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Diffusion tract imaging

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https://www.readbyqxmd.com/read/29678928/imaging-in-pediatric-concussion-a-systematic-review
#1
REVIEW
Julia Schmidt, Kathryn S Hayward, Katlyn E Brown, Jill G Zwicker, Jennie Ponsford, Paul van Donkelaar, Shelina Babul, Lara A Boyd
CONTEXT: Pediatric mild traumatic brain injury (mTBI) is a common and poorly understood injury. Neuroimaging may index brain injury and outcome after pediatric mTBI, but remains largely unexplored. OBJECTIVE: To investigate the differences in neuroimaging findings in children/youth with mTBI. Measures of behavior, symptoms, time since injury, and age at injury were also considered. DATA SOURCES: A systematic review was conducted up to July 6, 2016...
April 20, 2018: Pediatrics
https://www.readbyqxmd.com/read/29675360/deep-infiltrating-endometriosis-mr-imaging-with-surgical-correlation
#2
REVIEW
Xue Tang, Rennan Ling, Jingshan Gong, Dongdong Mei, Yan Luo, Minge Li, Jianmin Xu, Liguo Ma
In this pictorial review, MR imaging findings of deep infiltrating endometriosis (DIE) are illustrated together with surgical correlation. DIE can appear as irregular nodules or plaques with similar signal intensity to muscle on both T1-weighted and T2-weighted images. Hemorrhage foci and strands or stellate margins are also often noted. Restriction of diffusion can be seen on diffusion-weighted image. Fibrosis and adhesions often result in morphologic changes, such as alimentary tract tortuosity, irregular or nodular thickening of uterosacral ligaments, and partial or complete obliteration of the pouch of Douglas...
March 2018: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29674416/altered-white-matter-microstructure-in-the-corpus-callosum-and-its-cerebral-interhemispheric-tracts-in-adolescent-idiopathic-scoliosis-diffusion-tensor-imaging-analysis
#3
C Xue, L Shi, S C N Hui, D Wang, T P Lam, C-B Ip, B K W Ng, J C Y Cheng, W C W Chu
BACKGROUND AND PURPOSE: Neural system was one of the important contributors to the etiopathogenesis of adolescent idiopathic scoliosis; additionally, the morphology of corpus callosum interconnecting both hemispheres of the brain was found to be altered morphologically. Our aim was to evaluate and compare the microstructural changes of the corpus callosum and its interhemispheric white matter fiber tracts interconnecting both cerebral hemispheres in patients with adolescent idiopathic scoliosis and matched controls using diffusion tensor imaging...
April 19, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29673951/revealing-the-cerebello-ponto-hypothalamic-pathway-in-the-human-brain
#4
Arash Kamali, Niloofar Karbasian, Pejman Rabiei, Andres Cano, Roy F Riascos, Nitin Tandon, Octavio Arevalo, Laura Ocasio, Kyan Younes, Mahsa Khayat-Khoei, Saeedeh Mirbagheri, Khader M Hasan
The cerebellum is shown to be involved in some limbic functions of the human brain such as emotion and affect. The major connection of the cerebellum with the limbic system is known to be through the cerebello-hypothalamic pathways. The consensus is that the projections from the cerebellar nuclei to the limbic system, and particularly the hypothalamus, or from the hypothalamus to the cerebellar nuclei, are through multisynaptic pathways in the bulbar reticular formation. The detailed anatomy of the pathways responsible for mediating these responses, however, is yet to be determined...
April 16, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29670573/gait-asymmetry-in-people-with-parkinson-s-disease-is-linked-to-reduced-integrity-of-callosal-sensorimotor-regions
#5
Brett W Fling, Carolin Curtze, Fay B Horak
Background: Individuals with Parkinson's disease (PD) often manifest significant temporal and spatial asymmetries of the lower extremities during gait, which significantly contribute to mobility impairments. While the neural mechanisms underlying mobility asymmetries within this population remain poorly understood, recent evidence points to altered microstructural integrity of white matter fiber tracts within the corpus callosum as potentially playing a substantial role. Objectives: The purpose of this study was to quantify spatial and temporal gait asymmetries as well as transcallosal microstructural integrity of white matter fiber tracts connecting the primary and secondary sensorimotor cortices in people with PD and age-matched control participants...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29667043/abnormalities-in-thalamo-cortical-connections-in-patients-with-first-episode-schizophrenia-a-two-tensor-tractography-study
#6
Hesham M Hamoda, A T Makhlouf, J Fitzsimmons, Y Rathi, N Makris, R I Mesholam-Gately, J D Wojcik, J Goldstein, R W McCarley, L J Seidman, M Kubicki, M E Shenton
The "cognitive dysmetria" hypothesis suggests that impairments in cognition and behavior in patients with schizophrenia can be explained by disruptions in the cortico-cerebellar-thalamic-cortical circuit. In this study we examine thalamo-cortical connections in patients with first-episode schizophrenia (FESZ). White matter pathways are investigated that connect the thalamus with three frontal cortex regions including the anterior cingulate cortex (ACC), ventrolateral prefrontal cortex (VLPFC), and lateral oribitofrontal cortex (LOFC)...
