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https://www.readbyqxmd.com/read/28432835/detection-of-soft-tissue-abscess-comparison-of-diffusion-weighted-imaging-to-contrast-enhanced-mri
#1
Chang Woo Chun, Joon-Yong Jung, Jun Seung Baik, Won-Hee Jee, Sun Ki Kim, Seung Han Shin
PURPOSE: To compare the diagnostic performances of diffusion-weighted imaging (DWI)-combined magnetic resonance imaging (MRI) performed without intravenous contrast material with gadolinium contrast material-enhanced (CE) MRI for diagnosing soft-tissue abscesses. MATERIALS AND METHODS: In all, 119 patients (mean age: 56 years) with skin and soft-tissue infection who underwent contrast-enhanced MRI with DWI (b = 0-800) were included. Two readers independently reviewed both image sets-nonenhanced conventional MR images (NECI)+DWI, and NECI+contrast enhanced fat-suppressed T1 -weighted imaging (CEFST1 )-for the presence of abscess...
April 22, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28431009/artefact-free-late-gadolinium-enhancement-imaging-in-patients-with-implanted-cardiac-devices-using-a-modified-broadband-sequence-current-strategies-and-results-from-a-real-world-patient-cohort
#2
Sebastian Hilbert, Alexander Weber, Kay Nehrke, Peter Börnert, Bernhard Schnackenburg, Sabrina Oebel, Ricardo Spampinato, Cathleen Rogge, Sergio Richter, Gerhard Hindricks, Ingo Paetsch, Cosima Jahnke
Aims: Cardiac magnetic resonance (CMR) imaging in patients with implanted cardiac devices is often limited by device-related imaging artefacts. Limitations can potentially be overcome by employing a broadband late gadolinium enhancement (LGE)-CMR imaging technique. The purpose of this study was to investigate the relationship between implanted cardiac devices and the optimal frequency offset on broadband LGE-CMR imaging to increase the artefact-free visibility of myocardial segments. Methods and results: A phantom study was performed to characterize magnetic field disturbances related to 15 different cardiac devices...
April 18, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28430739/downstream-indication-to-revascularization-following-hybrid-cardiac-pet-mri-preliminary-results
#3
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/28427710/clinical-outcomes-and-predictive-factors-related-to-good-outcomes-in-plasma-exchange-in-severe-attack-of-nmosd-and-long-extensive-transverse-myelitis-case-series-and-review-of-the-literature
#4
Saharat Aungsumart, Metha Apiwattanakul
OBJECTIVE: To investigate the predictive factors associated with good outcomes of plasma exchange in severe attacks through neuromyelitis optica spectrum disorder (NMOSD) and long extensive transverse myelitis (LETM). In addition, to review the literature of predictive factors associated with the good outcomes of plasma exchange in central nervous system inflammatory demyelinating diseases (CNS IDDs). METHODS: Retrospective study in 27 episodes of severe acute attacks myelitis and optic neuritis in 24 patients, including 20 patients with NMOSD seropositive, 1 patient with NMOSD seronegative and 3 patients with LETM...
April 2017: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/28427705/presence-of-central-veins-and-susceptibility-weighted-imaging-for-evaluating-lesions-in-multiple-sclerosis-and-leukoaraiosis
#5
Urška Lamot, Jernej Avsenik, Saša Šega, Katarina Šurlan Popovič
PURPOSE: The process of demyelination in multiple sclerosis (MS) is reflected in lesions of the central nervous system (CNS), which are found in an abundance of different diseases and are frequently radiographically indistinguishable. Our aim was to determine whether the perivenous distribution of MS lesions identified on susceptibility weighted images (SWI) could be used as a specific radiographic sign for MS, and also to determine whether the visibility of the central vein (CV) is affected by the activity of MS lesions...
