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https://www.readbyqxmd.com/read/29223742/network-analysis-reveals-disrupted-functional-brain-circuitry-in-drug-naive-social-anxiety-disorder
#1
REVIEW
Xun Yang, Jin Liu, Yajing Meng, Mingrui Xia, Zaixu Cui, Xi Wu, Xinyu Hu, Wei Zhang, Gaolang Gong, Qiyong Gong, John A Sweeney, Yong He
Social anxiety disorder (SAD) is a common and disabling condition characterized by excessive fear and avoidance of public scrutiny. Neuroimaging studies have suggested that the emotional and behavior deficits in SAD are associated with abnormalities in regional brain function and functional connectivity. However, little is known about whether intrinsic functional brain networks in patients with SAD are topologically disrupted. Here, we collected resting-state fMRI data from 33 drug-naive patients with SAD and 32 healthy controls (HC), constructed functional networks with 34 predefined regions based on previous meta-analytic research with task-based fMRI in SAD, and performed network-based statistic and graph-theory analyses...
December 6, 2017: NeuroImage
https://www.readbyqxmd.com/read/29223329/the-impact-of-psychosis-on-brain-anatomy-in-bipolar-disorder-a-structural-mri-study
#2
A Carlo Altamura, Eleonora Maggioni, Taj Dhanoa, Valentina Ciappolino, Riccardo A Paoli, Laura Cremaschi, Cecilia Prunas, Giulia Orsenigo, Elisabetta Caletti, Claudia M Cinnante, Fabio M Triulzi, Bernardo Dell'Osso, Lakshmi Yatham, Paolo Brambilla
BACKGROUND: Bipolar disorder (BD) is a major psychiatric illness characterized by heterogeneous symptoms including psychotic features. Up until now, neuroimaging studies investigating cerebral morphology in patients with BD have underestimated the potential impact of psychosis on brain anatomy in BD patients. In this regard, psychotic and non-psychotic BD may represent biologically different subtypes of the disorder, being possibly associated with specific cerebral features. METHODS: In the present study, magnetic resonance imaging (MRI) at 3T was used to identify the neuroanatomical correlates of psychosis in an International sample of BD patients...
November 29, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/29222814/siena-xl-for-improving-the-assessment-of-gray-and-white-matter-volume-changes-on-brain-mri
#3
Marco Battaglini, Mark Jenkinson, Nicola De Stefano
In this article, SIENA-XL, a new segmentation-based longitudinal pipeline is introduced, for: (i) increasing the precision of longitudinal volume change estimation for white (WM) and gray (GM) matter separately, compared with cross-sectional segmentation methods such as SIENAX; and (ii) avoiding potential biases in registration-based methods when Jacobians are used, with a smoothing extent larger than spatial scale between tissue-interfaces, which is where atrophy usually occurs. SIENA-XL implements a new brain extraction procedure and a multi-time-point intensity equalization step before performing the final segmentation that also includes separate segmentation of deep GM structures by using FMRIB's Integrated Registration and Segmentation Tool...
December 8, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29222716/childhood-acute-disseminated-encephalomyelitis-an-egyptian-pilot-study
#4
Hamed Ahmed Elkhayat, Omnia Fathy El-Rashidy, Iman Ali Elagouza, Raghda Zaitoun, Yasser Abdel Azeem Abbas
Describing the variable clinical features, laboratory findings, neuroimaging findings, and treatments given to children who presented with ADEM and following them up both clinically and radiologically. 21 patients were recruited: 14 new cases, and 7 old ones presenting over the preceding 5 years (retrospective review of existing data). 11 males and 10 females, with a mean age of 4.4 years ± 2.7 SD, were included. All new patients were subject to full history, examination and a panel of investigations including MRI of the brain...
December 8, 2017: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/29222290/chronic-organ-failure-in-adult-sickle-cell-disease
#5
REVIEW
Elliott Vichinsky
Sickle cell disease is now a chronic adult illness characterized by progressive multiorgan failure, particularly involving the brain and kidney. The etiology is multifactorial; it includes hemolysis and nitric oxide deficiency. As patients age, most experience neurologic insult. Twenty-five percent of older adults have had a clinical stroke and at least half of the population have had a silent infarct, cortical atrophy, and neurocognitive impairment. Periodic screening with neuroimaging and neurocognitive testing is recommended...
