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https://www.readbyqxmd.com/read/29776704/cerebellar-peduncle-injury-predicts-motor-impairments-in-preterm-infants-a-quantitative-tractography-study-at-term-equivalent-age
#1
Tatsuji Hasegawa, Kei Yamada, Takenori Tozawa, Tomohiro Chiyonobu, Sachiko Tokuda, Akira Nishimura, Hajime Hosoi, Masafumi Morimoto
PURPOSE: Cerebellar injury is well established as an important finding in preterm infants with cerebral palsy (CP). In this study, we investigated associations between injury to the cerebellar peduncles and motor impairments in preterm infants using quantitative tractography at term-equivalent age, which represents an early phase before the onset of motor impairments. METHODS: We studied 64 preterm infants who were born at <33 weeks gestational age. These infants were divided into three groups: CP, Non-CP (defined as infants with periventricular leukomalacia but having normal motor function), and a Normal group...
May 15, 2018: Brain & Development
https://www.readbyqxmd.com/read/29768273/subcaudate-tractotomy-white-matter-anatomy-and-variability-a-diffusion-tensor-imaging-study
#2
Kartik D Bhatia, Luke A Henderson, Eugene Hsu, Mark Yim
BACKGROUND: Subcaudate tractotomy is a functional ablative procedure performed for treatment-resistant psychiatric disease, targeting the white matter tracts ventral to the head of the caudate nucleus. The white matter anatomy of this region has extensive interindividual variability, and this is thought to impact upon the treatment response to ablative and deep brain stimulation procedures. OBJECTIVE: We aim to assess in detail the white matter tract anatomy and topographic variability underlying subcaudate tractotomy...
May 16, 2018: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/29765059/postnatal-microstructural-developmental-trajectory-of-corpus-callosum-subregions-and-relationship-to-clinical-factors-in-very-preterm-infants
#3
Radhika Teli, Margaret Hay, Alexa Hershey, Manoj Kumar, Han Yin, Nehal A Parikh
Our objectives were to define the microstructural developmental trajectory of six corpus callosum subregions and identify perinatal clinical factors that influence early development of these subregions in very preterm infants. We performed a longitudinal cohort study of very preterm infants (32 weeks gestational age or younger) (N = 36) who underwent structural MRI and diffusion tensor imaging serially at four time points - before 32, 32, 38, and 52 weeks postmenstrual age. We divided the corpus callosum into six subregions, performed probabilistic tractography, and used linear mixed effects models to evaluate the influence of antecedent clinical factors on its microstructural growth trajectory...
May 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29761954/-research-on-brain-white-matter-network-in-cerebral-palsy-infant
#4
Jun Li, Cheng Yang, Yuanjun Wang, Shengdong Nie
Present study used diffusion tensor image and tractography to construct brain white matter networks of 15 cerebral palsy infants and 30 healthy infants that matched for age and gender. After white matter network analysis, we found that both cerebral palsy and healthy infants had a small-world topology in white matter network, but cerebral palsy infants exhibited abnormal topological organization: increased shortest path length but decreased normalize clustering coefficient, global efficiency and local efficiency...
October 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29758375/alterations-in-the-microstructure-of-white-matter-in-children-and-adolescents-with-tourette-syndrome-measured-using-tract-based-spatial-statistics-and-probabilistic-tractography
#5
Hilmar P Sigurdsson, Sophia E Pépés, Georgina M Jackson, Amelia Draper, Paul S Morgan, Stephen R Jackson
Tourette syndrome (TS) is a neurodevelopmental disorder characterised by repetitive and intermittent motor and vocal tics. TS is thought to reflect fronto-striatal dysfunction and the aetiology of the disorder has been linked to widespread alterations in the functional and structural integrity of the brain. The aim of this study was to assess white matter (WM) abnormalities in a large sample of young patients with TS in comparison to a sample of matched typically developing control individuals (CS) using diffusion MRI...
