Search Results
Results 1 - 50 of 2806
1 2 3 4 5 6 7 8 9 10 >
Naeger David M DM Department of Radiology and Biomedical Imaging, University of California, San Francisco, 505 Parnassus Avenue, M-391, Box 0628, San Francisco, CA 94143-0628, USA. Electronic address: - - 2015
PET and magnetic resonance (MR) imaging have each become essential tools in the workup and management of cardiac patients. Combined PET/MR systems have recently been developed, allowing for single-session imaging using both modalities. This new technology holds great promise for cardiac applications given the different, yet complementary, information each modality ...
Lorca Maria Clara N MC Department of Radiology and Biomedical Imaging, University of California San Francisco, 505 Parnassus Avenue, Box 0628, San Francisco, CA 94143, - - 2015
Magnetic resonance assessment of regional myocardial function is a novel potentially important tool for early identification of cardiac pathology. Many cardiac magnetic resonance techniques have been developed for detection and quantification of regional strain abnormalities including steady-state free-precession CINE, tagging, displacement encoding with stimulated echoes, strain encoding imaging, and feature ...
Mykhaylyk Olga O Institute of Experimental Oncology, Klinikum rechts der Isar der Technischen Universität München, Ismaninger Strasse 22, Munich, 81675, Germany, - - 2015
This chapter describes how to design and conduct experiments to deliver siRNA to adherent cell cultures in vitro by magnetic force-assisted transfection using self-assembled complexes of small interfering RNA (siRNA) and cationic lipids or polymers that are associated with magnetic nanoparticles (MNPs). These magnetic complexes are targeted to the cell ...
Kidoh Masafumi M Department of Diagnostic Radiology, Faculty of Life Sciences, Kumamoto University, 1-1-1, Honjo, Kumamoto 860-8556, Japan. Electronic address: - - 2015
Subtraction coronary computed tomography (CT) angiography (CCTA), which enables the removal of calcium and coronary stents from CCTA images, has been clinically introduced on a second-generation 320-row CT scanner. However, this technique for clinical use is not optimized. The long breath-holding time for two data acquisitions, which causes image misregistration ...
Iagaru Andrei A From the *Division of Nuclear Medicine and Molecular Imaging, Stanford University Medical Center; †Stanford University Medical Center, Molecular Imaging Program at Stanford (MIPS); ‡Stanford University Medical Center, Department of Radiology; §Stanford University Medical Center, Departments of Radiology, Bioengineering, Materials Science and Engineering, Molecular Imaging Program at Stanford (MIPS), Stanford, - - 2015
The recent introduction of hybrid PET/MRI scanners in clinical practice has shown promising initial results for several clinical scenarios. However, the first generation of combined PET/MRI lacks time-of-flight (TOF) technology. Here we report the results of the first patients to be scanned on a completely novel fully integrated PET/MRI scanner ...
Yamada Hiroshi H Department of Orthopedic Surgery, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama, 641-8510, Japan, - - 2014
The purposes of this study were to assess the reliability of 3-dimensional magnetic resonance (MR) imaging (3D MRI) and conventional MRI (CMRI) for detection of lumbar intra and/or extra-foraminal stenosis (LIEFS) and to compare the diagnostic accuracy of the 2 imaging modalities. A total of 60 sets of 3D MR ...
Akita Hirotaka H Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, - - 2014
Purpose: To evaluate the MRI findings of retroperitoneal low-flow vascular malformations (RLVMs) correlated with histopathological findings. Methods: Two radiologists reviewed the MRI findings of 4 RLVMs (3 with capillary malformations and 1 with a venous malformation). First, they evaluated the visibility, signal intensities, and signal homogeneity of each lesion on ...
