keyword
MENU ▼
Read by QxMD icon Read
search

Diffusion Tensor MRI

keyword
https://www.readbyqxmd.com/read/29775133/preservation-of-electrophysiological-functional-connectivity-after-partial-corpus-callosotomy-case-report
#1
Kaitlyn Casimo, Fabio Grassia, Sandra L Poliachik, Edward Novotny, Andrew Poliakov, Jeffrey G Ojemann
Prior studies of functional connectivity following callosotomy have disagreed in the observed effects on interhemispheric functional connectivity. These connectivity studies, in multiple electrophysiological methods and functional MRI, have found conflicting reductions in connectivity or patterns resembling typical individuals. The authors examined a case of partial anterior corpus callosum connection, where pairs of bilateral electrocorticographic electrodes had been placed over homologous regions in the left and right hemispheres...
May 18, 2018: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/29774379/-agenesis-of-the-corpus-callosum
#2
REVIEW
J M Lieb, F J Ahlhelm
CLINICAL ISSUE: Agenesis of the corpus callosum is reported to have an incidence of about 1:4000 live births. In 30-45% of cases, genetic etiologies can be identified, e. g., 10% chromosomal anomalies and 20-35% genetic syndromes. Environmental factors like fetal alcohol syndrome are also known to be prone to callosal agenesis. Callosal agenesis can be complete or partial and can be isolated or associated with other central nervous system (CNS) anomalies (e. g., cortical developmental disorders, callosal lipoma, intracranial cysts) or extra-CNS anomalies (e...
May 17, 2018: Der Radiologe
https://www.readbyqxmd.com/read/29773299/diffusion-mri-in-acute-nervous-system-injury
#3
Matthew D Budde, Nathan P Skinner
Diffusion weighted magnetic resonance imaging (DWI) and related techniques such as diffusion tensor imaging (DTI) are uniquely sensitive to the microstructure of the brain and spinal cord. In the acute aftermath of nervous system injury, for example, DWI reveals changes caused by injury that remains invisible on other MRI contrasts such as T2 -weighted imaging. This ability has led to a demonstrated clinical utility in cerebral ischemia. However, despite strong promise in preclinical models and research settings, DWI has not been as readily adopted for other acute injuries such as traumatic spinal cord, brain, or peripheral nerve injury...
April 30, 2018: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29772956/lumbar-muscle-structure-predicts-operational-postures-in-active-duty-marines
#4
David B Berry, Bahar Shahidi, Ana E Rodríguez-Soto, Jan M Hughes-Austin, Karen R Kelly, Samuel R Ward
Study Design Cross-sectional. Background The relationship between lumbar spine posture and muscle structure is not well understood. Objectives Investigate the predictive capacity of muscle structure on lumbar spine posture in active duty Marines. Methods Fouty-three Marines were scanned using an upright magnetic resonance imaging (MRI) scanner while standing unloaded and standing, sitting, and prone on elbows with body armor. Cobb, horizontal, and sacral angles were measured. Marines were then scanned unloaded in supine using a supine MRI scanner...
May 17, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29769375/baseline-nawm-structural-integrity-and-cbf-predict-periventricular-wmh-expansion-over-time
#5
Nutta-On Promjunyakul, Hiroko H Dodge, David Lahna, Erin L Boespflug, Jeffrey A Kaye, William D Rooney, Lisa C Silbert
OBJECTIVE: We aimed to describe and compare baseline cerebral blood flow (CBF) and microstructural characteristics of normal-appearing white matter (NAWM) within the vulnerable periventricular white matter hyperintensity (PVWMH) penumbra region in predicting white matter hyperintensity (WMH) growth over time. METHODS: Fifty-two patients, aged 82.8 years, underwent serial brain MRI, including pulsed arterial spin labeling and diffusion tensor imaging (DTI). New WMH and persistent NAWM voxels in relation to WMH penumbra at follow-up were identified...
May 16, 2018: Neurology
https://www.readbyqxmd.com/read/29768273/subcaudate-tractotomy-white-matter-anatomy-and-variability-a-diffusion-tensor-imaging-study
#6
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/29766355/early-functional-mri-activation-predicts-motor-outcome-after-ischemic-stroke-a-longitudinal-multimodal-study
#7
Juan Du, Fang Yang, Zhiqiang Zhang, Jingze Hu, Qiang Xu, Jianping Hu, Fanyong Zeng, Guangming Lu, Xinfeng Liu
An accurate prediction of long term outcome after stroke is urgently required to provide early individualized neurorehabilitation. This study aimed to examine the added value of early neuroimaging measures and identify the best approaches for predicting motor outcome after stroke. This prospective study involved 34 first-ever ischemic stroke patients (time since stroke: 1-14 days) with upper limb impairment. All patients underwent baseline multimodal assessments that included clinical (age, motor impairment), neurophysiological (motor-evoked potentials, MEP) and neuroimaging (diffusion tensor imaging and motor task-based fMRI) measures, and also underwent reassessment 3 months after stroke...
