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Low field MRI

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https://www.readbyqxmd.com/read/28420375/silent-progression-in-patients-with-rheumatoid-arthritis-is-das28-remission-an-insufficient-goal-in-ra-results-from-the-german-remission-plus-cohort
#1
Philipp Sewerin, Stefan Vordenbaeumen, Annika Hoyer, Ralph Brinks, Christian Buchbender, Falk Miese, Christoph Schleich, Sabine Klein, Matthias Schneider, Benedikt Ostendorf
BACKGROUND: Remission is arguably the ultimate therapeutic goal in rheumatoid arthritis (RA). Applying modern strategies, clinical remission can be achieved in a substantial number of patients with early RA (ERA). Even in those patients, the number and scope of erosions can increase. We, therefore, investigated the value of MRI for the detection of radiological progression in patients with DAS28 improvement and/or clinical remission of the German Remission-plus cohort. METHODS: Data-sets of 80 RA patients (according to 2010 ACR/EULAR criteria) from the Remission-plus study cohort, who fulfilled the following criteria, were retrospectively analysed: availability of two consecutive MRI scans (low-field MRI, follow-up interval 1 year) of the clinically dominant hand and wrist, and the presence of DAS28 (CRP) scores at both time points, which was used to assess disease activity...
April 19, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28410055/olfactory-recognition-based-on-eeg-gamma-band-activity
#2
Onder Aydemir
There are various kinds of brain monitoring techniques, including local field potential, near-infrared spectroscopy, magnetic resonance imaging (MRI), positron emission tomography, functional MRI, electroencephalography (EEG), and magnetoencephalography. Among those techniques, EEG is the most widely used one due to its portability, low setup cost, and noninvasiveness. Apart from other advantages, EEG signals also help to evaluate the ability of the smelling organ. In such studies, EEG signals, which are recorded during smelling, are analyzed to determine the subject lacks any smelling ability or to measure the response of the brain...
April 14, 2017: Neural Computation
https://www.readbyqxmd.com/read/28394083/bone-volume-to-total-volume-ratio-measured-in-trabecular-bone-by-single-sided-nmr-devices
#3
Leonardo Brizi, Marco Barbieri, Fabio Baruffaldi, Villiam Bortolotti, Chiara Fersini, Huabing Liu, Marcel Nogueira d'Eurydice, Sergei Obruchkov, Fangrong Zong, Petrik Galvosas, Paola Fantazzini
PURPOSE: Reduced bone strength is associated with a loss of bone mass, usually evaluated by dual-energy X-ray absorptiometry, although it is known that the bone microstructure also affects the bone strength. Here, a method is proposed to measure (in laboratory) the bone volume-to-total volume ratio by single-sided NMR scanners, which is related to the microstructure of the trabecular bone. METHODS: Three single-sided scanners were used on animal bone samples. These low-field, mobile, low-cost devices are able to detect the NMR signal, regardless of the sample sizes, without the use of ionizing radiations, with the further advantage of signal localization offered by their intrinsic magnetic field gradients...
April 10, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28391424/optimal-radiation-therapy-for-small-cell-lung-cancer
#4
REVIEW
Michael F Gensheimer, Billy W Loo
Radiation therapy plays an important role in the management of both limited stage and extensive stage small cell lung cancer. For limited stage disease, there has been a trend toward reduced size of thoracic radiation fields, which has the potential to reduce toxicity. FDG-PET staging helps make this possible by more accurately identifying areas of nodal and metastatic involvement. Trials have demonstrated similar outcomes using a range of radiation fractionation schedules, allowing flexibility in individualizing treatment...
April 2017: Current Treatment Options in Oncology
https://www.readbyqxmd.com/read/28390805/from-transmandibular-to-transoral-robotic-approach-for-parapharyngeal-space-tumors
#5
Francesco Chu, Marta Tagliabue, Gioacchino Giugliano, Luca Calabrese, Lorenzo Preda, Mohssen Ansarin
PURPOSE: Parapharyngeal space (PPS) tumors are rare, accounting for 0.5% of all head-and-neck masses. Surgery remains the standard treatment for most cases, including different approaches (cervical approach, parotidectomy, mandibulotomy, transoral/robotic). We report our experience in the management of PPS tumors, aiming to create a surgical algorithm on the base of tumor's radiological and clinical characteristics. MATERIALS AND METHODS: Critical retrospective analysis of patients with PPS neoplasms who underwent surgery at our Institute...