April 17, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29665631/primary-colonic-follicular-lymphoma-presenting-as-four-diminutive-sessile-polyps-found-incidentally-during-colonoscopy
#7
Sun Jin, Hyun Seok Lee, Ji Yun Jeong, Young Wook Jo
Follicular lymphomas, which typically arise in the lymph nodes with spleen, liver, and bone marrow involvement, have generally low occurrence rates in Asian countries as compared with Western countries. Follicular lymphomas of the gastrointestinal tract are rare, and primary colonic follicular lymphomas are particularly rare compared with others found in the small intestine and duodenum. Colonoscopic imaging of colonic lymphomas, including follicular lymphoma, may reveal mucosal ulcerations, erosions, indurations, polypoid mass-like lesions, and diffuse mucosal nodularity...
April 18, 2018: Clinical Endoscopy
https://www.readbyqxmd.com/read/29660514/early-life-predictors-of-brain-development-at-term-equivalent-age-in-infants-born-across-the-gestational-age-spectrum
#8
REVIEW
Deanne K Thompson, Claire E Kelly, Jian Chen, Richard Beare, Bonnie Alexander, Marc L Seal, Katherine Lee, Lillian G Matthews, Peter J Anderson, Lex W Doyle, Alicia J Spittle, Jeanie L Y Cheong
BACKGROUND: It is well established that preterm infants have altered brain development compared with full-term (FT; ≥37 weeks' gestational age [GA]) infants, however the perinatal factors associated with brain development in preterm infants have not been fully elucidated. In particular, perinatal predictors of brain development may differ between very preterm infants (VP; <32 weeks' GA) and infants born moderate (MP; 32-33 weeks' GA) and late (LP; 34-36 weeks' GA) preterm, but this has not been studied...
April 13, 2018: NeuroImage
https://www.readbyqxmd.com/read/29660512/modeling-white-matter-microstructure-with-fiber-ball-imaging
#9
Emilie T McKinnon, Joseph A Helpern, Jens H Jensen
Fiber ball imaging (FBI) provides a means of calculating the fiber orientation density function (fODF) in white matter from diffusion MRI (dMRI) data obtained over a spherical shell with a b-value of about 4000 s/mm2 or higher. By supplementing this FBI-derived fODF with dMRI data acquired for two lower b-value shells, it is shown that several microstructural parameters may be estimated, including the axonal water fraction (AWF) and the intrinsic intra-axonal diffusivity. This fiber ball white matter (FBWM) modeling method is demonstrated for dMRI data acquired from healthy volunteers, and the results are compared with those of the white matter tract integrity (WMTI) method...
April 13, 2018: NeuroImage
https://www.readbyqxmd.com/read/29658987/does-bilingualism-increase-brain-or-cognitive-reserve-in-patients-with-temporal-lobe-epilepsy
#10
Anny Reyes, Brianna M Paul, Anisa Marshall, Yu-Hsuan A Chang, Naeim Bahrami, Leena Kansal, Vicente J Iragui, Evelyn S Tecoma, Tamar H Gollan, Carrie R McDonald
OBJECTIVE: Bilingual healthy adults have been shown to exhibit an advantage in executive functioning (EF) that is associated with microstructural changes in white matter (WM) networks. Patients with temporal lobe epilepsy (TLE) often show EF deficits that are associated with WM compromise. In this study, we investigate whether bilingualism can increase cognitive reserve and/or brain reserve in bilingual patients with TLE, mitigating EF impairment and WM compromise. METHODS: Diffusion tensor imaging was obtained in 19 bilingual and 26 monolingual patients with TLE, 12 bilingual healthy controls (HC), and 21 monolingual HC...
