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Cardiac MRI

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https://www.readbyqxmd.com/read/28432954/fully-automatic-left-ventricular-segmentation-from-long-axis-cardiac-cine-mr-scans
#1
Rahil Shahzad, Qian Tao, Oleh Dzyubachyk, Marius Staring, Boudewijn P F Lelieveldt, Rob J van der Geest
With an increasing number of large-scale population-based cardiac magnetic resonance (CMR) imaging studies being conducted nowadays, there comes the mammoth task of image annotation and image analysis. Such population-based studies would greatly benefit from automated pipelines, with an efficient CMR image analysis workflow. The purpose of this work is to investigate the feasibility of using a fully-automatic pipeline to segment the left ventricular endocardium and epicardium simultaneously on two orthogonal (vertical and horizontal) long-axis cardiac cine MRI scans...
April 13, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28430739/downstream-indication-to-revascularization-following-hybrid-cardiac-pet-mri-preliminary-results
#2
Julien Priamo, Dionysos Adamopoulos, Oliver Rager, Angela Frei, Stephane Noble, David Carballo, Osman Ratib, René Nkoulou
BACKGROUND: Hybrid PET/MRI allows the acquisition of both fluorine-18-fluorodeoxyglucose (F-FDG) PET and cardiac magnetic resonance (CMR) during one session. Whether this will result in different referral to coronary revascularization (CR) is unknown. We compared this new hybrid method with all-nuclear/all-CMR methods in the assessment of viable myocardium and in downstream referral to CR. PATIENTS AND METHODS: Overall, 12 patients with rest perfusion defects on a single photon emission computed tomography (SPECT) were recruited for cardiac viability assessment using a PET/MRI device...
April 20, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28430115/a-systematic-review-of-3-d-printing-in-cardiovascular-and-cerebrovascular-diseases
#3
Zhonghua Sun, Shen Yuan Lee
OBJECTIVE: The application of 3-D printing has been increasingly used in medicine, with research showing many applications in cardiovascular disease. This systematic review analyzes those studies published about the applications of 3-D printed, patient-specific models in cardiovascular and cerebrovascular diseases. METHODS: A search of PubMed/Medline and Scopus databases was performed to identify studies investigating the 3-D printing in cardiovascular and cerebrovascular diseases...
April 10, 2017: Anatolian Journal of Cardiology
https://www.readbyqxmd.com/read/28430109/acquisition-of-electrocardiogram-signals-during-magnetic-resonance-imaging
#4
Julien Oster, Gari Clifford
The recording of the electrocardiogram (ECG) during Magnetic Resonance Imaging (MRI) acquisition is of great interest and importance. Firstly, MRI acquisition is a relatively slow process, which therefore complicates the imaging of moving organs. Cardiac MRI requires the development of strategies for acquiring high quality images, which is mainly achieved by synchronising the image acquisition with a specific time during the cardiac cycle. The ECG is used to monitor the heart's activity, and the detection of the largest and steepest peak in the cardiac cycle (the QRS complex) triggers the acquisition of slices of the k-space...
April 21, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28429537/preliminary-findings-on-the-safety-of-1-5-and-3-tesla-magnetic-resonance-imaging-in-cardiac-pacemaker-patients
#5
V F van Dijk, P P H M Delnoy, J J J Smit, R A Ramdat Misier, A Elvan, H W van Es, B J W M Rensing, G Raciti, L V A Boersma
INTRODUCTION: Modern pacemakers are designed to allow patients to undergo Magnetic Resonance Imaging(MRI) under a set of specific conditions. Aim of this study is to provide confirmatory evidence of safety and performance of a new pacing system (ImageReady™, Boston Scientific) in patients undergoing 1.5 and 3 Tesla(T) MRI. METHODS AND RESULTS: Two prospective, non-randomized, single-arm studies were designed to provide confirmatory data of no impact of MRI on device function, lead parameters and patient conditions in subjects implanted with the system undergoing a clinically non-indicated 1...
April 21, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28428213/clinically-feasible-microstructural-mri-to-quantify-cervical-spinal-cord-tissue-injury-using-dti-mt-and-t2-weighted-imaging-assessment-of-normative-data-and-reliability
#6
A R Martin, B De Leener, J Cohen-Adad, D W Cadotte, S Kalsi-Ryan, S F Lange, L Tetreault, A Nouri, A Crawley, D J Mikulis, H Ginsberg, M G Fehlings
BACKGROUND AND PURPOSE: DTI, magnetization transfer, T2*-weighted imaging, and cross-sectional area can quantify aspects of spinal cord microstructure. However, clinical adoption remains elusive due to complex acquisitions, cumbersome analysis, limited reliability, and wide ranges of normal values. We propose a simple multiparametric protocol with automated analysis and report normative data, analysis of confounding variables, and reliability. MATERIALS AND METHODS: Forty healthy subjects underwent T2WI, DTI, magnetization transfer, and T2*WI at 3T in <35 minutes using standard hardware and pulse sequences...
