keyword
MENU ▼
Read by QxMD icon Read
search

Synthetic mri

keyword
https://www.readbyqxmd.com/read/28516232/-cns-metabolism-in-high-risk-drug-abuse-german-version-insights-gained-from-1-h-and-31-p-mrs-and-pet
#1
REVIEW
S V Bodea
BACKGROUND: High-risk drug consumption is a considerable problem for public health actors in industrialised countries. The latest trends show a market tendency towards diversification and increasing demand for high-purity synthetic drugs. Whilst most consumers seek medical help after cannabis use, it is high-risk drugs like cocaine, heroin and amphetamines that account for most of the 1000 drug-related deaths that occur in Germany every year. PURPOSE: This article presents the most prominent in vivo cerebral metabolic information in cocaine, heroin and methamphetamine users provided by MRI spectroscopy and PET imaging...
May 17, 2017: Der Radiologe
https://www.readbyqxmd.com/read/28513139/one-step-facile-synthesis-of-highly-magnetic-and-surface-functionalized-iron-oxide-nanorods-for-biomarker-targeted-applications
#2
Anamaria Ioana Orza, Hui Wu, Yaolin Xu, Qiong Lu, Hui Mao
We report a one-step method for facile and sustainable synthesis of magnetic iron oxide nanorods (or IONRs) with the mean lengths ranging from 25 to 50 nm and mean diameters ranging from 5 to 8 nm. The prepared IONRs are highly stable in aqueous media and can be surface functionalized for biomarker targeted applications. This synthetic strategy involves the reaction of iron(III) acetylacetonate with polyethyleneimine in the presence of oleylamine and phenylether, followed by thermal decomposition. Importantly, the length and diameter as well as the aspect ratio of prepared IONRs can be controlled by modulating the reaction parameters...
May 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28508160/operative-simulation-of-anterior-clinoidectomy-using-a-rapid-prototyping-model-molded-by-a-three-dimensional-printer
#3
Shinichi Okonogi, Kosuke Kondo, Naoyuki Harada, Hiroyuki Masuda, Masaaki Nemoto, Nobuo Sugo
BACKGROUND: As the anatomical three-dimensional (3D) positional relationship around the anterior clinoid process (ACP) is complex, experience of many surgeries is necessary to understand anterior clinoidectomy (AC). We prepared a 3D synthetic image from computed tomographic angiography (CTA) and magnetic resonance imaging (MRI) data and a rapid prototyping (RP) model from the imaging data using a 3D printer. The objective of this study was to evaluate anatomical reproduction of the 3D synthetic image and intraosseous region after AC in the RP model...
May 15, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28507969/core-decompression-with-synthetic-grafting-as-a-joint-preservation-strategy-in-humeral-avascular-necrosis-due-to-sickle-cell-anemia-a-case-report
#4
Andrew M Steffensmeier, Karen Kirkham, John M Wiemann
INTRODUCTION: Avascular necrosis (AVN) of the femoral or humeral heads in patients with sickle cell anemia is a common and painful condition. There is currently no gold standard treatment protocol for this condition. Typically, the pain is managed with narcotics and activity restriction until there has been collapse of the subchondral bone with a degree of arthrosis sufficient to warrant total joint arthroplasty. This method entails prolonged pain for the patient and decreases the ability to function occupationally and recreationally...
November 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28498564/spatial-bayesian-latent-factor-regression-modeling-of-coordinate-based-meta-analysis-data
#5
Silvia Montagna, Tor Wager, Lisa Feldman Barrett, Timothy D Johnson, Thomas E Nichols
Now over 20 years old, functional MRI (fMRI) has a large and growing literature that is best synthesised with meta-analytic tools. As most authors do not share image data, only the peak activation coordinates (foci) reported in the article are available for Coordinate-Based Meta-Analysis (CBMA). Neuroimaging meta-analysis is used to (i) identify areas of consistent activation; and (ii) build a predictive model of task type or cognitive process for new studies (reverse inference). To simultaneously address these aims, we propose a Bayesian point process hierarchical model for CBMA...
