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Chen Yue Y College of Engineering, The University of Georgia, Athens, GA 30602 - - 2015
Magnetic resonance (MR) conditional robotic devices facilitate accurate interventional procedures under MR imaging (MRI) guidance. For this purpose, a compact (10-mm diameter) MR-conditional stepper motor is presented. The device features seven key components, which contribute to a dense and easy to fabricate design. Alternating bursts of pressurized air and vacuum ...
Cosic Irena - - 2014
Tubulin proteins were analyzed using the Resonant Recognition Model to predict possible electromagnetic resonances in tubulin and microtubules. We propose that these electromagnetic resonances are caused by charge transfer through the protein molecule. The frequencies of these electromagnetic resonances depend on charge velocity. Using different velocities of charge transfer, we ...
Wentland Andrew L AL Department of Medical Physics, University of Wisconsin School of Medicine & Public Health, Madison, Wisconsin, - - 2014
To evaluate velocity waveforms in muscle and to create a tool and algorithm for computing and analyzing muscle inertial forces derived from 2D phase contrast (PC) magnetic resonance imaging (MRI). PC MRI was performed in the forearm of four healthy volunteers during 1 Hz cycles of wrist flexion-extension as well ...
Sun Qi Q Department of Radiology,Ninth People's Hospital,School of Medicine,Shanghai Jiao Tong - - 2014
The study was aimed to determine and optimize the parameters for the MR fast imaging employing steady-state acquisition (FIESTA) sequence, which was to obtain an acceptable image to evaluate the value of the movement of the temporomandibular joint (TMJ). In this investigation, 20 volunteers were examined to determine and optimize ...
Lädermann A A Division of Orthopaedics and Trauma Surgery, La Tour Hospital, Switzerland; Faculty of Medicine, University of Geneva, Switzerland. Electronic address: - - 2014
Shoulder pain and injury are common in tennis players. The precise causes for such pain remain unclear. Impingement at critical tennis positions and glenohumeral instability have never been dynamically evaluated in vivo. The purpose of this study was to evaluate the different types of impingement and stability during tennis movements. ...
Torres-Ruiz Jose M JM INRA, University of Bordeaux, UMR BIOGECO; - - 2014
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Sheehan Scott E SE Department of Musculoskeletal Radiology, University of Wisconsin School of Medicine and Public Health, 600 Highland Avenue, Madison, WI 53792, USA. Electronic address: - - 2014
This article discusses common injury mechanisms and the subsequent constellation of magnetic resonance (MR) imaging findings in the knee following trauma in the context of instability, as distinguished by the degree of knee flexion and tibial rotation at the time of initial injury, in addition to the direction and magnitude ...
Chen Alexander - - 2014
Background:Electromagnetic navigation has improved the diagnostic yield of peripheral bronchoscopy for pulmonary nodules. For these procedures, a thin slice chest CT scan is performed prior to bronchoscopy at full inspiration and is used to create virtual airway reconstructions that are used as a map during bronchoscopy. Movement of the lung ...
Grimm Robert R Pattern Recognition Lab, FAU Erlangen-Nürnberg, Erlangen, Germany; Siemens AG Healthcare MR, Erlangen, Germany. Electronic address: - - 2014
Accurate localization and uptake quantification of lesions in the chest and abdomen using PET imaging is challenged by respiratory motion occurring during the exam. This work describes how a stack-of-stars MRI acquisition on integrated PET/MRI systems can be used to derive a high-resolution motion model, how many respiratory phases need ...
Akin Hakan H Department of Prosthodontics, Faculty of Dentistry, University of Cumhuriyet, Sivas, - - 2014
The purpose of this study was to analyze the static magnetic flux density of different types of new generation laser-welded magnetic attachments in the single position and the attractive position and to determine the effect of different corrosive environments on magnetic flux density. Magnetic flux densities of four magnetic attachment ...
Hedrick Michael S MS Department of Biological Sciences, University of North Texas, Denton, TX 76203, USA - - 2014
Lymph flux rates in anuran amphibians are high relative to those of other vertebrates owing to 'leaky' capillaries and a high interstitial compliance. Lymph movement is accomplished primarily by specialised lymph muscles and lung ventilation that move lymph through highly compartmentalised lymph sacs to the dorsally located lymph hearts, which ...
Greigarn Tipakorn T Department of Electrical Engineering and Computer Science, Case Western Reserve University, Cleveland, - - 2014
This paper presents a motion planning algorithm for Magnetic Resonance Imaging (MRI) actuated catheters for catheter ablation of atrial fibrillation. The MRI-actuated catheters is a new robotic catheter concept which utilizes MRI for remote steering and guidance. Magnetic moments generated by a set of coils wound near the tip are ...
