keyword
MENU ▼
Read by QxMD icon Read
search

tensor network

keyword
https://www.readbyqxmd.com/read/28717361/research-of-hubs-location-method-for-weighted-brain-network-based-on-nos-fa
#1
Zhengkui Weng, Bin Wang, Jie Xue, Baojie Yang, Hui Liu, Xin Xiong
As a complex network of many interlinked brain regions, there are some central hub regions which play key roles in the structural human brain network based on T1 and diffusion tensor imaging (DTI) technology. Since most studies about hubs location method in the whole human brain network are mainly concerned with the local properties of each single node but not the global properties of all the directly connected nodes, a novel hubs location method based on global importance contribution evaluation index is proposed in this study...
2017: Computational Intelligence and Neuroscience
https://www.readbyqxmd.com/read/28713258/relationship-of-topology-multiscale-phase-synchronization-and-state-transitions-in-human-brain-networks
#2
Minkyung Kim, Seunghwan Kim, George A Mashour, UnCheol Lee
How the brain reconstitutes consciousness and cognition after a major perturbation like general anesthesia is an important question with significant neuroscientific and clinical implications. Recent empirical studies in animals and humans suggest that the recovery of consciousness after anesthesia is not random but ordered. Emergence patterns have been classified as progressive and abrupt transitions from anesthesia to consciousness, with associated differences in duration and electroencephalogram (EEG) properties...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28700727/longitudinal-increases-of-brain-metabolite-levels-in-5-10-year-old-children
#3
Martha J Holmes, Frances C Robertson, Francesca Little, Steven R Randall, Mark F Cotton, Andre J W van der Kouwe, Barbara Laughton, Ernesta M Meintjes
Longitudinal magnetic resonance imaging (MRI) and diffusion tensor imaging (DTI) studies reveal significant changes in brain structure and structural networks that occur together with cognitive and behavioral maturation in childhood. However, the underlying cellular changes accompanying brain maturation are less understood. Examining regional age-related changes in metabolite levels provides insight into the physiology of neurodevelopment. Magnetic resonance spectroscopy (MRS) measures localize brain metabolism...
2017: PloS One
https://www.readbyqxmd.com/read/28696763/renormalization-group-flows-of-hamiltonians-using-tensor-networks
#4
M Bal, M Mariën, J Haegeman, F Verstraete
A renormalization group flow of Hamiltonians for two-dimensional classical partition functions is constructed using tensor networks. Similar to tensor network renormalization [G. Evenbly and G. Vidal, Phys. Rev. Lett. 115, 180405 (2015)PRLTAO0031-900710.1103/PhysRevLett.115.180405; S. Yang, Z.-C. Gu, and X.-G. Wen, Phys. Rev. Lett. 118, 110504 (2017)PRLTAO0031-900710.1103/PhysRevLett.118.110504], we obtain approximate fixed point tensor networks at criticality. Our formalism, however, preserves positivity of the tensors at every step and hence yields an interpretation in terms of Hamiltonian flows...
June 23, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28695358/retained-executive-abilities-in-mild-cognitive-impairment-are-associated-with-increased-white-matter-network-connectivity
#5
Danielle C Farrar, Asim Z Mian, Andrew E Budson, Mark B Moss, Bang Bon Koo, Ronald J Killiany
PURPOSE: To describe structural network differences in individuals with mild cognitive impairment (MCI) with high versus low executive abilities, as reflected by measures of white matter connectivity using diffusion tensor imaging (DTI). MATERIALS AND METHODS: This was a retrospective, cross-sectional study. Of the 128 participants from the Alzheimer's Disease Neuroimaging Initiative database who had both a DTI scan as well as a diagnosis of MCI, we used an executive function score to classify the top 15 scoring patients as high executive ability, and the bottom-scoring 16 patients as low executive ability...