May 15, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29765059/postnatal-microstructural-developmental-trajectory-of-corpus-callosum-subregions-and-relationship-to-clinical-factors-in-very-preterm-infants
#8
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/29763453/anisotropic-conductivity-tensor-imaging-for-transcranial-direct-current-stimulation-tdcs-using-magnetic-resonance-diffusion-tensor-imaging-mr-dti
#9
Mun Bae Lee, Hyung Joong Kim, Eung Je Woo, Oh In Kwon
Transcranial direct current stimulation (tDCS) is a widely used non-invasive brain stimulation technique by applying low-frequency weak direct current via electrodes attached on the head. The tDCS using a fixed current between 1 and 2 mA has relied on computational modelings to achieve optimal stimulation effects. Recently, by measuring the tDCS current induced magnetic field using an MRI scanner, the internal current pathway has been successfully recovered. However, up to now, there is no technique to visualize electrical properties including the electrical anisotropic conductivity, effective extracellular ion-concentration, and electric field using only the tDCS current in-vivo...
2018: PloS One
https://www.readbyqxmd.com/read/29761003/the-asymmetry-of-neural-symptoms-in-wilson-s-disease-patients-detecting-by-diffusion-tensor-imaging-resting-state-functional-mri-and-susceptibility-weighted-imaging
#10
Xiang-Xue Zhou, Xun-Hua Li, Ding-Bang Chen, Chao Wu, Li Feng, Jian-Ping Chu, Zhi-Yun Yang, Xin-Bei Li, Haolin Qin, Gui-Dian Li, Hai-Wei Huang, Ying-Ying Liang, Xiu-Ling Liang
Objective: To investigate the cause of the motor asymmetry in Wilson's disease (WD) patients using functional MRI. Methods: Fifty patients with WD and 20 age-matched healthy controls were enrolled. Neurological symptoms were scored using the modified Young Scale. All study subjects underwent diffusion tensor imaging (DTI), susceptibility-weighted imaging (SWI), and resting-state functional MRI (rs-fMRI) of the brain. Six regions of interest (ROI) were chosen. Fiber volumes between ROIs on DTI, corrected phase (CP) values on SWI, amplitude of low-frequency fluctuation (ALFF), and regional homogeneity (REHO) values on rs-fMRI were determined...
May 2018: Brain and Behavior
https://www.readbyqxmd.com/read/29760644/an-algorithm-for-preclinical-diagnosis-of-alzheimer-s-disease
#11
REVIEW
Tapan K Khan
Almost all Alzheimer's disease (AD) therapeutic trials have failed in recent years. One of the main reasons for failure is due to designing the disease-modifying clinical trials at the advanced stage of the disease when irreversible brain damage has already occurred. Diagnosis of the preclinical stage of AD and therapeutic intervention at this phase, with a perfect target, are key points to slowing the progression of the disease. Various AD biomarkers hold enormous promise for identifying individuals with preclinical AD and predicting the development of AD dementia in the future, but no single AD biomarker has the capability to distinguish the AD preclinical stage...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29752305/white-matter-integrity-and-processing-speed-in-sickle-cell-anemia
#12
Hanne Stotesbury, Fenella J Kirkham, Melanie Kölbel, Philippa Balfour, Jonathan D Clayden, Sati Sahota, Simrat Sakaria, Dawn E Saunders, Jo Howard, Rachel Kesse-Adu, Baba Inusa, Maria Pelidis, Subarna Chakravorty, David C Rees, Moji Awogbade, Olu Wilkey, Mark Layton, Christopher A Clark, Jamie M Kawadler
OBJECTIVE: The purpose of this retrospective cross-sectional study was to investigate whether changes in white matter integrity are related to slower processing speed in sickle cell anemia. METHODS: Thirty-seven patients with silent cerebral infarction, 46 patients with normal MRI, and 32 sibling controls (age range 8-37 years) underwent cognitive assessment using the Wechsler scales and 3-tesla MRI. Tract-based spatial statistics analyses of diffusion tensor imaging (DTI) and neurite orientation dispersion and density imaging (NODDI) parameters were performed...
