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Lemos João J Departments of Neurology (JL, BS, LC), Neuroradiology (DP), and Otorhinolaryngology (MA, AP), Coimbra University Hospital Center, Coimbra, - - 2014
: We describe a patient with downbeat nystagmus (DBN) evoked only by eye closure. Brain and spinal cord magnetic resonance imaging revealed a T2 paramedian lesion in the left lower basis pontis and other white matter lesions consistent with multiple sclerosis. One potential mechanism for DBN in this case involves ...
Chakram S S Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, - - 2014
We study the mechanical properties of stoichiometric SiN resonators through a combination of spectroscopic and interferometric imaging techniques. At room temperature, we demonstrate ultrahigh quality factors of 5×107 and a f×Q product of 1×1014  Hz. To our knowledge, these correspond to the largest values yet reported for mesoscopic flexural resonators. Through ...
Wang Hao - - 2014
We numerically demonstrate selective absorption of visible light in film-coupled nanoparticle metamaterials by excitation of magnetic resonance. The physical mechanism of magnetic resonance is elucidated with the help of electromagnetic field distribution. Resonance wavelengths are shown to be strongly dependent on geometric parameters. Representative inductor-capacitor models are employed to further ...
Li Chiye - - 2014
Photoacoustic (PA) endoscopy for human urogenital imaging has the potential to diagnose many important diseases, such as endometrial and prostate cancers. We have specifically developed a 12.7 mm diameter, rigid, side-scanning PA endoscopic probe for such applications. The key features of this endoscope are the streamlined structure for smooth cavity introduction ...
Khan I I Department of Radiology, King's College Hospital, London, - - 2014
Bowel and mesenteric injuries are relatively uncommon but associated with significant morbidity and mortality. Early recognition is crucial, and multidetector computed tomography (MDCT) now has a central role in the evaluation of patients with a history of trauma. In this review, we describe the MDCT appearances of bowel and mesenteric ...
Chen Wengen W University of Maryland School of Medicine, Baltimore, MD, USA, - - 2014
Diagnosis of cardiac mechanical device or prosthesis valve infection, and more importantly accurate localization of the infection site, such as defibrillator pocket, pacemaker lead, annular or peri-annular valve ring abscesses remain clinically challenging. Inconclusive diagnosis can lead to delayed antibiotic therapy, device extraction or surgical intervention, which may have dire ...
Bruns Brandon Robert BR From the University of Maryland Medical Center (B.R.B., R.T., C.S., A.L., T.M.S., D.M.S.), Shock Trauma and Anesthesiology Research-Organized Research Center (J.K.), R Adams Cowley Shock Trauma Center, Baltimore, - - 2014
Blunt cerebrovascular injury (BCVI) is reported to occur in approximately 2% of blunt trauma patients, with a stroke rate of up to 20%. Guidelines for BCVI screening are based on clinical and radiographic findings. We hypothesized that liberal screening of the neck vasculature, as part of initial computed tomographic (CT) ...
Nazzal Munier M University of Toledo Medical Center, Toledo, OH. Electronic address: - - 2014
This case report presents the challenges associated with the existing screening modalities in the diagnosis of carotid artery dissection, and also reviews the diagnostic efficiency, limitations, and recent advances in imaging technology. A 54-year-old man with blunt trauma and subsequent development of ischemic stroke and no clear initial evidence of carotid ...
Wetherill Reagan R RR Department of Psychiatry, University of Pennsylvania, Philadelphia, PA 19104, USA. Electronic address: - - 2014
Although several sex differences in nicotine dependence have been identified, the neural mechanisms underlying these sex differences are not clear. The present study examines sex differences in resting-state brain activity using an arterial spin labeling (ASL) perfusion imaging technique. Fifty-one (31 males) sated nicotine-dependent cigarette smokers underwent perfusion functional magnetic ...
Horga Guillermo G Department of Psychiatry, New York State Psychiatric Institute and College of Physicians and Surgeons, Columbia University, New York, NY, - - 2014
The widespread use of Magnetic Resonance Imaging (MRI) in the study of child- and adult-onset developmental psychopathologies has generated many investigations that have measured brain structure and function in vivo throughout development, often generating great excitement over our ability to visualize the living, developing brain using the attractive, even seductive ...
Gorchon J J Laboratoire de Physique des Solides, Université Paris-Sud, CNRS, UMR8502, 91405 Orsay, - - 2014
We show experimental evidence of magnetization switching in a single (Ga,Mn)(As,P) semiconducting ferromagnetic layer, attributed to a strong reduction of the magnetization and the anisotropy due to current injection. The nucleation of magnetization reversal is found to occur even in the absence of a magnetic field and to be both ...
