Search Results
Results 1 - 50 of 1251
1 2 3 4 5 6 7 8 9 10 >
Fuxjager Matthew J MJ Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA - - 2014
Loggerhead sea turtle hatchlings (Caretta caretta) use regional magnetic fields as open-ocean navigational markers during trans-oceanic migrations. Little is known, however, about the ontogeny of this behaviour. As a first step towards investigating whether the magnetic environment in which hatchlings develop affects subsequent magnetic orientation behaviour, eggs deposited by nesting ...
Yarnykh Vasily L VL From the Department of Radiology, University of Washington, 1959 NE Pacific St, Seattle, WA 98195 (V.L.Y., K.R.M.); Multiple Sclerosis Center (J.D.B., P.R., A.M., P.Q., B.G., L.K.J.H.) and Department of Radiology (B.P.K.), Swedish Neuroscience Institute, Seattle, Wash; and Department of Radiology, University of Wisconsin, Madison, Wis - - 2014
Purpose To evaluate the clinical utility of fast whole-brain macromolecular proton fraction (MPF) mapping in multiple sclerosis (MS) and compare MPF with established quantitative magnetic resonance (MR) imaging measures of tissue damage including magnetization transfer (MT) ratio and relaxation rate (R1). Materials and Methods In this institutional review board-approved and ...
Sasaki Naoko N Division of Cardiology, Department of Medicine, Nihon University School of Medicine, Tokyo, - - 2014
Catheter tip contact force (CF) and 3-dimensional (3D) maps are key to mapping and ablation of atrial fibrillation (AF). To determine the relation between CF and 3D map surfaces. We conducted a validation study of Carto-based 3D ultrasound (3D-US) and 3D-US merged with CT (3D-Merge-CT) left atrium/pulmonary vein (PV) images. ...
Allones J L JL Department of Electronics and Computer Science Campus Vida, University of Santiago de Compostela, Santiago de Compostela, La Coruña, 15782, Spain, - - 2014
Clinical terminologies are considered a key technology for capturing clinical data in a precise and standardized manner, which is critical to accurately exchange information among different applications, medical records and decision support systems. An important step to promote the real use of clinical terminologies, such as SNOMED-CT, is to facilitate ...
Thornhill Rebecca E RE The Ottawa Hospital, Ottawa, Ontario, - - 2014
To determine if differentiation of lipoma from liposarcoma on magnetic resonance imaging can be improved using computer-assisted diagnosis (CAD). Forty-four histologically proven lipomatous tumors (24 lipomas and 20 liposarcomas) were studied retrospectively. Studies were performed at 1.5T and included T1-weighted, T2-weighted, T2-fat-suppressed, short inversion time inversion recovery, and contrast-enhanced sequences. ...
Padfield Emma E Emergency Department, Kings College Hospital, London, United - - 2014
To determine whether the Emergency Department (ED) could effectively identify patients with suspected cauda equina or cord compression who warranted further investigation with MRI, and thus request MRI without prior review from neurosurgeons. The ED proforma for management of patients with back pain was assessed with focus on the referral ...
Chung Yong Eun YE Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine, 250 Seongsanno, Seodaemun-gu, Seoul, - - 2014
ABSTRACT Purpose/Aim of the study. To assess the feasibility of krypton-enhanced ventilation CT using dual energy (DE) technique for various krypton concentrations and to determine the appropriate krypton concentration for DE ventilation CT through an animal study. Materials and Methods. Baseline DECT was first performed on seven New Zealand white ...
Beeres Martin M Department of Diagnostic and Interventional Radiology, Clinic of the Goethe University, Frankfurt, Germany - - 2014
Computed tomography (CT) gantry rotation time is one factor influencing image quality. Until now, there has been no report investigating the influence of gantry rotation time on chest CT image quality. To investigate the influence of faster gantry rotation time on image quality and subjective and objective image parameters in ...