May 11, 2018: Neurology
https://www.readbyqxmd.com/read/29748646/the-effect-of-the-total-small-vessel-disease-burden-on-the-structural-brain-network
#13
Xiaopei Xu, Kui Kai Lau, Yuen Kwun Wong, Henry K F Mak, Edward S Hui
Different cerebral small vessel disease (SVD) lesion types have been shown to disrupt structural brain network individually. Considering that they often coexist, we investigated the relation between their collective effect using the recently proposed total SVD score and structural brain network on MRI in 95 patients with first transient ischemic attack (TIA) or ischemic stroke. Fifty-nine patients with and 36 without any SVD lesions were included. The total SVD score was recorded. Diffusion tensor imaging was performed to estimate structural brain connections for subsequent brain connectivity analysis...
May 10, 2018: Scientific Reports
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
#14
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/29742154/diffusion-tensor-mri-of-the-healthy-brachial-plexus
#15
Jos Oudeman, Camiel Verhamme, Maurits P Engbersen, Mattan W A Caan, Mario Maas, Martijn Froeling, Aart J Nederveen, Gustav J Strijkers
INTRODUCTION: Diffusion Tensor MRI (DT-MRI) is a promising tool for the evaluation of brachial plexus pathology. Therefore, we introduce and evaluate a fast DT-MRI protocol (8min33s scanning with 5-10 min postprocessing time) for the brachial plexus. MATERIALS AND METHODS: Thirty healthy volunteers within three age-groups (18-35, 36-55, and > 56) received DT-MRI of the brachial-plexus twice. Means of fractional-anisotropy (FA), mean-diffusivity (MD), axial-diffusivity (AD), and radial-diffusivity (RD) for the individual roots and trunks were evaluated...
2018: PloS One
https://www.readbyqxmd.com/read/29740273/childhood-emotional-abuse-moderates-associations-among-corticomotor-white-matter-structure-and-stress-neuromodulators-in-women-with-and-without-depression
#16
Carlton P Frost, M Elizabeth Meyerand, Rasmus M Birn, Roxanne M Hoks, Erin C Walsh, Heather C Abercrombie
Adverse caregiving during development can produce long-lasting changes to neural, endocrine, and behavioral responses to stress, and is strongly related to elevated risk of adult psychopathology. While prior experience of adversity is associated with altered sympathetic nervous system (SNS) and hypothalamic-pituitary-adrenal (HPA) axis activity, the underlying neural pathways are not completely understood. In a double-blind crossover study, we used diffusion tensor imaging (DTI) to examine whether variation in white matter structure predicts differences in HPA-SNS interactions as a function of early adversity...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29740269/comparison-of-multi-tensor-diffusion-models-performance-for-white-matter-integrity-estimation-in-chronic-stroke
#17
Olena G Filatova, Lucas J van Vliet, Alfred C Schouten, Gert Kwakkel, Frans C T van der Helm, Frans M Vos
Better insight into white matter (WM) alterations after stroke onset could help to understand the underlying recovery mechanisms and improve future interventions. MR diffusion imaging enables to assess such changes. Our goal was to investigate the relation of WM diffusion characteristics derived from diffusion models of increasing complexity with the motor function of the upper limb. Moreover, we aimed to evaluate the variation of such characteristics across different WM structures of chronic stroke patients in comparison to healthy subjects...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29738718/bilateral-thalamocortical-abnormalities-in-focal-cortical-dysplasia
#18
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/29734487/cortical-thickness-and-white-matter-integrity-abnormalities-in-obsessive-compulsive-disorder-a-combined-multimodal-surface-based-morphometry-and-tract-based-spatial-statistics-study
#19
Cong Zhou, Jian Xu, Liangliang Ping, Fengrui Zhang, Wei Chen, Zonglin Shen, Linling Jiang, Xiufeng Xu, Yuqi Cheng
BACKGROUND: Cerebral morphological abnormalities may play a key role in pathogenesis of obsessive-compulsive disorder (OCD). However, few studies have used multimodal imaging strategies to investigate alterations of cortical morphometry and white matter (WM) integrity. This study aimed to evaluate cortical thickness, cortical and subcortical volume, and WM integrity characteristics in OCD patients comprehensively. METHODS: We acquired magnetic resonance imaging (MRI) scans from 52 OCD patients and 46 well-matched healthy controls (HCs)...
May 7, 2018: Depression and Anxiety
https://www.readbyqxmd.com/read/29732609/diffusion-tensor-imaging-of-human-achilles-tendon-by-stimulated-echo-readout-segmented-epi-ste-rs-epi
#20
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
keyword
keyword
77804
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"