Dubow Jordan S JS Department of Neurology and Neurosciences, Weill Cornell Medical College, New York, New - - 2014
Intracranial atherosclerotic disease (ICAD) is one of the most common causes of ischemic stroke worldwide. Although the pathogenesis of cerebral infarct in ICAD has been reported from autopsy series, the mechanism of stroke is not well known. This study used baseline perfusion imaging and diffusion-weighted imaging (DWI) or computerized tomography ...
Erdem Hakan - - 2014
We evaluated patients admitted to the intensive care units with the diagnosis of community acquired pneumonia (CAP) regarding initial radiographic findings. A multicenter retrospective study was held. Chest x ray (CXR) and computerized tomography (CT) findings and also their associations with the need of ventilator support were evaluated. A total ...
Matsuo Ryu R Department of Medicine and Clinical Science, Fukuoka, - - 2014
The mechanism of cerebral decompression sickness (DCS) is still unclear. We report 2 cases of breath-hold divers with cerebral DCS in whom magnetic resonance imaging (MRI) demonstrated distinctive characteristics. One case presented right hemiparesthesia, diplopia, and gait disturbance after breath-hold diving into the sea at a depth of 20 m. ...
Takahashi Mitsuhiko M Department of Orthopaedics, the Institute of Health Biosciences, the University of - - 2014
Background The accessory navicular bone is one of the most common accessory ossicles, which sometimes become symptomatic. Abnormalities in magnetic resonance (MR) image, e. g. edema-like bone marrow pattern, have been reported for symptomatic accessory navicular. However, it has not been completely understood the edema-like bone marrow pattern correlates to ...
Dubois Jessica J INSERM, U992, Cognitive Neuroimaging Unit, Gif-sur-Yvette, France;CEA, NeuroSpin Center, Gif-sur-Yvette, France;University Paris Sud, Orsay, France. Electronic address: - - 2013
Studying how the healthy human brain develops is important to understand early pathological mechanisms and to assess the influence of fetal or perinatal events on later life. Brain development relies on complex and intermingled mechanisms especially during gestation and first post-natal months, with intense interactions between genetic, epigenetic and environmental ...
Neumann Dawn D Department of Physical Medicine and Rehabilitation, Rehabilitation Hospital of Indiana, Indiana University School of Medicine, 4141 Shore Drive, Indianapolis, IN, 46254, USA, - - 2013
The ability to recognize others' emotions is critical to successful interpersonal interactions. Given its importance, there has been an extensive amount of research using functional magnetic resonance imaging (fMRI) to investigate the neurobiological mechanisms associated with facial affect recognition in healthy individuals, and some in patient populations with affective disorders. ...
Anwar Shafkat S Department of Pediatrics, Division of Cardiology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of - - 2013
We report the case of a 2.5-year-old patient with single-ventricle physiology who underwent cardiac magnetic resonance study for cyanosis after Kawashima operation. Magnetic resonance imaging study showed a veno-venous collateral redirecting systemic venous flow, responsible for cyanosis.
Mucha Armin - - 2013
Single photon emission computerized tomography and conventional computerized tomography (SPECT/CT) tracer uptake has been shown to reflect the loading history of the tibiofemoral knee joint and correlate with the mechanical and anatomical alignment. It was our primary purpose to develop a novel standardized SPECT/CT algorithm for patients undergoing high tibial ...
Xiao Guanjun - - 2013
There is an urgent need for the development in the field of the magnetism of topological insulators, owing to the necessity for the realization of the quantum anomalous Hall effect. Herein, we discuss experimentally fabricated nanostructured hierarchical architectures of the topological insulator Bi2 Te3 without the introduction of any exotic ...
Maquer Ghislain - - 2013
Degeneration of the intervertebral disc, sometimes associated with low back pain and abnormal spinal motions, represents a major health issue with high costs. A non-invasive degeneration assessment via qualitative or quantitative MRI (magnetic resonance imaging) is possible, yet, no relation between mechanical properties and T2 maps of the intervertebral disc ...
Poehlmann Melanie M Department of Physical Chemistry II, University of Bayreuth, Universitätsstraße 30, DE-95440 Bayreuth, Germany. - - 2013
Polymer-shelled magnetic microbubbles have great potential as hybrid contrast agents for ultrasound and magnetic resonance imaging. In this work, we studied US/MRI contrast agents based on air-filled poly(vinyl alcohol)-shelled microbubbles combined with superparamagnetic iron oxide nanoparticles (SPIONs). The SPIONs are integrated either physically or chemically into the polymeric shell of ...