April 20, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28427801/-multimodality-imaging-in-the-cardiac-catheterization-laboratory
#7
Karine Warin-Fresse, Sébastien Hascoet, Patrice Guérin
Cardiac catheterization has greatly contributed to the progress made in the management of congenital heart diseases (CHD). Initially used in diagnosis, it allowed the understanding of heart diseases, their anatomy and hemodynamics. Gradually, the development of interventional cardiology has played a major role in the management of these malformations (Patent ductus arteriosus [PDA] and atrial septal defect [ASD] closure, pulmonary dilatation, percutaneous pulmonary valve implantation…). The development of such technology was made possible through the concomitant development of imaging techniques: fluoroscopy, ultrasound, MRI and CT...
April 17, 2017: La Presse Médicale
https://www.readbyqxmd.com/read/28426728/pulmonary-vascular-volume-impaired-left-ventricular-filling-and-dyspnea-the-mesa-lung-study
#8
Carrie P Aaron, Eric A Hoffman, Joao A C Lima, Steven M Kawut, Alain G Bertoni, Jens Vogel-Claussen, Mohammadali Habibi, Katja Hueper, David R Jacobs, Ravi Kalhan, Erin D Michos, Wendy S Post, Martin R Prince, Benjamin M Smith, Bharath Ambale-Venkatesh, Chia-Ying Liu, Filip Zemrak, Karol E Watson, Matthew Budoff, David A Bluemke, R Graham Barr
BACKGROUND: Evaluation of impaired left ventricular (LV) filling has focused on intrinsic causes of LV dysfunction; however, pulmonary vascular changes may contribute to reduced LV filling and dyspnea. We hypothesized that lower total pulmonary vascular volume (TPVV) on computed tomography (CT) would be associated with dyspnea and decrements in LV end-diastolic volume, particularly among ever-smokers. METHODS: The Multi-Ethnic Study of Atherosclerosis recruited adults without clinical cardiovascular disease in 2000-02...
2017: PloS One
https://www.readbyqxmd.com/read/28420004/hearing-loss-and-risk-of-mild-cognitive-impairment-and-dementia-findings-from-the-singapore-longitudinal-ageing-study
#9
Rebecca Heywood, Qi Gao, Ma Shwe Zin Nyunt, Lei Feng, Mei Sian Chong, Wee Shiong Lim, Philip Yap, Tih-Shih Lee, Keng Bee Yap, Shiou Liang Wee, Tze Pin Ng
AIM: To investigate the associations between hearing loss and prevalent and incident mild cognitive impairment (MCI), dementia and MCI or dementia (all cases). METHODS: Cross-sectional and longitudinal analyses of baseline and follow-up data were performed in a population-based cohort. The baseline sample of 2,599 adults aged ≥55 included 1,515 cognitively normal subjects who were followed up to 8 years. Hearing loss at baseline was determined by the whispered voice test, and MCI and dementia by Mini-Mental State Examination screening, Clinical Dementia Rating scale, neurocognitive tests, MRI, and panel consensus diagnosis...
April 19, 2017: Dementia and Geriatric Cognitive Disorders
https://www.readbyqxmd.com/read/28418949/initial-experience-with-simultaneous-18f-fdg-pet-mri-in-the-evaluation-of-cardiac-sarcoidosis-and-myocarditis
#10
Kate Hanneman, Michael Kadoch, Henry H Guo, Mehran Jamali, Andrew Quon, Andrei Iagaru, Robert Herfkens
PURPOSE: The purpose of this study was to compare combined PET/MRI with PET/CT and cardiac MRI in the evaluation of cardiac sarcoidosis and myocarditis. METHODS: Ten patients (4 men and 6 women; 56.1 ± 9.6 years old) were prospectively enrolled for evaluation of suspected cardiac sarcoidosis or myocarditis. Written informed consent was obtained. Following administration of 9.9 ± 0.9 mCi F-FDG, patients underwent standard cardiac PET/CT followed by combined PET/MRI using a simultaneous 3-T scanner...