Kanematsu Masayuki M From the Departments of Radiology (M.K., S.G., N.K., H.K., H.W., Y.N., Y.T.) and Radiology Services (M.K., T.M.), Gifu University Hospital, 1-1 Yanagido, Gifu 501-1194, Japan; and Department of Radiology, University of Pittsburgh Medical Center, Pittsburgh, Pa - - 2014
Purpose To prospectively determine the feasibility of low-iodine-load and low-tube-voltage computed tomographic (CT) angiographic imaging of the kidney and to evaluate the opacification and image quality compared with moderate-iodine-load and high-iodine-load techniques. Materials and Methods Institutional review board approval and written informed consent was obtained. One hundred thirteen consecutive patients ...
Venkatesh Sudhakar Kundapur SK Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA, - - 2014
Many diseases cause substantial changes in the mechanical properties of tissue, and this provides motivation for developing methods to noninvasively assess the stiffness of tissue using imaging technology. Magnetic resonance elastography (MRE) has emerged as a versatile MRI-based technique, based on direct visualization of propagating shear waves in the tissues. ...
Cheng Yu-Chung N YC Department of Radiology, Wayne State University, Detroit, MI 48201. Electronic address: - - 2014
The purpose of this work is to develop a method for accurately quantifying effective magnetic moments of spherical-like small objects from magnetic resonance imaging (MRI). A standard 3D gradient echo sequence with only one echo time is intended for our approach to measure the effective magnetic moment of a given ...
Schernthaner Ruediger Egbert RE Russell H. Morgan Department of Radiology and Radiological Science, Division of Vascular and Interventional Radiology, The Johns Hopkins Hospital, Sheikh Zayed Tower, Suite 7203, 1800 Orleans St, Baltimore, MD, 21287, - - 2014
To evaluate the detectability of intrahepatic cholangiocarcinoma (ICC) on dual-phase cone-beam CT (DPCBCT) during conventional transarterial chemoembolization (cTACE) compared to that of digital subtraction angiography (DSA) with respect to pre-procedure contrast-enhanced magnetic resonance imaging (CE-MRI) of the liver. This retrospective study included 17 consecutive patients (10 male, mean age 64) ...
Srinivasan Visish M VM Department of Neurosurgery, Baylor College of Medicine, Houston, Texas, - - 2014
Arteriovenous malformations (AVMs) of the brain are commonly treated in multimodality fashion, with endovascular embolization followed by surgical extirpation being one of the most effective strategies. Modern endovascular suites enable rotational angiography, also known as cone-beam CT angiography (CBCT-A), using the full capability of modern C-arm digital angiography systems. This ...
Truillet Charles C ILM, UMR 5306 - Université Claude Bernard Lyon 1, Université de Lyon, 69622, Villeurbanne Cedex, - - 2014
Nanoparticles made of a polysiloxane matrix and surrounded by 1,4,7,10-tetraazacyclododecane-1-glutaric anhydride-4,7,10-triacetic acid (DOTAGA)[Gd(3+) ] and 2,2'-(7-(1-carboxy-4-((2,5-dioxopyrrolidin-1-yl)oxy)-4-oxobutyl)-1,4,7-triazonane-1,4-diyl)diacetic acid) NODAGA[(68) Ga(3+) ] have been synthesized for positron emission tomography/magnetic resonance (PET/MRI) dual imaging. Characterizations were carried out in order to determine the nature of the ligands available for radiolabelling and to quantify ...
Wang Qingzhu Q School of Information Engineering, Northeast Dianli University, Jilin, 132012, China, - - 2015
The study aims to improve the performance of current computer-aided schemes for the detection of lung lesions, especially the low-contrast in gray density or irregular in shape. The relative position between suspected lesion and whole lung is, for the first time, added as a latent feature to enrich current Three-dimensional ...
El Fattach H H Department of Abdominal Imaging, hôpital Lariboisière, AP-HP, 2, rue Ambroise-Paré, 75010 Paris, - - 2014
Recent refinements in cross-sectional imaging have dramatically modified the investigation of the jejunum. Improvements in multidetector row computed tomography (MDCT) and magnetic resonance (MR) imaging technology have made detection and characterization of jejunal abnormalities easier. Current options include MDCT and MR imaging using either enterography or enteroclysis. The goal of ...