April 16, 2018: Epilepsia
https://www.readbyqxmd.com/read/29655938/delineation-of-early-brain-development-from-fetuses-to-infants-with-diffusion-mri-and-beyond
#11
REVIEW
Minhui Ouyang, Jessica Dubois, Qinlin Yu, Pratik Mukherjee, Hao Huang
Dynamic macrostructural and microstructural changes take place from the mid-fetal stage to 2 years after birth. Delineating brain structural changes during this early developmental period provides new insights into the complicated processes of both typical brain development and the pathological mechanisms underlying various psychiatric and neurological disorders including autism, attention deficit hyperactivity disorder and schizophrenia. Decades of histological studies have identified strong spatial and functional gradients of maturation in human brain gray and white matter...
April 12, 2018: NeuroImage
https://www.readbyqxmd.com/read/29651768/minimisation-of-signal-intensity-differences-in-distortion-correction-approaches-of-brain-magnetic-resonance-diffusion-tensor-imaging
#12
Dong-Hoon Lee, Do-Wan Lee, David Henry, Hae-Jin Park, Bong-Soo Han, Dong-Cheol Woo
OBJECTIVES: To evaluate the effects of signal intensity differences between the b0 image and diffusion tensor imaging (DTI) in the image registration process. METHODS: To correct signal intensity differences between the b0 image and DTI data, a simple image intensity compensation (SIMIC) method, which is a b0 image re-calculation process from DTI data, was applied before the image registration. The re-calculated b0 image (b0ext ) from each diffusion direction was registered to the b0 image acquired through the MR scanning (b0nd ) with two types of cost functions and their transformation matrices were acquired...
April 12, 2018: European Radiology
https://www.readbyqxmd.com/read/29629498/multifocal-alterations-of-white-matter-accompany-the-transition-from-normal-cognition-to-dementia-in-parkinson-s-disease-patients
#13
Maria Chondrogiorgi, Loukas G Astrakas, Anastasia K Zikou, Luca Weis, Vassilios G Xydis, Angelo Antonini, Maria I Argyropoulou, Spiridon Konitsiotis
The purpose of the present study was to investigate the pattern of white matter (WM) changes associated with Parkinson's disease (PD)-related cognitive impairment by using fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD) and radial diffusivity (RD) measures. Diffusion Tensor Imaging (DTI) was performed in 21 PD-patients with dementia (PDD) and in an age-matched control group including 40 PD-patients without dementia (PD-CTRL). The Parkinson's disease-Cognitive Rating Scale (PD-CRS) was used for patients' neuropsychological assessment...
April 9, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29627590/exploring-experimental-autoimmune-optic-neuritis-using-multimodal-imaging
#14
Praveena Manogaran, Christine Walker-Egger, Marijana Samardzija, Conny Waschkies, Christian Grimm, Markus Rudin, Sven Schippling
BACKGROUND: Neuro-axonal injury is a key contributor to non-reversible long-term disability in multiple sclerosis (MS). However, the underlying mechanisms are not yet fully understood. Visual impairment is common among MS patients, in which episodes of optic neuritis (ON) are often followed by structural retinal damage and sustained functional impairment. Alterations in the optic nerve and retina have also been described in rodent experimental autoimmune encephalomyelitis (EAE), a model of MS...
April 5, 2018: NeuroImage
https://www.readbyqxmd.com/read/29627017/effect-of-teriflunomide-on-gray-and-white-matter-brain-pathology-in-multiple-sclerosis-using-volumetric-and-diffusion-tensor-imaging-mri-measures
#15
Robert Zivadinov, Niels Bergsland, Jesper Hagemeier, Ellen Carl, Hanna Kolb, David Hojnacki, Bianca Weinstock-Guttman
OBJECTIVES: To investigate the effect of teriflunomide on microstructural pathology in the gray matter (GM) and white matter (WM), as measured by changes in brain volume and diffusion-tensor imaging (DTI) in patients with multiple sclerosis (MS). METHODS: 30 relapsing MS patients and 20 healthy controls (HCs) were enrolled in the study and followed prospectively for 12 months with clinical and 3T MRI examinations. Of those, 26 MS patients and 18 HCs completed the 6-month and 22 MS and 16 HCs patients the 12-month follow-up...