April 2017: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/28426840/multimodality-multiparametric-brain-tumors-evaluation
#6
Vasiliki Tsitsia, Patricia Svolou, Eftichia Kapsalaki, Kyriaki Theodorou, Katerina Vassiou, Varvara Valotassiou, Panagiotis Georgoulias, Ioannis Fezoulidis, Ioannis Tsougos
Brain tumors represent a vast group of lesions, originating from different neuronal cells with different degrees of aggressiveness. Despite some technological advances either pre or post-treatment, these tumors may share similar imaging findings and properties, rendering diagnosis/prognosis, an ambiguous process. Gadolinium-enhanced magnetic resonance imaging remains the gold standard for providing detailed morphologic information, but presents several limitations due to the overlap of findings, in cases such as progressive tumor and post-radiation related effects...
January 2017: Hellenic Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/28426209/channel-assisted-proton-conduction-behavior-in-hydroxyl-rich-lanthanide-based-magnetic-metal-organic-frameworks
#7
Soumava Biswas, Jayita Chakraborty, Vijay Singh Parmar, Siba Prasad Bera, Nirmal Ganguli, Sanjit Konar
Two new lanthanide-based 3D metal-organic frameworks (MOFs), {[Ln(L)(Ox)(H2O)]n·xH2O} [Ln = Gd(3+) and x = 3 (1) and Dy(3+) and x = 1.5 (2); H2L = mucic acid; OxH2 = oxalic acid] showing interesting magnetic properties and channel-mediated proton conduction behavior, are presented here. Single-crystal X-ray structure analysis shows that, in complex 1, the overall structure originates from the mucate-bridged gadolinium-based rectangular metallocycles. The packing view reveals the presence the two types of hydrophilic 1D channels filled with lattice water molecules, which are strongly hydrogen-bonded with coordinated water along the a and b axes, whereas for complex 2, the 3D framework originates from a carboxylate-bridged dysprosium-based criss-cross-type secondary building block...
April 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28424090/targeted-endomyocardial-biopsy-guided-by-real-time-cardiovascular-magnetic-resonance
#8
Christina Unterberg-Buchwald, Christian Oliver Ritter, Verena Reupke, Robin Niklas Wilke, Christine Stadelmann, Michael Steinmetz, Andreas Schuster, Gerd Hasenfuß, Joachim Lotz, Martin Uecker
BACKGROUND: Endomyocardial biopsies (EMB) are an important diagnostic tool for myocarditis and other infiltrative cardiac diseases. Routinely, biopsies are obtained under fluoroscopic guidance with a substantial radiation burden. Despite procedural success, there is a large sampling error caused by missing the affected myocardium. Therefore, multiple (>6) biopsies are taken in the clinical setting. In cardiovascular magnetic resonance (CMR), late gadolinium enhancement (LGE) depicts areas of affected myocardium in myocarditis or in other infiltrative cardiomyopathies...
April 19, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28421305/the-utility-of-global-longitudinal-strain-in-the-identification-of-prior-myocardial-infarction-in-patients-with-preserved-left-ventricular-ejection-fraction
#9
Graham J Fent, Pankaj Garg, James R J Foley, Laura E Dobson, Tarique A Musa, Bara Erhayiem, John P Greenwood, Sven Plein, Peter P Swoboda
Prior myocardial infarction (MI) is associated with increased mortality and is prevalent in certain high risk patient groups. Electrocardiogram may be used in diagnosis, however, sensitivity is limited, thus non-invasive imaging techniques may improve diagnosis. We investigated whether global longitudinal strain (GLS) and longitudinal strain parameters are reduced in patients with prior MI but preserved left ventricular ejection fraction (LVEF). The study included 40 clinical patients with prior MI occurring >3 months previously (defined as subendocardial hyperenhancement on late Gadolinium enhancement imaging) with LVEF ≥ 55% and 40 controls matched for age and LVEF...
