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https://www.readbyqxmd.com/read/27913428/migration-pathways-of-thalamic-neurons-and-development-of-thalamocortical-connections-in-humans-revealed-by-diffusion-mr-tractography
#1
Molly Wilkinson, Tara Kane, Rongpin Wang, Emi Takahashi
The thalamus plays an important role in signal relays in the brain, with thalamocortical (TC) neuronal pathways linked to various sensory/cognitive functions. In this study, we aimed to see fetal and postnatal development of the thalamus including neuronal migration to the thalamus and the emergence/maturation of the TC pathways. Pathways from/to the thalami of human postmortem fetuses and in vivo subjects ranging from newborns to adults with no neurological histories were studied using high angular resolution diffusion MR imaging (HARDI) tractography...
December 2, 2016: Cerebral Cortex
https://www.readbyqxmd.com/read/27903188/the-role-of-diffusion-tensor-imaging-tractography-for-gamma-knife-thalamotomy-planning
#2
João Gabriel Ribeiro Gomes, Alessandra Augusta Gorgulho, Amanda de Oliveira López, Crystian Wilian Chagas Saraiva, Lucas Petri Damiani, Anderson Martins Pássaro, João Victor Salvajoli, Ludmila de Oliveira Siqueira, Bernardo Peres Salvajoli, Antônio Afonso Ferreira De Salles
OBJECTIVE The role of tractography in Gamma Knife thalamotomy (GK-T) planning is still unclear. Pyramidal tractography might reduce the risk of radiation injury to the pyramidal tract and reduce motor complications. METHODS In this study, the ventralis intermedius nucleus (VIM) targets of 20 patients were bilaterally defined using Iplannet Stereotaxy Software, according to the anterior commissure-posterior commissure (AC-PC) line and considering the localization of the pyramidal tract. The 40 targets and tractography were transferred as objects to the GammaPlan Treatment Planning System (GP-TPS)...
December 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27903187/stereotactic-diffusion-tensor-imaging-tractography-for-gamma-knife-radiosurgery
#3
Cormac G Gavin, H Ian Sabin
OBJECTIVE The integration of modern neuroimaging into treatment planning has increased the therapeutic potential and safety of stereotactic radiosurgery. The authors report their method of integrating stereotactic diffusion tensor imaging (DTI) tractography into conventional treatment planning for Gamma Knife radiosurgery (GKRS). The aim of this study was to demonstrate the feasibility of this technique and to address some of the technical limitations of previously reported techniques. METHODS Twenty patients who underwent GKRS composed the study cohort...
December 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27901100/imaging-analysis-of-parkinson-s-disease-patients-using-spect-and-tractography
#4
Seong-Jin Son, Mansu Kim, Hyunjin Park
Parkinson's disease (PD) is a degenerative disorder that affects the central nervous system. PD-related alterations in structural and functional neuroimaging have not been fully explored. This study explored multi-modal PD neuroimaging and its application for predicting clinical scores on the Movement Disorder Society-sponsored Unified Parkinson's Disease Rating Scale (MDS-UPDRS). Multi-modal imaging that combined (123)I-Ioflupane single-photon emission computed tomography (SPECT) and diffusion tensor imaging (DTI) were adopted to incorporate complementary brain imaging information...
November 30, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27892534/improving-estimation-of-fiber-orientations-in-diffusion-mri-using-inter-subject-information-sharing
#5
Geng Chen, Pei Zhang, Ke Li, Chong-Yaw Wee, Yafeng Wu, Dinggang Shen, Pew-Thian Yap
Diffusion magnetic resonance imaging is widely used to investigate diffusion patterns of water molecules in the human brain. It provides information that is useful for tracing axonal bundles and inferring brain connectivity. Diffusion axonal tracing, namely tractography, relies on local directional information provided by the orientation distribution functions (ODFs) estimated at each voxel. To accurately estimate ODFs, data of good signal-to-noise ratio and sufficient angular samples are desired. This is however not always available in practice...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27888085/high-definition-fiber-tractography-in-evaluation-and-surgical-planning-of-thalamopeduncular-pilocytic-astrocytomas-in-pediatric-population-case-series-and-review-of-literature
#6
Emrah Celtikci, Pinar Celtikci, David Tiago Fernandes-Cabral, Murat Ucar, Juan Carlos Fernandez-Miranda, Alp Ozgun Borcek
OBJECTIVE: Thalamopeduncular tumors (TPTs) of the childhood present a challenge for neurosurgeons due to their eloquent location. Preoperative fiber tracking provides total or near-total resection, without additional neurological deficit. High-definition fiber tractography (HDFT) is an advanced white matter imaging technique derived from magnetic resonance imaging diffusion data, shown to overcome limitation of diffusion tensor imaging. We aimed to investigate alterations of corticospinal tract (CST) and medial lemniscus (ML) caused by TPTs and to demonstrate the application of HDFT in preoperative planning...
