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https://www.readbyqxmd.com/read/29786892/association-between-initial-age-of-exposure-to-childhood-abuse-and-cognitive-control-preliminary-evidence
#1
Kristen L Mackiewicz Seghete, Anne P DePrince, Marie T Banich
Cognitive control, which relies on the protracted development of frontal-parietal regions into adolescence, is a brain process that may be particularly vulnerable to the impact of childhood abuse. In this study, we used functional magnetic resonance imaging (fMRI) to examine associations between the age of onset of childhood abuse and alterations to the neural mechanisms supporting cognitive control in early adulthood, which have not been previously examined. During fMRI scanning, participants completed hybrid block/event-related versions of a classic color-word Stroop task as well as emotional Stroop tasks (threat and positive words)...
May 22, 2018: Journal of Traumatic Stress
https://www.readbyqxmd.com/read/29786833/assessment-of-cerebral-perfusion-and-edema-in-preeclampsia-with-intravoxel-incoherent-motion-mri
#2
Maria Nelander, Daniel Hannsberger, Inger Sundström-Poromaa, Lina Bergman, Jan Weis, Helena Åkerud, Johan Wikström, Anna-Karin Wikström
INTRODUCTION: Cerebral complications are the main reasons for morbidity and mortality in preeclampsia and eclampsia. Still we do not know if the pathophysiology entails hypo- or hyperperfusion of the brain, or how and when edema emerges, due to the difficulty to examine the cerebral circulation. MATERIAL AND METHODS: We have used a non-invasive diffusion weighted magnetic resonance imaging (MRI) technique, intravoxel incoherent motion, to study cerebral perfusion on the capillary level and cerebral edema in women with preeclampsia (n=30), normal pregnancy (n=32) and non-pregnant women (n=16)...
May 22, 2018: Acta Obstetricia et Gynecologica Scandinavica
https://www.readbyqxmd.com/read/29786697/imaging-glutathione-depletion-in-the-rat-brain-using-ascorbate-derived-hyperpolarized-mr-and-pet-probes
#3
Hecong Qin, Valerie N Carroll, Renuka Sriram, Javier E Villanueva-Meyer, Cornelius von Morze, Zhen Jane Wang, Christopher A Mutch, Kayvan R Keshari, Robert R Flavell, John Kurhanewicz, David M Wilson
Oxidative stress is a critical feature of several common neurologic disorders. The brain is well adapted to neutralize oxidative injury by maintaining a high steady-state concentration of small-molecule intracellular antioxidants including glutathione in astrocytes and ascorbic acid in neurons. Ascorbate-derived imaging probes for hyperpolarized 13 C magnetic resonance spectroscopy and positron emission tomography have been used to study redox changes (antioxidant depletion and reactive oxygen species accumulation) in vivo...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29786616/derivation-of-new-diagnostic-reference-levels-for-neuro-paediatric-computed-tomography-examinations-in-switzerland
#4
Franca Wagner, Julie Bize, Damien Racine, Regis Le Coultre, Verdun Francis, Philipp Trueb, Reto Treier
Definition of new national diagnostic reference levels (DRLs) for volume computed tomography dose index (CTDIvol) and dose length product (DLP) for neuro-paediatric CT examinations depending on the medical indication.
 Methods: Paediatric cranial CT data sets acquired between January 2013 and December 2016 were retrospectively collected between July 2016 and March 2017 from the eight largest university and cantonal hospitals that perform most of the neuro-paediatric CTs in Switzerland. A consensus review of CTDIvol and DLP was undertaken for the three defined anatomical regions: brain, facial bone and petrous bone; each with and without contrast medium application...
May 22, 2018: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/29786476/orthopedic-injured-versus-uninjured-comparison-groups-for-neuroimaging-research-in-mild-traumatic-brain-injury
#5
Elisabeth A Wilde, Ashley L Ware, Xiaoqi Li, Trevor C Wu, Stephen R McCauley, Amanda Barnes, Mary Newsome, Brian Biekman, Jill V Hunter, Zili Chu, Harvey Levin
To address controversy surrounding the most appropriate comparison group for mild traumatic brain injury (mTBI) research, mTBI patients aged 12-30 years were compared to an extracranial orthopedic injury (OI) patient group and an uninjured, typically-developing (TD) participant group with comparable demographic backgrounds. Injured participants underwent subacute (within 96 hours) and late (3 months) diffusion tensor imaging (DTI); TD controls underwent DTI once. Group differences in fractional anisotropy (FA) and mean diffusivity (MD) of commonly studied white matter tracts were assessed...
May 22, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29786464/what-can-we-learn-from-diffusion-tensor-imaging-from-a-large-traumatic-brain-injury-cohort-white-matter-integrity-and-its-relationship-with-outcome
#6
Ana M Castaño-Leon, Marta Cicuendez, Blanca Navarro, Pablo M Munarriz, Santiago Cepeda, Igor Paredes, Amaya Hilario, Ana Ramos, Pedro Antonio Gomez, Alfonso Lagares
Traumatic axonal injury (TAI) contributes significantly to mortality and morbidity after traumatic brain injury (TBI) but its identification is still a diagnostic challenge because of the limitations of conventional imaging techniques to characterized it. Diffusion tensor imaging (DTI) can indirectly identify areas of damaged white matter (WM) integrity by detecting water molecules diffusion alterations. Therefore, DTI may improve detection and description of TAI lesions after TBI. We have obtained DTI data from 217 patients with moderate to severe TBI acquired at median 19 days after TBI were and patient DTI metrics were compared with data obtained from 58 age-matched healthy controls...