May 12, 2017: Biometrics
https://www.readbyqxmd.com/read/28491877/nodular-regenerative-hyperplasia-a-case-of-rare-prognosis
#6
Mindy Lee, Manhal Izzy, Ashwin Akki, Kathryn Tanaka, Harmit Kalia
Introduction: Nodular regenerative hyperplasia (NRH) is a known etiology of noncirrhotic portal hypertension. Cases of biopsy-proven NRH in human immunodeficiency virus (HIV)-positive patients have been described. While these patients often have normal synthetic liver function, several reports described disease progression to liver failure. Case: We here present a 26-year-old woman with history of congenital HIV on antiretroviral therapy complicated by Pneumocystis carinii pneumonia at age 14. CD4 counts have been >300 with undetectable viral load...
January 2017: Journal of Investigative Medicine High Impact Case Reports
https://www.readbyqxmd.com/read/28481045/pre-and-postoperative-magnetic-resonance-imaging-mri-findings-in-patients-treated-with-laparoscopic-sacrocolpopexy-is-it-a-safe-procedure-for-all-patients
#7
Dimitrios Zacharakis, Themos Grigoriadis, Charis Bourgioti, Eleni Pitsouni, Athanasios Protopapas, Lia A Moulopoulos, Stavros Athanasiou
INTRODUCTION: Laparoscopic sacrocolpopexy (LSCP) is a reference operation for apical compartment prolapse repair. Aim of this study is to describe the early and midterm postoperative MRI findings of the lumbosacral region (LSR) in patients undergoing LSCP and to detect any imaging changes that the presence of the mesh may cause on patients with preexisting degenerative disease of the LSR. METHODS: Patients with POP-Q grade III and IV uterovaginal or vaginal vault prolapse who were considered eligible for LSCP were invited to participate...
May 8, 2017: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/28463189/basis-expansions-approaches-for-regularized-sequential-dictionary-learning-algorithms-with-enforced-sparsity-for-fmri-data-analysis
#8
Abd-Krim Seghouane, Asif Iqbal
Sequential dictionary learning algorithms have been successfully applied to functional magnetic resonance imaging (fMRI) data analysis. fMRI datasets are however structured data matrices with notions of temporal smoothness in the column direction. This prior information which can be converted to a constraint of smoothness on the learned dictionary atoms has seldomly been included in classical dictionary learning algorithms when applied to fMRI data analysis. In this paper we tackle this problem by proposing two new sequential dictionary learning algorithms dedicated to fMRI data analysis by accounting for this prior information...
April 28, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28456167/persistent-homology-of-time-dependent-functional-networks-constructed-from-coupled-time-series
#9
Bernadette J Stolz, Heather A Harrington, Mason A Porter
We use topological data analysis to study "functional networks" that we construct from time-series data from both experimental and synthetic sources. We use persistent homology with a weight rank clique filtration to gain insights into these functional networks, and we use persistence landscapes to interpret our results. Our first example uses time-series output from networks of coupled Kuramoto oscillators. Our second example consists of biological data in the form of functional magnetic resonance imaging data that were acquired from human subjects during a simple motor-learning task in which subjects were monitored for three days during a five-day period...
April 2017: Chaos
https://www.readbyqxmd.com/read/28453929/synthesis-of-lipophilic-core-shell-fe3o4-sio2-au-nanoparticles-and-polymeric-entrapment-into-nanomicelles-a-novel-nanosystem-for-in-vivo-active-targeting-and-magnetic-resonance-photoacoustic-dual-imaging
#10
Ilaria Monaco, Francesca Arena, Stefania Biffi, Erica Locatelli, Barbara Bortot, Francesca La Cava, Giada Maria Marini, Giovanni Maria Severini, Enzo Terreno, Mauro Comes Franchini
In this work, iron/silica/gold core-shell nanoparticles (Fe3O4@SiO2@Au NPs) characterized by magnetic and optical properties have been synthesized to obtain a promising theranostic platform. To improve their biocompatibility, the obtained multilayer nanoparticles have been entrapped in polymeric micelles, decorated with folic acid moieties, and tested in vivo for photoacoustic and magnetic resonance imaging detection of ovarian cancer.
