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https://www.readbyqxmd.com/read/28922858/contributions-of-the-medial-prefrontal-cortex-to-social-influence-in-economic-decision-making
#1
M A J Apps, N Ramnani
Economic decisions are guided by highly subjective reward valuations (SVs). Often these SVs are over-ridden when individuals conform to social norms. Yet, the neural mechanisms that underpin the distinct processing of such normative reward valuations (NVs) are poorly understood. The dorsomedial and ventromedial portions of the prefrontal cortex (dmPFC/vmPFC) are putatively key regions for processing social and economic information respectively. However, the contribution of these regions to economic decisions guided by social norms is unclear...
September 1, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28922524/dynamic-contrast-enhanced-mri-in-orbital-lymphoproliferative-disorders-effects-of-region-of-interest-selection-methods-on-time-efficiency-measurement-reproducibility-and-diagnostic-ability
#2
Wen Qian, Xiao-Quan Xu, Hao Hu, Guo-Yi Su, Jiang-Fen Wu, Hai-Bin Shi, Fei-Yun Wu
BACKGROUND: Previous studies indicated that dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) could serve as a useful biomarker for differentiating malignant from benign orbital lymphoproliferative disorders (OLPDs). PURPOSE: To investigate the influence of different region of interest (ROI) selection methods on the measurements of DCE-MRI parameters, and their diagnostic ability in discriminating malignant from benign OLPDs. STUDY TYPE: Retrospective study...
September 18, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28921634/the-role-of-whole-brain-diffusion-mri-as-a-tool-for-studying-human-in-vivo-cortical-segregation-based-on-a-measure-of-neurite-density
#3
Fernando Calamante, Ben Jeurissen, Robert E Smith, Jacques-Donald Tournier, Alan Connelly
PURPOSE: To investigate whether diffusion MRI can be used to study cortical segregation based on a contrast related to neurite density, thus providing a complementary tool to myelin-based MRI techniques used for myeloarchitecture. METHODS: Several myelin-sensitive MRI methods (e.g., based on T1 , T2 , and T2*) have been proposed to parcellate cortical areas based on their myeloarchitecture. Recent improvements in hardware, acquisition, and analysis methods have opened the possibility of achieving a more robust characterization of cortical microstructure using diffusion MRI...
September 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28921173/maximizing-safe-resections-the-roles-of-5-aminolevulinic-acid-and-intraoperative-mr-imaging-in-glioma-surgery-review-of-the-literature
#4
REVIEW
Eric Suero Molina, S Schipmann, W Stummer
Malignant glioma surgery involves the challenge of preserving the neurological status of patients harboring these lesions while pursuing a maximal tumor resection, which is correlated with overall and progression-free survival. Presently, several tools exist for assisting neurosurgeons in visualizing malignant tissue. Fluorescence-guided surgery (FGS) with 5-aminolevulinic acid (5-ALA) has increasingly been used during the last decade for identifying malignant glioma. Intraoperative magnetic resonance imaging (iMRI), first introduced in the mid-1990s, is being evaluated as a further tool to maximize the extent of resection...
September 18, 2017: Neurosurgical Review
https://www.readbyqxmd.com/read/28921052/in-vitro-evaluation-of-flow-patterns-and-turbulent-kinetic-energy-in-trans-catheter-aortic-valve-prostheses
#5
Daniel Giese, Kilian Weiss, Bettina Baeßler, Navid Madershahian, Yeong-Hoon Choi, David Maintz, Alexander C Bunck
OBJECTIVES: The objective of the current work was to evaluate flow and turbulent kinetic energy in different transcatheter aortic valve implants using highly undersampled time-resolved multi-point 3-directional phase-contrast measurements (4D Flow MRI) in an in vitro setup. MATERIALS AND METHODS: A pulsatile flow setup was used with a compliant tubing mimicking a stiff left ventricular outflow tract and ascending aorta. Five different implants were measured using a highly undersampled multi-point 4D Flow MRI sequence...