Watanabe Koichi K Department of Diagnostic Imaging and Nuclear Medicine, Kyoto University Graduate School of Medicine, Kyoto, - - 2014
To evaluate the ability of automated software to quantify uterine peristalsis on cine magnetic resonance imaging (MRI). At 1.5T, half-Fourier acquisition single-shot turbo spin echo (HASTE) techniques were used to obtain 60 serial images over 3 minutes (TR/TE 3000/80 msec) in a midsagittal plane of the uterus. Thirty-two cine MR ...
Kindzelski Bogdan A BA Cardiothoracic Surgery Research Program, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, - - 2014
New-generation stented bioprostheses coupled with better imaging modalities are expanding the clinical utility of transcatheter aortic valve replacement (TAVR). This study aimed at evaluating the feasibility of real-time cardiovascular magnetic resonance (rtCMR) -guided TAVR using the Medtronic Engager aortic valve system in a preclinical model. The Engager delivery device was ...
Khalifa Fahmi F BioImaging Laboratory, Department of Bioengineering, University of Louisville, Louisville, Kentucky 40292 and Electronics and Communication Engineering Department, Mansoura University, Mansoura 35516, - - 2014
To present a review of most commonly used techniques to analyze dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI), discusses their strengths and weaknesses, and outlines recent clinical applications of findings from these approaches. DCE-MRI allows for noninvasive quantitative analysis of contrast agent (CA) transient in soft tissues. Thus, it is an ...
Singer Adam A Department of Diagnostic Radiology, Jackson Memorial Hospital, Miami, FL. - - 2014
Ischiofemoral impingement is a cause of hip pain resulting from compression on the quadratus femoris muscle between the ischium and femoral lesser trochanter. The most widely accepted diagnostic criterion is hip pain with isolated edema-like signal in the ipsilateral quadratus femoris muscle on magnetic resonance imaging (MRI). Additional criteria based ...
Mandell Jason G JG Center for Neural Engineering, Department of Engineering Science and Mechanics, - - 2014
OBJECT Accurate edge tracing segmentation remains an incompletely solved problem in brain image analysis. The authors propose a novel algorithm using a particle filter to follow the boundary of the brain in the style often used in autonomous air and ground vehicle navigation. Their goals were to create a versatile ...
Potretzke Theodora A TA From the Departments of Radiology (T.A.P., C.L.B., M.G.L., L.A.S., B.J.W., F.T.L.), Biomedical Engineering (C.L.B.), and Medical Physics (C.L.B.), University of Wisconsin-Madison, E3/366 Clinical Science Center, 600 Highland Ave, Madison, WI - - 2014
Purpose To compare dual-energy computed tomography (CT) with conventional CT for the detection of small-bowel ischemia in an experimental animal model. Materials and Methods The study was approved by the animal care and use committee and was performed in accordance with the Guide for Care and Use of Laboratory Animals ...
Klatt Dieter D The Richard and Loan Hill Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois, - - 2014
To implement a multidirectional motion encoding scheme for magnetic resonance elastography (MRE) of the human brain with reduced acquisition time, and investigate its performance relative to a conventional MRE scheme. The sample interval modulation (SLIM) scheme was implemented in a multishot, variable density spiral MRE sequence. The brains of seven ...
Javadrashid Reza R Department of Radiology, Imam Reza Teaching Center, Tabriz University of Medical Sciences, Tabriz, - - 2014
Objectives: To compare the usefulness of four imaging modalities in visualizing various foreign bodies in different sizes Methods: Foreign bodies in four sizes (0.5, 1, 2 and 3 mm) including metal, tooth, wood, plastic, stone, glass and graphite were embedded in six fresh sheep' heads on bone surface between the ...
Nishizawa Mitsuo M Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan, - - 2014
Model-based iterative reconstruction (MBIR) was recently shown to enable dose reduction in computed tomography (CT). The detectability of low-contrast lesions was assessed on CT images reconstructed with MBIR compared with the conventional filtered back-projection (FBP) method. A phantom simulating brain gray matter containing small lesions mimicking early cerebral infarctions was ...