December 8, 2017: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/29221915/structural-brain-development-a-review-of-methodological-approaches-and-best-practices
#6
REVIEW
Nandita Vijayakumar, Kathryn L Mills, Aaron Alexander-Bloch, Christian K Tamnes, Sarah Whittle
Continued advances in neuroimaging technologies and statistical modelling capabilities have improved our knowledge of structural brain development in children and adolescents. While this has provided an increasingly nuanced understanding of brain development, the field is still plagued by inconsistent findings. This review highlights the methodological diversity in existing longitudinal magnetic resonance imaging (MRI) studies on structural brain development during childhood and adolescence, and addresses how such variation might contribute to inconsistencies in the literature...
November 22, 2017: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/29221912/variable-clinical-phenotype-in-two-siblings-with-aicardi-gouti%C3%A3-res-syndrome-type-6-and-a-novel-mutation-in-the-adar-gene
#7
Lisa Schmelzer, Martin Smitka, Christine Wolf, Nadja Lucas, Victoria Tüngler, Gabriele Hahn, Andreas Tzschach, Nataliya Di Donato, Min Ae Lee-Kirsch, Maja von der Hagen
Aicardi-Goutières syndrome (AGS) is a hereditary inflammatory encephalopathy resulting in severe neurological damage in the majority of cases. We report on two siblings with AGS6 due to compound heterozygosity for a known and a novel mutation in the ADAR gene and a strikingly variable phenotype. The first sibling presented at 12 months of age with a subacute encephalopathy following a mild respiratory infection. The child developed a spastic tetraparesis, generalized dystonia and dysarthria. In contrast, the younger sibling presented with an acute episode of neurological impairment in his third year of life, from which he recovered without sequelae within a few weeks...
November 22, 2017: European Journal of Paediatric Neurology: EJPN
https://www.readbyqxmd.com/read/29221746/clinical-and-neuroimaging-characteristics-of-cerebral-sinovenous-thrombosis-in-neonates-undergoing-cardiac-surgery
#8
Nathalie H P Claessens, Selma O Algra, Nicolaas J G Jansen, Floris Groenendaal, Esther de Wit, Alexander A Wilbrink, Felix Haas, Antonius N J Schouten, Rutger A J Nievelstein, Manon J N L Benders, Linda S de Vries
OBJECTIVES: Neonates with congenital heart disease may have an increased risk of cerebral sinovenous thrombosis, but incidence rates are lacking. This study describes the clinical and neuroimaging characteristics of cerebral sinovenous thrombosis in neonates undergoing cardiac surgery. METHODS: Forty neonates (78% male) requiring neonatal univentricular or biventricular cardiac repair using cardiopulmonary bypass were included. All underwent preoperative (median postnatal day 7) and postoperative (median postoperative day 7) magnetic resonance imaging of the brain, including venography, to detect cerebral sinovenous thrombosis...
November 8, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29220866/neural-correlates-of-fatigue-in-multiple-sclerosis-a-combined-neurophysiological-and-neuroimaging-approach-r1
#9
M Russo, A Calamuneri, A Cacciola, L Bonanno, A Naro, V Dattola, E Sessa, M Buccafusca, D Milardi, P Bramanti, R S Calabrò, A Quartarone
The present study is aimed at further exploring structural and functional correlates of fatigue in Relapsing- Remitting Multiple Sclerosis (RRMS) patients by using a combined approach by means of transcranial magnetic stimulation (TMS) and a Diffusion Tensor Imaging (DTI). The physiopathology of fatigue in MS is still poorly understood, although a variety of pathogenic mechanisms has been proposed. Our working hypothesis is that diffuse microstructural white matter damage may subtend the cortico-subcortical functional disconnection described in patients with MS and fatigue...