September 18, 2017: Magma
https://www.readbyqxmd.com/read/28920444/mri-findings-and-demographics-of-elastofibroma-dorsi-assessment-of-diffusion-weighted-imaging-and-contrast-enhancement-patterns
#6
Maho Tsubakimoto, Tsuneo Yamashiro, Nanae Tsuchiya, Masahiro Okada, Hiroki Maehara, Kaoru Kitsukawa, Sadayuki Murayama
Background Elastofibroma dorsi is a rare pseudotumoral lesion. Thus, there is no report of magnetic resonance imaging (MRI) findings that investigates multiple patients particularly with respect to diffusion-weighted imaging (DWI) findings and contrast enhancement patterns. Purpose To describe the imaging findings of elastofibroma on MRI, particularly DWI findings and contrast enhancement patterns, and to further investigate patient demographics. Material and Methods Forty-four patients with elastofibroma that underwent MRI were enrolled in this retrospective study...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28919857/divergent-roles-of-vascular-burden-and-neurodegeneration-in-the-cognitive-decline-of-geriatric-depression-patients-and-mild-cognitive-impairment-patients
#7
Qing Ye, Fan Su, Liang Gong, Hao Shu, Wenxiang Liao, Chunming Xie, Hong Zhou, Zhijun Zhang, Feng Bai
Both geriatric depression and mild cognitive impairment (MCI) confer an increased risk for the development of dementia. The mechanisms underlying the development of cognitive impairment in geriatric depression patients remain controversial. The present study aimed to explore the association of cognitive decline with vascular risk, white matter hyperintensity (WMH) burden and hippocampal volume in both remitted geriatric depression (RGD) subjects and amnestic mild cognitive impairment (aMCI) subjects. Forty-one RGD subjects, 51 aMCI subjects, and 64 healthy elderly subjects underwent multimodal MRI scans and neuropsychological tests at both baseline and a 35-month follow-up...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28919744/composite-iron-oxide-prussian-blue-nanoparticles-for-magnetically-guided-t1-weighted-magnetic-resonance-imaging-and-photothermal-therapy-of-tumors
#8
Shraddha S Kale, Rachel A Burga, Elizabeth E Sweeney, Zungho Zun, Raymond W Sze, Anthony Tuesca, J Anand Subramony, Rohan Fernandes
Theranostic nanoparticles offer the potential for mixing and matching disparate diagnostic and therapeutic functionalities within a single nanoparticle for the personalized treatment of diseases. In this article, we present composite iron oxide-gadolinium-containing Prussian blue nanoparticles (Fe3O4@GdPB) as a novel theranostic agent for T1-weighted magnetic resonance imaging (MRI) and photothermal therapy (PTT) of tumors. These particles combine the well-described properties and safety profiles of the constituent Fe3O4 nanoparticles and gadolinium-containing Prussian blue nanoparticles...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28918752/correlation-of-csf-flow-using-phase-contrast-mri-with-ventriculomegaly-and-csf-opening-pressure-in-mucopolysaccharidoses
#9
Amauri Dalla Corte, Carolina F M de Souza, Maurício Anés, Fabio K Maeda, Armelle Lokossou, Leonardo M Vedolin, Maria Gabriela Longo, Monica M Ferreira, Solanger G P Perrone, Olivier Balédent, Roberto Giugliani
BACKGROUND: Very little is known about the incidence and prevalence of hydrocephalus in patients with mucopolysaccharidoses (MPS). The biggest challenge is to distinguish communicating hydrocephalus from ventricular dilatation secondary to brain atrophy, because both conditions share common clinical and neuroradiological features. The main purpose of this study is to assess the relationship between ventriculomegaly, brain and cerebrospinal fluid (CSF) volumes, aqueductal and cervical CSF flows, and CSF opening pressure in MPS patients, and to provide potential biomarkers for abnormal CSF circulation...
September 18, 2017: Fluids and Barriers of the CNS
https://www.readbyqxmd.com/read/28918693/cognitive-control-networks-in-ocd-a-resting-state-connectivity-study-in-unmedicated-patients-with-obsessive-compulsive-disorder-and-their-unaffected-relatives
#10
Froukje E de Vries, Stella J de Wit, Odile A van den Heuvel, Dick J Veltman, Danielle C Cath, Anton J L M van Balkom, Ysbrand D van der Werf
OBJECTIVES: Executive network deficits are putative neurocognitive endophenotypes for obsessive-compulsive disorder (OCD). Yet, unlike alterations in fronto-striatal and limbic connectivity, connectivity in the fronto-parietal (FPN) and cingulo-opercular (CON) networks involved in cognitive control has received little attention. METHODS: The coherence of FPN, CON and fronto-limbic networks was investigated in 39 unmedicated OCD patients, 16 of their unaffected siblings and 36 healthy controls using resting-state functional-connectivity MRI and a seed-based analysis approach...
