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https://www.readbyqxmd.com/read/28209314/connection-between-bilateral-temporal-regions-tractography-using-human-connectome-data-and-diffusion-spectrum-imaging
#1
Peng-Hu Wei, Zhi-Qi Mao, Fei Cong, Bo Wang, Zhi-Pei Ling, Shu-Li Liang, Xin-Guang Yu
Temporal lobe epilepsy often propagates inter-hemispherically. Although the pathway of the propagation was verified by electrophysiology, the trajectory remains poorly defined. DTI can depict fiber trajectory but it has limited angular resolution and cannot adequately assess cortical regions. We visualized potential pathways of bitemporal epilepsy propagation using diffusion spectrum imaging (DSI) with data consisting of 8 groups of 514 directions and diffusion templates of 842 subjects from the human connectome project (HCP)...
February 10, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28209179/the-social-brain-network-in-22q11-2-deletion-syndrome-a-diffusion-tensor-imaging-study
#2
Amy K Olszewski, Zora Kikinis, Christie S Gonzalez, Ioana L Coman, Nikolaos Makris, Xue Gong, Yogesh Rathi, Anni Zhu, Kevin M Antshel, Wanda Fremont, Marek R Kubicki, Sylvain Bouix, Martha E Shenton, Wendy R Kates
BACKGROUND: Chromosome 22q11.2 deletion syndrome (22q11.2DS) is a neurogenetic disorder that is associated with a 25-fold increase in schizophrenia. Both individuals with 22q11.2DS and those with schizophrenia present with social cognitive deficits, which are putatively subserved by a network of brain regions that are involved in the processing of social cognitive information. This study used two-tensor tractography to examine the white matter tracts believed to underlie the social brain network in a group of 57 young adults with 22q11...
February 16, 2017: Behavioral and Brain Functions: BBF
https://www.readbyqxmd.com/read/28207659/evaluation-of-dti-parameter-ratios-and-diffusion-tensor-tractography-grading-in-the-diagnosis-and-prognosis-prediction-of-cervical-spondylotic-myelopathy
#3
Kun Wang, Zhi Chen, Fan Zhang, Qingxin Song, Canglong Hou, Yixing Tang, Jun Wang, Shiyue Chen, Yun Bian, Qiang Hao, Hongxing Shen
STUDY DESIGN: Prospective cohort. OBJECTIVE: To explore the correlations between diffusion tensor imaging (DTI) ratios and diffusion tensor tractography (DTT) grading with clinical symptoms and outcomes of cervical spondylotic myelopathy (CSM). SUMMARY OF BACKGROUND DATA: In addition to magnetic resonance imaging (MRI) and computed tomography, DTI may be useful in understanding pathophysiology of spinal cord in earlier stages of the CSM but it may be confounded by age and cervical level, and previous studies had small sample sizes...
February 15, 2017: Spine
https://www.readbyqxmd.com/read/28207526/restoration-of-the-ascending-reticular-activating-system-compressed-by-hematoma-in-a-stroke-patient
#4
Sung Ho Jang, Jeong Pyo Seo
RATIONALE: We report on restoration of the ascending reticular activating system (ARAS), compressed by an intracerebral hematoma and perihematomal edema following a stroke. The restoration of the ARAS was demonstrated by diffusion tensor tractography (DTT). PATIENT CONCERNS: In a 60-year-old male, a brain MRI taken at 2 weeks after the surgery showed a hematoma and perihematomal edema in the left posterolateral pons and cerebellum, which were markedly resolved on a brain MRI after 5 weeks...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28205341/spatiotemporal-microstructural-white-matter-changes-in-diffusion-tensor-imaging-after-transient-focal-ischemic-stroke-in-rats
#5
Won-Beom Jung, Yong Hee Han, Julius Juhyun Chung, Sun Young Chae, Sung Hoon Lee, Geun Ho Im, JiHoon Cha, Jung Hee Lee
Structural reorganization in white matter (WM) after stroke is a potential contributor to substitute or to newly establish the functional field on the injured brain in nature. Diffusion tensor imaging (DTI) is an imaging modality that can be used to evaluate damage and recovery within the brain. This method of imaging allows for in vivo assessment of the restricted movements of water molecules in WM and provides a detailed look at structural connectivity in the brain. For longitudinal DTI studies after a stroke, the conventional region of interest method and voxel-based analysis are highly dependent on the user-hypothesis and parameter settings for implementation...