April 12, 2018: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29758339/population-averaged-atlas-of-the-macroscale-human-structural-connectome-and-its-network-topology
#6
Fang-Cheng Yeh, Sandip Panesar, David Fernandes, Antonio Meola, Masanori Yoshino, Juan C Fernandez-Miranda, Jean M Vettel, Timothy Verstynen
A comprehensive map of the structural connectome in the human brain has been a coveted resource for understanding macroscopic brain networks. Here we report an expert-vetted, population-averaged atlas of the structural connectome derived from diffusion MRI data (N = 842). This was achieved by creating a high-resolution template of diffusion patterns averaged across individual subjects and using tractography to generate 550,000 trajectories of representative white matter fascicles annotated by 80 anatomical labels...
May 11, 2018: NeuroImage
https://www.readbyqxmd.com/read/29756590/mri-and-tractography-in-hypertrophic-olivary-degeneration
#7
Qilun Lai, Chaobo Zheng, Rui Zhang, Xiaoli Liu, Yaguo Li, Qi Xu
No abstract text is available yet for this article.
May 2018: Canadian Journal of Neurological Sciences. le Journal Canadien des Sciences Neurologiques
https://www.readbyqxmd.com/read/29746544/free-water-modeling-of-peritumoral-edema-using-multi-fiber-tractography-application-to-tracking-the-arcuate-fasciculus-for-neurosurgical-planning
#8
Shun Gong, Fan Zhang, Isaiah Norton, Walid I Essayed, Prashin Unadkat, Laura Rigolo, Ofer Pasternak, Yogesh Rathi, Lijun Hou, Alexandra J Golby, Lauren J O'Donnell
PURPOSE: Peritumoral edema impedes the full delineation of fiber tracts due to partial volume effects in image voxels that contain a mixture of cerebral parenchyma and extracellular water. The purpose of this study is to investigate the effect of incorporating a free water (FW) model of edema for white matter tractography in the presence of edema. MATERIALS AND METHODS: We retrospectively evaluated 26 consecutive brain tumor patients with diffusion MRI and T2-weighted images acquired presurgically...
2018: PloS One
https://www.readbyqxmd.com/read/29741595/insula-connections-with-the-parieto-frontal-circuit-for-generating-arm-actions-in-humans-and-macaque-monkeys
#9
G Di Cesare, C Pinardi, C Carapelli, F Caruana, M Marchi, M Gerbella, G Rizzolatti
It has been recently found that the human dorso-central insular cortex contributes to the execution and recognition of the affective component of hand actions, most likely through modulation of the activity of the parieto-frontal circuits. While the anatomical connections between the hand representation of the insula and, the parietal and frontal regions controlling reaching/grasping actions is well assessed in the monkey, it is unknown the existence of a homolog circuit in humans. In the present study, we performed a multifiber tractography investigation to trace the tracts possibly connecting the insula to the parieto-frontal circuits by locating seeds in the parietal, premotor, and prefrontal nodes of the reaching/grasping network, in both humans and monkeys...
May 7, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29739127/diagnostic-validity-of-an-automated-probabilistic-tractography-in-amnestic-mild-cognitive-impairment
#10
Won Sang Jung, Yoo Hyun Um, Dong Woo Kang, Chang Uk Lee, Young Sup Woo, Won-Myong Bahk, Hyun Kook Lim
Objective: Although several prior works showed the white matter (WM) integrity changes in amnestic mild cognitive impairment (aMCI) and Alzheimer's disease, it is still unclear the diagnostic accuracy of the WM integrity measurements using diffusion tensor imaging (DTI) in discriminating aMCI from normal controls. The aim of this study is to explore diagnostic validity of whole brain automated probabilistic tractography in discriminating aMCI from normal controls. Methods: One hundred-two subjects (50 aMCI and 52 normal controls) were included and underwent DTI scans...