September 30, 2017: Archives Italiennes de Biologie
https://www.readbyqxmd.com/read/29220823/patterns-of-progressive-atrophy-vary-with-age-in-alzheimer-s-disease-patients
#10
Cassidy M Fiford, Gerard R Ridgway, David M Cash, Marc Modat, Jennifer Nicholas, Emily N Manning, Ian B Malone, Geert Jan Biessels, Sebastien Ourselin, Owen T Carmichael, M Jorge Cardoso, Josephine Barnes
Age is not only the greatest risk factor for Alzheimer's disease (AD) but also a key modifier of disease presentation and progression. Here, we investigate how longitudinal atrophy patterns vary with age in mild cognitive impairment (MCI) and AD. Data comprised serial longitudinal 1.5-T magnetic resonance imaging scans from 153 AD, 339 MCI, and 191 control subjects. Voxel-wise maps of longitudinal volume change were obtained and aligned across subjects. Local volume change was then modeled in terms of diagnostic group and an interaction between group and age, adjusted for total intracranial volume, white-matter hyperintensity volume, and apolipoprotein E genotype...
November 14, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/29219958/spike-in-neuroimaging-requests-following-the-conviction-of-the-optometrist-honey-rose
#11
A Poostchi, M Awad, C Wilde, R A Dineen, A M Gruener
No abstract text is available yet for this article.
December 8, 2017: Eye
https://www.readbyqxmd.com/read/29219788/differential-patterns-of-metastatic-dissemination-across-medulloblastoma-subgroups
#12
Michal Zapotocky, Daddy Mata-Mbemba, David Sumerauer, Petr Liby, Alvaro Lassaletta, Josef Zamecnik, Lenka Krskova, Martin Kyncl, Jan Stary, Suzanne Laughlin, Anthony Arnoldo, Cynthia Hawkins, Uri Tabori, Michael D Taylor, Eric Bouffet, Charles Raybaud, Vijay Ramaswamy
OBJECTIVE Metastatic dissemination is a major treatment challenge and cause of death in patients with medulloblastoma. However, the influence of molecular biology on the pattern of metastatic dissemination at diagnosis is not known. In this study, the authors sought to define the location, pattern, and imaging characteristics of medulloblastoma metastases across subgroups at diagnosis. METHODS A consecutive cohort of patients with metastatic medulloblastoma at The Hospital for Sick Children and the University Hospital Motol, who underwent up-front MRI of the craniospinal axis, was assembled and allocated to subgroups using NanoString limited gene-expression profiling...
December 8, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/29218897/codon-bias-among-synonymous-rare-variants-is-associated-with-alzheimer-s-disease-imaging-biomarker
#13
Jason E Miller, Manu K Shivakumar, Shannon L Risacher, Andrew J Saykin, Seunggeun Lee, Kwangsik Nho, Dokyoon Kim
Alzheimer's disease (AD) is a neurodegenerative disorder with few biomarkers even though it impacts a relatively large portion of the population and is predicted to affect significantly more individuals in the future. Neuroimaging has been used in concert with genetic information to improve our understanding in relation to how AD arises and how it can be potentially diagnosed. Additionally, evidence suggests synonymous variants can have a functional impact on gene regulatory mechanisms, including those related to AD...
2018: Pacific Symposium on Biocomputing
https://www.readbyqxmd.com/read/29218892/heritability-estimates-on-resting-state-fmri-data-using-enigma-analysis-pipeline
#14
Bhim M Adhikari, Neda Jahanshad, Dinesh Shukla, David C Glahn, John Blangero, Richard C Reynolds, Robert W Cox, Els Fieremans, Jelle Veraart, Dmitry S Novikov, Thomas E Nichols, L Elliot Hong, Paul M Thompson, Peter Kochunov
Big data initiatives such as the Enhancing NeuroImaging Genetics through Meta-Analysis consortium (ENIGMA), combine data collected by independent studies worldwide to achieve more generalizable estimates of effect sizes and more reliable and reproducible outcomes. Such efforts require harmonized image analyses protocols to extract phenotypes consistently. This harmonization is particularly challenging for resting state fMRI due to the wide variability of acquisition protocols and scanner platforms; this leads to site-to-site variance in quality, resolution and temporal signal-to-noise ratio (tSNR)...
