keyword
MENU ▼
Read by QxMD icon Read
search

tensor network

keyword
https://www.readbyqxmd.com/read/28079471/pre-implant-modeling-of-depth-lead-placement-in-white-matter-for-maximizing-the-extent-of-cortical-activation-during-direct-neurostimulation-therapy
#1
Leopoldo Cendejas Zaragoza, Richard W Byrne, Marvin A Rossi
INTRODUCTION: The objective of this work was to predict preoperatively the maximum extent to which direct stimulation therapy can propagate through an epileptic circuit for stabilizing refractory focal-onset epilepsy. A pre-surgical workflow is presented which comprises a computationally intensive process for calculating the volume of cortical activation (VOCA) surrounding cylindrical depth contacts virtually placed in white matter. The process employs an activation function (AF) derived from cable modeling of an axon...
January 12, 2017: Neurological Research
https://www.readbyqxmd.com/read/28070912/role-of-testosterone-and-y-chromosome-genes-for-the-masculinization-of-the-human-brain
#2
Ivanka Savic, Louise Frisen, Amirhossein Manzouri, Anna Nordenstrom, Angelica Lindén Hirschberg
: Women with complete androgen insensitivity syndrome (CAIS) have a male (46,XY) karyotype but no functional androgen receptors. Their condition, therefore, offers a unique model for studying testosterone effects on cerebral sex dimorphism. We present MRI data from 16 women with CAIS and 32 male (46,XY) and 32 female (46,XX) controls. METHODS: FreeSurfer software was employed to measure cortical thickness and subcortical structural volumes. Axonal connections, indexed by fractional anisotropy, (FA) were measured with diffusion tensor imaging, and functional connectivity with resting state fMRI...
January 10, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28070001/neuroimaging-biomarkers-predict-brain-structural-connectivity-change-in-a-mouse-model-of-vascular-cognitive-impairment
#3
Philipp Boehm-Sturm, Martina Füchtemeier, Marco Foddis, Susanne Mueller, Rebecca C Trueman, Marietta Zille, Jan Leo Rinnenthal, Theodore Kypraios, Laurence Shaw, Ulrich Dirnagl, Tracy D Farr
BACKGROUND AND PURPOSE: Chronic hypoperfusion in the mouse brain has been suggested to mimic aspects of vascular cognitive impairment, such as white matter damage. Although this model has attracted attention, our group has struggled to generate a reliable cognitive and pathological phenotype. This study aimed to identify neuroimaging biomarkers of brain pathology in aged, more severely hypoperfused mice. METHODS: We used magnetic resonance imaging to characterize brain degeneration in mice hypoperfused by refining the surgical procedure to use the smallest reported diameter microcoils (160 μm)...
January 9, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28067221/quantum-chemical-insights-from-deep-tensor-neural-networks
#4
Kristof T Schütt, Farhad Arbabzadah, Stefan Chmiela, Klaus R Müller, Alexandre Tkatchenko
Learning from data has led to paradigm shifts in a multitude of disciplines, including web, text and image search, speech recognition, as well as bioinformatics. Can machine learning enable similar breakthroughs in understanding quantum many-body systems? Here we develop an efficient deep learning approach that enables spatially and chemically resolved insights into quantum-mechanical observables of molecular systems. We unify concepts from many-body Hamiltonians with purpose-designed deep tensor neural networks, which leads to size-extensive and uniformly accurate (1 kcal mol(-1)) predictions in compositional and configurational chemical space for molecules of intermediate size...
