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https://www.readbyqxmd.com/read/28731515/analysis-of-structure-function-network-decoupling-in-the-brain-systems-of-spastic-diplegic-cerebral-palsy
#1
Dongha Lee, Chongwon Pae, Jong Doo Lee, Eun Sook Park, Sung-Rae Cho, Min-Hee Um, Seung-Koo Lee, Maeng-Keun Oh, Hae-Jeong Park
Manifestation of the functionalities from the structural brain network is becoming increasingly important to understand a brain disease. With the aim of investigating the differential structure-function couplings according to network systems, we investigated the structural and functional brain networks of patients with spastic diplegic cerebral palsy with periventricular leukomalacia compared to healthy controls. The structural and functional networks of the whole brain and motor system, constructed using deterministic and probabilistic tractography of diffusion tensor magnetic resonance images and Pearson and partial correlation analyses of resting-state functional magnetic resonance images, showed differential embedding of functional networks in the structural networks in patients...
July 21, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28730570/structural-connectivity-differences-in-essential-tremor-with-and-without-resting-tremor
#2
Maria Eugenia Caligiuri, Gennarina Arabia, Gaetano Barbagallo, Angela Lupo, Maurizio Morelli, Rita Nisticò, Fabiana Novellino, Andrea Quattrone, Maria Salsone, Basilio Vescio, Andrea Cherubini, Aldo Quattrone
In this work, we investigated motor network structure in patients affected by essential tremor (ET) with or without resting tremor, using probabilistic tractography of the cerebello-thalamo-basal ganglia-cortical loop. Twenty-five patients with ET, twenty-two patients with ET associated with resting tremor (rET), and twenty-five age- and sex-matched healthy controls were included in the study. All participants underwent whole-brain 3D T1-weighted and diffusion-weighted MRI, and DAT-SPECT. Probabilistic tractography was performed on diffusion data in network mode, reconstructing connections between the different structures of the cerebello-thalamo-basal ganglia-cortical loop...
July 20, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28725550/dti-measures-identify-mild-and-moderate-tbi-cases-among-patients-with-complex-health-problems-a-receiver-operating-characteristic-analysis-of-u-s-veterans
#3
Keith L Main, Salil Soman, Franco Pestilli, Ansgar Furst, Art Noda, Beatriz Hernandez, Jennifer Kong, Jauhtai Cheng, Jennifer K Fairchild, Joy Taylor, Jerome Yesavage, J Wesson Ashford, Helena Kraemer, Maheen M Adamson
Standard MRI methods are often inadequate for identifying mild traumatic brain injury (TBI). Advances in diffusion tensor imaging now provide potential biomarkers of TBI among white matter fascicles (tracts). However, it is still unclear which tracts are most pertinent to TBI diagnosis. This study ranked fiber tracts on their ability to discriminate patients with and without TBI. We acquired diffusion tensor imaging data from military veterans admitted to a polytrauma clinic (Overall n = 109; Age: M = 47...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28725549/performance-of-unscented-kalman-filter-tractography-in-edema-analysis-of-the-two-tensor-model
#4
Ruizhi Liao, Lipeng Ning, Zhenrui Chen, Laura Rigolo, Shun Gong, Ofer Pasternak, Alexandra J Golby, Yogesh Rathi, Lauren J O'Donnell
Diffusion MRI tractography is increasingly used in pre-operative neurosurgical planning to visualize critical fiber tracts. However, a major challenge for conventional tractography, especially in patients with brain tumors, is tracing fiber tracts that are affected by vasogenic edema, which increases water content in the tissue and lowers diffusion anisotropy. One strategy for improving fiber tracking is to use a tractography method that is more sensitive than the traditional single-tensor streamline tractography...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28724360/injury-of-ascending-reticular-activating-system-associated-with-delayed-post-hypoxic-leukoencephalopathy-a-case-report
#5
Sung Ho Jang, Hyeok Gyu Kwon
BACKGROUND: Delayed post-hypoxic leukoencephalopathy (DPHL) is a demyelinating syndrome characterized by neurological relapse after an initial recovery from hypoxic brain injury. We describe a patient with impaired consciousness following DPHL, concurrent with injury of the ascending reticular activating system (ARAS) shown using diffusion tensor tractography (DTT). CASE PRESENTATION: A 50-year-old male patient was in a drowsy mental state after exposure to carbon monoxide (CO) for about ten hours...