July 10, 2017: European Radiology
https://www.readbyqxmd.com/read/28689261/investigation-of-cognitive-circuits-using-steady-state-cerebral-blood-volume-and-diffusion-tensor-imaging-in-patients-with-mild-cognitive-impairment-following-electrical-injury
#6
Chang-Hyun Park, Cheong Hoon Seo, Myung Hun Jung, So Young Joo, Soyeon Jang, Ho Young Lee, Suk Hoon Ohn
PURPOSE: We utilized cerebral blood volume (CBV) magnetic resonance imaging and diffusion tensor imaging (DTI) to investigate changes in cognitive networks in patients experiencing cognitive dysfunction following electrical injury. METHODS: Cognitive function was assessed across various domains, including attention, verbal memory, executive function, and language. Depressive symptoms were also evaluated. CBV maps and DTI measures were obtained from 24 patients (age, 41...
July 8, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28688263/white-matter-correlates-of-impaired-attention-control-in-major-depressive-disorder-and-healthy-volunteers
#7
Mina M Rizk, Harry Rubin-Falcone, John Keilp, Jeffrey M Miller, M Elizabeth Sublette, Ainsley Burke, Maria A Oquendo, Ahmed M Kamal, Mohamed A Abdelhameed, J John Mann
BACKGROUND: Major depressive disorder (MDD) is associated with impaired attention control and alterations in frontal-subcortical connectivity. We hypothesized that attention control as assessed by Stroop task interference depends on white matter integrity in fronto-cingulate regions and assessed this relationship using diffusion tensor imaging (DTI) in MDD and healthy volunteers (HV). METHODS: DTI images and Stroop task were acquired in 29 unmedicated MDD patients and 16 HVs, aged 18-65 years...
June 30, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28679235/identifying-key-nodes-in-multilayer-networks-based-on-tensor-decomposition
#8
Dingjie Wang, Haitao Wang, Xiufen Zou
The identification of essential agents in multilayer networks characterized by different types of interactions is a crucial and challenging topic, one that is essential for understanding the topological structure and dynamic processes of multilayer networks. In this paper, we use the fourth-order tensor to represent multilayer networks and propose a novel method to identify essential nodes based on CANDECOMP/PARAFAC (CP) tensor decomposition, referred to as the EDCPTD centrality. This method is based on the perspective of multilayer networked structures, which integrate the information of edges among nodes and links between different layers to quantify the importance of nodes in multilayer networks...
June 2017: Chaos
https://www.readbyqxmd.com/read/28667481/disrupted-topological-organization-of-brain-structural-network-associated-with-prior-overt-hepatic-encephalopathy-in-cirrhotic-patients
#9
Hua-Jun Chen, Hai-Bin Shi, Long-Feng Jiang, Lan Li, Rong Chen
OBJECTIVES: To investigate structural brain connectome alterations in cirrhotic patients with prior overt hepatic encephalopathy (OHE). METHODS: Seventeen cirrhotic patients with prior OHE (prior-OHE), 18 cirrhotic patients without prior OHE (non-prior-OHE) and 18 healthy controls (HC) underwent diffusion tensor imaging. Neurocognitive functioning was assessed with Psychometric Hepatic Encephalopathy Score (PHES). Using a probabilistic fibre tracking approach, we depicted the whole-brain structural network as a connectivity matrix of 90 regions (derived from the Automated Anatomic Labeling atlas)...
June 30, 2017: European Radiology
https://www.readbyqxmd.com/read/28665045/extraction-of-dynamic-functional-connectivity-from-brain-grey-matter-and-white-matter-for-mci-classification
#10
Xiaobo Chen, Han Zhang, Lichi Zhang, Celina Shen, Seong-Whan Lee, Dinggang Shen
Brain functional connectivity (FC) extracted from resting-state fMRI (RS-fMRI) has become a popular approach for diagnosing various neurodegenerative diseases, including Alzheimer's disease (AD) and its prodromal stage, mild cognitive impairment (MCI). Current studies mainly construct the FC networks between grey matter (GM) regions of the brain based on temporal co-variations of the blood oxygenation level-dependent (BOLD) signals, which reflects the synchronized neural activities. However, it was rarely investigated whether the FC detected within the white matter (WM) could provide useful information for diagnosis...