2018: Pacific Symposium on Biocomputing
https://www.readbyqxmd.com/read/29218829/intraclass-correlation-improved-modeling-approaches-and-applications-for-neuroimaging
#15
Gang Chen, Paul A Taylor, Simone P Haller, Katharina Kircanski, Joel Stoddard, Daniel S Pine, Ellen Leibenluft, Melissa A Brotman, Robert W Cox
Intraclass correlation (ICC) is a reliability metric that gauges similarity when, for example, entities are measured under similar, or even the same, well-controlled conditions, which in MRI applications include runs/sessions, twins, parent/child, scanners, sites, and so on. The popular definitions and interpretations of ICC are usually framed statistically under the conventional ANOVA platform. Here, we provide a comprehensive overview of ICC analysis in its prior usage in neuroimaging, and we show that the standard ANOVA framework is often limited, rigid, and inflexible in modeling capabilities...
December 7, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29218570/pure-correlates-of-exploration-and-exploitation-in-the-human-brain
#16
Tommy C Blanchard, Samuel J Gershman
Balancing exploration and exploitation is a fundamental problem in reinforcement learning. Previous neuroimaging studies of the exploration-exploitation dilemma could not completely disentangle these two processes, making it difficult to unambiguously identify their neural signatures. We overcome this problem using a task in which subjects can either observe (pure exploration) or bet (pure exploitation). Insula and dorsal anterior cingulate cortex showed significantly greater activity on observe trials compared to bet trials, suggesting that these regions play a role in driving exploration...
December 7, 2017: Cognitive, Affective & Behavioral Neuroscience
https://www.readbyqxmd.com/read/29218005/distributed-neural-activity-patterns-during-human-to-human-competition
#17
Matthew Piva, Xian Zhang, J Adam Noah, Steve W C Chang, Joy Hirsch
Interpersonal interaction is the essence of human social behavior. However, conventional neuroimaging techniques have tended to focus on social cognition in single individuals rather than on dyads or groups. As a result, relatively little is understood about the neural events that underlie face-to-face interaction. We resolved some of the technical obstacles inherent in studying interaction using a novel imaging modality and aimed to identify neural mechanisms engaged both within and across brains in an ecologically valid instance of interpersonal competition...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29217832/inter-and-intra-hemispheric-structural-imaging-markers-predict-depression-relapse-after-electroconvulsive-therapy-a-multisite-study
#18
Benjamin S C Wade, Jing Sui, Gerhard Hellemann, Amber M Leaver, Randall T Espinoza, Roger P Woods, Christopher C Abbott, Shantanu H Joshi, Katherine L Narr
Relapse of depression following treatment is high. Biomarkers predictive of an individual's relapse risk could provide earlier opportunities for prevention. Since electroconvulsive therapy (ECT) elicits robust and rapidly acting antidepressant effects, but has a >50% relapse rate, ECT presents a valuable model for determining predictors of relapse-risk. Although previous studies have associated ECT-induced changes in brain morphometry with clinical response, longer-term outcomes have not been addressed. Using structural imaging data from 42 ECT-responsive patients obtained prior to and directly following an ECT treatment index series at two independent sites (UCLA: n = 17, age = 45...
December 8, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/29217803/growth-hormone-deficiency-in-children-from-suspecting-to-diagnosing
#19
Varuna Vyas, Anil Kumar, Vandana Jain
Isolated Growth hormone deficiency is an important and treatable cause of short stature. However, it is often difficult to diagnose the condition with certainty due to the lack of a single robust diagnostic test. Short children, other than those with the classical phenotype of immature chubby facies, truncal obesity and micropenis in boys, or those with history of cranial lesions with known association with hypopituitarism, should be evaluated for growth hormone deficiency only after excluding the other more common conditions...
November 15, 2017: Indian Pediatrics
https://www.readbyqxmd.com/read/29217736/generation-of-structural-mr-images-from-amyloid-pet-application-to-mr-less-quantification
#20
Hongyoon Choi, Dong Soo Lee
Structural magnetic resonance (MR) images concomitantly acquired with PET images can provide crucial anatomical information for precise quantitative analysis. However, in the clinical setting, not all the subjects have corresponding MR. Here, we developed a model to generate structural MR images from amyloid PET using deep generative networks. We applied our model to quantification of cortical amyloid load without structural MR. Methods: We used florbetapir PET and structural MR data of Alzheimer's Disease Neuroimaging Initiative database...
December 7, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
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