May 15, 2018: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/29622763/esophageal-mucosal-calcinosis-a-rare-site-of-gastrointestinal-mucosal-calcinosis
#16
Aaron R Huber, Brandon S Sprung, John Miller, Jennifer J Findeis-Hosey
BACKGROUND Gastrointestinal tract mucosal calcinosis (MC) tends to affect the gastric mucosa, while esophageal involvement is rare. Gastric MC may be seen with solid organ transplantation, use of aluminum-containing antacids or sucralfate, malignancy, and chronic renal failure. While the incidence of gastric MC in renal transplant patients undergoing gastric biopsy is common (between 15-29%), to our knowledge esophageal MC has only been previously reported 3 times. CASE REPORT A 68-year-old male dialysis-dependent end stage renal disease status-post deceased donor kidney transplant underwent an esophagogastroduodenoscopy (EGD) for dysphagia and diffuse esophageal wall thickening seen on imaging studies...
April 6, 2018: American Journal of Case Reports
https://www.readbyqxmd.com/read/29617515/development-of-white-matter-circuitry-in-infants-with-fragile-x-syndrome
#17
Meghan R Swanson, Jason J Wolff, Mark D Shen, Martin Styner, Annette Estes, Guido Gerig, Robert C McKinstry, Kelly N Botteron, Joseph Piven, Heather C Hazlett
Importance: Fragile X syndrome (FXS) is a genetic neurodevelopmental disorder and the most common inherited cause of intellectual disability in males. However, there are no published data on brain development in children with FXS during infancy. Objective: To characterize the development of white matter at ages 6, 12, and 24 months in infants with FXS compared with that of typically developing controls. Design, Setting, and Participants: Longitudinal behavioral and brain imaging data were collected at 1 or more time points from 27 infants with FXS and 73 typically developing controls between August 1, 2008, and June 14, 2016, at 2 academic medical centers...
April 4, 2018: JAMA Psychiatry
https://www.readbyqxmd.com/read/29615873/alterations-of-white-matter-integrity-and-hippocampal-functional-connectivity-in-type-2-diabetes-without-mild-cognitive-impairment
#18
Qian Sun, Guan-Qun Chen, Xi-Bin Wang, Ying Yu, Yu-Chuan Hu, Lin-Feng Yan, Xin Zhang, Yang Yang, Jin Zhang, Bin Liu, Cong-Cong Wang, Yi Ma, Wen Wang, Ying Han, Guang-Bin Cui
Aims : To investigate the white matter (WM) integrity and hippocampal functional connectivity (FC) in type 2 diabetes mellitus (T2DM) patients without mild cognitive impairment (MCI) by using diffusion tensor imaging (DTI) and resting-state functional magnetic resonance imaging (rs-fMRI), respectively. Methods : Twelve T2DM patients without MCI and 24 age, sex and education matched healthy controls (HC) were recruited. DTI and rs-fMRI data were subsequently acquired on a 3.0T MR scanner. Tract-based spatial statistics (TBSS) combining region of interests (ROIs) analysis was used to investigate the alterations of DTI metrics (fractional anisotropy (FA), mean diffusivity (MD), λ1 and λ23 ) and FC measurement was performed to calculate hippocampal FC with other brain regions...
2018: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/29607550/mapping-the-trajectory-of-the-amygdalothalamic-tract-in-the-human-brain
#19
Arash Kamali, Roy F Riascos, Jay J Pillai, Haris I Sair, Rajan Patel, Flavia M Nelson, John A Lincoln, Nitin Tandon, Saeedeh Mirbagheri, Pejman Rabiei, Zafer Keser, Khader M Hasan
Although the thalamus is not considered primarily as a limbic structure, abundant evidence indicates the essential role of the thalamus as a modulator of limbic functions indirectly through the amygdala. The amygdala is a central component of the limbic system and serves an essential role in modulating the core processes including the memory, decision-making, and emotional reactions. The amygdalothalamic pathway is the largest direct amygdalo-diencephalic connection in the primates including the human brain...
April 1, 2018: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/29607418/arcuate-fasciculus-in-autism-spectrum-disorder-toddlers-with-language-regression
#20
Lin Zhang, Kailong Li, Chengqi Zhang, Xianlong Qi, Ning Zheng, Guangbin Wang
Language regression is observed in a subset of toddlers with autism spectrum disorder (ASD) as initial symptom. However, such a phenomenon has not been fully explored, partly due to the lack of definite diagnostic evaluation methods and criteria. MATERIALS AND METHODS: Fifteen toddlers with ASD exhibiting language regression and fourteen age-matched typically developing (TD) controls underwent diffusion tensor imaging (DTI). DTI parameters including fractional anisotropy (FA), average fiber length (AFL), tract volume (TV) and number of voxels (NV) were analyzed by Neuro 3D in Siemens syngo workstation...
2018: Open Medicine (Warsaw, Poland)
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