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Cardiac magnetic resonance imaging

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https://www.readbyqxmd.com/read/28818863/detection-of-left-ventricular-thrombus-by-cardiac-magnetic-resonance-in-embolic-stroke-of-undetermined-source
#1
Junji Takasugi, Hiroshi Yamagami, Teruo Noguchi, Yoshiaki Morita, Tomotaka Tanaka, Yoshinori Okuno, Satoshi Yasuda, Kazunori Toyoda, Yasufumi Gon, Kenichi Todo, Manabu Sakaguchi, Kazuyuki Nagatsuka
BACKGROUND AND PURPOSE: We aimed to use contrast-enhanced cardiac magnetic resonance (CE-CMR) imaging to elucidate the prevalence of left ventricular (LV) thrombus in patients suspected of embolic stroke of undetermined source (ESUS) with previous myocardial infarction or LV dysfunction (LV ejection fraction [LVEF] <50%). METHODS: We prospectively investigated 797 consecutive patients who presented to our hospital with acute ischemic stroke between 2014 and 2015...
August 17, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28818577/applications-of-cardiac-magnetic-resonance-imaging-in-sickle-cell-disease
#2
Omar Niss, Michael D Taylor
Cardiac magnetic resonance imaging (CMR) has evolved from an effective research tool to a non-invasive clinical modality with versatile applications. The accuracy of volume measurements and functional assessment and the ability to identify unique myocardial tissue characteristics non-invasively are the primary advantages of CMR. The use of CMR in sickle cell disease (SCD) has been limited clinically to myocardial iron assessment. The use of other CMR applications to characterize the cardiac pathology in SCD is slowly emerging but remains limited to research level...
August 8, 2017: Blood Cells, Molecules & Diseases
https://www.readbyqxmd.com/read/28817780/us-internists-awareness-and-use-of-overtreatment-guidelines-a-national-survey
#3
Kira L Ryskina, Eric S Holmboe, Elizabeth Bernabeo, Rachel M Werner, Judy A Shea, Judith A Long
OBJECTIVES: To assess physician views and perceived adoption of overtreatment guidelines and measure whether adoption of these guidelines influenced the recommendation of a targeted service. STUDY DESIGN: A cross-sectional survey mailed from July 2014 to January 2015 to 902 internists who completed residency between 2003 and 2013, randomly selected from the American Medical Association Masterfile. METHODS: Poisson regression was used to model the rate of recommending a targeted service included in the guidelines, based on the level of guideline adoption...
July 2017: American Journal of Managed Care
https://www.readbyqxmd.com/read/28817662/single-scan-rest-stress-imaging-with-99mtc-sestamibi-and-cadmium-zinc-telluride-based-spect-for-hyperemic-flow-quantification-a-feasibility-study-evaluated-with-cardiac-magnetic-resonance-imaging
#4
Yu-Hua Dean Fang, Yuan-Chang Liu, Kung-Chu Ho, Feng-Cheng Kuo, Ching-Fang Yang, Tzu-Chen Yen, I-Chang Hsieh
INTRODUCTION: We aimed to evaluate whether the hyperemic myocardial blood flow (MBF) can be estimated using cadmium zinc telluride (CZT)-based single-photon emission computed tomography (SPECT) cameras with a single, rapid rest/stress dynamic scan. Dynamic contrast-enhanced (DCE) cardiac magnetic resonance imaging (MRI) was used as a reference modality for flow measurement. MATERIALS AND METHODS: The proposed protocol included both the rest and stress acquisitions within a 24-min scan...