Chavarria Laia - - 2013
Brain alterations such as hepatic encephalopathy or brain edema are usually associated with liver failure. The mechanisms that lead to the generation of edema seem to be different depending on the course of liver failure (acute, chronic or acute-on-chronic liver failure). Several neuroimaging methods allow a non-invasive assessment of brain ...
Cortés Campos A - - 2013
Atelectasis is an important indicator of potentially severe underlying disease that must be diagnosed as early as possible. One of the most common mechanisms is the reabsorption of air distal to respiratory tract obstruction. The chest X-ray is an excellent tool to diagnose atelectasis, and it is especially useful for ...
El Amine Nour - - 2013
During cytokinesis, closure of the actomyosin contractile ring (CR) is coupled to the formation of a midbody ring (MR), through poorly understood mechanisms. Using time-lapse microscopy of Drosophila melanogaster S2 cells, we show that the transition from the CR to the MR proceeds via a previously uncharacterized maturation process that ...
Tanaka Terumitsu - - 2013
Magnetization mechanisms of nanoscale magnetic grains greatly differ from well-known magnetization mechanisms of micrometer- or millimeter-sized magnetic grains or particles. Magnetization switching mechanisms of nanoscale exchange-coupled composite (ECC) grain in a microwave field was studied using micromagnetic simulation. Magnetization switching involving a strongly damped or precessional oscillation was studied using ...
Schön Stephan N - - 2013
The current study investigates whether patella height and tilt or leg alignment influence the intensity values as well as the distribution pattern of single photon emission computerized tomography/computerized tomography (SPECT/CT) tracer uptake in the patellofemoral joint. 99mTc-HDP-SPECT/CT and radiographs of consecutive 84 knees were prospectively obtained. Lateral radiographs were analyzed ...
Castellanos-Gomez Andres - - 2013
Mechanical resonators are fabricated from freely suspended single-layer MoS2 . Their dynamics  have been studied by optical interferometry. These resonators behave as membranes with resonance frequencies in between 10 and 30 MHz and quality factors in between 16 and 109. We also demonstrate clear signatures of nonlinear resonance in these ...
Lee Hyowon - - 2013
The mechanical robustness of microfabricated torsional magnetic actuators in withstanding the strong static fields (7 T) and time-varying field gradients (17 T/m) produced by an MR system was studied in this investigation. The static and dynamic mechanical characteristics of 30 devices were quantitatively measured before and after exposure to both ...
Golba Krzysztof - - 2013
The mechanisms underlying functional mitral regurgitation (MR) and the relation between mechanism and severity of MR have not been evaluated in a large, multicenter, randomized controlled trial. Transesophageal echocardiography (TEE) was performed in 215 patients at 17 centers in the Surgical Treatment for Ischemic Heart Failure (STICH) trial. Both 2-dimensional ...
Yu Ping - - 2013
We present a novel broken-nanoring, which can realize strongly localized confinement and highly enhancement for both electric and magnetic fields at two resonant modes excited by normal incident azimuthally polarized light. Two resonant modes of the broken-nanoring are formed by different resonant mechanisms as different resonant lengths. The physical model ...
Chang Eric Y - - 2013
We report the occurrence of a short radiolunate ligament rupture in a rock climber. To our knowledge, an isolated traumatic rupture of this ligament has not been described in the literature, and awareness of this entity allows initiation of therapy. The magnetic resonance imaging and ultrasound appearances are reviewed and ...
Borotikar Bhushan S - - 2013
To establish an in vivo, normative patellofemoral cartilage contact mechanics database acquired during voluntary muscle control using a novel dynamic magnetic resonance (MR) imaging-based computational methodology and validate the contact mechanics sensitivity to the known sub-millimeter methodological inaccuracies. Dynamic cine phase-contrast and multi-plane cine images were acquired while female subjects ...
Ataollahi Asghar - - 2013
This paper presents a novel MR-compatible 3-DOF cardiac catheter steering mechanism. The catheter's steerable structure is tendon driven and consists of miniature deflectable, helical segments created by a precise rapid prototyping technique. The created catheter prototype has an outer diameter of 9 Fr (3 mm) and a steerable distal end ...
Ellingson Arin M - - 2013
Study Design. Experimental correlation study design to quantify features of disc health, including signal intensity and distinction between the annulus fibrosus (AF) and nucleus pulposus (NP), with T2* magnetic resonance imaging (MRI) and correlate with the functional mechanics in corresponding motion segments.Objective. Establish the relationship between disc health assessed by ...
Kawakubo Masateru - - 2013
We investigated the clinical performance of evaluation of cardiac mechanical dyssynchrony with longitudinal strain analysis using four-chamber (4CH) cine magnetic resonance imaging (MRI). 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 ...