January 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28066709/alterations-of-white-matter-structural-networks-in-patients-with-non-neuropsychiatric-systemic-lupus-erythematosus-identified-by-probabilistic-tractography-and-connectivity-based-analyses
#5
Man Xu, Xiangliang Tan, Xinyuan Zhang, Yihao Guo, Yingjie Mei, Qianjin Feng, Yikai Xu, Yanqiu Feng
PURPOSE: Systemic lupus erythematosus (SLE) is a chronic inflammatory female-predominant autoimmune disease that can affect the central nervous system and exhibit neuropsychiatric symptoms. In SLE patients without neuropsychiatric symptoms (non-NPSLE), recent diffusion tensor imaging studies showed white matter abnormalities in their brains. The present study investigated the entire brain white matter structural connectivity in non-NPSLE patients by using probabilistic tractography and connectivity-based analyses...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28059709/microstructure-of-the-default-mode-network-in-preterm-infants
#6
J Cui, O Tymofiyeva, R Desikan, T Flynn, H Kim, D Gano, C P Hess, D M Ferriero, A J Barkovich, D Xu
BACKGROUND AND PURPOSE: Diffusion and fMRI has been providing insights to brain development in addition to anatomic imaging. This study aimed to evaluate the microstructure of white matter tracts underlying the default mode network in premature infants by using resting-state functional MR imaging in conjunction with diffusion tensor imaging-based tractography. MATERIALS AND METHODS: A cohort of 44 preterm infants underwent structural T1-weighted imaging, resting-state fMRI, and DTI at 3T, including 21 infants with brain injuries and 23 infants with normal-appearing structural imaging as controls...
November 10, 2016: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28054968/enhance-the-quality-of-crowdsensing-for-fine-grained-urban-environment-monitoring-via-data-correlation
#7
Xu Kang, Liang Liu, Huadong Ma
Monitoring the status of urban environments, which provides fundamental information for a city, yields crucial insights into various fields of urban research. Recently, with the popularity of smartphones and vehicles equipped with onboard sensors, a people-centric scheme, namely "crowdsensing", for city-scale environment monitoring is emerging. This paper proposes a data correlation based crowdsensing approach for fine-grained urban environment monitoring. To demonstrate urban status, we generate sensing images via crowdsensing network, and then enhance the quality of sensing images via data correlation...
January 4, 2017: Sensors
https://www.readbyqxmd.com/read/28032370/modular-level-alterations-of-structure-function-coupling-in-schizophrenia-connectome
#8
Yu Sun, Zhongxiang Dai, Junhua Li, Simon L Collinson, Kang Sim
Convergent evidences have revealed that schizophrenia is associated with brain dysconnectivity, which leads to abnormal network organization. However, discrepancies were apparent between the structural connectivity (SC) and functional connectivity (FC) studies, and the relationship between structural and functional deficits in schizophrenia remains largely unknown. In this study, resting-state functional magnetic resonance imaging and structural diffusion tensor imaging were performed in 20 patients with schizophrenia and 20 matched healthy volunteers (patients/controls = 19/17 after head motion rejection)...
December 29, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/28032201/intrinsic-functional-connectivity-of-fronto-temporal-networks-in-adolescents-with-early-psychosis
#9
Cristina Solé-Padullés, Josefina Castro-Fornieles, Elena de la Serna, Vanessa Sánchez-Gistau, Soledad Romero, Olga Puig, Anna Calvo, Nuria Bargalló, Inmaculada Baeza, Gisela Sugranyes
Adults with psychotic disorders have abnormal connectivity of fronto-temporal networks. However, whether these abnormalities are present in adolescents with early psychosis has not been fully assessed. One-hundred and thirty-nine adolescents aged 12-18 underwent resting-state functional magnetic resonance imaging and diffusion tensor imaging. Following motion correction, data were available for 44 participants with a psychosis risk syndrome, 34 patients with a first episode psychosis (FEP) and 35 healthy controls...
December 28, 2016: European Child & Adolescent Psychiatry
https://www.readbyqxmd.com/read/28031219/preoperative-automated-fibre-quantification-predicts-postoperative-seizure-outcome-in-temporal-lobe-epilepsy
#10
Simon S Keller, G Russell Glenn, Bernd Weber, Barbara A K Kreilkamp, Jens H Jensen, Joseph A Helpern, Jan Wagner, Gareth J Barker, Mark P Richardson, Leonardo Bonilha
Approximately one in every two patients with pharmacoresistant temporal lobe epilepsy will not be rendered completely seizure-free after temporal lobe surgery. The reasons for this are unknown and are likely to be multifactorial. Quantitative volumetric magnetic resonance imaging techniques have provided limited insight into the causes of persistent postoperative seizures in patients with temporal lobe epilepsy. The relationship between postoperative outcome and preoperative pathology of white matter tracts, which constitute crucial components of epileptogenic networks, is unknown...
