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Results 101 - 150 of 909
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Yahya Atiyah - - 2011
PURPOSE: To demonstrate, at 9.4 T, that J-coupling interactions exhibited by lipid protons affects lipid composition determination with a point resolved spectroscopy (PRESS) sequence. MATERIALS AND METHODS: Experiments were conducted on four oils (almond, corn, sesame, and sunflower), on visceral adipose tissue of a euthanized mouse, and on pure linoleic ...
Owens Gabe E - - 2011
The authors have demonstrated that histotripsy (pulsed cavitational ultrasound) can create atrial septal defects and ventricular septal defects (VSDs) in an open-chest canine model transcutaneously through the intact chest of neonatal pigs. To assess the potential untoward effects of these applications, the clinical, systemic, and pathologic effects of histotripsy-induced intracardiac ...
Bae Ji-Eun - - 2011
Biomedical applications of magnetic nanoparticles (MNP), including superparamagnetic nanoparticles, have expanded dramatically in recent years. Systematic and standardized cytotoxicity assessment to ensure the biosafety and biocompatibility of those applications is compulsory. We investigated whether exposure to static magnetic field (SMF) from e.g. magnetic resonance imaging (MRI) could affect the cytotoxicity ...
Xing Yan - - 2012
As melanoma survival rates continue to increase, optimal surveillance strategies for recurrences are needed, as are effective imaging modalities. Therefore, we performed a meta-analysis to evaluate the current state of imaging modalities for surveillance of melanoma in the published medical literature to determine the sensitivity, specificity, and positive predictive values ...
Holmes M W MW School of Health and Related Research, The University of Sheffield, United Kingdom. - - 2012
To estimate the cost-effectiveness of diagnostic management strategies for adults with minor head injury. A mathematical model was constructed to evaluate the incremental costs and effectiveness (Quality Adjusted Life years Gained, QALYs) of ten diagnostic management strategies for adults with minor head injuries. Secondary analyses were undertaken to determine the ...
Vanness David J - - 2011
To estimate the cost-effectiveness of computed tomographic (CT) colonography for colorectal cancer (CRC) screening in average-risk asymptomatic subjects in the United States aged 50 years. Enrollees in the American College of Radiology Imaging Network National CT Colonography Trial provided informed consent, and approval was obtained from the institutional review board ...
Shemesh Noam - - 2011
Double-Pulsed-Field-Gradient (d-PFG) MR is emerging as a powerful new means for obtaining unique microstructural information in opaque porous systems that cannot be obtained by conventional single-PFG (s-PFG) methods. The angular d-PFG MR methodology is particularly important since it can utilize the effects of microscopic anisotropy (μA) and compartment shape anisotropy ...
Shcherbinin S - - 2011
We investigated the severity of partial volume effects (PVE), which may occur in SPECT/CT studies, and the performance of two template-based correction techniques. A hybrid SPECT/CT system was used to scan a thorax phantom that included lungs, a heart insert and six cylindrical containers of different sizes and activity concentrations. ...
Heinrich Angela - - 2011
To evaluate whether cognitive processes, sensory perception, and vital signs might be influenced by static magnetic fields in magnetic resonance imaging (MRI), which could pose a risk for health personnel and patients, we conducted a meta-analysis of studies that examined effects of static magnetic fields. Studies covering the time from ...
Dunne Peter - - 2011
Metal electrodeposition reflects the pattern of the magnetic field at the cathode surface created by a magnet array. For deposits from paramagnetic cations such as Co²⁺ or Cu²⁺, the effect is explained in terms of magnetic pressure which modifies the thickness of the diffusion layer, that governs their mass transport. ...
Krausz Yodphat - - 2011
Recent data have indicated that (68)Ga-DOTA-NOC positron emission tomography/X-ray computed tomography (PET/CT) may yield improved images in a shorter acquisition protocol than (111)In-DTPA-octreotide (OctreoScan®, OCT). Therefore, we performed a prospective comparison of (68)Ga-DOTA-NOC and OCT for the detection of neuroendocrine tumors (NETs). Nineteen patients (eight carcinoid, nine pancreatic NETs, and ...
Habib Fatemah - - 2011
Dilution method was employed for the elucidation of the slow relaxation of the magnetization in a Dy2 SMM. The dominant single ion relaxation is entangled with the neighboring DyIII ion relaxation within the molecule, which in turns greatly influences the quantum tunneling of the magnetization seen in this molecule.
Sarangi S - - 2011
We have investigated and modeled the effect of interaction among magnetic particles and the magnitude and duration of external applied magnetic field on Brownian relaxation in a colloidal suspension. In the case of interacting magnetic particles, Brownian relaxation depends on the interparticle dipole-dipole interaction, which slows down the overall Brownian ...