April 17, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28416842/-drainage-characteristic-of-the-brain-interstitial-fluid-detected-by-using-fluorescence-and-magnetic-tracer-method
#11
Y Zhao, Y Q Li, H Y Li, Y L Li, L X Liu, L Yuan, S J Zhang, H B Han
OBJECTIVE: Compare the results of molecular diffusion and mass flow in the interstitial space(ISS) displayed by using optical and magnetic probes and study partitioned drainage of the brain interstitial fluid (ISF). METHODS: In the study, 36 male SD rats were randomly divided into fluorescent inspection group (18), magnetic tracer group (18). Then they were divided equally into caudate nucleus (Cn), thalamus (T) and substantia nigra (Sn) subgroup, 6 rats in each subgroup...
April 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28414679/misses-opportunity-tof-diagnoses-in-4th-decade-of-life
#12
O Baniahmad, T Jarreau, A Johnson
CASE: A 40 year old woman with a history of HIV, congestive heart failure secondary to an unknown congenital heart defect, and hypertension presented to our emergency department with worsening edema. On room air, oxygen saturation was 55 percent . On 5L of oxygen via nasal cannula, oxygen saturation was 88 percent . Physical examination was notable for central cyanosis, facial and lid edema, a II/VI holosystolic murmur across right chest radiating to entire right back hemithorax, decreased breath sounds at bases with pulmonary crackles, clubbing of fingers and edema of bilateral lower extremities...
March 2017: Journal of the Louisiana State Medical Society: Official Organ of the Louisiana State Medical Society
https://www.readbyqxmd.com/read/28414663/not-another-acs-rule-out
#13
S Preston, R Nelson, M Watts, D Smith, T Dewenter, D Spruill
CASE: A 50 year old African-American woman with diabetes, hypertension, and hyperlipidemia presented with progressively worsening retro-sternal chest pain, exacerbated by activity and relieved by rest. She also endorsed a thirty-pound unintentional weight loss, and dysphagia. She was dysarthric with left-sided Bell's Palsy and a palpable left axillary lymph node. She had been evaluated at several hospitals in the previous months for similar typical chest pain. Her troponin values were normal, and an EKG showed T-wave inversions in leads I and aVL...
March 2017: Journal of the Louisiana State Medical Society: Official Organ of the Louisiana State Medical Society
https://www.readbyqxmd.com/read/28412277/the-association-of-endothelial-function-and-tone-by-digital-arterial-tonometry-with-mri-left-ventricular-mass-in-african-americans-the-jackson-heart-study
#14
Avnish Tripathi, Emelia J Benjamin, Solomon K Musani, Naomi M Hamburg, Connie W Tsao, Arti Saraswat, Ramachandran S Vasan, Gary F Mitchell, Ervin R Fox
Peripheral vascular endothelial dysfunction assessed by digital peripheral arterial tonometry (PAT) has been associated with risk for adverse cardiovascular events. We examined the relations of peripheral microvascular dysfunction and left ventricular mass in a community-based cohort of African Americans. We examined participants of the Jackson Heart Study who had PAT and cardiac magnetic resonance imaging evaluations between 2007 and 2013. Consistent with pertinent literature, left ventricular mass index (LVMI) was adjusted for body size by indexing to height(2...
March 27, 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/28411261/feasibility-and-diagnostic-value-of-cardiovascular-magnetic-resonance-imaging-after-acute-ischemic-stroke-of-undetermined-origin
#15
Karl Georg Haeusler, Christian Wollboldt, Laura Zu Bentheim, Juliane Herm, Sebastian Jäger, Claudia Kunze, Holger-Carsten Eberle, Claudia Christina Deluigi, Oliver Bruder, Carolin Malsch, Peter U Heuschmann, Matthias Endres, Heinrich J Audebert, Andreas J Morguet, Christoph Jensen, Jochen B Fiebach
BACKGROUND AND PURPOSE: Etiology of acute ischemic stroke remains undetermined (cryptogenic) in about 25% of patients after state-of-the-art diagnostic work-up. METHODS: One-hundred and three patients with magnetic resonance imaging (MRI)-proven acute ischemic stroke of undetermined origin were prospectively enrolled and underwent 3-T cardiac MRI and magnetic resonance angiography of the aortic arch in addition to state-of-the-art diagnostic work-up, including transesophageal echocardiography (TEE)...