February 16, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28196374/the-visual-white-matter-the-application-of-diffusion-mri-and-fiber-tractography-to-vision-science
#6
Ariel Rokem, Hiromasa Takemura, Andrew S Bock, K Suzanne Scherf, Marlene Behrmann, Brian A Wandell, Ione Fine, Holly Bridge, Franco Pestilli
Visual neuroscience has traditionally focused much of its attention on understanding the response properties of single neurons or neuronal ensembles. The visual white matter and the long-range neuronal connections it supports are fundamental in establishing such neuronal response properties and visual function. This review article provides an introduction to measurements and methods to study the human visual white matter using diffusion MRI. These methods allow us to measure the microstructural and macrostructural properties of the white matter in living human individuals; they allow us to trace long-range connections between neurons in different parts of the visual system and to measure the biophysical properties of these connections...
February 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28195241/brain-fingerprints-of-olfaction-a-novel-structural-method-for-assessing-olfactory-cortical-networks-in-health-and-disease
#7
A Fjaeldstad, H M Fernandes, T J Van Hartevelt, C Gleesborg, A Møller, T Ovesen, M L Kringelbach
Olfactory deficits are a common (often prodromal) symptom of neurodegenerative or psychiatric disorders. As such, olfaction could have great potential as an early biomarker of disease, for example using neuroimaging to investigate the breakdown of structural connectivity profile of the primary olfactory networks. We investigated the suitability for this purpose in two existing neuroimaging maps of olfactory networks. We found problems with both existing neuroimaging maps in terms of their structural connectivity to known secondary olfactory networks...
February 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28194829/diffusion-tensor-imaging-of-the-anterior-cruciate-ligament-graft
#8
Pieter Van Dyck, Martijn Froeling, Eline De Smet, Pim Pullens, Michaël Torfs, Peter Verdonk, Jan Sijbers, Paul M Parizel, Ben Jeurissen
PURPOSE: A great need exists for objective biomarkers to assess graft healing following ACL reconstruction to guide the time of return to sports. The purpose of this study was to evaluate the feasibility and reliability of diffusion tensor imaging (DTI) to delineate the anterior cruciate ligament (ACL) graft and to investigate its diffusion properties using a clinical 3T scanner. MATERIALS AND METHODS: DTI of the knee (b = 0, 400, and 800 s/mm(2) , 10 diffusion directions, repeated 16 times for a total of 336 diffusion-weighted volumes) was performed at 3T in 17 patients between 3 and 7 months (mean, 4 months) following ACL reconstruction...
February 14, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28188985/3d-ssf-a-bio-inspired-approach-for-dynamic-multi-subject-clustering-of-white-matter-tracts
#9
REVIEW
A Chekir, S Hassas, M Descoteaux, M Côté, E Garyfallidis, F Oulebsir-Boumghar
There is growing interest in the study of white matter (WM) variation across subjects, and in particular the analysis of specific WM bundles, to better understand brain development and aging, as well as to improve early detection of some diseases. Several WM multi-subject clustering methods have been proposed to study WM bundles. These methods aim to overcome the complexity of the problem, which includes the huge size of the WM tractography datasets generated from multiple subjects, the existence of various streamlines with different positions, lengths and geometric forms, as well as the presence of outliers...
January 27, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28186667/thalamocortical-dysconnectivity-in-paroxysmal-kinesigenic-dyskinesia-combining-functional-magnetic-resonance-imaging-and-diffusion-tensor-imaging
#10
Zhiliang Long, Qiang Xu, Huan-Huan Miao, Yang Yu, Mei-Ping Ding, Huafu Chen, Zhi-Rong Liu, Wei Liao
BACKGROUND: Paroxysmal kinesigenic dyskinesia is associated with macrostructural and microstructural abnormalities in the thalamus. OBJECTIVES: To examine functional and structural connectivity of thalamocortical networks in paroxysmal kinesigenic dyskinesia and to further investigate the effect of mutation of the proline-rich transmembrane protein 2 on thalamocortical networks. METHODS: Patients with paroxysmal kinesigenic dyskinesia (n = 20), subdivided into proline-rich transmembrane protein 2-mutated (n = 8) and nonmutated patients (n = 12) and healthy controls (n = 20) underwent resting-state functional MRI and diffusion imaging scan...