June 30, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28662061/ultra-high-field-upper-extremity-peripheral-nerve-and-non-contrast-enhanced-vascular-imaging
#11
Shailesh B Raval, Cynthia A Britton, Tiejun Zhao, Narayanan Krishnamurthy, Tales Santini, Vijay S Gorantla, Tamer S Ibrahim
OBJECTIVE: The purpose of this study was to explore the efficacy of Ultra-high field [UHF] 7 Tesla [T] MRI as compared to 3T MRI in non-contrast enhanced [nCE] imaging of structural anatomy in the elbow, forearm, and hand [upper extremity]. MATERIALS AND METHOD: A wide range of sequences including T1 weighted [T1] volumetric interpolate breath-hold exam [VIBE], T2 weighted [T2] double-echo steady state [DESS], susceptibility weighted imaging [SWI], time-of-flight [TOF], diffusion tensor imaging [DTI], and diffusion spectrum imaging [DSI] were optimized and incorporated with a radiofrequency [RF] coil system composed of a transverse electromagnetic [TEM] transmit coil combined with an 8-channel receive-only array for 7T upper extremity [UE] imaging...
2017: PloS One
https://www.readbyqxmd.com/read/28657774/integrative-structural-brain-network-analysis-in-diffusion-tensor-imaging
#12
Moo K Chung, Jamie L Hanson, Nagesh Adluru, Andrew L Alexander, Richard J Davidson, Seth D Pollak
In diffusion tensor imaging, structural connectivity between brain regions is often measured by the number of white matter fiber tracts connecting them. Other features such as the length of tracts or fractional anisotropy (FA) are also used in measuring the strength of connectivity. In this study, we investigated the effects of incorporating the number of tracts, the tract length, and FA values into the connectivity model. Using various node-degree-based graph theory features, the three connectivity models are compared...
June 28, 2017: Brain Connectivity
https://www.readbyqxmd.com/read/28650826/delayed-feedback-control-for-stabilization-of-boolean-control-networks-with-state-delay
#13
Rongjian Liu, Jianquan Lu, Yang Liu, Jinde Cao, Zheng-Guang Wu
In this brief, we study the delayed feedback stabilization problem for Boolean control networks (BCNs) with state delay. Using the semi-tensor product of matrices, some necessary and sufficient conditions are obtained. For the stabilization of BCNs, detailed procedure to construct the feedback controllers is also presented. We further derive the number of different feedback controllers, which can successfully stabilize the BCN in a finite time. Finally, an illustrative example is presented to show the effectiveness of our method...
June 22, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28649677/outcome-prediction-for-patient-with-high-grade-gliomas-from-brain-functional-and-structural-networks
#14
Luyan Liu, Han Zhang, Islem Rekik, Xiaobo Chen, Qian Wang, Dinggang Shen
High-grade glioma (HGG) is a lethal cancer, which is characterized by very poor prognosis. To help optimize treatment strategy, accurate preoperative prediction of HGG patient's outcome (i.e., survival time) is of great clinical value. However, there are huge individual variability of HGG, which produces a large variation in survival time, thus making prognostic prediction more challenging. Previous brain imaging-based outcome prediction studies relied only on the imaging intensity inside or slightly around the tumor, while ignoring any information that is located far away from the lesion (i...
October 2016: Medical Image Computing and Computer-assisted Intervention: MICCAI ..
https://www.readbyqxmd.com/read/28647657/distribution-and-network-of-basal-temporal-language-areas-a-study-of-the-combination-of-electric-cortical-stimulation-and-diffusion-tensor-imaging
#15
Rei Enatsu, Aya Kanno, Satoshi Ookawa, Satoko Ochi, Sumio Ishiai, Takashi Nagamine, Nobuhiro Mikuni
OBJECTIVE: The basal temporal language area (BTLA) is considered to have several functions in language processing; however, its brain network is still unknown. This study investigated the distribution and networks of the BTLA using a combination of electric cortical stimulation and diffusion tensor imaging (DTI). METHOD: Ten patients with intractable focal epilepsy who underwent presurgical evaluation with subdural electrodes were enrolled in this study (language dominant side: six patients, language non-dominant side: four patients)...
June 21, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28646350/abnormal-rich-club-organization-associated-with-compromised-cognitive-function-in-patients-with-schizophrenia-and-their-unaffected-parents
#16
Xin Zhao, Lin Tian, Jun Yan, Weihua Yue, Hao Yan, Dai Zhang
Schizophrenia is considered to be a disorder of brain connectivity, which might result from a disproportionally impaired rich-club organization. The rich-club is composed of highly interconnected hub regions that play crucial roles in integrating information between different brain regions. Few studies have yet investigated whether the structural rich-club organization is impaired in patients and their first-degree relatives. In this study, we established a weighted network model of white matter connections using diffusion tensor imaging of 19 patients and 39 unaffected parents, 22 young healthy controls for the patients, and 25 old healthy controls for the parents...