Train Cyrille - - 2011
In this critical review, it is shown how the introduction of chirality and the control of the absolute configurations of chiral elements in molecular magnets allow obtaining enantiopure chiral magnets (ECM), an archetype of multifunctional materials. This task has been recognised as a major challenge for both chemists and physicists ...
Narvid J - - 2011
The diagnosis of intracranial DAVF with noninvasive cross-sectional imaging such as CTA is challenging. We sought to determine the sensitivity and specificity of CTA compared with cerebral angiography for DAVF in patients presenting with PT. Following approval of the institutional review board, we reviewed all patients who underwent CTA for ...
Bellani M - - 2011
Here, we briefly summarize the most consistent structural magnetic resonance imaging (MRI) studies on amygdala in major depression and debate the effects of clinical variables on amygdalar morphology.
Jiang Zi Yang - - 2011
OBJECTIVE:: To determine if neurotologists order magnetic resonance imaging (MRI) in cases of idiopathic sudden sensorineural hearing loss (sudden deafness) and of asymmetric sensorineural hearing loss (ASNHL) for medicolegal reasons. STUDY DESIGN:: Survey of 480 American neurotologists. MAIN OUTCOME MEASURES:: 1) The frequency with which neurotologists/otologists in the United States ...
Burton Emma J EJ Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle upon Tyne, UK. - - 2012
The objective of this study was to determine the neuropathological correlates of regional medial temporal lobe volume measures on magnetic resonance imaging (MRI) in subjects with Lewy body dementia (LBD). Twenty-three autopsy-confirmed LBD cases with an MRI scan close to death (mean 1.5 years) were studied. MRI-based volumetric measures were ...
Dechambenoit Pierre - - 2011
Combining porosity and magnetic ordering in a single material presents a significant challenge since magnetic exchange generally requires short bridges between the spin carriers, whereas porosity usually relies on the use of long diamagnetic connecting ligands. Despite this apparent incompatibility, notable successes have been achieved of late in generating truly ...
Konstantopoulos Aristides - - 2011
To quantify the human corneal inflammatory response in treated bacterial keratitis with long-wavelength anterior segment optical coherence tomography (AS-OCT). Patients with clinically suspected bacterial keratitis were recruited from the corneal service at Southampton Eye Unit, UK. Patients underwent AS-OCT and slit-lamp examination on presentation (day 0) and days 3, 7, ...
Larkin Ann M - - 2011
Purpose. We quantify the additional radiation exposure in terms of effective dose incurred by patients in the CT portion of SPECT/CT examinations. Methods. The effective dose from a variety of common nuclear medicine procedures is calculated and summarized. The extra exposure from the CT portion of the examination is summarized ...
Schmitz-Valckenberg Steffen - - 2011
To analyze outer retinal changes within the atrophic lesion in patients with geographic atrophy (GA) secondary to age-related macular degeneration. Twenty-one simultaneously obtained fundus autofluorescence (FAF, excitation, 488 nm; emission, 500-700 nm) and spectral-domain optical coherence tomography (SD-OCT) scans (Spectralis HRA+OCT; Heidelberg Engineering, Heidelberg, Germany) of 21 GA patients (mean ...
Iida Hiroji - - 2011
The general method of measuring the half-value layer (HVL) for X-ray computed tomography (CT) using square aluminum-sheet filters is inconvenient in that the X-ray tube has to be set to stationary mode. To avoid this inconvenience, we investigated a new method using copper-pipe filters that cover the ionization chamber (copper-pipe ...
Saranu Srinivasa - - 2011
Magnetic nanoparticles are promising candidates for next generation high density magnetic data storage devices. Data storage requires precise control of the magnetic properties of materials, in which the magnetic anisotropy plays a dominant role. Since the total magneto-crystalline anisotropy energy scales with the particle volume, the storage density in media ...
Zuo Xi-Nian - - 2011
Neuroimaging community usually employs spatial smoothing to denoise magnetic resonance imaging (MRI) data, e.g., Gaussian smoothing kernels. Such an isotropic diffusion (ISD) based smoothing is widely adopted for denoising purpose due to its easy implementation and efficient computation. Beyond these advantages, Gaussian smoothing kernels tend to blur the edges, curvature ...
Zhang Yi Y University of TexasHealth Science Center, San Antonio, TX, - - 2011
To demonstrate blood oxygenation level-dependent (BOLD) magnetic resonance imaging (MRI) of vascular oxygenation changes in normal, unanesthetized human retinas associated with oxygen and carbogen challenge. MRI was performed with a 3-T human scanner and a custom-made surface-coil detector on normal volunteers. BOLD MRI with inversion recovery was used to suppress ...