March 31, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28379690/pegylated-anionic-magnetofluorescent-nanoassemblies-impact-of-their-interface-structure-on-magnetic-resonance-imaging-contrast-and-cellular-uptake
#6
Camille Linot, Julien Poly, Joanna Boucard, Daniel Pouliquen, Steven Nedellec, Philippe Hulin, Nadège Marec, Paolo Arosio, Alessandro Lascialfari, Andrea Guerrini, Claudio Sangregorio, Marc Lecouvey, Lénaïc Lartigue, Christophe Blanquart, Eléna Ishow
Controlling the interactions of functional nanostructures with water and biological media represents high challenges in the field of bioimaging applications. Large contrast at low doses, high colloidal stability in physiological conditions, the absence of cell cytotoxicity, and efficient cell internalization represent strong additional needs. To achieve such requirements, we report on high-payload magnetofluorescent architectures made of a shell of superparamagnetic iron oxide nanoparticles tightly anchored around fluorescent organic nanoparticles...
April 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28376856/the-causal-relationship-between-neurocysticercosis-infection-and-the-development-of-epilepsy-a-systematic-review
#7
REVIEW
Lucy B Gripper, Susan C Welburn
BACKGROUND: Neurocysticercosis (NCC) is a parasitic infection of the human central nervous system, the most common form of which involves infection of the brain parenchyma with the larval form of the Taenia solium tapeworm. A causal relationship between such an NCC infection and the development of epilepsy in infected individuals is acknowledged, in part supported by high levels of comorbidity in endemic countries worldwide. METHODS: This study undertook a systematic review and critical analysis of the NCC-epilepsy relationship with the primary objective of quantifying the risk of developing epilepsy following NCC infection...
April 5, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28366758/fast-single-image-super-resolution-using-estimated-low-frequency-k-space-data-in-mri
#8
Jianhua Luo, Zhiying Mou, Binjie Qin, Wanqing Li, Feng Yang, Marc Robini, Yuemin Zhu
PURPOSE: Single image super-resolution (SR) is highly desired in many fields but obtaining it is often technically limited in practice. The purpose of this study was to propose a simple, rapid and robust single image SR method in magnetic resonance (MR) imaging (MRI). METHODS: The idea is based on the mathematical formulation of the intrinsic link in k-space between a given (modulus) low-resolution (LR) image and the desired SR image. The method consists of two steps: 1) estimating the low-frequency k-space data of the desired SR image from a single LR image; 2) reconstructing the SR image using the estimated low-frequency and zero-filled high-frequency k-space data...
March 31, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28359940/oval-gradient-coils-for-an-open-magnetic-resonance-imaging-system-with-a-vertical-magnetic-field
#9
Koki Matsuzawa, Mitsushi Abe, Katsumi Kose, Yasuhiko Terada
Existing open magnetic resonance imaging (MRI) systems use biplanar gradient coils for the spatial encoding of signals. We propose using novel oval gradient coils for an open vertical-field MRI. We designed oval gradients for a 0.3T open MRI system and showed that such a system could outperform a traditional biplanar gradient system while maintaining adequate gradient homogeneity and subject accessibility. Such oval gradient coils would exhibit high efficiency, low inductance and resistance, and high switching capability...