June 23, 2017: Neuroscience Bulletin
https://www.readbyqxmd.com/read/28640584/spectroscopic-evidence-for-a-h-bond-network-at-y356-located-at-the-subunit-interface-of-active-e-coli-ribonucleotide-reductase
#17
Thomas U Nick, Kanchana R Ravichandran, JoAnne Stubbe, Müge Kasanmascheff, Marina Bennati
The reaction catalyzed by E. coli ribonucleotide reductase (RNR) composed of α and β subunits that form an active α2β2 complex is a paradigm for proton-coupled electron transfer (PCET) processes in biological transformations. β2 contains the diferric tyrosyl radical (Y122·) cofactor that initiates radical transfer (RT) over 35 Å via a specific pathway of amino acids (Y122· ⇆ [W48] ⇆ Y356 in β2 to Y731 ⇆ Y730 ⇆ C439 in α2). Experimental evidence exists for colinear and orthogonal PCET in α2 and β2, respectively...
July 7, 2017: Biochemistry
https://www.readbyqxmd.com/read/28636614/smartphone-dependence-classification-using-tensor-factorization
#18
Jingyun Choi, Mi Jung Rho, Yejin Kim, In Hye Yook, Hwanjo Yu, Dai-Jin Kim, In Young Choi
Excessive smartphone use causes personal and social problems. To address this issue, we sought to derive usage patterns that were directly correlated with smartphone dependence based on usage data. This study attempted to classify smartphone dependence using a data-driven prediction algorithm. We developed a mobile application to collect smartphone usage data. A total of 41,683 logs of 48 smartphone users were collected from March 8, 2015, to January 8, 2016. The participants were classified into the control group (SUC) or the addiction group (SUD) using the Korean Smartphone Addiction Proneness Scale for Adults (S-Scale) and a face-to-face offline interview by a psychiatrist and a clinical psychologist (SUC = 23 and SUD = 25)...
2017: PloS One
https://www.readbyqxmd.com/read/28628946/structural-plasticity-of-the-ventral-stream-and-aphasia-recovery
#19
Emilie T McKinnon, Julius Fridriksson, G Russell Glenn, Jens H Jensen, Joseph A Helpern, Alexandra Basilakos, Christopher Rorden, Andy Y Shih, M Vittoria Spampinato, Leonardo Bonilha
Re-strengthening of the residual language network is likely crucial for speech recovery in post-stroke aphasia. Eight participants with chronic aphasia received intensive speech therapy for three weeks, with standardized naming tests and brain MRIs before and after therapy. Kurtosis-based diffusion tensor tractography was used to measure mean kurtosis (MK) along a segment of the inferior longitudinal fasciculus (ILF). Therapy related reduction in the number of semantic but not phonemic errors was associated with strengthening (renormalization) of ILF MK (r=-0...
June 19, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28596117/disrupted-white-matter-structural-networks-in-healthy-older-adult-apoe-%C3%AE%C2%B54-carriers-an-international-multicenter-dti-study
#20
Enrica Cavedo, Simone Lista, Katrine Rojkova, Patrizia A Chiesa, Marion Houot, Katharina Brueggen, Janusch Blautzik, Arun L W Bokde, Bruno Dubois, Frederik Barkhof, Petra J W Pouwels, Stefan Teipel, Harald Hampel
The ε4 allelic variant of the Apolipoprotein E gene (APOE ε4) is the best-established genetic risk factor for late-onset Alzheimer's disease (AD). White matter (WM) microstructural damages measured with Diffusion Tensor Imaging (DTI) represent an early sign of fiber tract disconnection in AD. We examined the impact of APOE ε4 on WM microstructure in elderly individuals from the multicenter European DTI Study on Dementia. Voxelwise statistical analysis of fractional anisotropy (FA), mean diffusivity, radial and axial diffusivity (MD, radD and axD respectively) was carried out using Tract-Based Spatial Statistics...
June 6, 2017: Neuroscience
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"