Callahan Jason J Peter MacCallum Cancer Centre, Centre for Molecular Imaging, St Andrews Place, East Melbourne, Victoria, Australia. - - 2011
Lesion movement during positron emission tomography (PET) scan acquisition due to normal respiration is a common source of artefact. A PET scan is acquired in multiple couch positions of between 2 and 5 min duration with the patient breathing freely. A PET-avid lesion will become blurred if affected by respiratory ...
Byrne A J AJ Oriflame Research and Development Ltd, Bray Business Park, Kilruddery, Bray, Co. Wicklow, - - 2010
Dry skin (also known as xerosis) is a cutaneous reaction pattern indicative of abnormal desquamation, which has not only cosmetic considerations, but can also lead to the penetration of irritants and allergens through the stratum corneum (SC). Over the last few decades, our understanding of the structure, composition, formation and ...
Benavente-Pérez Alexandra - - 2010
To evaluate the repeatability and reproducibility of subfoveal choroidal thickness (CT) calculations performed manually using optical coherence tomography (OCT). The CT was imaged in vivo at each of two visits on 11 healthy volunteers (mean age, 35.72 ± 13.19 years) using the spectral domain OCT. CT was manually measured after ...
Saikia Parykshit - - 2010
To describe a presentation of painless posterior scleritis. This study was an interventional case report. An 18-year-old boy was admitted to the authors' clinic with symptoms of low degree of vision and no ocular pain. Ophthalmologic examination, ocular ultrasonography, magnetic resonance imaging, fundus fluorescein angiography (FFA), optical coherence tomography (OCT), ...
Ichhpujani Parul - - 2010
The iStent (Glaukos Corporation, Laguna Hills, CA) is a 1-mm, titanium trabecular bypass stent implanted across the inner wall of Schlemm's canal under direct gonioscopy. This study was designed to determine the best modality to identify iStent placement when gonioscopic visualization is not possible. In this in vitro study on ...
Moon Sucbei S Beckman Laser Institute, University of California, Irvine, Irvine, CA 92612, - - 2010
A forward-view optical coherence tomography (OCT) scanning catheter has been developed based on a fiber-cantilever piezotube scanner by using a semi-resonant scan strategy for a better scan performance. A compact endoscope catheter was fabricated by using a tubular piezoelectric actuator with quartered electrodes in combination with a resonant fiber cantilever. ...
Basiruddin S K - - 2010
A magnetic quantum dot (MQD) based cellular nanoprobe, composed of a magnetic oxide nanoparticle component and a quantum dot component, has been synthesized and used for both imaging and separation. The successful synthesis is based on a reverse micelle based polyacrylate coating in the presence of component nanoparticles, followed by ...
Lim Eun-Kyung - - 2010
We fabricated multimode nanoprobes for acquisition of biological information at different object levels, i.e., in vivo detection and ex vivo validation for characterizing tumor angiogenesis. Fluorescent magnetic nanoprobes (FMNPs) were synthesized by using amphiphilic pyrenyl polyethylene glycol (Py-PEG) and superparamagnetic MnFe(2)O(4) nanocrystals (MNCs). Py-PEG, which is synthesized by conjugation of ...
Nair Govind G Graduate School of Biomedical Science, University of Massachusetts Medical School, Worcester, MA, - - 2011
The retina is nourished by two unique (retinal and choroidal) circulations. The lack of depth-resolved blood volume (BV) imaging techniques hampers investigation of vascular-specific regulation of the retina in vivo. This study presents a high-resolution, laminar-specific magnetic resonance imaging (MRI) study to image retinal and choroidal BVs, their responses to ...
Kim Hoe Suk - - 2010
A combination of reporter genes for magnetic resonance imaging (MRI) and optical imaging can provide an additional level of noninvasive and quantitative information about biological processes occurring in deep tissues. We developed a bimodal lentiviral vector to monitor deep tissue events using MRI to detect myc-tagged human ferritin heavy chain ...
Kiilgaard Jens Folke - - 2011
Background:  Intraocular silicone oil may migrate into the optic nerve or the cerebral ventricles, but little is known about the frequency of these events. The aim of this prospective neuroimaging study was to determine the frequency of extraocular silicone oil migration in humans operated for retinal detachment. Methods:  Nineteen patients ...
Jańczewski Dominik - - 2011
Fluorescent optical probes have been intensively used in the area of bio-imaging. In this review article, we describe the recent advancements in the synthesis and application of bimodal magnetic-fluorescent probes for bioimaging. The bimodal probes consist of fluorescent [semiconducting quantum dots (e.g., CdSe/ZnS) or rare-earth doped (e.g., NaYF(4) :Yb,Er)] nanoparticles ...