January 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28007987/connectomic-correlates-of-response-to-treatment-in-first-episode-psychosis
#11
Nicolas A Crossley, Tiago Reis Marques, Heather Taylor, Chris Chaddock, Flavio Dell'Acqua, Antje A T S Reinders, Valeria Mondelli, Marta DiForti, Andrew Simmons, Anthony S David, Shitij Kapur, Carmine M Pariante, Robin M Murray, Paola Dazzan
Connectomic approaches using diffusion tensor imaging have contributed to our understanding of brain changes in psychosis, and could provide further insights into the neural mechanisms underlying response to antipsychotic treatment. We here studied the brain network organization in patients at their first episode of psychosis, evaluating whether connectome-based descriptions of brain networks predict response to treatment, and whether they change after treatment. Seventy-six patients with a first episode of psychosis and 74 healthy controls were included...
December 21, 2016: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/27995064/combined-18-f-fdg-pet-and-diffusion-tensor-imaging-in-mesial-temporal-lobe-epilepsy-with-hippocampal-sclerosis
#12
Javier Aparicio, Mar Carreño, Núria Bargalló, Xavier Setoain, Sebastià Rubí, Jordi Rumià, Carles Falcón, Anna Calvo, Berta Martí-Fuster, Nelly Padilla, Teresa Boget, Luís Pintor, Antonio Donaire
OBJECTIVES: Several studies using (18)F-fluorodeoxyglucose positron emission tomography ((18)F-FDG-PET) or diffusion tensor imaging (DTI) have found both temporal and extratemporal abnormalities in patients with mesial temporal lobe epilepsy with ipsilateral hippocampal sclerosis (MTLE-HS), but data are lacking about the findings of both techniques in the same patients. We aimed to determine whether the extent of (18)F-FDG-PET hypometabolism is related to DTI abnormalities. METHODS: Twenty-one patients with MTLE-HS underwent comprehensive preoperative evaluation; 18 (86%) of these underwent epilepsy surgery...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27989571/mapping-the-convergent-temporal-epileptic-network-in-left-and-right-temporal-lobe-epilepsy
#13
Peng Fang, Jie An, Ling-Li Zeng, Hui Shen, Shijun Qiu, Dewen Hu
Left and right mesial temporal lobe epilepsy (mTLE) with hippocampal sclerosis (HS) exhibits similar functional and clinical dysfunctions, such as depressive mood and emotional dysregulation, implying that the left and right mTLE may share a common network substrate. However, the convergent anatomical network disruption between the left and right HS remains largely uncharacterized. This study aimed to investigate whether the left and right mTLE share a similar anatomical network. We examined 43 (22 left, 21 right) mTLE patients with HS and 39 healthy controls using diffusion tensor imaging...
December 15, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27942447/altered-structural-and-functional-thalamocortical-networks-in-secondarily-generalized-extratemporal-lobe-seizures
#14
Syu-Jyun Peng, Yue-Loong Hsin
Structural and functional abnormalities in the thalamocortical network in primary generalized epilepsies or mesial temporal lobe epilepsy have recently been identified by voxel-wise analyses of neuroimaging. However, evidence is needed regarding the profiles of the thalamocortical network in patients with secondarily generalized seizures from focal neocortical sources. We used high-resolution T1-weighted, diffusion-tensor and resting-state functional MR imaging (rs-fMRI) to examine 16 patients with secondarily generalized extratemporal lobe seizures and 16 healthy controls...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27935154/disruption-of-rich-club-organisation-in-cerebral-small-vessel-disease
#15
Anil M Tuladhar, Andrew Lawrence, David G Norris, Thomas R Barrick, Hugh S Markus, Frank-Erik de Leeuw
Cerebral small vessel disease (SVD) is an important cause of vascular cognitive impairment. Recent studies have demonstrated that structural connectivity of brain networks in SVD is disrupted. However, little is known about the extent and location of the reduced connectivity in SVD. Here they investigate the rich club organisation-a set of highly connected and interconnected regions-and investigate whether there is preferential rich club disruption in SVD. Diffusion tensor imaging (DTI) and cognitive assessment were performed in a discovery sample of SVD patients (n = 115) and healthy control subjects (n = 50)...