Kettenbach Joachim J Institute of Medical Radiology, Diagnostic, Intervention. Karl Landsteiner University of Health Science, University Hospital St. Poelten , St. Poelten , - - 2014
Abstract Several groups have developed robotic systems for invasive medical procedures. In this article we will focus on selected robotic systems for percutaneous needle-guided interventions using CT or MR imaging. We present six interventional robotic systems designed to work with imaging modalities such as CT, Cone-beam CT and MRI. The ...
Thomas Karen E KE Department of Diagnostic Imaging, The Hospital for Sick Children, 555 University Avenue, Toronto, M5G 1X8, Canada, - - 2014
Optimal vascular and parenchymal enhancement for multi-region paediatric body computed tomography (CT) has many challenges. A variety of approaches are currently employed, associated with varying image quality and radiation dose implications. We present a dual bolus intravenous (DBI) contrast technique for single-acquisition imaging of the chest, abdomen and pelvis, with ...
Chen Fei F State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics & Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China. - - 2014
Dual-modal lanthanide-doped gadolinium nanoparticles (NPs), which exhibit an excellent magnetic resonance imaging (MRI) spatial resolution and high fluorescence imaging (FI) sensitivity, have attracted tremendous attention in biotechnology and nanomedicine applications. In this paper, terbium (Tb) ion doped gadolinium oxide (Gd2O3:Tb) NPs with varied Tb concentrations were synthesized by a laser ...
Lavdas Eleftherios E Department of Medical Radiological Technologists, Technological Education Institute of Athens, - - 2014
To assess the efficacy of the BLADE technique (MR imaging with 'rotating blade-like k-space covering') to significantly reduce motion, truncation, flow and other artifacts in cervical spine compared to the conventional technique. In eighty consecutive subjects, who had been routinely scanned for cervical spine examination, the following pairs of sequences ...
van Atta Angela J AJ University of Utah School of Medicine, Salt Lake City, UT, - - 2014
The use of ultrasound to diagnose appendicitis in children is well-documented but not universally employed outside of pediatric academic centers, especially in the United States. Various obstacles make it difficult for institutions and radiologists to abandon a successful and accurate CT-based imaging protocol in favor of a US-based protocol. To ...
Rodriguez-Régent C C Department of Neuroradiology, INSERM UMR 894, Faculté de Médecine, Neurosciences and Psychiatry Centre, Sainte-Anne Hospital Centre, Université Paris Descartes Sorbonne Paris Cité, 1, rue Cabanis, 75014 Paris, - - 2014
Patients need to be examined for intracranial aneurysms if they have had a subarachnoid hemorrhage. The preferred technique in this situation is CT angiography. Screening can be done for familial forms or for elastic tissue disorders, for which the first line investigation is magnetic resonance angiography. These non-invasive methods have ...
Maier Oskar O Institute of Medical Informatics, University of Lübeck, Germany; Graduate School for Computing in Medicine and Live Science, University of Lübeck, Germany. Electronic address: - - 2014
To analyse the relationship between structure and (dys-)function of the brain after stroke, accurate and repeatable segmentation of the lesion area in magnetic resonance (MR) images is required. Manual delineation, the current gold standard, is time consuming and suffers from high intra- and inter-observer differences. A new approach is presented ...
Mertens Marianne E ME Dept. of Experimental Molecular Imaging, University Clinic, RWTH Aachen University, Pauwelsstrasse 30, 52074 Aachen, - - 2014
Non-invasive imaging might assist in the clinical translation of tissue-engineered vascular grafts (TEVG). It can e.g. be used to facilitate the implantation of TEVG, to longitudinally monitor their localization and function, and to provide non-invasive and quantitative feedback on their remodeling and resorption. We here incorporated ultrasmall superparamagnetic iron oxide ...
Romano Andrea A San Raffaele Foundation Rome, Rehabilitation Facility Ceglie Messapica, Merit Project RBNE08E8CZ, - - 2014
Objectives: In this preliminary report, we describe our experience with Time-Resolved Imaging of Contrast KineticS-Magnetic Resonance Angiography (TRICKS-MRA) in the assessment of Head-Neck Vascular Anomalies (HNVAs). Methods: We prospectively studied six consecutive patients with clinically suspected or diagnosed HNVAs. All of them underwent Time-resolved Imaging of contrast kinetics (TRICKS) Magnetic ...