February 10, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28176425/sensory-tractography-and-robot-quantified-proprioception-in-hemiparetic-children-with-perinatal-stroke
#11
Andrea M Kuczynski, Helen L Carlson, Catherine Lebel, Jacquie A Hodge, Sean P Dukelow, Jennifer A Semrau, Adam Kirton
Perinatal stroke causes most hemiparetic cerebral palsy, resulting in lifelong disability. We have demonstrated the ability of robots to quantify sensory dysfunction in hemiparetic children but the relationship between such deficits and sensory tract structural connectivity has not been explored. It was aimed to characterize the relationship between the dorsal column medial lemniscus (DCML) pathway connectivity and proprioceptive dysfunction in children with perinatal stroke. Twenty-nine participants (6-19 years old) with MRI-classified, unilateral perinatal ischemic stroke (14 arterial, 15 venous), and upper extremity deficits were recruited from a population-based cohort and compared with 21 healthy controls...
February 8, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28175893/evaluation-of-diffusion-tensor-imaging-based-tractography-of-the-corticospinal-tract-a-correlative-study-with-intraoperative-magnetic-resonance-imaging-and-direct-electrical-subcortical-stimulation
#12
Seyed A Javadi, Arya Nabavi, Mario Giordano, Elham Faghihzadeh, Amir Samii
No abstract text is available yet for this article.
February 1, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28175550/205%C3%A2-tractography-characterizing-lesions-differentiating-responders-to-stereotactic-capsulotomy-for-obsessive-compulsive-disorder
#13
Pranav Nanda, Garrett P Banks, Yagna Pathak, Danika L Paulo, Guillermo Horga, Marcelo Q Hoexter, Zhiyuan Xu, Antonio Lopes, Nicole McLaughlin, Benjamin Greenberg, Jason P Sheehan, Euripides C Miguel, Sameer A Sheth
No abstract text is available yet for this article.
August 1, 2016: Neurosurgery
https://www.readbyqxmd.com/read/28168210/white-matter-predicts-functional-connectivity-in-premanifest-huntington-s-disease
#14
Peter McColgan, Sarah Gregory, Adeel Razi, Kiran K Seunarine, Fatma Gargouri, Alexandra Durr, Raymund A C Roos, Blair R Leavitt, Rachael I Scahill, Chris A Clark, Sarah J Tabrizi, Geraint Rees, A Coleman, J Decolongon, M Fan, T Petkau, C Jauffret, D Justo, S Lehericy, K Nigaud, R Valabrègue, A Choonderbeek, E P T Hart, D J Hensman Moss, H Crawford, E Johnson, M Papoutsi, C Berna, R Reilmann, N Weber, J Stout, I Labuschagne, B Landwehrmeyer, M Orth, H Johnson
OBJECTIVES: The distribution of pathology in neurodegenerative disease can be predicted by the organizational characteristics of white matter in healthy brains. However, we have very little evidence for the impact these pathological changes have on brain function. Understanding any such link between structure and function is critical for understanding how underlying brain pathology influences the progressive behavioral changes associated with neurodegeneration. Here, we demonstrate such a link between structure and function in individuals with premanifest Huntington's...
February 2017: Annals of Clinical and Translational Neurology
https://www.readbyqxmd.com/read/28157545/a-comparison-of-structural-connectivity-in-anxious-depression-versus-non-anxious-depression
#15
Lauren Delaparte, Fang-Cheng Yeh, Phil Adams, Ashley Malchow, Madhukar H Trivedi, Maria A Oquendo, Thilo Deckersbach, Todd Ogden, Diego A Pizzagalli, Maurizio Fava, Crystal Cooper, Melvin McInnis, Benji T Kurian, Myrna M Weissman, Patrick J McGrath, Daniel N Klein, Ramin V Parsey, Christine DeLorenzo
BACKGROUND: Major depressive disorder (MDD) and anxiety disorders are highly co-morbid. Research has shown conflicting evidence for white matter alteration and amygdala volume reduction in mood and anxiety disorders. To date, no studies have examined differences in structural connectivity between anxious depressed and non-anxious depressed individuals. This study compared fractional anisotropy (FA) and density of selected white matter tracts and amygdala volume between anxious depressed and non-anxious depressed individuals...