April 14, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28409752/early-appearance-of-tuberous-sclerosis-complex-on-cerebral-ultrasound-in-extremely-preterm-infant
#16
E B F Terpstra-Prinsen, K Kamphuis-Van Ulzen, K D Liem
Tuberous sclerosis complex (TSC) is an inherited neurocutaneous disorder. Diagnosis of early onset TSC in newborn infants is usually made by cardiac ultrasound because of circulatory problems due to cardiac rhabdomyoma. Early appearance of cortical tubers on cerebral ultrasound in newborn infants is very rare. Mostly TSC is diagnosed on MRI and not by cerebral ultrasound. Subependymal nodules are the usual presenting sign of TSC on cerebral ultrasound in neonates, which are often misdiagnosed as subependymal hemorrhage, calcifications or ischemic lesions after intrauterine germinal matrix hemorrhage...
April 8, 2017: Journal of Neonatal-perinatal Medicine
https://www.readbyqxmd.com/read/28409258/impact-of-knowledge-based-iterative-model-reconstruction-on-myocardial-late-iodine-enhancement-in-computed-tomography-and-comparison-with-cardiac-magnetic-resonance
#17
Yuki Tanabe, Teruhito Kido, Akira Kurata, Naoki Fukuyama, Takahiro Yokoi, Tomoyuki Kido, Teruyoshi Uetani, Mani Vembar, Amar Dhanantwari, Shinichi Tokuyasu, Natsumi Yamashita, Teruhito Mochizuki
We evaluated the image quality and diagnostic performance of late iodine enhancement computed tomography (LIE-CT) with knowledge-based iterative model reconstruction (IMR) for the detection of myocardial infarction (MI) in comparison with late gadolinium enhancement magnetic resonance imaging (LGE-MRI). The study investigated 35 patients who underwent a comprehensive cardiac CT protocol and LGE-MRI for the assessment of coronary artery disease. The CT protocol consisted of stress dynamic myocardial CT perfusion, coronary CT angiography (CTA) and LIE-CT using 256-slice CT...
April 13, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28409155/preservation-of-myocardial-perfusion-and-function-by-keeping-hypertrophied-heart-empty-and-beating-for-valve-surgery-an-in-vivo-mr-study-of-pig-hearts
#18
Jian Wang, Bo Xiang, Jixian Deng, Hung-Yu Lin, Darren H Freed, Rakesh C Arora, Ganghong Tian
Objectives. Normothermic hyperkalemic cardioplegia arrest (NHCA) may not effectively preserve hypertrophied myocardium during open-heart surgery. Normothermic normokalemic beating perfusion (NNBP), keeping hearts empty-beating, was utilized as an alternative to evaluate its cardioprotective role. Materials and Methods. Twelve hypertrophied pig hearts at 58.6 ± 7.2 days after ascending aorta banding underwent NNBP and NHCA, respectively. Near infrared myocardial perfusion imaging with indocyanine green (ICG) was conducted to assess myocardial perfusion...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28401251/delayed-myocardial-enhancement-in-pediatric-hypertrophic-cardiomyopathy-correlation-with-lv-function-echocardiography-and-demographic-parameters
#19
Sonia El Saiedi, Noha Hossam Behairy, Ahmed Kharabish, Reem Esmail, Zeinab Salah Seliem, Mervat Shafik, Wesam El Mozy
Our aim was (1) to detect the presence of fibrosis by Cardiac magnetic resonance imaging (CMR) in the pediatric age group. (2) Correlate CMR findings with demographic data, LV function, and other echocardiographic parameters. We studied 40 pediatric patients diagnosed as HCM by echocardiography. All patients were subjected to clinical examination (in which the NYHA classification was determined for each patient), echocardiography, and CMR. CMR was done on a 1.5T Philips Achieva scanner in SSFP with delayed myocardial enhancement (DE-MRI)...
April 11, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28399917/metformin-and-sulodexide-restore-cardiac-microvascular-perfusion-capacity-in-diet-induced-obese-rats
#20
Judith van Haare, M Eline Kooi, Jurgen W G E van Teeffelen, Hans Vink, Jos Slenter, Hanneke Cobelens, Gustav J Strijkers, Dennis Koehn, Mark J Post, Marc van Bilsen
BACKGROUND: Disturbances in coronary microcirculatory function, such as the endothelial glycocalyx, are early hallmarks in the development of obesity and insulin resistance. Accordingly, in the present study myocardial microcirculatory perfusion during rest and stress was assessed following metformin or sulodexide therapy in a rat model of diet-induced obesity. Additionally, the effect of degradation of the glycocalyx on myocardial perfusion was assessed in chow-fed rats. METHODS: Rats were fed a high fat diet (HFD) for 8 weeks and were divided into a group without therapy, and groups that received the anti-diabetic drug metformin or the glycocalyx-stabilizing drug sulodexide in their drinking water during the last 4 weeks of the feeding period...
April 11, 2017: Cardiovascular Diabetology
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