Cieslak Matthew M Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, California, - - 2014
While simultaneous acquisition of electrocardiography (ECG) data during MRI is a widely used clinical technique, the effects of the MRI environment on impedance cardiography (ICG) data have not been characterized. We collected echo planar MRI scans while simultaneously recording ECG and thoracic impedance using carbon fiber electrodes and customized amplifiers. ...
Nakamura Tatsuya T Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871 - - 2014
(19) F magnetic resonance imaging (MRI) probes that can detect biological phenomena such as cell dynamics, ion concentrations, and enzymatic activity have attracted significant attention. Although perfluorocarbon (PFC) encapsulated nanoparticles are of interest in molecular imaging owing to their high sensitivity, activatable PFC nanoparticles have not been developed. In this ...
Londoño Ana C AC Neurological Institute of Colombia-INDEC and Link Diagnostico Digital (A.C.L.), Medellín, Colombia; and Department of Neurology (C.A.M.), Georgetown Multiple Sclerosis Center, MedStar Georgetown University Hospital, Washington, - - 2014
To date, biomarkers based on nonconventional MRI have not been standardized for diagnosis and follow-up of patients with multiple sclerosis (MS). The sequential monitoring of pathogenesis in MS by imaging of the normal appearing brain tissue is an important research tool in understanding the early stages of MS. In this ...
Tao Qian Q LKEB - Division of Image Processing, Department of Radiology, Leiden University Medical Center, Leiden, The - - 2014
To develop and validate an objective and reproducible left ventricle (LV) segmentation method for late gadolinium enhanced (LGE) magnetic resonance imaging (MRI), which can facilitate accurate myocardial scar assessment. A cohort of 25 ischemic patients and 25 nonischemic patients were included. A four-step algorithm was proposed: first, the Cine-MRI and ...
Smith Iain M IM *Royal Centre for Defence Medicine, Queen Elizabeth Hospital, Edgbaston, Birmingham, UK †202 (Midlands) Field Hospital, Roger Nutbeem House, Dawberry Fields Rd, Kings Heath, Birmingham, West Midlands, UK, and ‡NIHR Surgical Reconstruction and Microbiology Research Centre, Queen Elizabeth Hospital, Edgbaston, Birmingham, - - 2014
To determine utilization and accuracy of focused assessment with sonography for trauma (FAST) and computed tomography (CT) in a mature military trauma system to inform service provision for future conflicts. FAST and CT scans undertaken by attending radiologists contribute to surgical decision making for battlefield casualties at the Joint Force, ...
Ron A A Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel Aviv, 69978, - - 2014
Resistance as a function of temperature down to 20 mK and magnetic fields up to 18 T for various carrier concentrations is measured for nanowires made from the SrTiO_{3}/LaAlO_{3} interface using a hard mask shadow deposition technique. The narrow width of the wires (of the order of 50 nm) allows us to separate ...
Roseau Gilles G Gilles Roseau, Department of Gastroenterology, Hôpital Cochin, 75014 Paris, - - 2014
Recto-sigmoid endoscopic ultrasonography (RS-EUS) has first been used in the staging of pelvic deep infiltrating endometriosis in the early 1990's. Since then, although publications have been sparse, RS-EUS is routinely used for this indication in few centers. In this paper, we focus on technical aspects and operating method of rectal ...
Drescher Robert R Clinic of Nuclear Medicine, Jena University Hospital, Bachstraße 18, 07743, Jena, - - 2014
Positron emission tomography (PET) angiography utilizes early dynamic PET acquisitions for depiction of the arterial vasculature. The aim of this study was to assess image quality and to evaluate feasibility of F-18 FDG PET angiography of the abdominal arteries. Twenty-seven patients were included in the study. Standard activities of 250-280 MBq ...