May 22, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29786463/hybrid-diffusion-imaging-in-mild-traumatic-brain-injury
#7
Yu-Chien Wu, Sourajit Mitra Mustafi, Jaroslaw Harezlak, Chandana Kodiweera, Laura A Flashman, Thomas McAllister
Mild traumatic brain injury (mTBI) is an important public health problem. Although conventional medical imaging techniques can detect moderate-to-severe injuries, they are relatively insensitive to mTBI. In this study, we used hybrid diffusion imaging (HYDI) to detect white-matter alterations in nineteen patients with mTBI and 23 other trauma-control patients. Within 15 days (SD=10) of brain injury, all subjects underwent magnetic-resonance HYDI and were assessed with battery of neuropsychological tests of sustained attention, memory, and executive function...
May 22, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29785863/hyperbaric-oxygen-inhibits-production-of-cd3-t-cells-in-the-thymus-and-facilitates-malignant-glioma-cell-growth
#8
Yong-Gang Wang, Jiang Long, Dong-Chuan Shao, Hai Song
Objective Hyperbaric oxygen (HBO) is an emerging complementary alternative medical approach in glioma treatment. However, its mode of action is unknown, so this was investigated in the present study. Methods We constructed an intracranial glioma model of congenic C57BL/6J mice. Glioma growth under HBO stimulation was assessed by bioluminescent imaging and magnetic resonance imaging. Flow cytometry assessed direct effects of HBO on reactive oxygen species (ROS) signaling of transplanted glioma cells and organs, and quantified mature T cells and subgroups in tumors, the brain, and blood...
January 1, 2018: Journal of International Medical Research
https://www.readbyqxmd.com/read/29785793/outcomes-associated-with-fetal-parvovirus-b19-infection-a-systematic-review-and-meta-analysis
#9
REVIEW
Francesca Bascietto, Marco Liberati, Daniela Murgano, Danilo Buca, Antonia Iacovelli, Maria Elena Flacco, Lamberto Manzoli, Alessandra Familiari, Giovanni Scambia, Francesco D'Antonio
OBJECTIVE: To explore the outcome of fetuses affected by congenital Parvovirus B19 (PB19) Infection. METHODS: The outcomes observed were: miscarriage, perinatal death (PND), intra-uterine death (IUD), neonatal death (NND), spontaneous resolution of hydrops or fetal anemia, intra-uterine transfusion (IUT), resolution of hydrops or anemia after transfusion, fetal loss following transfusion, abnormal brain scan after birth, abnormal neurodevelopmental outcome. All the observed outcomes were reported in fetuses presenting and in those not presenting signs of hydrops on ultrasound...
May 22, 2018: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/29785624/longitudinal-neuroimaging-hippocampal-markers-for-diagnosing-alzheimer-s-disease
#10
Carlos Platero, Lin Lin, M Carmen Tobar
Hippocampal atrophy measures from magnetic resonance imaging (MRI) are powerful tools for monitoring Alzheimer's disease (AD) progression. In this paper, we introduce a longitudinal image analysis framework based on robust registration and simultaneous hippocampal segmentation and longitudinal marker classification of brain MRI of an arbitrary number of time points. The framework comprises two innovative parts: a longitudinal segmentation and a longitudinal classification step. The results show that both steps of the longitudinal pipeline improved the reliability and the accuracy of the discrimination between clinical groups...
May 21, 2018: Neuroinformatics
https://www.readbyqxmd.com/read/29785469/early-detection-of-cerebral-infarction-after-focal-ischemia-using-a-new-mri-indicator
#11
Yukako Nakajo, Qiang Zhao, Jun-Ichiro Enmi, Hidehiro Iida, Jun C Takahashi, Hiroharu Kataoka, Keiko Yamato, Hiroji Yanamoto
Prolongation of the T2 relaxation time, an increase in T2-weighted signal intensity (T2-SI), and a decrease in the apparent diffusion coefficient (ADC) calculated from diffusion-weighted images (DWI) on magnetic resonance imaging (MRI) are conventional indicators of the vasogenic (interstitial) or cytotoxic (cellular) cerebral edema that develops after ischemic stroke. However, these parameters obtained on stroke imaging have not given us a precise threshold at which we can determine the viability or vulnerability of the tissue, allowing us to decide on an intervention that will help reversible tissue in the acute phase...
