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Diffusion tract imaging

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https://www.readbyqxmd.com/read/28437669/white-matter-microstructural-abnormalities-and-their-association-with-anticipatory-anhedonia-in-depression
#1
Xin-Hua Yang, Yi Wang, Dong-Fang Wang, Kai Tian, Eric F C Cheung, Guang-Rong Xie, Raymond C K Chan
Anhedonia is associated with dysfunction of the neural circuitry of reward in patients with major depressive disorder (MDD). However, its neurobiological basis is not fully understood. The present study examined the association between anhedonia and white matter (WM) characteristics in patients with first-episode MDD. We recruited 30 patients with first-episode drug-naive MDD and 28 healthy controls (HC) to undergo diffusion weighted imaging. We examined specifically the correlation between WM characteristics and anhedonia measured with the Temporal Experience of Pleasure Scale (TEPS) in MDD patients...
April 13, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28433388/magnetic-resonance-and-diffusion-tensor-imaging-analyses-indicate-heterogeneous-strains-along-human-medial-gastrocnemius-fascicles-caused-by-submaximal-plantar-flexion-activity
#2
Agah Karakuzu, Uluç Pamuk, Cengizhan Ozturk, Burak Acar, Can A Yucesoy
Sarcomere length changes are central to force production and excursion of skeletal muscle. Previous modeling indicates non-uniformity of that if mechanical interaction of muscle with its surrounding muscular and connective tissues is taken into account. Hence, quantifying length changes along the fascicles of activated human muscle in vivo is crucial, but this is lacking due to technical complexities. Combining magnetic resonance imaging deformation analyses and diffusion tensor imaging tractography, the aim was to test the hypothesis that submaximal plantar flexion activity at 15% MVC causes heterogeneous length changes along the fascicles of human medial gastrocnemius (GM) muscle...
April 9, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28433201/humoral-primary-immunodeficiency-diseases-clinical-overview-and-chest-high-resolution-computed-tomography-hrct-features-in-the-adult-population
#3
REVIEW
L Cereser, R Girometti, P d'Angelo, M De Carli, A De Pellegrin, C Zuiani
Humoral primary immunodeficiency diseases (hPIDs) are a heterogeneous group of hereditary disorders resulting in abnormal susceptibility to infections of the sinopulmonary tract. Some of these conditions (e.g., common variable immunodeficiency disorders [CVID]) imply a number of non-infectious thoracic complications such as non-infectious airway disorders, diffuse lung parenchymal diseases, and neoplasms. Chest high-resolution computed tomography (HRCT) is a key imaging tool to characterise and quantify the extent of underlying thoracic involvement, as well as to direct and monitor treatment...
April 19, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28431605/global-brain-atrophy-and-metabolic-dysfunction-in-lgi1-encephalitis-a-prospective-multimodal-mri-study
#4
Monika Szots, Morten Blaabjerg, Gergely Orsi, Pernille Iversen, Daniel Kondziella, Camilla G Madsen, Ellen Garde, Peter O Magnusson, Peter Barsi, Ferenc Nagy, Hartwig R Siebner, Zsolt Illes
BACKGROUND: Chronic cognitive deficits are frequent in leucin-rich glioma-inactivated 1 protein (LGI1) encephalitis. We examined structural and metabolic brain abnormalities following LGI1 encephalitis and correlated findings with acute and follow-up clinical outcomes. METHODS: Nine patients underwent prospective multimodal 3 Tesla MRI 33.1±18months after disease onset, including automated volumetry, diffusion tensor imaging (DTI) and magnetic resonance spectroscopy (MRS)...
May 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28429407/spinal-cord-injury-induces-widespread-chronic-changes-in-cerebral-white-matter
#5
Tero Ilvesmäki, Eerika Koskinen, Antti Brander, Teemu Luoto, Juha Öhman, Hannu Eskola
Traumatic spinal cord injuries (SCIs) lead to axonal damage at the trauma site, as well as disconnections within the central nervous system. While the exact mechanisms of the long-term pathophysiological consequences of SCIs are not fully understood, it is known that neuronal damage and degeneration are not limited to the direct proximity of the trauma. Instead, the effects can be detected even in the cerebrum. We examined SCI-induced chronic brain changes with a case-control design using 32 patients and 70 control subjects...