2017: PloS One
https://www.readbyqxmd.com/read/28814965/convolutional-neural-network-for-the-detection-of-end-diastole-and-end-systole-frames-in-free-breathing-cardiac-magnetic-resonance-imaging
#5
Fan Yang, Yan He, Mubashir Hussain, Hong Xie, Pinggui Lei
Free-breathing cardiac magnetic resonance (CMR) imaging has short examination time with high reproducibility. Detection of the end-diastole and the end-systole frames of the free-breathing cardiac magnetic resonance, supplemented by visual identification, is time consuming and laborious. We propose a novel method for automatic identification of both the end-diastole and the end-systole frames, in the free-breathing CMR imaging. The proposed technique utilizes the convolutional neural network to locate the left ventricle and to obtain the end-diastole and the end-systole frames from the respiratory motion signal...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28813234/cardiac-mr-strain-a-noninvasive-biomarker-of-fibrofatty-remodeling-of-the-left-atrial-myocardium
#6
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
#7
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/28806996/improved-passive-catheter-tracking-with-positive-contrast-for-cmr-guided-cardiac-catheterization-using-partial-saturation-psat
#8
Mari Nieves Velasco Forte, Kuberan Pushparajah, Tobias Schaeffter, Israel Valverde Perez, Kawal Rhode, Bram Ruijsink, Mazen Alhrishy, Nicholas Byrne, Amedeo Chiribiri, Tevfik Ismail, Tarique Hussain, Reza Razavi, Sébastien Roujol
BACKGROUND: Cardiac catheterization is a common procedure in patients with congenital heart disease (CHD). Although cardiovascular magnetic resonance imaging (CMR) represents a promising alternative approach to fluoroscopy guidance, simultaneous high contrast visualization of catheter, soft tissue and the blood pool remains challenging. In this study, a novel passive tracking technique is proposed for enhanced positive contrast visualization of gadolinium-filled balloon catheters using partial saturation (pSAT) magnetization preparation...
August 15, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28806577/prevalence-and-predictors-of-cardiac-and-liver-iron-overload-in-patients-with-thalassemia-a-multicenter-study-based-on-real-world-data
#9
Rungroj Krittayaphong, Vip Viprakasit, Pairash Saiviroonporn, Noppadol Siritanaratkul, Suvipaporn Siripornpitak, Arunotai Meekaewkunchorn, Thawatchai Kirawittaya, Pornpun Sripornsawan, Arunee Jetsrisuparb, Jiraporn Srinakarin, Peerapon Wong, Nuttaporntira Phalakornkul, Phakatip Sinlapamongkolkul, John Wood
Prevalence of cardiac and liver iron overload in patients with thalassemia in real-world practice may vary among different regions especially in the era of widely-used iron chelation therapy. The aim of this study was to determine the prevalence of cardiac and liver iron overload in and the management patterns of patients with thalassemia in real-world practice in Thailand. We established a multicenter registry for patients with thalassemia who underwent magnetic resonance imaging (MRI) as part of their clinical evaluation...
August 5, 2017: Blood Cells, Molecules & Diseases
https://www.readbyqxmd.com/read/28803684/role-of-two-dimensional-speckle-tracking-echocardiography-strain-in-the-assessment-of%C3%A2-right-ventricular-systolic-function-and-comparison-with-conventional-parameters
#10
REVIEW
Luca Longobardo, Valentin Suma, Renuka Jain, Scipione Carerj, Concetta Zito, Dianne L Zwicke, Bijoy K Khandheria
Despite the already well-known role the right side of the heart plays in many diseases, right ventricular (RV) function has only recently been carefully considered. Echocardiography is the first-line diagnostic technique for the assessment of the right ventricle and right atrium, whereas cardiac magnetic resonance is considered the gold standard but is limited by cost and availability. According to the current guidelines, systolic RV function should be assessed by several conventional measurements, but the efficacy of these parameters as diagnostic and prognostic tools has been questioned by many authors...
August 10, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/28803252/two-dimensional-echocardiography-estimates-of-fetal-ventricular-mass-throughout-gestation
#11
Christina Y L Aye, Adam James Lewandowski, Eric O Ohuma, Ross Upton, Alice Packham, Yvonne Kenworthy, Fenella Roseman, Tess Norris, Malid Molloholli, Sikolia Wanyonyi, Aris T Papageorghiou, Paul Leeson
BACKGROUND: Two-dimensional (2D) ultrasound quality has improved in recent years. Quantification of cardiac dimensions is important to screen and monitor certain fetal conditions. We assessed the feasibility and reproducibility of fetal ventricular measures using 2D echocardiography, reported normal ranges in our cohort, and compared estimates to other modalities. METHODS: Mass and end-diastolic volume were estimated by manual contouring in the four-chamber view using TomTec Image Arena 4...