April 18, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28420598/1-5-t-augmented-reality-navigated-interventional-mri-paravertebral-sympathetic-plexus-injections
#10
David R Marker, Paweena U Thainual, Tamas Ungi, Aaron J Flammang, Gabor Fichtinger, Iulian I Iordachita, John A Carrino, Jan Fritz
PURPOSE: The high contrast resolution and absent ionizing radiation of interventional magnetic resonance imaging (MRI) can be advantageous for paravertebral sympathetic nerve plexus injections. We assessed the feasibility and technical performance of MRI-guided paravertebral sympathetic injections utilizing augmented reality navigation and 1.5 T MRI scanner. METHODS: A total of 23 bilateral injections of the thoracic (8/23, 35%), lumbar (8/23, 35%) and hypogastric (7/23, 30%) paravertebral sympathetic plexus were prospectively planned in twelve human cadavers using a 1...
April 18, 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28419612/delayed-gadolinium-enhanced-mri-of-cartilage-dgemric-and-t2-mapping-of-talar-osteochondral-lesions-indicators-of-clinical-outcomes
#11
Christoph Rehnitz, Benita Kuni, Felix Wuennemann, Dimitrios Chloridis, Anand Kirwadi, Iris Burkholder, Hans-Ulrich Kauczor, Marc-André Weber
PURPOSE: To evaluate the utility of delayed gadolinium-enhanced magnetic resonance imaging of cartilage (dGEMRIC) and T2 mapping in evaluation of type II osteochondral lesions (OCLs) of the talus and define cutoff values for identifying patients with good/poor clinical outcomes. MATERIALS AND METHODS: 28 patients (mean age, 42.3 years) underwent T2 mapping and dGEMRIC at least 1.5 years (mean duration, 3.5 years) after microfracture (n = 12) or conservative (n = 16) treatment for type II OCL...
April 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28419319/influence-of-concentration-nanoparticle-size-beam-energy-and-material-on-dose-enhancement-in-radiation-therapy
#12
Chulhwan Hwang, Ja Mee Kim, JungHoon Kim
The purpose of this study was to analyse the effects of the type, concentration, and nanoparticle diameter of dose enhancement materials on the dose enhancement of low- and high-energy megavoltage (MV) X-rays acquired from a medical linear accelerator using Monte Carlo simulation. Monte Carlo simulation was performed with the Monte Carlo N-Particle Transport (MCNPX) code, using the energy spectrum of the linear accelerator and a mathematical Snyder head phantom. A 5-cm-diameter virtual tumour was defined in the centre of the phantom...
April 17, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28418949/initial-experience-with-simultaneous-18f-fdg-pet-mri-in-the-evaluation-of-cardiac-sarcoidosis-and-myocarditis
#13
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
#14
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/28416425/-bilateral-facial-nerve-palsy-associated-with-epstein-barr-virus-infection-in-a-3-year-old-boy
#15
M Grassin, A Rolland, N Leboucq, A Roubertie, F Rivier, P Meyer
Bilateral facial nerve palsy is a rare and sometimes difficult diagnosis. We describe a case of bilateral simultaneous facial nerve palsy associated with Epstein-Barr virus (EBV) infection in a 3-year-old boy. Several symptoms led to the diagnosis of EBV infection: the clinical situation (fever, stomachache, and throat infection), white blood cell count (5300/mm(3) with 70% lymphocyte count), seroconversion with EBV-specific antibodies, lymphocytic meningitis, and a positive blood EBV polymerase chain reaction (9...
April 14, 2017: Archives de Pédiatrie: Organe Officiel de la Sociéte Française de Pédiatrie
https://www.readbyqxmd.com/read/28415747/comparison-of-gadolinium-enhanced-mri-and-18fdg-pet-pet-ct-for-the-diagnosis-of-brain-metastases-in-lung-cancer-patients-a-meta-analysis-of-5-prospective-studies
#16
Ye Li, Guanqiao Jin, Danke Su
OBJECTIVE: We undertook this meta-analysis to compare the significance of Gadolinium-enhanced MRI and 18FDG PET/PET-CT for diagnosing brain metastases of lung cancer patients. RESULTS: Five articles comprising 941 patients were included for analysis. The sensitivities with 95% confidence interval for PET/PET-CT and MRI were 0.21 (0.13 - 0.32) and 0.77 (95% CI = 0.60 - 0.89), specificities were 1.00 (0.99 - 1.00) and 0.99 (0.97 - 1.00), and the areas under curve were 0...