Schaap Kristel K Institute for Risk Assessment Sciences, Division of Environmental Epidemiology, Utrecht University, Utrecht 3508 TD, Netherlands; - - 2014
Clinical and research staff who work around magnetic resonance imaging (MRI) scanners are exposed to the static magnetic stray fields of these scanners. Although the past decade has seen strong developments in the assessment of occupational exposure to electromagnetic fields from MRI scanners, there is insufficient insight into the exposure ...
Reurink Gustaaf G Department of Orthopedics, Erasmus Medical Centre, Room Hs-104, PO Box 2040, 3000 CA, Rotterdam, The Netherlands, - - 2014
Sports physicians are increasingly requested to perform magnetic resonance imaging (MRI) of acute hamstring muscle injuries and to provide a prognosis of the time to return to play (RTP) on the basis of their findings. To systematically review the literature on the prognostic value of MRI findings for time to ...
Weissler Bjoern B Clinical Application Research, Philips Research Europe-Aachen, Pauwelsstrasse 17, D-52074 Aachen, Germany. Department of Physics of Molecular Imaging Systems, Institute of Experimental Molecular Imaging, RWTH Aachen University, Pauwelsstrasse 20, D-52074 Aachen, Germany. Institute of High Frequency Technology, RWTH Aachen University, Melatener Straße 25, D-52074 Aachen, Germany, Pauwelsstrasse 20, D-52074 Aachen, - - 2014
The combination of Positron Emission Tomography (PET) and Magnetic Resonance Imaging (MRI) into a single device is being considered a promising tool for molecular imaging as it combines the high sensitivity of PET with the functional and anatomical images of MRI. For highest performance, a scalable, MR compatible detector architecture ...
Pittschieler Elisabeth E Department of Orthodontics, Bernhard Gottlieb University Clinic of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090 Vienna, Austria. Electronic address: - - 2014
To 1) test the feasibility of delayed Gadolinium-Enhanced Magnetic Resonance Imaging of Cartilage (dGEMRIC) at 3 Tesla in the temporomandibular joint (TMJ) and 2) to determine the optimal delay for measurements of the TMJ disc after i.v. contrast agent (CA) administration. Design MRI of the right and left TMJ of ...
Takayama Tatsuya - - 2014
New imaging modalities to assess the efficacy of drugs that have molecular targets remain under development. Here, we describe for the first time the use of time-resolved three-dimensional phase-contrast magnetic resonance imaging to monitor changes in blood supply to a tumor during sunitinib treatment in a patient with localized renal ...
Menegaux F F Service de chirurgie générale, viscérale et endocrinienne, hôpital de la Pitié-Salpetrière, 47, boulevard de l'Hôpital, 75013 Paris, France. Electronic address: - - 2014
Improvements in medical imaging have resulted in the incidental discovery of many silent and unrecognized adrenal tumors. The term "adrenal incidentaloma" (AI) is applied to any adrenal mass≥1cm in its longest axis that is discovered incidentally during abdominal imaging that was not performed to specifically evaluate adrenal pathology. These incidentalomas ...
Rogers Harriet J HJ aSchool of Experimental Psychology and Bristol Clinical Research and Imaging Centre, University of Bristol, Bristol, UK bDepartment of Neurobiology, A.I. Virtanen Institute, University of Eastern Finland, Kuopio, - - 2014
One in four ischaemic stroke patients are ineligible for thrombolytic treatment due to unknown onset time. Quantification of absolute MR relaxation times and signal intensities are potential methods for estimating stroke duration. We compared the accuracy of these approaches and determined whether changes in relaxation times and signal intensities identify ...
Gill Suki - - 2014
Purpose: This study analyses seminal vesicle displacement relative to the prostate and in relation to treatment time. A group of eleven patients undergoing prostate cancer radiotherapy were imaged with a continuous 3 T cine-MRI in the standard treatment setup position. Four images were recorded every 4 seconds for 15 minutes ...