July 19, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28723747/injury-of-optic-radiation-and-visual-field-defect-in-a-patient-with-aneurysmal-subarachnoid-hemorrhage-a-case-report
#6
Sung Ho Jang, Jeong Pyo Seo
RATIONALE: Little is known about optic radiation (OR) injury following aneurysmal subarachnoid hemorrhage (SAH). In the current study, we report on a patient who showed a visual field defect and injury of the OR following aneurysmal SAH, using diffusion tensor tractography (DTT). PATIENT CONCERNS: At 4 weeks from onset, when a 62-year old female started rehabilitation, she complained of a visual field defect. Peripheral field defects were detected on both eyes using the Humphrey visual field test...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28721443/a-diffusion-spectrum-imaging-based-tractographic-study-into-the-anatomical-subdivision-and-cortical-connectivity-of-the-ventral-external-capsule-uncinate-and-inferior-fronto-occipital-fascicles
#7
Sandip S Panesar, Fang-Cheng Yeh, Christopher P Deibert, David Fernandes-Cabral, Vijayakrishna Rowthu, Pinar Celtikci, Emrah Celtikci, William D Hula, Sudhir Pathak, Juan C Fernández-Miranda
PURPOSE: The inferior fronto-occipital fasciculus (IFOF) and uncinate fasciculus (UF) are major fronto-capsular white matter pathways. IFOF connects frontal areas of the brain to parieto-occipital areas. UF connects ventral frontal areas to anterior temporal areas. Both fascicles are thought to subserve higher language and emotion roles. Controversy pertaining to their connectivity and subdivision persists in the literature, however. METHODS: High-definition fiber tractography (HDFT) is a non-tensor tractographic method using diffusion spectrum imaging data...
July 18, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28716716/fiber-tractography-using-machine-learning
#8
Peter F Neher, Marc-Alexandre Côté, Jean-Christophe Houde, Maxime Descoteaux, Klaus H Maier-Hein
We present a fiber tractography approach based on a random forest classification and voting process, guiding each step of the streamline progression by directly processing raw diffusion-weighted signal intensities. For comparison to the state-of-the-art, i.e. tractography pipelines that rely on mathematical modeling, we performed a quantitative and qualitative evaluation with multiple phantom and in vivo experiments, including a comparison to the 96 submissions of the ISMRM tractography challenge 2015. The results demonstrate the vast potential of machine learning for fiber tractography...
July 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28712994/recognition-of-white-matter-bundles-using-local-and-global-streamline-based-registration-and-clustering
#9
REVIEW
Eleftherios Garyfallidis, Marc-Alexandre Côté, Francois Rheault, Jasmeen Sidhu, Janice Hau, Laurent Petit, David Fortin, Stephen Cunanne, Maxime Descoteaux
Virtual dissection of diffusion MRI tractograms is cumbersome and needs extensive knowledge of white matter anatomy. This virtual dissection often requires several inclusion and exclusion regions-of-interest that make it a process that is very hard to reproduce across experts. Having automated tools that can extract white matter bundles for tract-based studies of large numbers of people is of great interest for neuroscience and neurosurgical planning. The purpose of our proposed method, named RecoBundles, is to segment white matter bundles and make virtual dissection easier to perform...
July 13, 2017: NeuroImage
https://www.readbyqxmd.com/read/28711737/subthalamic-deep-brain-stimulation-sweet-spots-and-hyperdirect-cortical-connectivity-in-parkinson-s-disease
#10
Harith Akram, Stamatios N Sotiropoulos, Saad Jbabdi, Dejan Georgiev, Philipp Mahlknecht, Jonathan Hyam, Thomas Foltynie, Patricia Limousin, Enrico De Vita, Marjan Jahanshahi, Marwan Hariz, John Ashburner, Tim Behrens, Ludvic Zrinzo
OBJECTIVES: Firstly, to identify subthalamic region stimulation clusters that predict maximum improvement in rigidity, bradykinesia and tremor, or emergence of side-effects; and secondly, to map-out the cortical fingerprint, mediated by the hyperdirect pathways which predict maximum efficacy. METHODS: High angular resolution diffusion imaging in twenty patients with advanced Parkinson's disease was acquired prior to bilateral subthalamic nucleus deep brain stimulation...