November 22, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27888083/clinical-and-imaging-evaluation-of-the-transuncus-selective-amygdalo-hippocampectomy
#7
Enrico Ghizoni, Roger Matias, Stefan Lieber, Brunno Machado de Campos, Clarissa Lin Yasuda, João Paulo Sant Ana Santos de Souza, Pamela Castro Pereira, Augusto Amato, Andrei Fernandes Joaquim, Tátila Martins Lopes, Helder Tedeschi, Fernando Cendes
BACKGROUND: Various reports described the transuncus approach (TU) as a selective route to the amygdala and hippocampus, but this approach has not yet being submitted to a solid post operative imaging analysis. The objective of this study was to evaluate the anatomy, surgical technique, postoperative imaging analysis and outcome in a series of temporal lobe epilepsy (TLE) patients who underwent to selective amigdalo-hippocampectomy (SHA) via TU. METHODS: This is a prospective study of 25 consecutive patients who underwent to selective amigdalo-hippocampectomy through TU...
November 22, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27886212/structural-and-functional-connectivity-of-default-mode-network-underlying-the-cognitive-impairment-in-late-onset-depression
#8
Yingying Yin, Xiaofu He, Mingze Xu, Zhenghua Hou, Xiaopeng Song, Yuxiu Sui, Zhi Liu, Wenhao Jiang, Yingying Yue, Yuqun Zhang, Yijun Liu, Yonggui Yuan
To identify the association between the functional and structural changes of default mode network (DMN) underlying the cognitive impairment in Late-onset depression (LOD), 32 LOD patients and 39 normal controls were recruited and underwent resting-state fMRI, DTI scans, and cognitive assessments. Seed-based correlation analysis was conducted to explore the functional connectivity (FC) of the DMN. Deterministic tractography between FC-impaired regions was performed to examine the structural connectivity (SC)...
November 25, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27886204/characterization-of-structural-connectivity-of-the-default-mode-network-in-dogs-using-diffusion-tensor-imaging
#9
Jennifer L Robinson, Madhura Baxi, Jeffrey S Katz, Paul Waggoner, Ronald Beyers, Edward Morrison, Nouha Salibi, Thomas S Denney, Vitaly Vodyanoy, Gopikrishna Deshpande
Diffusion tensor imaging (DTI) provides us an insight into the micro-architecture of white-matter tracts in the brain. This method has proved promising in understanding and investigating the neuronal tracts and structural connectivity between the brain regions in primates as well as rodents. The close evolutionary relationship between canines and humans may have spawned a unique bond in regard to social cognition rendering them useful as an animal model in translational research. In this study, we acquired diffusion data from anaesthetized dogs and created a DTI-based atlas for a canine model which could be used to investigate various white matter diseases...
