascular magnetic resonance imaging in clinical practice has been rapidly expanding. The techniques unsurpassed accuracy in defining cardiac morphology and function and ability to provide tissue characterization make it particularly well suited for the study of patients with nonischemic cardiomyopathies. In this review article, we provide an overview of the main cardiovascular magnetic resonance features of nonischemic cardiomyopathies, highlighting the diagnostic and prognostic utility of the technique in this heterogenous group of diseases.
BACKGROUND: Individuals with unrecognized myocardial infarctions (UMIs) detected with cardiovascular magnetic resonance (CMR) constitute a recently defined group whose prognosis has not been fully evaluated. However, increasing evidence indicate that these individuals may be at considerable cardiovascular risk. The aim of the present study was to investigate the prognostic impact of CMR detected UMIs for major adverse cardiac events (MACE) in community living elderly individuals.. METHODS: Late gadolinium enhancement CMR was performed in 248 randomly chosen 70-year-olds. Individuals with myocardial infarction (MI) scars, with or without a hospital diagnosis of MI were classified as recognized MI (RMI) or UMI, respectively. Medical records and death certificates were scrutinized. MACE was defined as cardiac death, non-fatal MI, a new diagnosis of angina pectoris, or symptom-driven coronary artery revascularization.. RESULTS: During follow-up (mean 11 years) MACE occurred in 10 % (n = 18/182) of ...
Evaluation of cardiac functions using Strain Encoded (SENC) magnetic resonance (MR) imaging is a powerful tool for imaging the deformation of left and right ventricles. However, automated analysis of SENC images is hindered due to the low signal-to-noise ratio SENC images. In this work, the authors propose a method to segment the left and right ventricles myocardium simultaneously in SENC-MR short-axis images. In addition, myocardium seed points are automatically selected using skeletonisation algorithm and used as hard constraints for the graph-cut optimization algorithm. The method is based on a modified formulation of the graph-cuts energy term. In the new formulation, a signal probabilistic model is used, rather than the image histogram, to capture the characteristics of the blood and tissue signals and include it in the cost function of the graph-cuts algorithm. The method is applied to SENC datasets for 11 human subjects (five normal and six patients with known myocardial wall motion ...