Howes Philip - - 2010
Hybrid nanoparticles which incorporate multiple functionalities, such as fluorescence and magnetism, can exhibit enhanced efficiency and versatility by performing several tasks in parallel. In this study, magnetic-fluorescent semiconductor polymer nanospheres (MF-SPNs) have been synthesized by encapsulation of hydrophobic conjugated polymers and iron oxide nanoparticles in phospholipid micelles. Four fluorescent conjugated ...
Tseng Hung-Yu - - 2010
Preparation of a high-concentration Au nanoring (NR) water solution and its applications to the enhancement of image contrast in optical coherence tomography (OCT) and the generation of the photothermal effect in a bio-sample through localized surface plasmon (LSP) resonance are demonstrated. Au NRs are first fabricated on a sapphire substrate ...
Gros Stephanie J - - 2010
We describe the development of an aggressive orthotopic metastatic model of esophageal cancer, which is visualized in real time with combined magnetic resonance imaging (MRI) and fluorescence imaging. The aim of the study was to describe the development of a novel model of metastatic tumor disease of esophageal carcinoma and ...
Wan Jiaqi - - 2010
Bifunctional nanoprobes with both magnetic and optical contrast have been developed for ultra-sensitive brain tumor imaging at the cellular level. The nanoprobes were synthesized by simultaneously incorporating a magnetite nanoparticle cluster and fluorescence dyes into silica encapsulation by a sol-gel approach under ultrasonic treatment. The nanoprobes maintain superparamagnetic behavior at ...
You Youngmin Y Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, - - 2010
A paramagnetic manganese complex of a fluorescein-based probe affords a dual-modality zinc sensor featuring an improved fluorescence dynamic range and an MRI readout.
Khurana Rahul N - - 2010
PURPOSE: To compare fluorescein leakage from choroidal neovascularization (CNV) with signs of intraretinal or subretinal fluid on time-domain optical coherence tomography (TD-OCT) and spectral-domain optical coherence tomography (SD-OCT) in patients receiving anti-vascular endothelial growth factor (anti-VEGF) therapy for CNV caused by age-related macular degeneration (AMD). DESIGN: Retrospective, consecutive case series. ...
Tanitame Keizo - - 2010
PURPOSE: To compare a half-Fourier single-shot rapid acquisition with relaxation enhancement (RARE) sequence with a balanced steady-state free precession (b-SSFP) sequence in the evaluation of the eye using magnetic resonance (MR) microscopy imaging and to clarify the usefulness of RARE microscopy imaging in evaluating nonoperative glaucoma patients and patients who ...
Li Yan Y Center for Ophthalmic Optics and Lasers, Doheny Eye Institute and Department of Ophthalmology, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, - - 2010
To evaluate the repeatability of Fourier-domain optical coherence tomography (OCT) pachymetric mapping and compare central corneal thickness (CCT) measurements by OCT, ultrasound pachymetry, and scanning-slit tomography. Doheny Eye Institute, University of Southern California, Los Angeles, California, USA. A Fourier-domain OCT system was used to map the corneal thickness in normal ...
John Renu R Department of Bioengineering, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, - - 2010
Dynamic magnetomotion of magnetic nanoparticles (MNPs) detected with magnetomotive optical coherence tomography (MM-OCT) represents a new methodology for contrast enhancement and therapeutic interventions in molecular imaging. In this study, we demonstrate in vivo imaging of dynamic functionalized iron oxide MNPs using MM-OCT in a preclinical mammary tumor model. Using targeted ...
Guo Kevin K Department of Radiology, Washington University, St. Louis, MO 63110, - - 2010
A new gadolinium chelating NIR fluorescent molecular probe increases T(1) relaxivity of water protons, facilitating combined optical and magnetic resonance imaging.
Roberts David W - - 2011
The aim of this study was to investigate the relationships between intraoperative fluorescence, features on MR imaging, and neuropathological parameters in 11 cases of newly diagnosed glioblastoma multiforme (GBM) treated using protoporphyrin IX (PpIX) fluorescence-guided resection. In 11 patients with a newly diagnosed GBM, δ-aminolevulinic acid (ALA) was administered to ...
Bear David M - - 2010
Optical coherence tomography (OCT) and T2 mapping are emerging clinical imaging technologies with potential to detect subsurface changes in cartilage retaining a macroscopically intact articular surface. This study tests the hypothesis that OCT correlates with magnetic resonance imaging (MRI) T2 values, and that OCT signal is sensitive to cartilage matrix ...
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