July 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28710907/distinct-contributions-of-the-fornix-and-inferior-longitudinal-fasciculus-to-episodic-and-semantic-autobiographical-memory
#11
Carl J Hodgetts, Mark Postans, Naomi Warne, Alice Varnava, Andrew D Lawrence, Kim S Graham
Autobiographical memory (AM) is multifaceted, incorporating the vivid retrieval of contextual detail (episodic AM), together with semantic knowledge that infuses meaning and coherence into past events (semantic AM). While neuropsychological evidence highlights a role for the hippocampus and anterior temporal lobe (ATL) in episodic and semantic AM, respectively, it is unclear whether these constitute dissociable large-scale AM networks. We used high angular resolution diffusion-weighted imaging and constrained spherical deconvolution-based tractography to assess white matter microstructure in 27 healthy young adult participants who were asked to recall past experiences using word cues...
June 20, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28710324/brain-white-matter-fibre-tracts-a-review-of-functional-neuro-oncological-relevance
#12
REVIEW
Natalie L Voets, Andreas Bartsch, Puneet Plaha
State-of-the-art glioma treatment aims to maximise neuro-oncological benefit while minimising losses in quality of life. Optimising this balance remains hindered by our still limited understanding of information processing in the human brain. To help understand individual differences in functional outcomes following neuro-oncological treatment, we review mounting evidence demonstrating the fundamental role that white matter connections play in complex human behaviour. We focus on selected fibre tracts whose destruction is recognised to elicit predictable behavioural deficits and consider specific indications for non-invasive diffusion MRI tractography, the only existing method to map these fibre tracts in vivo, in the selection and planning of neuro-oncological treatments...
July 14, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28710000/the-perisylvian-language-network-and-language-analytical-abilities
#13
Olga Kepinska, Egbert A J F Lakke, Eleanor M Dutton, Johanneke Caspers, Niels O Schiller
Aiming at exploring the brain's structural organisation underlying successful second language learning, we investigate the anatomy of the perisylvian language network in a group of healthy adults, consisting of participants with high and average language analytical abilities. Utilising deterministic tractography, six tracts per participant (left and right long direct segment, left and right indirect anterior segment and left and right indirect posterior segment) were virtually dissected and measurements pertaining to their microstructural organisation were collected...
July 11, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28708864/abnormal-lateralization-of-fine-motor-actions-in-tourette-syndrome-persists-into-adulthood
#14
D Martino, C Delorme, E Pelosin, A Hartmann, Y Worbe, L Avanzino
Youth with Tourette syndrome (TS) exhibit, compared to healthy, abnormal ability to lateralize digital sequential tasks. It is unknown whether this trait is related to inter-hemispheric connections, and whether it is preserved or lost in patients with TS persisting through adult life. We studied 13 adult TS patients and 15 age-matched healthy volunteers. All participants undertook: 1) a finger opposition task, performed with the right hand (RH) only or with both hands, using a sensor-engineered glove in synchrony with a metronome at 2 Hz; we calculated a lateralization index [(single RH-bimanual RH)/single RH X 100) for percentage of correct movements (%CORR); 2) MRI-based diffusion tensor imaging and probabilistic tractography of inter-hemispheric corpus callosum (CC) connections between supplementary motor areas (SMA) and primary motor cortices (M1)...