Rube Martin A MA Division of Imaging and Technology, Institute for Medical Science and Technology, University of Dundee, Wilson House, 1 Wurzburg Loan, Dundee, DD2 1FD, UK, - - 2014
Interventional MRI has significant potential for image guidance of iliac angioplasty and related vascular procedures. A technology framework with in-room image display, control, communication and MRI-guided intervention techniques was designed and tested for its potential to provide safe, fast and efficient MRI-guided angioplasty of the iliac arteries. A 1.5-T MRI ...
Aellen Jerome J University Institute for Diagnostic and Interventional Neuroradiology, University Hospital Bern and Inselspital, University of Bern, Freiburgstrasse 4, 3010, Bern, - - 2014
To investigate pathological findings in the susceptibility weighted imaging (SWI) of patients experiencing convulsive (CSE) or non-convulsive status epilepticus (NCSE) with focal hyperperfusion in the acute setting. Twelve patients (six with NCSE confirmed by electroencephalogram (EEG) and six patients with CSE with seizure event clinically diagnosed) underwent MRI in this ...
Zhu Honglei H Department of Otolaryngology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, - - 2014
It has been reported that about half of patients with sudden sensorineural hearing loss (SSNHL) show high signals in the affected inner ear on three-dimensional, fluid-attenuated inversion recovery magnetic resonance imaging (3D-FLAIR MRI). These signals may reflect minor hemorrhage or an increased concentration of protein in the inner ear, which ...
Detiger Suzanne E L SE Department of Orthopaedic Surgery, VU University Medical Center, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands, - - 2014
To evaluate intervertebral disc (IVD) degeneration and treatments, an objective diagnostic tool is needed. Recently, T2* relaxation time mapping was proposed as a technique to assess early IVD degeneration, yet the correlation with biochemical content and histological features has not been investigated previously. Our objective was to validate T2* mapping ...
Tong Elizabeth E Department of Radiology, Neuroradiology Division, University of Virginia, Box 800170, Charlottesville, VA, 22908, - - 2014
Utilizing CT angiography enhances image quality in PCT, thereby permitting acquisition at ultra-low dose. Dynamic CT acquisitions were obtained at 80 kVp with decreasing tube current-time product [milliamperes × seconds (mAs)] in patients suspected of ischemic stroke, with concurrent CTA of the cervical and intracranial arteries. By utilizing fast Fourier transformation, ...
Gasiorowski Janik C JC Department of Clinical Studies, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, - - 2014
To describe clinical use of computed tomography (CT) and hoof surface markers to facilitate internal fixation within the confines of the hoof wall. Retrospective case series. Horses (n = 16) that had CT-guided internal fixation of the distal phalanx (DP) or distal sesamoid bone (DSB). Drill bit entry point and direction were ...
Eitel Charlotte C Department of Electrophysiology, University of Leipzig, Heart Center, Struempellstrasse 39, 04289, Leipzig, Germany, - - 2014
Real-time magnetic resonance imaging (MRI) combines the advantages of excellent soft-tissue characterization in a true 3D anatomical and functional model with the possibility of lesion and gap visualization without the need of any radiation. Therefore, real-time MRI presents a particularly attractive imaging technology to guide electrophysiology studies and catheter ablation ...
Leigh Richard R aDepartments of Neurology and Radiology bDepartment of Neurology and Neuroscience, Johns Hopkins University, Baltimore, Maryland, - - 2014
To summarize what is known about the use of MRI in acute stroke treatment (predominantly thrombolysis), to examine the assumptions and theories behind the interpretation of magnetic resonance images of acute ischemic stroke and how they are used to select patients for therapies, and to suggest directions for future research. ...
Evertsson Maria - - 2014
Detection and removal of sentinel lymph nodes (SLN) is important in the diagnosis and treatment of cancer. The SLN is the first regional lymph node draining the primary tumor, and if the cancer has spread, it is most likely to find metastases in the SLN. In this study, we have ...