September 18, 2017: World Journal of Biological Psychiatry
https://www.readbyqxmd.com/read/28916603/phase-2a-clinical-trial-of-mitochondrial-protection-elamipretide-during-stent-revascularization-in-patients-with-atherosclerotic-renal-artery-stenosis
#11
Ahmed Saad, Sandra M S Herrmann, Alfonso Eirin, Christopher M Ferguson, James F Glockner, Haraldur Bjarnason, Michael A McKusick, Sanjay Misra, Lilach O Lerman, Stephen C Textor
BACKGROUND: Atherosclerotic renal artery stenosis reduces renal blood flow (RBF) and amplifies stenotic kidney hypoxia. Revascularization with percutaneous transluminal renal angioplasty (PTRA) and stenting often fails to recover renal function, possibly because of ischemia/reperfusion injury developing after PTRA. Elamipretide is a mitochondrial-targeted peptide that binds to cardiolipin and stabilizes mitochondrial function. We tested the hypothesis that elamipretide plus PTRA would improve renal function, oxygenation, and RBF in patients with atherosclerotic renal artery stenosis undergoing PTRA...
September 2017: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28916388/differential-effects-of-fxr-or-tgr5-activation-in-cholangiocarcinoma-progression
#12
O Erice, I Labiano, A Arbelaiz, A Santos-Laso, P Munoz-Garrido, R Jimenez-Agüero, P Olaizola, A Caro-Maldonado, N Martín-Martín, A Carracedo, E Lozano, J J Marin, C J O'Rourke, J B Andersen, J Llop, V Gómez-Vallejo, D Padro, A Martin, M Marzioni, L Adorini, M Trauner, L Bujanda, M J Perugorria, J M Banales
BACKGROUND AND AIMS: Cholangiocarcinoma (CCA) is an aggressive tumor type affecting cholangiocytes. CCAs frequently arise under certain cholestatic liver conditions. Intrahepatic accumulation of bile acids may facilitate cocarcinogenic effects by triggering an inflammatory response and cholangiocyte proliferation. Here, the role of bile acid receptors FXR and TGR5 in CCA progression was evaluated. METHODS: FXR and TGR5 expression was determined in human CCA tissues and cell lines...
September 12, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28916180/interpreting-temporal-fluctuations-in-resting-state-functional-connectivity-mri
#13
REVIEW
Raphaël Liégeois, Timothy O Laumann, Abraham Z Snyder, Juan Zhou, B T Thomas Yeo
Resting-state functional connectivity is a powerful tool for studying human functional brain networks. Temporal fluctuations in functional connectivity, i.e., dynamic functional connectivity (dFC), are thought to reflect dynamic changes in brain organization and non-stationary switching of discrete brain states. However, recent studies have suggested that dFC might be attributed to sampling variability of static FC. Despite this controversy, a detailed exposition of stationarity and statistical testing of dFC is lacking in the literature...
September 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28916141/in-vivo-multimodal-tumor-imaging-and-photodynamic-therapy-with-novel-theranostic-agents-based-on-the-porphyrazine-framework-chelated-gadolinium-iii-cation
#14
Diana V Yuzhakova, Svetlana A Lermontova, Ilya S Grigoryev, Maria S Muravieva, Alena I Gavrina, Marina V Shirmanova, Irina V Balalaeva, Larisa G Klapshina, Elena V Zagaynova
BACKGROUND: A promising strategy for cancer diagnosis and therapy is the development of an agent for multimodal imaging and treatment. In the present paper we report on two novel multifunctional agents prepared on the porphyrazine pigment platform using a gadolinium (III) cation chelated by red-fluorescent tetrapyrrole macrocycles (GdPz1 and GdPz2). METHODS: Spectral and magnetic properties of the compounds were analyzed. Monitoring of GdPz1 and GdPz2 accumulation in the murine colon carcinoma CT26 was performed in vivo using fluorescence imaging and MRI...
September 12, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28915312/dce-and-dw-mri-as-early-imaging-biomarkers-of-treatment-response-in-a-preclinical-model-of-triple-negative-breast-cancer
#15
Stephanie L Barnes, Anna G Sorace, Jennifer G Whisenant, J Oliver McIntyre, Hakmook Kang, Thomas E Yankeelov
This work evaluates quantitative dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) and diffusion-weighted MRI (DW-MRI) parameters as early biomarkers of response in a preclinical model of triple negative breast cancer (TNBC). The standard Tofts' model of DCE-MRI returns estimates of the volume transfer constant (K(trans) ) and the extravascular extracellular volume fraction (ve ). DW-MRI returns estimates of the apparent diffusion coefficient (ADC). Mice (n = 38) were injected subcutaneously with MDA-MB-231...
September 15, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28915082/a-combined-study-of-slc6a15-gene-polymorphism-and-the-resting-state-functional-magnetic-resonance-imaging-in-first-episode-drug-naive-major-depressive-disorder
#16
Lijuan Wang, Zhifen Liu, Xiaohua Cao, Jianying Li, Aixia Zhang, Ning Sun, Chunxia Yang, Kerang Zhang
AIMS: The SLC6A15 gene has been identified as a novel candidate gene for major depressive disorder (MDD). However, the mechanism underlying the effects of how the SLC6A15 gene affects functional brain activity of patients with MDD remains unknown. METHODS: In the present study, we investigated the effect of the SLC6A15 gene polymorphism, rs1545843, on resting-state brain function in MDD with the imaging genomic technology and the regional homogeneity (ReHo) method...