August 12, 2017: Fetal Diagnosis and Therapy
https://www.readbyqxmd.com/read/28802623/an-analytical-model-which-determines-the-apparent-t1-for-modified-look-locker-inversion-recovery-analysis-of-the-longitudinal-relaxation-under-the-influence-of-discontinuous-balanced-classical-molli-and-spoiled-gradient-echo-readouts
#12
Thomas Kampf, Theresa Reiter, Wolfgang Rudolf Bauer
Quantitative nuclear magnetic resonance imaging (MRI) shifts more and more into the focus of clinical research. Especially determination of relaxation times without/and with contrast agents becomes the foundation of tissue characterization, e.g. in cardiac MRI for myocardial fibrosis. Techniques which assess longitudinal relaxation times rely on repetitive application of readout modules, which are interrupted by free relaxation periods, e.g. the Modified Look-Locker Inversion Recovery = MOLLI sequence. These discontinuous sequences reveal an apparent relaxation time, and, by techniques extrapolated from continuous readout sequences, a putative real T1 is determined...
August 9, 2017: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/28802508/prognostic-significance-of-left-ventricular-fibrosis-in-patients-with-congenital-bicuspid-aortic-valve
#13
Gentian Lluri, Pierangelo Renella, J Paul Finn, Gabriel Vorobiof, Jamil Aboulhosn, Arjun Deb
This study sought to evaluate the prognostic value of left ventricular (LV) fibrosis assessed by late gadolinium enhancement (LGE) of the myocardium during cardiac magnetic resonance (CMR) imaging in patients with bicuspid aortic valve (BAV), which is associated with early aortic valve fibrosis and calcification. To what degree the LV myocardial wall is affected by fibrosis and its prognostic value is currently unknown. This is a retrospective, single-center study evaluating all adult patients with BAV who had CMR and followed from March 2002 to March 2016...
July 14, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28800546/mr-based-respiratory-and-cardiac-motion-correction-for-pet-imaging
#14
Thomas Küstner, Martin Schwartz, Petros Martirosian, Sergios Gatidis, Ferdinand Seith, Christopher Gilliam, Thierry Blu, Hadi Fayad, Dimitris Visvikis, F Schick, B Yang, H Schmidt, N F Schwenzer
PURPOSE: To develop a motion correction for Positron-Emission-Tomography (PET) using simultaneously acquired magnetic-resonance (MR) images within 90 s. METHODS: A 90 s MR acquisition allows the generation of a cardiac and respiratory motion model of the body trunk. Thereafter, further diagnostic MR sequences can be recorded during the PET examination without any limitation. To provide full PET scan time coverage, a sensor fusion approach maps external motion signals (respiratory belt, ECG-derived respiration signal) to a complete surrogate signal on which the retrospective data binning is performed...
August 3, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28798719/fulminant-acute-ascending-hemorrhagic-myelitis-treated-with-eculizumab
#15
Nang Boe Ohnmar Hsam, Klemens Angstwurm, Sebastian Peters, Kornelius Fuchs, Gerhard Schuierer, Ulrich Bogdahn, Robert Weissert
We describe an 18-year-old patient who developed back pain, rapidly ascending sensomotory deficits, bladder dysfunction, Lhermitte's sign, absent abdominal reflexes of all three levels, brisk tendon reflexes, and positive Babinski's sign. Magnetic resonance imaging of the spinal cord showed a long segment of cervical and thoracic intramedullary signal hyperintensity suggesting a longitudinally extensive transverse myelitis possibly within the course of a fast progressing ascending immune-mediated hemorrhagic myelopathy...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28797357/stress-perfusion-coronary-flow-reserve-versus-cardiac-magnetic-resonance-for-known%C3%A2-or%C3%A2-suspected-cad
#16
Shingo Kato, Naka Saito, Tatsuya Nakachi, Kazuki Fukui, Tae Iwasawa, Masataka Taguri, Masami Kosuge, Kazuo Kimura
BACKGROUND: Phase-contrast (PC) cine magnetic resonance imaging (MRI) of the coronary sinus is a noninvasive method to quantify coronary flow reserve (CFR). OBJECTIVES: This study sought to compare the prognostic value of CFR by cardiac magnetic resonance (CMR) and stress perfusion CMR to predict major adverse cardiac events (MACE). METHODS: Participants included 276 patients with known coronary artery disease (CAD) and 400 with suspected CAD...
