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Cardiac MRI

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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
#1
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/28814596/the-use-of-cardiac-mri-in-a-rare-case-of-primary-mural-endocarditis
#2
Mayur Patel, Zeshan Ahmad, Edward Distler, Brenen Swofford
No abstract text is available yet for this article.
August 16, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28814594/concomitant-carotid-aplasia-and-basilar-artery-occlusion-in-a-child-with-phaces-syndrome
#3
Noel Delgado, Jason J Carroll, Philip M Meyers
We report a case of an 8-year-old girl with posterior fossa abnormalities, haemangioma, arterial lesions, cardiac abnormalities or coarctation of the aorta and eye abnormalities syndrome with right carotid aplasia and complete basilar occlusion. The patient initially presented at 2.5 weeks of age with a growing right facial haemangioma involving segments 1, 3 and 4. Initial MRI at 2.5 weeks of age revealed an extraconal right orbital haemangioma without posterior fossa abnormalities and MR angiography (MRA) 3 weeks later showed right internal carotid aplasia...
August 16, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28813699/t1-and-t2-mapping-in-cardiology-mapping-the-obscure-object-of-desire
#4
Sophie Mavrogeni, Dimitris Apostolou, Panayiotis Argyriou, Stella Velitsista, Lilika Papa, Stelios Efentakis, Evangelos Vernardos, Mikela Kanoupaki, George Kanoupakis, Athanassios Manginas
The increasing use of cardiovascular magnetic resonance (CMR) is based on its capability to perform biventricular function assessment and tissue characterization without radiation and with high reproducibility. The use of late gadolinium enhancement (LGE) gave the potential of non-invasive biopsy for fibrosis quantification. However, LGE is unable to detect diffuse myocardial disease. Native T1 mapping and extracellular volume fraction (ECV) provide knowledge about pathologies affecting both the myocardium and interstitium that is otherwise difficult to identify...
August 17, 2017: Cardiology
https://www.readbyqxmd.com/read/28808515/palpitations-as-a-presenting-feature-of-multisystem-sarcoidosis
#5
Richie Manikat, Julieta Gilson, Mahesh Krishnamurthy, Koroush Khalighi
Introduction: Sarcoidosis is described as a systemic condition characterized by non-caseating granulomas in multiple organs. In this report, we present an unusual manifestation of cardiac sarcoidosis and review management strategies. Case presentation: A 29-year-old African-American man presented with weight loss, fatigue, dyspnea, palpitations, night sweats, painless left eye redness and bilateral leg pain over the course of three months. His physical exam revealed left conjunctival congestion and bilateral crackles on auscultation...
July 2017: Journal of Community Hospital Internal Medicine Perspectives
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
#6
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/28803216/3d-2d-registration-with-superabundant-vessel-reconstruction-for-cardiac-resynchronization-therapy
#7
Daniel Toth, Maria Panayiotou, Alexander Brost, Jonathan M Behar, Christopher A Rinaldi, Kawal S Rhode, Peter Mountney
A key component of image guided interventions is the registration of preoperative and intraoperative images. Classical registration approaches rely on cross-modality information; however, in modalities such as MRI and X-ray there may not be sufficient cross-modality information. This paper proposes a fundamentally different registration approach which uses adjacent anatomical structures with superabundant vessel reconstruction and dynamic outlier rejection. In the targeted clinical scenario of cardiac resynchronization therapy (CRT) delivery, preoperative, non contrast-enhanced, MRI is registered to intraoperative, contrasted X-ray fluoroscopy...
August 5, 2017: Medical Image Analysis
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
#8
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/28801204/improved-post-processing-strategy-for-molli-based-tissue-characterization-allows-application-in-patients-with-dyspnoe-and-impaired-left-ventricular-function
#9
Thomas Kampf, Wolfgang Rudolf Bauer, Theresa Reiter
Contrast and non-contrast MRI based characterization of myocardium by T1-mapping will be of paramount importance to obtain biomarkers, e.g. fibrosis, which determines the risk of heart failure patients. T1-mapping by the standard post-processing of the modified look-locker inversion recovery (MOLLI) lacks of accuracy when trying to reduce its duration, which on the other hand, is highly desirable in patients with heart failure. The recently suggested inversion group fitting (IGF) technique, which considers more parameters for fitting, has a superior accuracy for long T1 times despite a shorter duration...
August 8, 2017: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/28800546/mr-based-respiratory-and-cardiac-motion-correction-for-pet-imaging
#10
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/28797357/stress-perfusion-coronary-flow-reserve-versus-cardiac-magnetic-resonance-for-known%C3%A2-or%C3%A2-suspected-cad
#11
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/28789598/development-of-a-computerized-4-d-mri-phantom-for-liver-motion-study
#12
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
#13
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
https://www.readbyqxmd.com/read/28781924/cerebral-microhemorrhage-a-frequent-magnetic-resonance-imaging-finding-in-pediatric-patients-after-cardiopulmonary-bypass
#14
Paggie P C Kim, Benjamin W Nasman, Erica L Kinne, Udochukwu E Oyoyo, Daniel K Kido, J P Jacobson
OBJECTIVES: This study was undertaken to estimate the incidence and burden of cerebral microhemorrhage (CM) in patients with heart disease who underwent cardiopulmonary bypass (CPB), as detected on susceptibility-weighted imaging (SWI), a magnetic resonance (MR) sequence that is highly sensitive to hemorrhagic products. MATERIALS AND METHODS: With Institutional Review Board waiver of consent, MR imaging (MRI) of a cohort of 86 consecutive pediatric patients with heart failure who underwent heart transplantation evaluation were retrospectively reviewed for CM...