March 14, 2017: Oncotarget
https://www.readbyqxmd.com/read/28415060/-a-case-of-foramen-magnum-meningioma-manifesting-as-hypoglossal-nerve-palsy
#17
Yasufumi Inaka, Naoki Otani, Sho Nishida, Hideaki Ueno, Arata Tomiyama, Satoshi Tomura, Terushige Toyooka, Kojiro Wada, Kentaro Mori
We report a case of foramen magnum meningioma manifesting as hypoglossal nerve palsy. A 72-year-old woman presented with progressive hypoglossal nerve palsy and lingual atrophy on the left side. Gadolinium-enhanced T1-weighted magnetic resonance imaging revealed a heterogeneously enhanced mass lesion with dural tail sign partially extending into the hypoglossal canal. The transcondylar approach was performed to expose the hypoglossal canal and resect the tumor completely. Histological examination revealed a transitional meningioma...
April 2017: No Shinkei Geka. Neurological Surgery
https://www.readbyqxmd.com/read/28414345/three-color-vibrational-cars-thermometry-of-fuel-rich-ethylene-air-flames-using-a-potassium-gadolinium-tungstate-raman-active-crystal-as-a-source-of-narrowband-probe-radiation
#18
Christian Meißner, Johannes W Tröger, Dimitrii N Kozlov, Frank Beyrau, Thomas Seeger
Three-color broadband vibrational coherent anti-Stokes Raman scattering (CARS) temperature measurements were carried out in laminar fuel-rich sooting ethylene/air flames. Stimulated Raman scattering (SRS) of a picosecond pump laser pulse in a Raman-active potassium gadolinium tungstate [KGd(WO<sub>4</sub>)<sub>2</sub>] crystal was employed as a source of narrowband probe radiation. In the three-color CARS experiment, this wavelength-shifted radiation enables N<sub>2</sub>-based vibrational CARS temperature measurements in sooting flames free of the signal interference with the absorption/emission bands of the flame intermediate radicals C<sub>2</sub>...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28413713/catastrophic-outcome-of-patients-with-a-rebound-after-natalizumab-treatment-discontinuation
#19
Inés González-Suarez, Luis Rodríguez de Antonio, Aida Orviz, Sara Moreno-García, María D Valle-Arcos, Jordi A Matias-Guiu, Cristina Valencia, Manuela Jorquera Moya, Celia Oreja-Guevara
INTRODUCTION: Natalizumab (NTZ) is an effective drug for the treatment of relapsing-remitting multiple sclerosis. In some patients discontinuation is mandatory due to the risk of progressive multifocal leukoencephalopathy. However, severe clinical and radiological worsening has been described after drug cessation. Our aim was to describe the clinical and radiological features of the rebound phenomenon. MATERIAL AND METHODS: Patients switched from NTZ to Fingolimod (FTY) who had presented a rebound after discontinuation were selected...
April 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28412420/stress-perfusion-cmr-in-patients-with-known-and-suspected-cad-prognostic-value-and-optimal-ischemic-threshold-for-revascularization
#20
Gabriella Vincenti, Pier Giorgio Masci, Pierre Monney, Tobias Rutz, Sarah Hugelshofer, Mirdita Gaxherri, Olivier Muller, Juan F Iglesias, Eric Eeckhout, Valentina Lorenzoni, Cyril Pellaton, Christophe Sierro, Juerg Schwitter
OBJECTIVES: This study sought to determine the ischemia threshold and additional prognostic factors that identify patients for safe deferral from revascularizations in a large cohort of all-comer patients with known or suspected coronary artery disease (CAD). BACKGROUND: Stress-perfusion cardiac magnetic resonance (CMR) is increasingly used in daily practice for ischemia detection. However, there is insufficient evidence about the ischemia burden that identifies patients who benefit from revascularization versus those with a good prognosis who receive drugs only...
April 10, 2017: JACC. Cardiovascular Imaging
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