May 31, 2018: Clinical Psychopharmacology and Neuroscience: the Official Scientific Journal of the Korean College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29738718/bilateral-thalamocortical-abnormalities-in-focal-cortical-dysplasia
#11
Arthur Rezayev, Henry A Feldman, Jacob Levman, Emi Takahashi
BACKGROUND AND PURPOSE: Focal cortical dysplasia (FCD), a congenital malformation of the neocortex and one of the most common causes of medication resistant epilepsy in pediatric populations, can be studied noninvasively by diffusion tensor imaging (DTI). The present study aimed to quantify changes in the thalamus and thalamocortical pathways with respect to fractional anisotropy (FA), apparent diffusion coefficient (ADC), volume, and other common measures. MATERIALS & METHODS: The study quantified data collected from pediatric patients with a prior diagnosis of FCD; 75 patients (35 females, 10...
May 5, 2018: Brain Research
https://www.readbyqxmd.com/read/29737956/connection-disruption-underlying-attention-deficit-in-subcortical-stroke
#12
Jingchun Liu, Caihong Wang, Qingqing Diao, Wen Qin, Jingliang Cheng, Chunshui Yu
Purpose To investigate neural substrates underlying attention deficit in patients with chronic subcortical stroke by combining voxel-based lesion-symptom mapping (VLSM) and diffusion-tensor (DT) tractography. Materials and Methods Institutional review board approval and written informed consent were obtained. Diffusion magnetic resonance imaging data were prospectively acquired from August 1, 2014, to March 30, 2015, in 49 patients (32 men, 17 women; mean age, 55.7 years ± 8.0; age range, 40-71 years) with subcortical infarctions in the basal ganglia and neighboring regions and 52 control subjects (30 men, 22 women; mean age, 54...
May 8, 2018: Radiology
https://www.readbyqxmd.com/read/29733955/structural-and-functional-connectivity-of-the-nondecussating-dentato-rubro-thalamic-tract
#13
Kalen J Petersen, Jacqueline A Reid, Srijata Chakravorti, Meher R Juttukonda, Giulia Franco, Paula Trujillo, Adam J Stark, Benoit M Dawant, Manus J Donahue, Daniel O Claassen
The dentato-rubro-thalamic tract (DRTT) regulates motor control, connecting the cerebellum to the thalamus. This tract is modulated by deep-brain stimulation in the surgical treatment of medically refractory tremor, especially in essential tremor, where high-frequency stimulation of the thalamus can improve symptoms. The DRTT is classically described as a decussating pathway, ascending to the contralateral thalamus. However, the existence of a nondecussating (i.e. ipsilateral) DRTT in humans was recently demonstrated, and these tracts are arranged in distinct regions of the superior cerebellar peduncle...
May 4, 2018: NeuroImage
https://www.readbyqxmd.com/read/29733919/disruptions-of-brain-structural-network-in-end-stage-renal-disease-patients-with-long-term-hemodialysis-and-normal-appearing-brain-tissues
#14
Ming-Chung Chou, Chih-Hung Ko, Jer-Ming Chang, Tsyh-Jyi Hsieh
OBJECTIVE: End-stage renal disease (ESRD) patients on hemodialysis were demonstrated to exhibit silent and invisible white-matter alterations which would likely lead to disruptions of brain structural networks. Therefore, the purpose of this study was to investigate the disruptions of brain structural network in ESRD patients. MATERIALS AND METHODS: Thiry-three ESRD patients with normal-appearing brain tissues and 29 age- and gender-matched healthy controls were enrolled in this study and underwent both cognitive ability screening instrument (CASI) assessment and diffusion tensor imaging (DTI) acquisition...
May 4, 2018: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/29732609/diffusion-tensor-imaging-of-human-achilles-tendon-by-stimulated-echo-readout-segmented-epi-ste-rs-epi
#15
Kenneth Wengler, Dharmesh Tank, Takeshi Fukuda, James M Paci, Mingqian Huang, Mark E Schweitzer, Xiang He
PURPOSE: Healing, regeneration, and remodeling of the injured Achilles tendon are associated with notable changes in tendon architecture. However, assessing Achilles microstructural properties with conventional diffusion tension imaging (DTI) remains a challenge because of very short T2 / T2* values of the tendon. Hence, the objective of this study was to develop a novel Achilles tendon DTI protocol for a non-invasive investigation of the changes of microstructural integrity in tendinopathy...