December 9, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27930915/anatomical-dysconnectivity-in-bipolar-disorder-compared-with-schizophrenia-a-selective-review-of-structural-network-analyses-using-diffusion-mri
#16
REVIEW
Stefani O'Donoghue, Laurena Holleran, Dara M Cannon, Colm McDonald
BACKGROUND: The dysconnectivity hypothesis suggests that psychotic illnesses arise not from regionally specific focal pathophysiology, but rather from impaired neuroanatomical integration across networks of brain regions. Decreased white matter organization has been hypothesized to be a feature of psychotic illnesses in general, which is supported by meta-analyses of DTI studies in bipolar disorder and schizophrenia. Although many diffusion MRI studies investigate bipolar disorder and schizophrenia alone, relatively few studies directly compare structural features in these psychotic illnesses...
February 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/27928029/local-changes-in-network-structure-contribute-to-late-communication-recovery-after-severe-brain-injury
#17
Daniel J Thengone, Henning U Voss, Esteban A Fridman, Nicholas D Schiff
Spontaneous recovery of brain function after severe brain injury may evolve over a long time period and is likely to involve both structural and functional reorganization of brain networks. We longitudinally tracked the recovery of communication in a patient with severe brain injury using multimodal brain imaging techniques and quantitative behavioral assessments measured at the bedside over a period of 2 years and 9 months (21 months after initial injury). Structural diffusion tensor imaging revealed changes in brain structure across interhemispheric connections and in local brain regions that support language and visuomotor function...
December 7, 2016: Science Translational Medicine
https://www.readbyqxmd.com/read/27924721/structural-brain-connectome-and-cognitive-impairment-in-parkinson-disease
#18
Sebastiano Galantucci, Federica Agosta, Elka Stefanova, Silvia Basaia, Martijn P van den Heuvel, Tanja Stojković, Elisa Canu, Iva Stanković, Vladana Spica, Massimiliano Copetti, Delia Gagliardi, Vladimir S Kostić, Massimo Filippi
Purpose To investigate the structural brain connectome in patients with Parkinson disease (PD) and mild cognitive impairment (MCI) and in patients with PD without MCI. Materials and Methods This prospective study was approved by the local ethics committees, and written informed consent was obtained from all subjects prior to enrollment. The individual structural brain connectome of 170 patients with PD (54 with MCI, 116 without MCI) and 41 healthy control subjects was obtained by using deterministic diffusion-tensor tractography...
December 7, 2016: Radiology
https://www.readbyqxmd.com/read/27922605/pattern-of-structural-brain-changes-in-social-anxiety-disorder-after-cognitive-behavioral-group-therapy-a-longitudinal-multimodal-mri-study
#19
V R Steiger, A B Brühl, S Weidt, A Delsignore, M Rufer, L Jäncke, U Herwig, J Hänggi
Social anxiety disorder (SAD) is characterized by fears of social and performance situations. Cognitive behavioral group therapy (CBGT) has in general positive effects on symptoms, distress and avoidance in SAD. Prior studies found increased cortical volumes and decreased fractional anisotropy (FA) in SAD compared with healthy controls (HCs). Thirty-three participants diagnosed with SAD attended in a 10-week CBGT and were scanned before and after therapy. We applied three neuroimaging methods-surface-based morphometry, diffusion tensor imaging and network-based statistics-each with specific longitudinal processing protocols, to investigate CBGT-induced structural brain alterations of the gray and white matter (WM)...
December 6, 2016: Molecular Psychiatry
https://www.readbyqxmd.com/read/27913368/content-driven-associative-memories-for-color-image-patterns
#20
Mingming Li, Shuzhi Sam Ge, Tong Heng Lee
This paper presents a novel content-driven associative memory (CDAM) to associate large-scale color images based on the subjects that represent the images' content. Compared to traditional associative memories, CDAM inherits their tolerance to random noise in images and possesses greater robustness against correlated noise that distorts an image's spatial contextual structure. A three-layer recurrent neural tensor network (RNTN) is designed as the network model of CDAM. Multiple salient objects detection algorithm and partial radial basis function (PRBF) kernel are proposed for subject determination and content-driven association, respectively...
November 29, 2016: IEEE Transactions on Cybernetics
keyword
keyword
92751
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"