Majumdar Angshul - - 2014
In Blind Compressed Sensing (BCS), both the sparsifying dictionary as well as the sparse coefficients are estimated simultaneously during signal recovery. A recent study adopted the BCS framework for recovering dynamic MRI sequences from under-sampled K-space measurements; the results were promising. Previous works in dynamic MRI reconstruction showed that, recovery ...
Chen Hai-Nan - - 2014
ObjectiveThis work aimed to assess tibial rotations, meniscal movements, and morphological changes during knee flexion and extension using kinematic magnetic resonance imaging (MRI).MethodsThirty volunteers with healthy knees were examined using kinematic MRI. The knees were imaged in the transverse plane with flexion and extension angles from 0° to 40° and ...
Wang Yuqing Y Department of Radiology, West China Hospital of Sichuan University, Chengdu 610041, P. R. - - 2014
As an initialization procedure for brain responding to subsequent movement execution (ME), the movement-readiness (MR)state is important for understanding the formation processes from daily movement training to long-term memory of movement pattern. As such, based on functional magnetic resonance imaging (fMRI), the net causal influences among regions contributing to premotor ...
Lee Junghoon J Department of Radiation Oncology and Molecular Radiation Sciences, The Johns Hopkins University, Baltimore, MD, USA; Department of Electrical and Computer Engineering, The Johns Hopkins University, Baltimore, MD, USA. Electronic address: - - 2014
Dynamic MRI has been widely used to track the motion of the tongue and measure its internal deformation during speech and swallowing. Accurate segmentation of the tongue is a prerequisite step to define the target boundary and constrain the tracking to tissue points within the tongue. Segmentation of 2D slices ...
Bertora Franco F Robotics, Brain and Cognitive Sciences Department, Istituto Italiano di Tecnologia, Genova, - - 2014
A study of the motor cortex during the programming, execution and mental representation of voluntary movement is of great relevance; its evaluation in conditions close to reality is necessary, given the close integration of the visuomotor, sensory feedback and proprioceptive systems, as of yet, a functional Magnetic Resonance Imaging (fMRI) ...
Smeets Daniel D Biocenter, Department of Biology II, Ludwig Maximilians University (LMU), Martinsried, Germany ; Department of Biochemistry, University of Oxford, Oxford, - - 2014
A Xist RNA decorated Barr body is the structural hallmark of the compacted inactive X territory in female mammals. Using super-resolution three-dimensional structured illumination microscopy (3D-SIM) and quantitative image analysis, we compared its ultrastructure with active chromosome territories (CTs) in human and mouse somatic cells, and explored the spatio-temporal process ...
Choudhri Asim F - - 2012
Advances in handheld computing now allow review of DICOM datasets from remote locations. As the diagnostic ability of this tool is unproven, we evaluated the ability to diagnose acute appendicitis on abdominal CT using a mobile DICOM viewer. This HIPAA compliant study was IRB-approved. Twenty-five abdominal CT studies from patients ...
Bos Alexandra Squires - - 2012
Objective-To determine accuracy, intermethod agreement, and inter-reviewer agreement for multisequence magnetic resonance imaging (MRI) and 2-view orthogonal myelography in small-breed dogs with first-time intervertebral disk (IVD) extrusion. Design-Prospective evaluation study. Animals-24 dogs with thoracolumbar IVD extrusion. Procedures-Each dog underwent MRI and myelography. Images obtained with each modality were independently evaluated ...
McAteer Martina A MA Department of Cardiovascular Medicine, Level 6 West Wing, John Radcliffe Hospital, Oxford OX3 9DU, United - - 2012
Endothelial cell activation is an important mediator of monocyte recruitment to sites of vascular inflammation. We hypothesized that high-affinity dual-ligand microparticles of iron oxide (MPIO), targeted to P-selectin and vascular cell adhesion molecule-1 (PV-MPIO), would identify activated endothelial cells during atherosclerosis progression. In vivo magnetic resonance imaging in apolipoprotein E-deficient ...
Takanami Kentaro - - 2012
A 58-year-old man with chylothorax after graft replacement of the aortic arch underwent thoracic duct scintigraphy by orally administered I-labeled 15-(4-iodophenyl)-3(R,S)-methylpentadecanoic acid with single-photon emission computed tomography combined with computed tomography (SPECT/CT). SPECT/CT fusion image clearly showed the increased uptake near the vascular anastomotic site of the aortic arch. Therefore, ...
Guerrero Waldo R - - 2012
Emergency medicine physicians are often faced with the challenging task of differentiating true acute ischemic strokes from stroke mimics. We present a case that was initially diagnosed as acute stroke. However, perfusion CT and EEG eventually led to the final diagnosis of status epilepticus. This case further asserts the role ...