Ciuffreda P - - 2013
Bone bruises are focal abnormalities in subchondral bone marrow due to trabecular microfractures as a result of traumatic force. These trauma-induced lesions are better detected with magnetic resonance (MR) imaging using water-sensitive sequences. Moreover, the pattern of bone bruise is distinctive and allows us to understand the dynamics of trauma ...
Bozzetto Juliette - - 2013
Nonosseous uptakes are occasionally found on bone scintigraphy. Most of them are easily explained by current pathophysiological mechanisms (metastatic calcifications, metabolic process, or extravascular accumulation of radiopharmaceutical) or current artifacts. Other unusual findings are still unexplained. We report 1 didactic case of incidental gallbladder uptake on bone scan. Additional single-photon ...
Koepp Matthias J - - 2013
Juvenile myoclonic epilepsy (JME) has been classified as a syndrome of idiopathic generalized epilepsy and is characterized by specific types of seizures, showing a lack of pathology using magnetic resonance imaging (MRI) and computed tomography scanning. However, JME is associated with a particular personality profile, and behavioral and neuropsychological studies ...
Taourel P - - 2013
Management of mechanical occlusion, particularly of the small intestine, has altered considerably over recent years, with a change of paradigm and the indication for surgery depending on the cause of the occlusion and any signs of entrapment or strangulation. It is therefore important today to make a positive diagnosis of ...
Howe Benjamin Matthew - - 2013
In this report we present a patient with a recent diagnosis of cervical adenocarcinoma with progressive left lower extremity pain and weakness. MR imaging of the pelvis and subsequent FDG CT/PET were complementary in demonstrating abnormalities worrisome for perineural spread of malignancy, which was confirmed with an open fascicular biopsy ...
Kang Dong-Hun - - 2013
We recently experienced self-detachment of the Solitaire stent during mechanical thrombectomy of acute ischemic stroke. Then, we tried to remove the detached stent and to recanalize the occlusion, but failed with endovascular means. The following diffusion weighted image MRI revealed no significant increase in infarction size, therefore, we performed surgical ...
Ferreira Pedro F - - 2013
The multitude of applications offered by CMR make it an increasing popular modality to study the heart and the surrounding vessels. Nevertheless the anatomical complexity of the chest, together with cardiac and respiratory motion, and the fast flowing blood, present many challenges which can possibly translate into imaging artefacts. The ...
Dimmick Simon - - 2013
Femoroacetabular impingement (FAI) of the hip is a well-recognized entity that can cause hip pain and limit range of motion. Although there are 2 types of FAI (cam and pincer), these 2 entities most commonly coexist. Plain radiographs and magnetic resonance imaging are commonly used to assess FAI, and play ...
Tedeschi G - - 2013
Migraine is a neurologic disorder characterized by disabling attacks of throbbing headache with specific features and associated symptoms. Despite the recent discoveries in basic neurosciences, migraine pathophysiology is not completely understood. Nevertheless, in the last decades, advances in functional magnetic resonance imaging (fMRI) have significantly provided new insights into migraine ...
Lalani Tasneem - - 2013
A fundamental consideration in the workup of a jaundiced patient is the pretest probability of mechanical obstruction. Ultrasound is the first-line modality to exclude biliary tract obstruction. When mechanical obstruction is present, additional imaging with CT or MRI can clarify etiology, define level of obstruction, stage disease, and guide intervention. ...
Ruggieri V G - - 2013
The visualization of bioprosthesis leaflet morphology might help to better understand the underlying mechanism of dysfunction in degenerated aortic bioprosthesis. Because today such visualization of bioprosthesis leaflet morphology is intricate to impossible with other imaging techniques, we hypothesized that the processing of multi-detector CT images would allow better visualization of ...
Fadda A - - 2013
This case report describes the magnetic resonance imaging (MRI) findings and the treatment of a far lateral extrusion of disc material at the sixth and seventh lumbar vertebrae (L6-L7) in a five-year-old male Alpine Dachsbracke dog referred to our hospital for investigation of the complaint of a one week progressive ...
Miller Robert - - 2013
: Mechanical low back pain is common in the pediatric population; recent studies have shown that undiagnosed mechanical low back pain (UMLBP) is the most common cause of low back pain presenting in adolescents, accounting for up to 78% of cases. Spondylolysis/spondylolisthesis is the most common cause with diagnosed pathology ...
Alcalde Oscar - - 2013
BACKGROUND: Normal pacemaker response to magnet and programmer is almost universal and helps to interpret basal rhythm. METHODS AND RESULTS: In this report, we report an undescribed atypical magnet response due to an internal cross-talk with atrial oversensing during a specific part of interrogation, simulating atrial fibrillation.
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