March 20, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28359293/memory-performance-related-dynamic-brain-connectivity-indicates-pathological-burden-and-genetic-risk-for-alzheimer-s-disease
#10
Frances C Quevenco, Maria G Preti, Jiri M G van Bergen, Jun Hua, Michael Wyss, Xu Li, Simon J Schreiner, Stefanie C Steininger, Rafael Meyer, Irene B Meier, Adam M Brickman, Sandra E Leh, Anton F Gietl, Alfred Buck, Roger M Nitsch, Klaas P Pruessmann, Peter C M van Zijl, Christoph Hock, Dimitri Van De Ville, Paul G Unschuld
BACKGROUND: The incidence of Alzheimer's disease (AD) strongly relates to advanced age and progressive deposition of cerebral amyloid-beta (Aβ), hyperphosphorylated tau, and iron. The purpose of this study was to investigate the relationship between cerebral dynamic functional connectivity and variability of long-term cognitive performance in healthy, elderly subjects, allowing for local pathology and genetic risk. METHODS: Thirty seven participants (mean (SD) age 74 (6...
March 31, 2017: Alzheimer's Research & Therapy
https://www.readbyqxmd.com/read/28350351/assembly-of-iron-oxide-nanocubes-for-enhanced-cancer-hyperthermia-and-magnetic-resonance-imaging
#11
Minjung Cho, Antonio Cervadoro, Maricela R Ramirez, Cinzia Stigliano, Audrius Brazdeikis, Vicki L Colvin, Pierluigi Civera, Jaehong Key, Paolo Decuzzi
Multiple formulations of iron oxide nanoparticles (IONPs) have been proposed for enhancing contrast in magnetic resonance imaging (MRI) and for increasing efficacy in thermal ablation therapies. However, insufficient accumulation at the disease site and low magnetic performance hamper the clinical application of IONPs. Here, 20 nm iron oxide nanocubes were assembled into larger nanoconstructs externally stabilized by a serum albumin coating. The resulting assemblies of nanocubes (ANCs) had an average diameter of 100 nm and exhibited transverse relaxivity (r₂ = 678...
March 28, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28349205/prevalence-and-clinical-features-of-sports-related-lumbosacral-stress-injuries-in-the-young
#12
Hideto Kaneko, Mototsune Murakami, Kazuya Nishizawa
BACKGROUND: Stress injuries (stress fractures and stress reactions) of the lumbosacral region are one of the causes of sports-related lower back pain in young individuals. These injuries can be detected by bone marrow edema lesion on MRI. However, little is known about the prevalence and clinical features of early stage lumbosacral stress injuries. This study aimed to evaluate the epidemiology of lumbosacral stress injuries. METHODS: A total of 312 patients (under 18 years of age) who complained of sports-related lower back pain that had lasted for ≥7 days underwent magnetic resonance imaging (MRI) scans...
March 27, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28331947/-magnetic-resonance-spectroscopy-of-brain-tumors
#13
P Ditter, E Hattingen
BACKGROUND: Conventional magnetic resonance imaging (MRI) under consideration of clinical information enables the correct diagnosis and therapy for the majority of cerebral space-occupying lesions. Some important differential diagnoses, e. g. low vs. high-grade tumors, require additional MRI methods. OBJECTIVE: This article critically discusses the importance of magnetic resonance spectroscopy ((1)H-MRS) in brain tumors. MATERIAL AND METHODS: The concentration of normal and pathological brain metabolites can be non-invasively measured by (1)H-MRS...
March 22, 2017: Der Radiologe
https://www.readbyqxmd.com/read/28331888/new-concept-on-an-integrated-interior-magnetic-resonance-imaging-and-medical-linear-accelerator-system-for-radiation-therapy
#14
Xun Jia, Zhen Tian, Yan Xi, Steve B Jiang, Ge Wang
Image guidance plays a critical role in radiotherapy. Currently, cone-beam computed tomography (CBCT) is routinely used in clinics for this purpose. While this modality can provide an attenuation image for therapeutic planning, low soft-tissue contrast affects the delineation of anatomical and pathological features. Efforts have recently been devoted to several MRI linear accelerator (LINAC) projects that lead to the successful combination of a full diagnostic MRI scanner with a radiotherapy machine. We present a new concept for the development of the MRI-LINAC system...