May 17, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28450707/post-surgery-glioma-growth-modeling-from-magnetic-resonance-images-for-patients-with-treatment
#11
Ahmed Elazab, Hongmin Bai, Yousry M Abdulazeem, Talaat Abdelhamid, Sijie Zhou, Kelvin K L Wong, Qingmao Hu
Reaction diffusion is the most common growth modelling methodology due to its simplicity and consistency with the biological tumor growth process. However, current extensions of the reaction diffusion model lack one or more of the following: efficient inclusion of treatments' effects, taking into account the viscoelasticity of brain tissues, and guaranteed stability of the numerical solution. We propose a new model to overcome the aforementioned drawbacks. Guided by directional information derived from diffusion tensor imaging, our model relates tissue heterogeneity with the absorption of the chemotherapy, adopts the linear-quadratic term to simulate the radiotherapy effect, employs Maxwell-Weichert model to incorporate brain viscoelasticity, and ensures the stability of the numerical solution...
April 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28450439/synthetic-mri-for-clinical-neuroimaging-results-of-the-magnetic-resonance-image-compilation-magic-prospective-multicenter-multireader-trial
#12
L N Tanenbaum, A J Tsiouris, A N Johnson, T P Naidich, M C DeLano, E R Melhem, P Quarterman, S X Parameswaran, A Shankaranarayanan, M Goyen, A S Field
BACKGROUND AND PURPOSE: Synthetic MR imaging enables reconstruction of various image contrasts from 1 scan, reducing scan times and potentially providing novel information. This study is the first large, prospective comparison of synthetic-versus-conventional MR imaging for routine neuroimaging. MATERIALS AND METHODS: A prospective multireader, multicase noninferiority trial of 1526 images read by 7 blinded neuroradiologists was performed with prospectively acquired synthetic and conventional brain MR imaging case-control pairs from 109 subjects (mean, 53...
April 27, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28444772/multi-atlas-approach-with-local-registration-goodness-weighting-for-mri-based-electron-density-mapping-of-head-and-neck-anatomy
#13
Reza Farjam, Neelam Tyagi, Harini Veeraraghavan, Aditya Apte, Kristen Zakian, Margie A Hunt, Joseph O Deasy
PURPOSE: The growing use of magnetic resonance imaging (MRI) as a substitute for computed tomography-based treatment planning requires the development of effective algorithms to generate electron density maps for treatment planning and patient setup verification. The purpose of this work was to develop a method to synthesize computerized tomography (CT) for MR-only radiotherapy of head and neck cancer patients. METHODS: The algorithm is based on registration of multiple patient datasets containing both MRI and CT images (a "multi-atlas" algorithm)...
April 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28437932/electrifying-catheters-with-light
#14
Martin Pekař, Jeannet van Rens, Martin B van der Mark
Smart minimally invasive devices face a connectivity challenge. An example is found in intracardiac echocardiography where the signal transmission and supply of power at the distal end require many thin and fragile wires in order to keep the catheter slim and flexible. We have built a fully functional bench-top prototype to demonstrate that electrical wires may be replaced by optical fibers. The prototype is immediately scalable to catheter dimensions. The absence of conductors will provide intrinsic galvanic isolation as well as radio frequency (RF) and magnetic resonance imaging (MRI) compatibility...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28436460/histological-validation-of-fast-macromolecular-proton-fraction-mapping-as-a-quantitative-myelin-imaging-method-in-the-cuprizone-demyelination-model
#15
Marina Yu Khodanovich, Irina V Sorokina, Valentina Yu Glazacheva, Andrey E Akulov, Nikolay M Nemirovich-Danchenko, Alexander V Romashchenko, Tatyana G Tolstikova, Lilia R Mustafina, Vasily L Yarnykh
Cuprizone-induced demyelination in mice is a frequently used model in preclinical multiple sclerosis research. A recent quantitative clinically-targeted MRI method, fast macromolecular proton fraction (MPF) mapping demonstrated a promise as a myelin biomarker in human and animal studies with a particular advantage of sensitivity to both white matter (WM) and gray matter (GM) demyelination. This study aimed to histologically validate the capability of MPF mapping to quantify myelin loss in brain tissues using the cuprizone demyelination model...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28433979/lethal-high-acute-disseminated-encephalomyelitis-adem-triggered-by-toxic-effect-of-synthetic-cannabinoid-black-mamba
#16
Kiran Samra, Ian S Boon, Gregory Packer, Saiju Jacob
A previously well 25-year-old man presented with agitation, double incontinence and left-sided incoordination. His symptoms started after smoking a synthetic cannabinoid (black mamba) 5 days earlier. Over 48 hours, he developed aphasia, generalised hypertonia, hyper-reflexia and dense left hemiparesis. This progressed to profuse diaphoresis, fever, tachycardia, hypertension and a possible seizure necessitating admission to the intensive care unit. CT head and cerebrospinal fluid analysis were unremarkable...