January 24, 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/28156202/diffusion-tensor-imaging-of-the-physes-a-possible-biomarker-for-skeletal-growth-experience-with-151-children
#16
Maria A Bedoya, Jorge Delgado, Jeffrey I Berman, Nancy A Chauvin, David Zurakowski, Raul Ramirez-Grueso, Aikaterini Ntoulia, Diego Jaramillo
Purpose To determine the changes of diffusion-tensor imaging (DTI) and tractography in the distal femur and proximal tibia related to age, sex, and height. Materials and Methods Following institutional review board approval, with waiver of consent and with HIPAA compliance, the authors retrospectively analyzed DTI images of the knee in 151 children, 73 girls (median age, 14.1 years; range, 6.5-17.8 years) and 78 boys (median age, 16.6 years; range, 6.9-17.9 years), studied from January 2013 to October 2014...
February 2, 2017: Radiology
https://www.readbyqxmd.com/read/28154150/structural-and-functional-cortical-connectivity-mediating-cross-education-of-motor-function
#17
Kathy L Ruddy, Alexander Leemans, Daniel G Woolley, Nicole Wenderoth, Richard G Carson
: Cross Education is the process whereby training with one limb leads to subsequent improvement in performance by the opposite untrained limb. We used multimodal neuroimaging in humans to investigate the mediating neural mechanisms by relating quantitative estimates of functional and structural cortical connectivity to individual levels of interlimb transfer. Resting-state (rs)-fMRI and Diffusion Weighted Imaging (DWI) scans were undertaken prior to unilateral ballistic wrist flexion training...
February 2, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28153637/early-development-of-structural-networks-and-the-impact-of-prematurity-on-brain-connectivity
#18
Dafnis Batalle, Emer J Hughes, Hui Zhang, J-Donald Tournier, Nora Tusor, Paul Aljabar, Luqman Wali, Daniel C Alexander, Joseph V Hajnal, Chiara Nosarti, A David Edwards, Serena J Counsell
Preterm infants are at high risk of neurodevelopmental impairment, which may be due to altered development of brain connectivity. We aimed to (i) assess structural brain development from 25 to 45 weeks gestational age (GA) using graph theoretical approaches and (ii) test the hypothesis that preterm birth results in altered white matter network topology. Sixty-five infants underwent MRI between 25(+3) and 45(+6) weeks GA. Structural networks were constructed using constrained spherical deconvolution tractography and were weighted by measures of white matter microstructure (fractional anisotropy, neurite density and orientation dispersion index)...
January 30, 2017: NeuroImage
https://www.readbyqxmd.com/read/28153623/dti-tractography-detecting-isolated-oculomotor-nerve-damage-after-brain-traumatic-injury
#19
Timothée Jacquesson, Carole Frindel, Francois Cotton
No abstract text is available yet for this article.
January 30, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28152253/diffusion-tensor-imaging-of-the-human-calf-variation-of-inter-and-intramuscle-specific-diffusion-parameters
#20
Lara Schlaffke, Robert Rehmann, Martijn Froeling, Rudolf Kley, Martin Tegenthoff, Matthias Vorgerd, Tobias Schmidt-Wilcke
PURPOSE: To investigate to what extent inter- and intramuscular variations of diffusion parameters of human calf muscles can be explained by age, gender, muscle location, and body mass index (BMI) in a specific age group (20-35 years). MATERIALS AND METHODS: Whole calf muscles of 18 healthy volunteers were evaluated. Magnetic resonance imaging (MRI) was performed using a 3T scanner and a 16-channel Torso XL coil. Diffusion-weighted images were acquired to perform fiber tractography and diffusion tensor imaging (DTI) analysis for each muscle of both legs...
February 2, 2017: Journal of Magnetic Resonance Imaging: JMRI
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