November 25, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27882295/neuroanatomical-correlates-of-childhood-apraxia-of-speech-a-connectomic-approach
#10
Simona Fiori, Andrea Guzzetta, Jhimli Mitra, Kerstin Pannek, Rosa Pasquariello, Paola Cipriani, Michela Tosetti, Giovanni Cioni, Stephen E Rose, Anna Chilosi
Childhood apraxia of speech (CAS) is a paediatric speech sound disorder in which precision and consistency of speech movements are impaired. Most children with idiopathic CAS have normal structural brain MRI. We hypothesize that children with CAS have altered structural connectivity in speech/language networks compared to controls and that these altered connections are related to functional speech/language measures. Whole brain probabilistic tractography, using constrained spherical deconvolution, was performed for connectome generation in 17 children with CAS and 10 age-matched controls...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27878764/the-involvement-of-supratentorial-white-matter-in-multiple-system-atrophy-a-diffusion-tensor-imaging-tractography-study
#11
Po-Shan Wang, Chien-Li Yeh, Chia-Feng Lu, Hsiu-Mei Wu, Bing-Wen Soong, Yu-Te Wu
It has been assumed that cognitive disorder and visual-spatial disturbance in multiple system atrophy of the predominantly cerebellar type (MSA-C) are attributable to degradation of cerebellar function. The purpose of this study was to use diffusion tensor imaging (DTI) tractography to determine if patients with MSA-C characterized in part by visual-spatial disorders and cognitive disorders have changes of the structural connectivity network of nerve fibers, and to further describe the structural connectivity network...
November 23, 2016: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/27872807/identification-of-the-stria-medullaris-thalami-using-diffusion-tensor-imaging
#12
Ryan B Kochanski, Robert Dawe, Daniel B Eddelman, Mehmet Kocak, Sepehr Sani
BACKGROUND: Deep brain stimulation (DBS) via anatomical targeting of white matter tracts defined by diffusion tensor imaging (DTI) may be a useful tool in the treatment of pathologic neurophysiologic circuits implicated in certain disease states like treatment resistant depression (TRD). We sought to determine if DTI could be used to define the stria medullaris thalami (SM), the major afferent white matter pathway to the lateral habenula (LHb), a thalamic nucleus implicated in the pathophysiology of TRD...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27867698/mapping-3d-fiber-orientation-in-tissue-using-dual-angle-optical-polarization-tractography
#13
Y Wang, M Ravanfar, K Zhang, D Duan, G Yao
Optical polarization tractography (OPT) has recently been applied to map fiber organization in the heart, skeletal muscle, and arterial vessel wall with high resolution. The fiber orientation measured in OPT represents the 2D projected fiber angle in a plane that is perpendicular to the incident light. We report here a dual-angle extension of the OPT technology to measure the actual 3D fiber orientation in tissue. This method was first verified by imaging the murine extensor digitorum muscle placed at various known orientations in space...
October 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27867354/a-symmetry-based-method-to-infer-structural-brain-networks-from-probabilistic-tractography-data
#14
Kamal Shadi, Saideh Bakhshi, David A Gutman, Helen S Mayberg, Constantine Dovrolis
Recent progress in diffusion MRI and tractography algorithms as well as the launch of the Human Connectome Project (HCP) have provided brain research with an abundance of structural connectivity data. In this work, we describe and evaluate a method that can infer the structural brain network that interconnects a given set of Regions of Interest (ROIs) from probabilistic tractography data. The proposed method, referred to as Minimum Asymmetry Network Inference Algorithm (MANIA), does not determine the connectivity between two ROIs based on an arbitrary connectivity threshold...
2016: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/27867131/neuronavigation-based-on-track-density-image-extracted-from-deterministic-high-definition-fiber-tractography-a-case-report
#15
Peng-Hu Wei, Fei Cong, Ge Chen, Ming-Chu Li, Xin-Guang Yu, Yu-Hai Bao
BACKGROUND: Diffusion tensor imaging(DTI)-based navigation is unable to resolve crossing fibers or to determine with accuracy the fanning, origin, and termination of fibers. It is important to improve the accuracy of localizing white matter fibers for improved surgical approaches. We propose a solution to this problem using navigation based on track density imaging(TDI)extracted from high definition fiber tractography(HDFT). CASE DESCRIPTION: A 28-year-old asymptomatic female patient with a left-lateral ventricle meningioma was enrolled in the present study...