Johnson Jamlik-Omari - - 2012
Gastrointestinal hemorrhage and mesenteric ischemia are two conditions that require rapid and accurate diagnosis. In this article, the author discusses these conditions in the light of current available diagnosing modalities, such as multi-detector computed tomography.
Burns Stephanie K - - 2012
Pulmonary embolism (PE) is the third most common acute cardiovascular disease after myocardial infarction and stroke. The prompt diagnosis, risk stratification, and treatment of patients with acute PE can reduce mortality. Multidetector row computed tomography pulmonary angiography (CTPA) is the most common study used to make the diagnosis of acute ...
Lai Vincent - - 2012
To review the diagnostic power of various computed tomography (CT) signs in acute appendicitis, in particular those initially classified as inconclusive. Retrospective review of 100 CT abdomen and pelvis studies with assessment of maximal luminal diameter, wall thickness and cross-sectional diameter of the appendix, periappendiceal inflammatory changes, and presence of ...
Allmendinger Andrew Mark - - 2012
Perfusion CT is being increasingly used as a diagnostic tool for the evaluation of acute ischemic stroke. It can be performed rapidly and aids in the detection of salvageable tissue (penumbra) from the unsalvageable core infarct. The purpose of this article is to provide an overview of the imaging technique, ...
Förster A - - 2012
Brain imaging in stroke aims at the detection of the relevant ischemic tissue pathology. Cranial computed tomography (CT) is frequently used in patients with transient ischemic attack (TIA) but no data is available on how it directly compares to magnetic resonance imaging (MRI). We compared detection of acute ischemic lesions ...
Yao Qun-Li - - 2011
To investigate fluctuations in the amplitude of low-frequency blood oxygenation level-dependent (BOLD) fMRI during acute brain ischemia, and to evaluate the use of amplitude of low-frequency fluctuations (ALFFs) in resting state fMRI for assessing super-acute focal cerebral ischemic stroke. A super-acute stroke model with middle cerebral artery occlusion (MCAO) in ...
Struffert T - - 2011
BACKGROUND AND PURPOSE:A new FPCT application offers the possibility of perfusion (FPCT CBV) and parenchymal (FPCT) imaging within the angiography suite. We tested the hypothesis that findings in FPCT CBV and FPCT would correlate with those obtained using MSCT and PCT.MATERIALS AND METHODS:In 16 patients with acute MCA occlusion, FPCT ...
Kim Hyun Cheol - - 2011
OBJECTIVES: To identify CT features that discriminate individuals with and without acute appendicitis in patients with equivocal CT findings, and to assess whether knowledge of these findings improves diagnostic accuracy. METHODS: 53 patients that underwent appendectomy with an indeterminate preoperative CT interpretation were selected and allocated to an acute appendicitis ...
Jeon Young Wook - - 2012
Although the detection of crossed cerebellar diaschisis (CCD) by means of different imaging modalities is well described, little is known about its diagnosis by computed tomography perfusion (CTP) imaging. We investigated the detection rate of CCD by CTP imaging and the factors related to CCD on CTP images in patients ...
Pulli Benjamin - - 2012
To test whether the relationship between acute ischemic infarct size on concurrent computed tomographic (CT) angiography source images and diffusion-weighted (DW) magnetic resonance images is dependent on the parameters of CT angiography acquisition protocols. This retrospective study had institutional review board approval, and all records were HIPAA compliant. Data in ...
Lettau Michael - - 2011
BACKGROUND AND PURPOSE: Diffusion-weighted imaging (DWI) is the key method for diagnosing acute ischemic stroke. Applied b values in stroke diffusion studies are usually in the range of 800-1500s/mm(2), but progress in magnetic resonance (MR) technology now permits higher b values. However, it is uncertain whether high-b-value DW sequences improve ...
Lopes Marcos Antonio - - 2011
ABSTRACTBackground: The neurobiological basis of increased risk of dementia in stroke patients is unclear, though there are several related pathological changes, including white matter hyperintensities (WMH), and medial temporal atrophy. Subcortical gray matter structures have also been implicated in dementia resulting from vascular pathology, particularly vascular dementia. This study aimed ...
Nagel Simon - - 2011
AIMS: We analyzed early diffusion-weighted magnetic resonance imaging of patients with acute basilar artery occlusion by applying different lesion scoring systems and determined their predictive value for favorable outcome. METHODS: Between 1998 and 2010, patients with confirmed basilar artery occlusion were entered in a local database. magnetic resonance imaging angiography ...