Oh Tong In TI Impedance Imaging Research Center and Department of Biomedical Engineering, Kyung Hee University, Seoul, - - 2014
Magnetic resonance electrical impedance tomography (MREIT) is a promising non-invasive method to visualize a static cross-sectional conductivity and/or current density image by injecting low frequency currents. MREIT measures one component of the magnetic flux density caused by the injected current using a magnetic resonance (MR) scanner. For practical in vivo ...
Kolbitsch Christoph C Division of Imaging Sciences and Biomedical Engineering, King's College London, London SE1 7EH, United - - 2014
Positron emission tomography (PET) is a highly sensitive medical imaging technique commonly used to detect and assess tumor lesions. Magnetic resonance imaging (MRI) provides high resolution anatomical images with different contrasts and a range of additional information important for cancer diagnosis. Recently, simultaneous PET-MR systems have been released with the ...
Kolb A A Werner Siemens Imaging Center, Department of Preclinical Imaging and Radiopharmacy, Eberhard Karls University, 72076 Tübingen, - - 2014
The aim of this study was to develop a prototype PET detector module for a combined small animal positron emission tomography and magnetic resonance imaging (PET/MRI) system. The most important factor for small animal imaging applications is the detection sensitivity of the PET camera, which can be optimized by utilizing ...
Walton Simon S Oxford e-Research Centre, Oxford University, 7 Keble Road, Oxford, OX1 3QG, UK. Electronic address: - - 2014
Cardiovascular magnetic resonance (CMR) imaging is an essential technique for measuring regional myocardial function. However, it is a time-consuming and cognitively demanding task to interpret, identify and compare various motion characteristics based on watching CMR imagery. In this work, we focus on the problems of visualising imagery resulting from 2D ...
Yoshikawa Shushi S Central Radiology Department, Osaka Medical - - 2014
Alongside current improvements in the performance of computer tomography (CT) systems, there has been an increase in the use of bolus tracking (BT) to acquire arterial dominant phase images for dynamic CT at optimal timing for characterization of liver focal lesions. However, optimal BT settings have not been established. In ...
Gaeta Michele M Section of Radiological Sciences, Department of Biomedical Sciences and Morphologic and Functional Imaging, University of Messina, - - 2014
To investigate the value of diffusion-weighted (DW), perfusion-sensitive, and dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) techniques in assessing the response of bone metastases from breast cancer to radiotherapy, with particular emphasis on the role of intravoxel incoherent motion (IVIM)-DW parameters as a potential valuable imaging marker of tumor response. ...
Inokuchi Go G Departments of Legal Medicine, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba, 260-8670, Japan, - - 2014
One of the advantages of postmortem imaging is its ability to obtain diagnostic findings in a non-destructive manner when autopsy is either difficult or may destroy forensic evidence. In recent years, efforts have been made to incorporate computed tomography (CT) based postmortem angiography into forensic pathology; however, it is not ...
Hara Tetsuya T Massachusetts General Hospital, Harvard Medical School, Boston, - - 2014
-Accurate detection of recurrent same-site deep vein thrombosis (DVT) is a challenging clinical problem. As DVT formation and resolution are associated with a preponderance of inflammatory cells, we investigated whether noninvasive (18)F-fluorodeoxyglucose (FDG)-PET imaging could identify inflamed, recently formed thrombi and thereby improve the diagnosis of recurrent DVT. -We established ...
Xie Luke L Center for In Vivo Microscopy, Department of Radiology, Duke University Medical Center, Durham, NC, USA; Department of Biomedical Engineering, Duke University, Durham, NC, - - 2014
The major roles of filtration, metabolism and high blood flow make the kidney highly vulnerable to drug-induced toxicity and other renal injuries. A method to follow kidney function is essential for the early screening of toxicity and malformations. In this study, we acquired high spatiotemporal resolution (four dimensional) datasets of ...