November 17, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27862612/the-role-of-the-pallidothalamic-fibre-tracts-in-deep-brain-stimulation-for-dystonia-a-diffusion-mri-tractography-study
#16
Verena Eveline Rozanski, Nadia Moreira da Silva, Seyed-Ahmad Ahmadi, Jan Mehrkens, Joao da Silva Cunha, Jean-Christophe Houde, Christian Vollmar, Kai Bötzel, Maxime Descoteaux
BACKGROUND: Deep Brain Stimulation (DBS) of the Globus pallidus internus (GPi) is gold standard treatment in medically refractory dystonia. Recent evidence indicates that stimulation effects are also due to axonal modulation and affection of a fibre network. For the GPi, the pallidothalamic tracts are known to be the major motor efferent pathways. The aim of this study is to explore the anatomic vicinity of these tracts and DBS electrodes in dystonia applying diffusion tractography. METHODS: Diffusion MRI was acquired in ten patients presenting for DBS for dystonia...
November 16, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27862605/neonatal-neural-networks-predict-children-behavioral-profiles-later-in-life
#17
Chong-Yaw Wee, Ta Anh Tuan, Birit F P Broekman, Min Yee Ong, Yap-Seng Chong, Kenneth Kwek, Lynette Shek, Seang-Mei Saw, Peter D Gluckman, Marielle V Fortier, Michael J Meaney, Anqi Qiu
This study aimed to examine heterogeneity of neonatal brain network and its prediction to child behaviors at 24 and 48 months of age. Diffusion tensor imaging (DTI) tractography was employed to construct brain anatomical network for 120 neonates. Clustering coefficients of individual structures were computed and used to classify neonates with similar brain anatomical networks into one group. Internalizing and externalizing behavioral problems were assessed using maternal reports of the Child Behavior Checklist (CBCL) at 24 and 48 months of age...
November 16, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27862471/assessment-of-passive-muscle-elongation-using-diffusion-tensor-mri-correlation-between-fiber-length-and-diffusion-coefficients
#18
Valentina Mazzoli, Jos Oudeman, Klaas Nicolay, Mario Maas, Nico Verdonschot, Andre M Sprengers, Aart J Nederveen, Martijn Froeling, Gustav J Strijkers
In this study we investigated the changes in fiber length and diffusion parameters as a consequence of passive lengthening and stretching of the calf muscles. We hypothesized that changes in radial diffusivity (RD) are caused by changes in the muscle fiber cross sectional area (CSA) as a consequence of lengthening and shortening of the muscle. Diffusion Tensor MRI (DT-MRI) measurements were made twice in five healthy volunteers, with the foot in three different positions (30° plantarflexion, neutral position and 15° dorsiflexion)...
November 8, 2016: NMR in Biomedicine
https://www.readbyqxmd.com/read/27861352/delayed-gait-recovery-with-recovery-of-an-injured-corticoreticulospinal-tract-in-a-chronic-hemiparetic-patient-a-case-report
#19
Sung Ho Jang, Hyeok Gyu Kwon
OBJECTIVES: We report on a chronic hemiparetic patient whose gait recovery was delayed until healing of an injured corticoreticulospinal tract (CRT), which was demonstrated on diffusion tensor tractography (DTT). CASE PRESENTATION: A 71-year-old female presented with complete paralysis of the right extremities resulting from a spontaneous intracerebral hemorrhage. At 5 months after onset, when she was admitted for rehabilitation after undergoing rehabilitation at the previous university hospital, she presented with severe weakness of the right leg (manual muscle test: 0 ∼ 2- score) and could not even stand...
November 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27860375/differential-impairment-of-thalamocortical-structural-connectivity-in-amyotrophic-lateral-sclerosis
#20
Jiu-Quan Zhang, Bing Ji, Chao-Yang Zhou, Long-Chuan Li, Zhi-Hao Li, Xiao-Ping Hu, Jun Hu
AIMS: The thalamus is a major relay station that modulates input from many cortical areas and a filter for sensory input and is involved in the pathophysiology of amyotrophic lateral sclerosis (ALS). However, it still remains unclear whether all thalamocortical networks are affected or whether there is selective vulnerability. In this study, we aimed to study the selective vulnerability of different thalamocortical structural connections in ALS and to test the hypothesis of a specific impairment in motor-related thalamocortical connectivity...
November 12, 2016: CNS Neuroscience & Therapeutics
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