August 15, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28794137/discrepant-measurements-of-maximal-left-ventricular-wall-thickness-between-cardiac-magnetic-resonance-imaging-and-echocardiography-in-patients-with-hypertrophic-cardiomyopathy
#17
Waseem Hindieh, Adaya Weissler-Snir, Helene Hammer, Arnon Adler, Harry Rakowski, Raymond H Chan
BACKGROUND: We sought to compare maximal left ventricular (LV) wall thickness (WT) measurements as obtained by routine clinical practice between echocardiography and cardiac magnetic resonance (CMR) and document causes of discrepancy. METHODS AND RESULTS: One-hundred and ninety-five patients with hypertrophic cardiomyopathy (median age, 52.8±15.1 years) who underwent echocardiography and CMR imaging within 6 months (median, 41 days; interquartile range, 16-97 days) were included...
August 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28791747/ecg-morphology-of-premature-ventricular-contractions-predicts-presence-of-myocardial-fibrotic-substrate-on-cardiac-magnetic-resonance-imaging-in-patients-undergoing-ablation
#18
Sabrina Oebel, Borislav Dinov, Arash Arya, Sebastian Hilbert, Philipp Sommer, Andreas Bollmann, Gerhard Hindricks, Ingo Paetsch, Cosima Jahnke
BACKGROUND: The most likely origin of PVCs may be deduced from surface ECG analysis while planning an electrophysiological study (EPS). Apart from purely benign forms of increased ventricular ectopy, myocardial substrate (e.g., regional fibrosis) may be present in certain cases, which will significantly impact the ablation approach. CMR imaging can reliably identify fibrotic target lesions and, hence, may assist in adequate patient selection and procedural planning. METHODS AND RESULTS: We analyzed 101 patients (59% male, mean age 57...
August 9, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28789598/development-of-a-computerized-4-d-mri-phantom-for-liver-motion-study
#19
Chunhao Wang, Fang-Fang Yin, W P Segars, Zheng Chang, Lei Ren
PURPOSE: To develop a 4-dimensional computerized magnetic resonance imaging phantom with image textures extracted from real patient scans for liver motion studies. METHODS: The proposed phantom was developed based on the current version of 4-dimensional extended cardiac-torso computerized phantom and a clinical magnetic resonance scan. Initially, the extended cardiac-torso phantom was voxelized in abdominal-chest region at the end of exhalation phase. Structures/tissues were classified into 4 categories: (1) Seven key textured organs, including liver, gallbladder, spleen, stomach, heart, kidneys, and pancreas, were mapped from a clinical T1-weighted liver magnetic resonance scan using deformable registration...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28783715/fully-automatic-left-ventricular-myocardial-strain-estimation-in-2d-short-axis-tagged-magnetic-resonance-imaging
#20
Pedro Morais, Sandro Queirós, Brecht Heyde, Jan Engvall, Jan D 'hooge, João L Vilaça
Cardiovascular diseases are among the leading causes of death and frequently result in local myocardial dysfunction. Among the numerous imaging modalities available to detect these dysfunctional regions, cardiac deformation imaging through tagged magnetic resonance imaging (t-MRI) has been an attractive approach. Nevertheless, fully automatic analysis of these data sets is still challenging. In this work, we present a fully automatic framework to estimate left ventricular myocardial deformation from t-MRI. This strategy performs automatic myocardial segmentation based on B-spline explicit active surfaces, which are initialized using an annular model...
August 7, 2017: Physics in Medicine and Biology
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