2017: PloS One
https://www.readbyqxmd.com/read/28702348/predicting-pain-relief-use-of-pre-surgical-trigeminal-nerve-diffusion-metrics-in-trigeminal-neuralgia
#15
Peter S-P Hung, David Q Chen, Karen D Davis, Jidan Zhong, Mojgan Hodaie
Trigeminal neuralgia (TN) is a chronic neuropathic facial pain disorder that commonly responds to surgery. A proportion of patients, however, do not benefit and suffer ongoing pain. There are currently no imaging tools that permit the prediction of treatment response. To address this paucity, we used diffusion tensor imaging (DTI) to determine whether pre-surgical trigeminal nerve microstructural diffusivities can prognosticate response to TN treatment. In 31 TN patients and 16 healthy controls, multi-tensor tractography was used to extract DTI-derived metrics-axial (AD), radial (RD), mean diffusivity (MD), and fractional anisotropy (FA)-from the cisternal segment, root entry zone and pontine segment of trigeminal nerves for false discovery rate-corrected Student's t-tests...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28701996/aberrant-pyramidal-tract-in-comparison-with-pyramidal-tract-on-diffusion-tensor-tractography-a-mini-review
#16
REVIEW
Sungho Jang, Soyoung Kwak
The pyramidal tract (PT) is a major neural tract that controls voluntary movements in the human brain. The PT has several collateral pathways, including the aberrant pyramidal tract (APT), which passes through the medial lemniscus location at the midbrain and pons. Diffusion tensor tractography (DTT) allows visualization and estimation of the APT in three dimensions. In this mini-review, eight DTT studies on the APT were reviewed. Two studies for normal subjects reported the prevalence (17-18% of hemispheres) and the different characteristics (different cortical origin, less directionality, and fewer neural fibers) of the APT compared with the PT...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28699372/hemispheric-asymmetries-in-dorsal-language-pathway-white-matter-tracts-a-magnetic-resonance-imaging-tractography-and-functional-magnetic-resonance-imaging-study
#17
Guilherme Silva, Alberto Citterio
Introduction Previous studies have shown that the arcuate fasciculus has a leftward asymmetry in right-handers that could be correlated with the language lateralisation defined by functional magnetic resonance imaging. Nonetheless, information about the asymmetry of the other fibres that constitute the dorsal language pathway is scarce. Objectives This study investigated the asymmetry of the white-matter tracts involved in the dorsal language pathway through the diffusion tensor imaging (DTI) technique, in relation to language hemispheric dominance determined by task-dependent functional magnetic resonance imaging (fMRI)...
January 1, 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28698090/the-superior-frontal-transsulcal-approach-to-the-anterior-ventricular-system-exploring-the-sulcal-and-subcortical-anatomy-using-anatomic-dissections-and-dti-tractography
#18
Christos Koutsarnakis, Faidon Liakos, Aristotelis V Kalyvas, Georgios P Skandalakis, Spyros Komaitis, Fotini Christidi, Efstratios Karavasilis, Evangellia Liouta, George Stranjalis
OBJECTIVE: To explore the superior frontal sulcus morphology, trajectory of the applied surgical corridor and white matter bundles that are traversed during the superior frontal transsulcal transventricular approach METHODS: Twenty (20) normal, adult, formalin-fixed cerebral hemispheres and two (2) cadaveric heads were included in the study. The superior frontal sulcus (SFS) topography, morphology and dimensions were recorded in all specimens. Fourteen (14) hemispheres were investigated through the fiber dissection technique while the remaining six (6) were explored using coronal cuts...
July 8, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28695417/a-fiber-tractography-study-of-social-emotional-related-fiber-tracts-in-children-and-adolescents-with-autism-spectrum-disorder
#19
Yun Li, Hui Fang, Wenming Zheng, Lu Qian, Yunhua Xiao, Qiaorong Wu, Chen Chang, Chaoyong Xiao, Kangkang Chu, Xiaoyan Ke
The symptoms of autism spectrum disorder (ASD) have been hypothesized to be caused by changes in brain connectivity. From the clinical perspective, the "disconnectivity" hypothesis has been used to explain characteristic impairments in "socio-emotional" function. Therefore, in this study we compared the facial emotional recognition (FER) feature and the integrity of social-emotional-related white-matter tracts between children and adolescents with high-functioning ASD (HFA) and their typically developing (TD) counterparts...
July 10, 2017: Neuroscience Bulletin
https://www.readbyqxmd.com/read/28695358/retained-executive-abilities-in-mild-cognitive-impairment-are-associated-with-increased-white-matter-network-connectivity
#20
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
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