September 2017: Genetic Testing and Molecular Biomarkers
https://www.readbyqxmd.com/read/28913930/accuracy-repeatability-and-interplatform-reproducibility-of-t1-quantification-methods-used-for-dce-mri-results-from-a-multicenter-phantom-study
#17
Octavia Bane, Stefanie J Hectors, Mathilde Wagner, Lori L Arlinghaus, Madhava P Aryal, Yue Cao, Thomas L Chenevert, Fiona Fennessy, Wei Huang, Nola M Hylton, Jayashree Kalpathy-Cramer, Kathryn E Keenan, Dariya I Malyarenko, Robert V Mulkern, David C Newitt, Stephen E Russek, Karl F Stupic, Alina Tudorica, Lisa J Wilmes, Thomas E Yankeelov, Yi-Fei Yen, Michael A Boss, Bachir Taouli
PURPOSE: To determine the in vitro accuracy, test-retest repeatability, and interplatform reproducibility of T1 quantification protocols used for dynamic contrast-enhanced MRI at 1.5 and 3 T. METHODS: A T1 phantom with 14 samples was imaged at eight centers with a common inversion-recovery spin-echo (IR-SE) protocol and a variable flip angle (VFA) protocol using seven flip angles, as well as site-specific protocols (VFA with different flip angles, variable repetition time, proton density, and Look-Locker inversion recovery)...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28911220/contrast-enhanced-ultrasound-ceus-liver-imaging-reporting-and-data-system-li-rads-2017-a-review-of-important-differences-compared-to-the-ct-mri-system
#18
Tae Kyoung Kim, Seung Yeon Noh, Stephanie R Wilson, Yuko Kono, Fabio Piscaglia, Hyun-Jung Jang, Andrej Lyshchik, Christoph F Dietrich, Juergen K Willmann, Alexander Vezeridis, Claude B Sirlin
Medical imaging plays an important role in the diagnosis and management of hepatocellular carcinoma (HCC). The Liver Imaging Reporting and Data System (LI-RADS) was initially created to standardize the reporting and data collection of CT and MR imaging for patients at risk for HCC. As contrast-enhanced ultrasound (CEUS) has been widely used in clinical practice, it has recently been added to the LI-RADS. While CEUS LI-RADS shares fundamental concepts with CT/MRI LI-RADS, there are key differences between the modalities reflecting dissimilarities in the underlying methods of image acquisition and types of contrast material...
September 15, 2017: Clinical and Molecular Hepatology
https://www.readbyqxmd.com/read/28910821/vascular-disrupting-agent-in-pancreatic-and-hepatic-tumour-allografts-observations-of-location-dependent-efficacy-by-mri-microangiography-and-histomorphology
#19
Ting Yin, Yewei Liu, Ronald Peeters, Yuanbo Feng, Jie Yu, Uwe Himmelreich, Raymond Oyen, Yicheng Ni
BACKGROUND: Tumours growing in organs of different vascular environment could exhibit diverse responses to vascular disrupting agent (VDA). This study was aimed to identify in vivo imaging biomarkers for evaluation of pancreatic and hepatic tumours and comparison of their responses to a VDA Combretastatin A4 Phosphate (CA4P) using multiparametric MRI. METHODS: Male WAG/Rij rats were used for orthotopic pancreatic head tumour and hepatic tumour implantation; tumour growth was monitored by 3D isotropic MRI using a 3...
September 14, 2017: British Journal of Cancer
https://www.readbyqxmd.com/read/28906338/a-pharmacokinetics-efficacy-and-safety-study-of-gadoterate-meglumine-in-pediatric-subjects-aged-younger-than-2-years
#20
Mario Scala, Meriam Koob, Sophie de Buttet, Philippe Bourrinet, Mathieu Felices, Elzbieta Jurkiewicz
OBJECTIVES: The primary objective of this study was to investigate the pharmacokinetic profile of gadoterate meglumine in pediatric patients younger than 2 years; the secondary objectives were to document its efficacy and safety. MATERIAL AND METHODS: This was a Phase IV open-label, prospective study conducted in 9 centers (4 countries). Forty-five patients younger than 2 years with normal estimated glomerular filtration rate and scheduled to undergo routine gadolinium-enhanced magnetic resonance imaging (MRI) of any organ were included and received a single intravenous injection of gadoterate meglumine (0...
September 12, 2017: Investigative Radiology
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