January 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28281306/injuries-of-the-sagittal-groove-of-the-proximal-phalanx-in-warmblood-horses-detected-with-low-field-magnetic-resonance-imaging-19-cases-2007-2016
#15
Sarah J Gold, Natasha M Werpy, Santiago D Gutierrez-Nibeyro
Sagittal groove injuries of the proximal phalanx are an important cause of lameness in performance horses. The purpose of this retrospective case series study was to describe standing low-field magnetic resonance imaging (MRI) characteristics of these injuries in a group of Warmblood horses. Horses with an MRI diagnosis of sagittal groove injuries involving the proximal phalanx and that had follow-up MRI and clinical outcome information were included. Findings from clinical examinations, diagnostic tests, and other imaging modalities were recorded...
March 9, 2017: Veterinary Radiology & Ultrasound
https://www.readbyqxmd.com/read/28275348/cerebromatic-a-versatile-toolbox-for-spline-based-mri-template-creation
#16
Marko Wilke, Mekibib Altaye, Scott K Holland
Brain image spatial normalization and tissue segmentation rely on prior tissue probability maps. Appropriately selecting these tissue maps becomes particularly important when investigating "unusual" populations, such as young children or elderly subjects. When creating such priors, the disadvantage of applying more deformation must be weighed against the benefit of achieving a crisper image. We have previously suggested that statistically modeling demographic variables, instead of simply averaging images, is advantageous...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28269254/statistical-evaluation-of-manual-segmentation-of-a-diffuse-low-grade-glioma-mri-dataset
#17
Meriem Ben Abdallah, Marie Blonski, Sophie Wantz-Mezieres, Yann Gaudeau, Luc Taillandier, Jean-Marie Moureaux
Software-based manual segmentation is critical to the supervision of diffuse low-grade glioma patients and to the optimal treatment's choice. However, manual segmentation being time-consuming, it is difficult to include it in the clinical routine. An alternative to circumvent the time cost of manual segmentation could be to share the task among different practitioners, providing it can be reproduced. The goal of our work is to assess diffuse low-grade gliomas' manual segmentation's reproducibility on MRI scans, with regard to practitioners, their experience and field of expertise...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268552/passive-artifact-behavior-prediction-of-interventional-tools-in-high-field-mri-using-a-0-55t-portable-benchtop-mr-scanner
#18
H Abadi, J Krug, A Illanes, M Friebe
Using magnetic resonance imaging (MRI) for guiding minimally invasive interventions requires surgical devices which on one hand are visible in the MR image but on the other hand do not generate large artifacts, which distort the overall imaging process. Passive markers are one way to visualize devices such as catheters or biopsy needles in MRI. The evaluation of newly developed passive markers usually requires access to high-field MRI scanners (1.5 T and 3 T). This makes the practical evaluation time-consuming and expensive...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268520/multi-output-gaussian-processes-for-enhancing-resolution-of-diffusion-tensor-fields
#19
Hernan Dario Vargas Cardona, Alvaro A Orozco, Mauricio A Alvarez
Second order diffusion tensor (DT) fields are widely used in several clinical applications: brain fibers connections, diagnosis of neuro-degenerative diseases, image registration, brain conductivity models, etc. However, due to current acquisition protocols and hardware limitations in MRI machines, the diffusion magnetic resonance imaging (dMRI) data is obtained with low spatial resolution (1 or 2 mm3 for each voxel). This issue can be significant, because tissue fibers are much smaller than voxel size. Interpolation has become in a successful methodology for enhancing spatial resolution of DT fields...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267056/active-surveillance-for-low-risk-prostate-cancer
#20
Laurence Klotz
PURPOSE OF REVIEW: The approach of active surveillance for low-risk prostate cancer has evolved in many ways since its introduction 20 years ago. There is a great deal of ongoing research addressing the molecular genetics and clinical outcome of low-risk disease, the use of MRI and biomarkers, and the role of lifestyle and dietary modifications. The major developments in the field are reviewed in this article. RECENT FINDINGS: Low risk and many cases of low-intermediate risk prostate cancer are indolent, have little or no metastatic potential, and do not pose a threat to the patient in his lifetime...
May 2017: Current Opinion in Urology
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