Thomas M S MS Radiology Department, Norfolk & Norwich University Hospitals NHS Foundation Trust, Norwich, UK. Electronic address: - - 2014
Obtaining optimal images of small joints using magnetic resonance imaging (MRI) can be technically challenging. The aim of this review is to outline the practical aspects of MRI of small joints, with reference to the underlying physical principles. Although the most important contribution to successful imaging of small joints comes ...
Kao Yu-Chieh Jill YC Department of Neurology, University of North Carolina, Chapel Hill, NC, USA; Biomedical Research Imaging Center, University of North Carolina, Chapel Hill, NC, - - 2014
Cortical spreading depolarization (CSD) is known to exacerbate ischemic damage, as the number of CSDs correlates with the final infarct volumes and suppressing CSDs improves functional outcomes. To investigate the role of CSD in ischemic damage, we developed a novel rat model of photothrombotic ischemia using a miniature implantable optic ...
Park Sung Bin SB Department of Radiology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, - - 2014
To investigate the optimal imaging delay time of dynamic contrast-enhanced magnetic resonance (MR) imaging in women with endometrial cancer. This prospective single-institution study was approved by the institutional review board, and informed consent was obtained from the participants. Thirty-five women (mean age, 54 years; age range, 29-66 years) underwent dynamic contrast-enhanced ...
Meyers Robert W RW Cardiff School of Sport, Cardiff Metropolitan University, Cardiff, - - 2014
The purpose of this study was to examine the natural development of the mechanical features of sprint performance in relation to maturation within a large cohort of boys. Three hundred and thirty-six boys (11-15 years) were analysed for sprint performance and maturation. Maximal speed, stride length (SL), stride frequency (SF), ...
Lovesey S W SW ISIS Facility, STFC, Didcot, Oxfordshire OX11 0QX, UK. Diamond Light Source Ltd, Didcot, Oxfordshire OX11 0DE, - - 2014
A theoretical investigation of a plausible construct for electronic structure in iridate perovskites demonstrates the existence of magnetic multipoles hitherto not identified. The strange multipoles, which are parity-even, time-odd and even rank tensors, are absent from the so-called jeff = 1/2 model. We prove that the strange multipoles contribute to ...
Xiao Bo B Shanghai Children's Hospital, Shanghai Jiaotong University, Neurosurgery, Shanghai, China ; - - 2014
Our aim of this study was to quantitatively develop an early EDH natural evolutionary curve, and to assess association of the most common radiological signs of initially nonsurgical supratentorial EDHs on early CT, added with their CT time for EDH enlargement. We retrospectively reviewed pertinent data of supratentorial EDH cases ...
Golshan Mehra M Department of Surgery, Brigham and Women's Hospital and Dana-Farber Cancer Institute, Boston, MA, USA, - - 2014
The rate of reexcision in breast-conserving surgery remains high, leading to delay in initiation of adjuvant therapy, increased cost, increased complications, and negative psychological impact to the patient.1 (-) 3 We initiated a phase 1 clinical trial to determine the feasibility of the use of intraoperative magnetic resonance imaging (MRI) ...
Wille Mathilde Marie Winkler MM Department of Respiratory Medicine, Gentofte Hospital, Niels Andersensvej 65, opg. 30A, st.th., 2900, Hellerup, Denmark, - - 2014
To evaluate interobserver agreement and time-trend in chest CT assessment of emphysema, airways, and interstitial abnormalities in a lung cancer screening cohort. Visual assessment of baseline and fifth-year examination of 1990 participants was performed independently by two observers. Results were standardised by means of an electronic score sheet; kappa and ...