Edmund Jens M JM Department of Oncology, Radiotherapy Research Unit, Copenhagen University Hospital, Herlev, - - 2014
Radiotherapy (RT) based on magnetic resonance imaging (MRI) as the only modality, so-called MRI-only RT, would remove the systematic registration error between MR and computed tomography (CT), and provide co-registered MRI for assessment of treatment response and adaptive RT. Electron densities, however, need to be assigned to the MRI images ...
Cervo Amedeo A Department of Advanced Biomedical Sciences, University "Federico II", Naples, - - 2014
We aimed to assess, in amyotrophic lateral sclerosis (ALS), the diagnostic accuracy of the combined use of conventional MRI signal changes (namely, hypointensity of the precentral cortex and hyperintensity of the corticospinal tracts on T2-weighted images), and N-Acetyl-Aspartate (NAA) reduction in the motor cortex at Magnetic Resonance Spectroscopy (MRS), which ...
van Schie Jeroen J N JJ Quantitative Imaging Group, Department of Imaging Physics, Delft University of Technology, The Netherlands. Electronic address: - - 2014
The Fast Spoiled Gradient Echo (FSPGR) sequence is often used in MRI to create T1-weighted images. The signal intensity generated by this sequence depends on the applied flip angle. Knowing the correct flip angle is essential for the determination of T1-maps by means of an FSPGR based Variable Flip Angle ...
Giordano Vincenzo V Serviço de Ortopedia e Traumatologia Prof. Nova Monteiro, Hospital Municipal Miguel Couto, Rio de Janeiro, RJ 22440-040, Brazil. Electronic address: - - 2014
The aim of this study was to evaluate the inter- and intra-observer agreement in the initial diagnosis and classification by means of plain radiographs and CT scans of tibial plateau fractures photographed and sent via WhatsApp Messenger. The increasing popularity of smartphones has driven the development of technology for data ...
Xu Yang - - 2014
Magnetic resonance imaging (MRI) is used extensively for clinical diagnoses. It is critical to design and develop highly efficient MR contrast agents with simple preparation procedure, low toxicity, and high biocompatibility. Here, we report a carbon quantum dot (CQDs)-stabilized gadolinium hybrid nanoprobe (Gd-CQDs) prepared via a one-pot hydrothermal treatment of ...
Tahir Bilal A BA Academic Unit of Clinical Oncology, University of Sheffield, UK. Academic Unit of Academic Radiology, University of Sheffield, - - 2014
Hyperpolarized gas magnetic resonance imaging (MRI) generates highly detailed maps of lung ventilation and physiological function while CT provides corresponding anatomical and structural information. Fusion of such complementary images enables quantitative analysis of pulmonary structure-function. However, direct image registration of hyperpolarized gas MRI to CT is problematic, particularly in lungs ...
Chan Suk-Tak ST Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging - - 2014
Abstract Primary objective: To use breath-hold functional magnetic resonance imaging (fMRI) to localize the brain regions with impaired cerebrovascular reactivity (CVR) in a female patient diagnosed with mild traumatic brain injury (mTBI). The extent of impaired CVR was evaluated 2 months after concussion. Follow-up scan was performed 1 year post-mTBI ...
Fukumitsu Nobuyoshi N Department of Radiation Oncology, Ibaraki Prefectural Central Hospital, 6528, Koibuchi, Kasama, Ibaraki, 309-1793, Japan, - - 2014
To develop an objective and less invasive method for evaluating breath-hold status, and to investigate breath-hold reproducibility during voluntary breath-holding irradiation. We enrolled 20 patients who were treated using a voluntary breath-holding technique. Four or five sessions of cone beam computed tomography (CT) were performed during the radiotherapy session. An ...
Boros Eszter E Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129, USA. - - 2014
This perspective outlines strategies towards the development of MR imaging probes that our lab has explored over the last 15 years. Namely, we discuss methods to enhance the signal generating capacity of MR probes and how to achieve tissue specificity through protein targeting or probe activation within the tissue microenvironment.
1 2 3 4 5 6 7 8 9 10 >