April 21, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28425348/integration-of-functional-mri-and-white-matter-tractography-in-cyberknife-radiosurgery
#6
Lu Sun, Baolin Qu, Jinyuan Wang, Zhongjian Ju, Zizhong Zhang, Zhiqiang Cui, Yang Jack, Zhipei Ling, Xinguang Yu, Longsheng Pan
PURPOSE: To investigate the efficacy of the integration of functional magnetic resonance imaging and diffusion-tensor imaging tractography data into CyberKnife radiosurgery for intracranial tumor management. MATERIALS AND METHODS: Functional neuroimaging, anatomical magnetic resonance imaging, and computed tomography images of patients with brain lesions in critical areas were acquired before radiosurgery. The acquired data sets were coregistered using the MIM image fusion software module and then were imported into the CyberKnife Robotic Radiosurgery System (Multiplan 4...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28425061/gray-matter-and-white-matter-changes-in-non-demented-amyotrophic-lateral-sclerosis-patients-with-or-without-cognitive-impairment-a-combined-voxel-based-morphometry-and-tract-based-spatial-statistics-whole-brain-analysis
#7
Foteini Christidi, Efstratios Karavasilis, Franz Riederer, Ioannis Zalonis, Panagiotis Ferentinos, Georgios Velonakis, Sophia Xirou, Michalis Rentzos, Georgios Argiropoulos, Vasiliki Zouvelou, Thomas Zambelis, Athanasios Athanasakos, Panagiotis Toulas, Konstantinos Vadikolias, Efstathios Efstathopoulos, Spyros Kollias, Nikolaos Karandreas, Nikolaos Kelekis, Ioannis Evdokimidis
The phenotypic heterogeneity in amyotrophic lateral sclerosis (ALS) implies that patients show structural changes within but also beyond the motor cortex and corticospinal tract and furthermore outside the frontal lobes, even if frank dementia is not detected. The aim of the present study was to investigate both gray matter (GM) and white matter (WM) changes in non-demented amyotrophic lateral sclerosis (ALS) patients with or without cognitive impairment (ALS-motor and ALS-plus, respectively). Nineteen ALS-motor, 31 ALS-plus and 25 healthy controls (HC) underwent 3D-T1-weighted and 30-directional diffusion-weighted imaging on a 3 T MRI scanner...
April 19, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28424595/gray-matter-atrophy-is-primarily-related-to-demyelination-of-lesions-in-multiple-sclerosis-a-diffusion-tensor-imaging-mri-study
#8
Eszter Tóth, Nikoletta Szabó, Gergõ Csete, András Király, Péter Faragó, Tamás Spisák, Krisztina Bencsik, László Vécsei, Zsigmond T Kincses
Objective: Cortical pathology, periventricular demyelination, and lesion formation in multiple sclerosis (MS) are related (Hypothesis 1). Factors in the cerebrospinal fluid close to these compartments could possibly drive the parallel processes. Alternatively, the cortical atrophy could be caused by remote axonal transection (Hypothesis 2). Since MRI can differentiate between demyelination and axon loss, we used this imaging modality to investigate the correlation between the pattern of diffusion parameter changes in the periventricular- and deep white matter and the gray matter atrophy...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/28424004/segmental-diffusion-properties-of-the-corticospinal-tract-and-motor-outcome-in-hemiparetic-children-with-perinatal-stroke
#9
Jacquie Hodge, Bradley Goodyear, Helen Carlson, Xing-Chang Wei, Adam Kirton
Perinatal stroke injures developing motor systems, resulting in hemiparetic cerebral palsy. Diffusion tensor imaging can explore structural connectivity. We used diffusion tensor imaging to assess corticospinal tract diffusion in hemiparetic children with perinatal stroke. Twenty-eight children (6-18 years) with unilateral stroke underwent diffusion tensor imaging. Four corticospinal tract assessments included full tract, partial tract, minitract and region of interest. Diffusion characteristics (fractional anisotropy, mean, axial, and radial diffusivity) were calculated...
May 2017: Journal of Child Neurology
https://www.readbyqxmd.com/read/28420955/hemispheric-differences-in-white-matter-microstructure-between-two-profiles-of-children-with-high-intelligence-quotient-vs-controls-a-tract-based-spatial-statistics-study
#10
Fanny Nusbaum, Salem Hannoun, Gabriel Kocevar, Claudio Stamile, Pierre Fourneret, Olivier Revol, Dominique Sappey-Marinier
Objectives: The main goal of this study was to investigate and compare the neural substrate of two children's profiles of high intelligence quotient (HIQ). Methods: Two groups of HIQ children were included with either a homogeneous (Hom-HIQ: n = 20) or a heterogeneous IQ profile (Het-HIQ: n = 24) as defined by a significant difference between verbal comprehension index and perceptual reasoning index. Diffusion tensor imaging was used to assess white matter (WM) microstructure while tract-based spatial statistics (TBSS) analysis was performed to detect and localize WM regional differences in fractional anisotropy (FA), mean diffusivity, axial (AD), and radial diffusivities...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28419638/a-diffusion-tensor-imaging-tractography-study-in-bipolar-disorder-patients-compared-to-first-degree-relatives-and-healthy-controls
#11
Ananya Mahapatra, Sudhir Kumar Khandelwal, Pratap Sharan, Ajay Garg, N K Mishra
AIM: To compare white matter structural changes in specific tracts by diffusion tensor imaging (DTI) tractography in patients of bipolar disorder I, non-ill first degree relatives of the patients, and healthy controls. METHODS: In a cross sectional study, we studied right-handed subjects consisting of 16 euthymic bipolar disorder I patients, 15 first degree relatives and 15 healthy controls. The anterior thalamic radiation, uncinate fasciculus, corpus callosum, and cingulum bundle were reconstructed by DTI tractography...