Burgos Ninon - - 2014
Attenuation correction is an essential requirement for quantification of Positron Emission Tomography (PET) data. In PET/CT acquisition systems, attenuation maps are derived from Computed Tomography (CT) images. However, in hybrid PET/MR scanners, Magnetic Resonance Imaging (MRI) images do not directly provide a patient-specific attenuation map. The aim of the proposed ...
Ooi Yasuhiro Y Division of Pathogenesis and Control of Oral Disease, Graduate School of Dentistry, Osaka University, Suita, Osaka 565-0871, Japan; CREST, Japan Science and Technology Agency (JST), Saitama 332-0012, Japan. Electronic address: - - 2014
Using 11.7 T ultra high-field T2-weighted MRI, the present study aimed to investigate pathological changes of primary and secondary trigeminal pathways following neonatal transection of infraorbital nerve in rats. The trigeminal pathways consist of spinal trigeminal tract, trigeminal sensory nuclear complex, medial lemniscus, ventromedial portion of external medullary lamina and ...
Brunner John J From the Department of Radiology, Emergency Radiology Section (J.B., T.C.R., A.A.C., A.S.), Department of Emergency Medicine (E.G., A.S.R.), and Department of Surgery, Division of Trauma, Burn, and Surgical Critical Care (J.M.H.), Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA - - 2014
Purpose To analyze imaging utilization and emergency radiology process turnaround times in response to the April 15, 2013, Boston Marathon bombing in order to identify opportunities for improvement in the Brigham and Women's Hospital (BWH) emergency operations plan. Materials and Methods Institutional review board approval was obtained with waivers of ...
Alani Anas A Department of Medicine, Los Angeles Biomedical Research Institute at Harbor, UCLA Medical Center, Torrance, California, - - 2014
Cardiac computed tomography (CT) has evolved at a rapid pace over the last few years. The improved spatial and temporal resolution allows collection of valuable information about the coronary arteries and atherosclerosis not obtainable by other noninvasive modalities. Coronary artery calcium acquisition is more straightforward, and large datasets are available ...
Hutchinson Michael M New York Core Neuroscience, 222 East 31st Street, New York, NY, 10016, - - 2014
Real-time MR imaging might exert a profound influence on neuroscience in the future by enabling the direct visualization of neuronal interactions. At this time, however, all practical embodiments of MRI require at least some degree of gradient encoding, and this in turn sets a lower limit of about 100 ms ...
Weavers Paul T PT Department of Radiology, MR Research Laboratory, Mayo Clinic, Rochester, Minnesota, - - 2014
To develop and validate a method for choosing the optimal two-dimensional CAIPIRINHA kernel for subtraction contrast-enhanced MR angiography (CE-MRA) and estimate the degree of image quality improvement versus that of some reference acceleration parameter set at R ≥ 8. A metric based on patient-specific coil calibration information was defined for evaluating optimality ...
Lee Young Han YH Department of Radiology, Research Institute of Radiological Science, Medical Convergence Research Institute, Yonsei University College of Medicine, Seoul, Republic of Korea; Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Republic of - - 2014
The purpose was to evaluate the diagnostic feasibility of magnetic resonance arthrography (MRA) for surgical classification of rotator cuff tear (RCT). Two-dimensional (2D)/three-dimensional (3D) MRAs of 45 patients who underwent and subsequent arthroscopy were evaluated. Full-thickness tears of supraspinatus-infraspinatus tendon were classified based on surgical categories: crescentic, U-shaped, and L-shaped. ...
Shen Guohua G Department of Nuclear Medicine, West China Hospital of Sichuan University, Chengdu, People's Republic of - - 2014
In recent years, dual-time-point (DTP) fluorine-18 fluorodeoxyglucose PET/computed tomography (CT) has emerged as a new method for evaluating metastatic lymph nodes in cancer patients. We performed this meta-analysis to evaluate the performance of DTP PET/CT compared with single-time-point (STP) imaging for differential diagnosis of lymph nodes metastases. On the basis ...
1 2 3 4 5 6 7 8 9 10 >