2017: Journal of Clinical Imaging Science
https://www.readbyqxmd.com/read/28781414/test-suite-for-image-based-motion-estimation-of-the-brain-and-tongue
#15
Jordan Ramsey, Jerry L Prince, Arnold D Gomez
Noninvasive analysis of motion has important uses as qualitative markers for organ function and to validate biomechanical computer simulations relative to experimental observations. Tagged MRI is considered the gold standard for noninvasive tissue motion estimation in the heart, and this has inspired multiple studies focusing on other organs, including the brain under mild acceleration and the tongue during speech. As with other motion estimation approaches, using tagged MRI to measure 3D motion includes several preprocessing steps that affect the quality and accuracy of estimation...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28781130/cardiac-function-improvement-and-bone-marrow-response-outcome-analysis-of-the-randomized-perfect-phase-iii-clinical-trial-of-intramyocardial-cd133-application-after-myocardial-infarction
#16
Gustav Steinhoff, Julia Nesteruk, Markus Wolfien, Günther Kundt, Jochen Börgermann, Robert David, Jens Garbade, Jana Große, Axel Haverich, Holger Hennig, Alexander Kaminski, Joachim Lotz, Friedrich-Wilhelm Mohr, Paula Müller, Robert Oostendorp, Ulrike Ruch, Samir Sarikouch, Anna Skorska, Christof Stamm, Gudrun Tiedemann, Florian Mathias Wagner, Olaf Wolkenhauer
OBJECTIVE: The phase III clinical trial PERFECT was designed to assess clinical safety and efficacy of intramyocardial CD133(+) bone marrow stem cell treatment combined with CABG for induction of cardiac repair. DESIGN: Multicentre, double-blinded, randomised placebo controlled trial. SETTING: The study was conducted across six centres in Germany October 2009 through March 2016 and stopped due slow recruitment after positive interim analysis in March 2015...
August 2017: EBioMedicine
https://www.readbyqxmd.com/read/28780621/an-international-consensus-on-the-appropriate-evaluation-and-treatment-for-adults-with-spinal-deformity
#17
Sigurd H Berven, Steven J Kamper, Niccole M Germscheid, Benny Dahl, Christopher I Shaffrey, Lawrence G Lenke, Stephen J Lewis, Kenneth M Cheung, Ahmet Alanay, Manabu Ito, David W Polly, Yong Qiu, Marinus de Kleuver
PURPOSE: Evaluation and surgical management for adult spinal deformity (ASD) patients varies between health care providers. The purpose of this study is to identify appropriateness of specific approaches and management strategies for the treatment of ASD. METHODS: From January to July 2015, the AOSpine Knowledge Deformity Forum performed a modified Delphi survey where 53 experienced deformity surgeons from 24 countries, rated the appropriateness of management strategies for multiple ASD clinical scenarios...
August 5, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28780562/rationale-and-design-of-a-multicentre-prospective-randomised-controlled-clinical-trial-to-evaluate-the-efficacy-of-the-adipose-graft-transposition-procedure-in-patients-with-a-myocardial-scar-the-agtp-ii-trial
#18
Paloma Gastelurrutia, Carolina Gálvez-Montón, Maria Luisa Cámara, Juan Bustamante-Munguira, Pablo García-Pavia, Pablo Avanzas, J Alberto San Román, Domingo Pascual-Figal, Eduardo de Teresa, Maria G Crespo-Leiro, Nicolás Manito, Julio Núñez, Francisco Fernández-Avilés, Ángel Caballero, Albert Teis, Josep Lupón, Ramón Brugada, Carlos Martín, Jacobo Silva, Ana Revilla-Orodea, Sergio J Cánovas, Jose M Melero, Jose J Cuenca-Castillo, Angel Gonzalez-Pinto, Antoni Bayes-Genis
INTRODUCTION: Cardiac adipose tissue is a source of progenitor cells with regenerative capacity. Studies in rodents demonstrated that the intramyocardial delivery of cells derived from this tissue improves cardiac function after myocardial infarction (MI). We developed a new reparative approach for damaged myocardium that integrates the regenerative properties of cardiac adipose tissue with tissue engineering. In the adipose graft transposition procedure (AGTP), we dissect a vascularised flap of autologous pericardial adipose tissue and position it over the myocardial scarred area...
August 4, 2017: BMJ Open
https://www.readbyqxmd.com/read/28778011/dynamic-bicycle-exercise-to-assess-cardiac-output-at-multiple-exercise-levels-during-magnetic-resonance-imaging
#19
Johan Heiberg, Benjamin Asschenfeldt, Marie Maagaard, Steffen Ringgaard
PURPOSE: The aim was to establish a method for performing dynamic exercise during magnetic resonance imaging (MRI) using a slowly increasing workload protocol. METHODS: An ergometer bicycle with a step-wise, exercise protocol was used. Real-time phase-contrast MRI images of the aorta were obtained at each exercise step. RESULTS: In total, 40 participants completed the exercise protocol to reach a mean maximum cardiac output of 13.7±3.7l/min and a heart rate of 150±16beats/min at the highest exercise level...
July 27, 2017: Clinical Imaging
https://www.readbyqxmd.com/read/28776823/mri-of-patients-with-implanted-cardiac-devices
#20
REVIEW
Bobby Kalb, Julia H Indik, Peter Ott, Diego R Martin
Cardiac implanted electronic devices (CIEDs) have historically been regarded as a contraindication for performing magnetic resonance imaging (MRI), limiting the availability of this exam for large numbers of patients who may have otherwise benefited from the unique diagnostic capabilities of MRI. Interactions between CIEDs and the magnetic field associated with MRI systems have been documented, and include potential effects on CIED function, lead heating, and force/torque on the generator. Several device manufacturers have developed "MR-Conditional" CIEDs with specific hardware and software design changes to optimize the device for the MR environment...
August 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
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