Yuh Esther L - - 2012
The admission noncontrast head computed tomography (CT) scan has been demonstrated to be one of several key early clinical and imaging features in the challenging problem of prediction of long-term outcome after acute traumatic brain injury (TBI). In this study, we employ two novel approaches to the problem of imaging ...
Tomiyasu Moyoko - - 2011
The changes in the signals for brain metabolites in the left cerebellum of a 14-year-old boy with acute hemicerebellitis were monitored using proton magnetic resonance spectroscopy (MRS). From the onset of disease treatment to long-term follow-up, MRS data were serially acquired from the left and right cerebella, basal ganglia (BG), ...
Tsujikawa Tetsuya - - 2011
Crossed cerebellar hyperperfusion (CCH) is detected in patients with epilepsy by brain perfusion studies including single photon emission computed tomography and positron emission tomography. In addition, brain perfusion can be studied with arterial spin labeling (ASL), which is a non-invasive MRI perfusion method that quantitatively measures cerebral blood flow per ...
Bellani Giacomo - - 2011
PURPOSE OF REVIEW: The review focuses on recent achievements obtained by means of imaging techniques in clinical and experimental studies on acute lung injury (ALI) and acute respiratory distress syndrome (ARDS). RECENT FINDINGS: The review focuses on four imaging techniques: computed tomography (CT), PET, electrical impedance tomography (EIT) and ultrasound, ...
Cocciolillo Fabrizio - - 2011
We report a case of atypical muscle localization of plasma cell leukemia (PCL), arisen from a secondary leukemic transformation of multiple myeloma (MM), detected by F-18 FDG PET/CT. A 57-year-old woman with a history of MM received chemotherapy and hematopoietic stem cell transplantation with complete treatment response. Five years later, ...
Amar Arun Paul - - 2011
Contemporary imaging technologies permit the rapid and accurate assessment of the acute stroke patient. These studies form the underpinning of all therapeutic approaches. Although unenhanced computed tomography remains the principal diagnostic examination to exclude hemorrhagic stroke, multimodal computed tomography and magnetic resonance imaging can be use to assess cerebral perfusion ...
Takahashi Noriyuki - - 2011
Our purpose in this study was to develop a computer-aided detection scheme for identification of hypoattenuation of acute stroke on unenhanced CT images to select patients for thrombolysis of acute stroke. This method is based on a z-score mapping method. The algorithm of the developed method consisted of five main ...
Maturen Katherine E - - 2011
This article illustrates the normal and pathologic sonographic appearances of bowel, with an emphasis on diagnostic ultrasound techniques. The current role of ultrasound for adult bowel evaluation is limited in the United States, with CT emerging as the primary modality for evaluation of the acute abdomen. However, mounting concerns regarding ...
Souza Leticia C S - - 2012
The utility of admission CT perfusion (CTP) to that of diffusion-weighted imaging (DWI) as a predictor of hemorrhagic transformation (HT) in acute stroke was compared. We analyzed the admission CTP and DWI scans of 96 consecutive stroke patients. HT was present in 22 patients (23%). Infarct core was manually segmented ...
Poh L E - - 2011
Accurate segmentation of ventricular cerebrospinal fluid (CSF) regions in stroke CT images is important in assessing stroke patients. Manual segmentation is subjective, time consuming and error prone. There are currently no methods dedicated to extracting ventricular CSF regions in stroke CT images. 102 ischemic stroke CT scans (slice thickness between ...
Nakka P - - 2011
AIM: To describe serial changes in brain magnetic resonance imaging (MRI) in acute human infection from two outbreaks of Hendra virus (HeV), relate these changes to disease prognosis, and compare HeV encephalitis to reported cases of Nipah virus encephalitis. MATERIALS AND METHODS: The MRI images of three human cases (two ...
Olivot J-M - - 2011
The extent of the penumbra and the core of an acute ischemic stroke influence, at the given time, the impact of the recanalization of the occluded vessel on the outcome. Research studies have demonstrated that quantitative MR diffusion imaging and, to a lesser extent, CT perfusion (CTP) could provide an ...
Ballard Dustin W - - 2011
BACKGROUND AND PURPOSE: We examined the impact of primary stroke center (PSC) certification on emergency department (ED) use and outcomes within an integrated delivery system in which EDs underwent staggered certification. METHODS: A retrospective cohort study of 30 461 patients seen in 17 integrated delivery system EDs with a primary diagnosis ...
Hesselmann V - - 2011
BACKGROUND AND PURPOSE:Our research focuses on interventional neuroradiology (stroke treatment including imaging methods) and general neuroimaging with an emphasis on functional MR imaging. Our aim was to determine the efficacy of revascularization (TIMI) of middle cerebral and/or carotid artery occlusion by means of mechanical recanalization techniques and to evaluate the ...
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