April 17, 2017: Psychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/28418197/body-mass-index-associates-with-white-matter-microstructure-in-bipolar-depression
#12
Elena Mazza, Sara Poletti, Irene Bollettini, Clara Locatelli, Andrea Falini, Cristina Colombo, Francesco Benedetti
OBJECTIVES: Obesity has been reported in over 60% of bipolar disorder (BD) patients. It worsens the severity of illness, and influences cognition and functional outcomes. White matter (WM) abnormalities are one of the most consistently reported findings in neuroimaging studies of BD. We hypothesized that body mass index (BMI) could correlate with WM integrity in bipolar patients. METHODS: We evaluated BMI in a sample of 164 depressed patients affected by BD. We performed whole-brain tract-based spatial statistics with threshold-free cluster enhancement for the diffusion tensor imaging (DTI) measures of WM integrity: fractional anisotropy; axial, radial, and mean diffusivity...
April 18, 2017: Bipolar Disorders
https://www.readbyqxmd.com/read/28408293/vesicular-monoamine-transporter-1-gene-polymorphism-and-white-matter-integrity-in-major-depressive-disorder
#13
Eunsoo Won, Kyu-Man Han, June Kang, Aram Kim, Ho-Kyoung Yoon, Hun Soo Chang, Ji-Young Park, Min-Soo Lee, Tsafrir Greenberg, Woo-Suk Tae, Byung-Joo Ham
The genetic variant of the vesicular monoamine transporter 1 gene (VMAT1) has been suggested to be associated with monoaminergic signaling and neural circuit activity related to emotion processing. We aimed to investigate microstructural changes in white matter tracts of patients with major depressive disorder (MDD), and examined the interaction effect between VMAT1 Thr136Ile (rs1390938) polymorphism and MDD on white matter integrity. Diffusion tensor imaging (DTI) and VMAT1 Thr136Ile (rs1390938) genotyping were performed on 103 patients diagnosed with MDD and 83 healthy control participants...
April 10, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28404971/association-between-tumor-architecture-derived-from-generalized-q-space-mri-and-survival-in-glioblastoma
#14
Erik N Taylor, Yao Ding, Shan Zhu, Eric Cheah, Phillip Alexander, Leon Lin, George E Aninwene Ii, Matthew P Hoffman, Anita Mahajan, Abdallah S R Mohamed, Nathan McDannold, Clifton D Fuller, Clark C Chen, Richard J Gilbert
While it is recognized that the overall resistance of glioblastoma to treatment may be related to intra-tumor patterns of structural heterogeneity, imaging methods to assess such patterns remain rudimentary. METHODS: We utilized a generalized Q-space imaging (GQI) algorithm to analyze magnetic resonance imaging (MRI) derived from a rodent model of glioblastoma and 2 clinical datasets to correlate GQI, histology, and survival. RESULTS: In a rodent glioblastoma model, GQI demonstrated a poorly coherent core region, consisting of diffusion tracts <5 mm, surrounded by a shell of highly coherent diffusion tracts, 6-25 mm...
March 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28398337/sex-differences-in-frontal-lobe-connectivity-in-adults-with-autism-spectrum-conditions
#15
E A Zeestraten, M C Gudbrandsen, E Daly, M T de Schotten, M Catani, F Dell'Acqua, M-C Lai, A N V Ruigrok, M V Lombardo, B Chakrabarti, S Baron-Cohen, C Ecker, D G M Murphy, M C Craig
Autism spectrum conditions (ASC) are more prevalent in males than females. The biological basis of this difference remains unclear. It has been postulated that one of the primary causes of ASC is a partial disconnection of the frontal lobe from higher-order association areas during development (that is, a frontal 'disconnection syndrome'). Therefore, in the current study we investigated whether frontal connectivity differs between males and females with ASC. We recruited 98 adults with a confirmed high-functioning ASC diagnosis (61 males: aged 18-41 years; 37 females: aged 18-37 years) and 115 neurotypical controls (61 males: aged 18-45 years; 54 females: aged 18-52 years)...