April 22, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28424605/white-matter-integrity-and-treatment-based-change-in-speech-performance-in-minimally-verbal-children-with-autism-spectrum-disorder
#17
Karen Chenausky, Julius Kernbach, Andrea Norton, Gottfried Schlaug
We investigated the relationship between imaging variables for two language/speech-motor tracts and speech fluency variables in 10 minimally verbal (MV) children with autism. Specifically, we tested whether measures of white matter integrity-fractional anisotropy (FA) of the arcuate fasciculus (AF) and frontal aslant tract (FAT)-were related to change in percent syllable-initial consonants correct, percent items responded to, and percent syllable insertion errors (from best baseline to post 25 treatment sessions)...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28391596/technical-note-is-bulk-electron-density-assignment-appropriate-for-mri-only-based-treatment-planning-for-lung-cancer
#18
Phil Prior, Xinfeng Chen, Elizabeth Gore, Candice Johnstone, X Allen Li
PURPOSE: MRI-based treatment planning in radiation therapy (RT) is prohibitive, in part, due to the lack of electron density (ED) information within the image. The dosimetric differences between MRI- and CT-based planning for intensity modulated RT (IMRT) of lung cancer were investigated to assess the appropriateness of bulk ED assignment. METHODS: Planning CTs acquired for six representative lung cancer patients were used to generate bulk ED IMRT plans. To avoid the effect of anatomic differences between CT and MRI, "simulated MRI-based plans" were generated by forcing the relative ED (rED) to water on CT-delineated structures using organ specific values from the ICRU Report 46 and using the mean rED value of the internal target volume (ITV) from the planning CT...
April 9, 2017: Medical Physics
https://www.readbyqxmd.com/read/28385584/a-study-of-the-clinical-utility-of-a-20-minute-secretin-stimulated-endoscopic-pancreas-function-test-and-performance-according-to-clinical-variables
#19
Luis F Lara, Morihito Takita, James S Burdick, Daniel C DeMarco, Ronnie R Pimentel, Tolga Erim, Marlon F Levy
BACKGROUND AND AIMS: Direct pancreas juice testing of bicarbonate, lipase, or trypsin after stimulation by secretin or cholecystokinin is used to determine exocrine function, a surrogate for diagnosing chronic pancreatitis (CP). Endoscopic pancreas function tests (ePFTs), where a peak bicarbonate concentration (PBC) ≥80 mEq/L in pancreas juice is considered normal, are now used more frequently. In this ePFT, aspirates start 35 minutes after secretin administration because pancreas output peaks 30 minutes after secretagogue administration...
April 3, 2017: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28369170/supervised-multiblock-sparse-multivariable-analysis-with-application-to-multimodal-brain-imaging-genetics
#20
Atsushi Kawaguchi, Fumio Yamashita
This article proposes a procedure for describing the relationship between high-dimensional data sets, such as multimodal brain images and genetic data. We propose a supervised technique to incorporate the clinical outcome to determine a score, which is a linear combination of variables with hieratical structures to multimodalities. This approach is expected to obtain interpretable and predictive scores. The proposed method was applied to a study of Alzheimer's disease (AD). We propose a diagnostic method for AD that involves using whole-brain magnetic resonance imaging (MRI) and positron emission tomography (PET), and we select effective brain regions for the diagnostic probability and investigate the genome-wide association with the regions using single nucleotide polymorphisms (SNPs)...
March 19, 2017: Biostatistics
keyword
keyword
72563
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"