May 6, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29727819/alterations-in-white-matter-pathways-underlying-phonological-and-morphological-processing-in-chinese-developmental-dyslexia
#16
Mengmeng Su, Jingjing Zhao, Michel Thiebaut de Schotten, Wei Zhou, Gaolang Gong, Franck Ramus, Hua Shu
Chinese is a logographic language that is different from alphabetic languages in visual and semantic complexity. Thus far, it is still unclear whether Chinese children with dyslexia show similar disruption of white matter pathways as in alphabetic languages. The present study focused on the alteration of white matter pathways in Chinese children with dyslexia. Using diffusion tensor imaging tractography, the bilateral arcuate fasciculus (AF-anterior, AF-posterior and AF-direct segments), inferior fronto-occipital fasciculus (IFOF) and inferior longitudinal fasciculus (ILF) were delineated in each individual's native space...
April 13, 2018: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/29726781/microsurgical-anatomy-of-the-subthalamic-nucleus-correlating-fiber-dissection-results-with-3-t-magnetic-resonance-imaging-using-neuronavigation
#17
Abuzer Güngör, Şevki Serhat Baydın, Vanessa M Holanda, Erik H Middlebrooks, Cihan Isler, Bekir Tugcu, Kelly Foote, Necmettin Tanriover
OBJECTIVE Despite the extensive use of the subthalamic nucleus (STN) as a deep brain stimulation (DBS) target, unveiling the extensive functional connectivity of the nucleus, relating its structural connectivity to the stimulation-induced adverse effects, and thus optimizing the STN targeting still remain challenging. Mastering the 3D anatomy of the STN region should be the fundamental goal to achieve ideal surgical results, due to the deep-seated and obscure position of the nucleus, variable shape and relatively small size, oblique orientation, and extensive structural connectivity...
May 4, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29722629/cognitive-function-disease-burden-and-the-structural-connectome-in-systemic-lupus-erythematosus
#18
S J Wiseman, M E Bastin, E N Amft, J F F Belch, S H Ralston, J M Wardlaw
Objective To investigate brain structural connectivity in relation to cognitive abilities and systemic damage in systemic lupus erythematosus (SLE). Methods Structural and diffusion MRI data were acquired from 47 patients with SLE. Brains were segmented into 85 cortical and subcortical regions and combined with whole brain tractography to generate structural connectomes using graph theory. Global cognitive abilities were assessed using a composite variable g, derived from the first principal component of three common clinical screening tests of neurological function...
January 1, 2018: Lupus
https://www.readbyqxmd.com/read/29722327/structural-neural-connectivity-of-the-vestibular-nuclei-in-the-human-brain-a-diffusion-tensor-imagings-study
#19
Sung Ho Jang, Mi Young Lee, Sang Seok Yeo, Hyeok Gyu Kwon
Many animal studies have reported on the neural connectivity of the vestibular nuclei (VN). However, little is reported on the structural neural connectivity of the VN in the human brain. In this study, we attempted to investigate the structural neural connectivity of the VN in 37 healthy subjects using diffusion tensor tractography. A seed region of interest was placed on the isolated VN using probabilistic diffusion tensor tractography. Connectivity was defined as the incidence of connection between the VN and each brain region...
April 2018: Neural Regeneration Research
https://www.readbyqxmd.com/read/29719853/reconstruction-of-white-matter-fibre-tracts-using-diffusion-kurtosis-tensor-imaging-at-1-5t-pre-surgical-planning-in-patients-with-gliomas
#20
Joao Leote, Rita G Nunes, Luis Cerqueira, Ricardo Loução, Hugo A Ferreira
Tractography studies for pre-surgical planning of primary brain tumors is typically done using diffusion tensor imaging (DTI), which cannot resolve crossing, kissing or highly angulated fibres. Tractography based on the estimation of the diffusion kurtosis (DK) tensor was recently demonstrated to enable tackling these limitations. However, its use in the clinical context at low 1.5T field has not yet been reported. Purpose: To evaluate if the estimation of whole-brain tractography using the DK tensor is feasible for pre-surgical investigation of patients with brain tumors at 1...
2018: European Journal of Radiology Open
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