April 11, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28396994/identifying-the-white-matter-impairments-among-art-na%C3%A3-ve-hiv-patients-a-multivariate-pattern-analysis-of-dti-data
#16
Zhenchao Tang, Zhenyu Liu, Ruili Li, Xin Yang, Xingwei Cui, Shuo Wang, Dongdong Yu, Hongjun Li, Enqing Dong, Jie Tian
OBJECTIVE: To identify the white matter (WM) impairments of the antiretroviral therapy (ART)-naïve HIV patients by conducting a multivariate pattern analysis (MVPA) of Diffusion Tensor Imaging (DTI) data METHODS: We enrolled 33 ART-naïve HIV patients and 32 Normal controls in the current study. Firstly, the DTI metrics in whole brain WM tracts were extracted for each subject and feed into the Least Absolute Shrinkage and Selection Operators procedure (LASSO)-Logistic regression model to identify the impaired WM tracts...
April 10, 2017: European Radiology
https://www.readbyqxmd.com/read/28394195/composite-mri-measures-and-short-term-disability-in-patients-with-clinically-isolated-syndrome-suggestive-of-ms
#17
Giulia Bommarito, Alessandro Bellini, Matteo Pardini, Claudio Solaro, Luca Roccatagliata, Alice Laroni, Elisabetta Capello, Giovanni Luigi Mancardi, Antonio Uccelli, Matilde Inglese
BACKGROUND: The use of composite magnetic resonance imaging (MRI) measures has been suggested to better explain disability in patients with multiple sclerosis (MS). However, little is known about the utility of composite scores at the earliest stages of the disease. OBJECTIVE: To investigate whether, in patients with clinically isolated syndrome (CIS), a composite MRI measure, rather than the single metrics, would explain conversion to MS and would better correlate with disability at baseline and at 1 year of follow-up...
April 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28392487/variation-on-the-dopamine-d2-receptor-gene-drd2-is-associated-with-basal-ganglia-to-frontal-structural-connectivity
#18
Sebastian Markett, Marcel A de Reus, Martin Reuter, Christian Montag, Bernd Weber, Jan-Christoph Schoene-Bake, Martijn P van den Heuvel
Dopaminergic neurotransmission in the mesocortical system is crucial for higher order cognition. Common variation on the dopamine D2 receptor (DRD2) gene has been linked to individual differences in dopaminergic signaling and was also repeatedly associated to cognitive markers. The relationship between dopaminergic genetic variants and neurostructural properties of the mesocortical system, however, has received little attention so far. Recently, the direction of a dopaminergic manipulation was predicted from the integrity of fiber tracts between subcortical areas and the frontal lobes...
April 7, 2017: NeuroImage
https://www.readbyqxmd.com/read/28391647/probabilistic-versus-deterministic-fiber-tracking-and-the-influence-of-different-seed-regions-to-delineate-cerebellar-thalamic-fibers-in-deep-brain-stimulation
#19
Juergen R Schlaier, Anton L Beer, Rupert Faltermeier, Claudia Fellner, Kathrin Steib, Max Lange, Mark W Greenlee, Alexander T Brawanski, Judith M Anthofer
This study compared tractography approaches for identifying cerebellar-thalamic fiber bundles relevant for planning target sites for deep brain stimulation (DBS). In particular, probabilistic and deterministic tracking of the dentate-rubro-thalamic tract (DRTT) and differences between the spatial courses of the DRTT and the cerebello-thalamo-cortical (CTC) tract were compared. Six patients with movement disorders were examined by magnetic resonance imaging (MRI) including two sets of diffusion-weighted images (12 and 64 directions)...
April 9, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28390285/a-genetic-algorithm-based-model-for-longitudinal-changes-detection-in-white-matter-fiber-bundles-of-patient-with-multiple-sclerosis
#20
Claudio Stamile, Gabriel Kocevar, François Cotton, Dominique Sappey-Marinier
Analysis of white matter (WM) tissue is essential to understand the mechanisms of neurodegenerative pathologies like multiple sclerosis (MS). Recently longitudinal studies started to show how the temporal component is important to investigate temporal diffuse effects of neurodegenerative pathologies. Diffusion tensor imaging (DTI) constitutes one of the most sensitive techniques for the detection and characterization of brain related pathological processes and allows also the reconstruction of WM fibers. The analysis of spatial and temporal pathological changes along the fibers are thus possible by merging quantitative maps with structural information provided by DTI...
March 31, 2017: Computers in Biology and Medicine
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