May 21, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29785360/identical-patterns-of-cortico-efferent-tract-involvement-in-primary-lateral-sclerosis-and-amyotrophic-lateral-sclerosis-a-tract-of-interest-based-mri-study
#12
Hans-Peter Müller, Martin Gorges, Rebecca Kassubek, Johannes Dorst, Albert C Ludolph, Jan Kassubek
Background: There is an ongoing debate whether primary lateral sclerosis (PLS) should be regarded as an independent disease entity separate from amyotrophic lateral sclerosis (ALS) or as a slowly progressive variant of ALS. Objective: The study was designed to investigate specific white matter alterations in diffusion tensor imaging (DTI) data from PLS patients by a hypothesis-guided tract-of-interest-based approach compared with 'classical' ALS patients and healthy controls, in order to identify microstructural changes according to the neuropathologically defined ALS affectation pattern in vivo...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29785359/white-matter-microstructure-white-matter-lesions-and-hypertension-an-examination-of-early-surrogate-markers-of-vascular-related-brain-change-in-midlife
#13
Thaddeus Haight, R Nick Bryan, Guray Erus, Meng-Kang Hsieh, Christos Davatzikos, Ilya Nasrallah, Mark D'Esposito, David R Jacobs, Cora Lewis, Pamela Schreiner, Stephen Sidney, Osorio Meirelles, Lenore J Launer
Objective: We examined imaging surrogates of white matter microstructural abnormalities which may precede white matter lesions (WML) and represent a relevant marker of cerebrovascular injury in adults in midlife. Methods: In 698 community-dwelling adults (mean age 50 years ±3.5 SD) from the Coronary Artery Risk Development in Young Adults (CARDIA) Brain MRI sub-study, WML were identified on structural MR and fractional anisotropy (FA), representing WM microstructural integrity, was derived using Diffusion Tensor Imaging...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29785317/a-rare-case-of-penile-metastases-as-a-harbinger-of-primary-pulmonary-adenosquamous-carcinoma
#14
Partha Hota, Tejas N Patel, Xiaofeng Zhao, Carrie Schneider, Omar Agosto
Although lung cancer has a high propensity for distant metastatic disease, penile metastases from primary lung neoplasms are considered particularly rare. A 71-year-old male presented to our hospital with a rapidly enlarging hard palpable penile mass. MR imaging demonstrated two penile masses centered in the left and right corpus cavernosa. Subsequent CT imaging revealed a spiculated pulmonary mass in the right upper lobe with PET/CT, MRI, and surgical exploration, demonstrating evidence of metastases to the left adrenal gland, right subscapularis muscle, brain, and small bowel...
2018: Case Reports in Radiology
https://www.readbyqxmd.com/read/29785287/lymph-node-dissection-during-sublobar-resection-why-when-and-how
#15
REVIEW
Pascal-Alexandre Thomas
Appropriate lymph node (LN) assessment is a hallmark of surgical quality of curative intent operations for non-small cell lung cancer (NSCLC). Even in the era of extensive pre-treatment work-up including routine PET-scanning and brain imaging, and selective invasive LN evaluation, unexpected LN metastases are found at surgery in more than 10% of patients with a cT1aN0 tumor. Systematic lymphadenectomy minimizes the risk of leaving tumor-LN behind and thus the risk of an incomplete resection, and provides the most truthful pTNM, which is decisive in directing adjuvant chemotherapy...
April 2018: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29785226/progressive-assessment-of-ischemic-injury-to-white-matter-using-diffusion-tensor-imaging-a-preliminary-study-of-a-macaque-model-of-stroke
#16
Xiaodong Zhang, Yumei Yan, Frank Tong, Chun-Xia Li, Benjamin Jones, Silun Wang, Yuguang Meng, E Chris Muly, Doty Kempf, Leonard Howell
Background: Previous Diffusion Tensor Imaging (DTI) studies have demonstrated the temporal evolution of stroke injury in grey matter and white matter can be characterized by DTI indices. However, it still remains not fully understood how the DTI indices of white matter are altered progressively during the hyperacute (first 6 hours) and acute stage of stroke (≤ 1 week). In the present study, DTI was employed to characterize the temporal evolution of infarction and white matter injury after stroke insult using a macaque model with permanent ischemic occlusion...
2018: Open Neuroimaging Journal
https://www.readbyqxmd.com/read/29785155/the-volume-of-the-cerebellum-in-the-second-semester-of-gestation
#17
Damiana Vulturar, Alexandru Fărcăşanu, Flaviu Turcu, Dan Boitor, Carmen Crivii
Background and aims: The cerebellum ("little brain"), the largest part of hind brain, lies in the posterior cranial fossa, beneath the occipital lobe and dorsal to the brainstem. It develops over a long period: it is one of the first structures in the brain to begin to differentiate, but one of the last to mature. The use of ultrasonography has significantly improved the evaluation of fetal growth and development and has permitted prenatal diagnosis of a variety of congenital malformations...
2018: Clujul Medical (1957)
https://www.readbyqxmd.com/read/29785110/prefrontoparietal-dysfunction-during-emotion-regulation-in-anxiety-disorder-a-meta-analysis-of-functional-magnetic-resonance-imaging-studies
#18
Hai-Yang Wang, Xiao-Xia Zhang, Cui-Ping Si, Yang Xu, Qian Liu, He-Tao Bian, Bing-Wei Zhang, Xue-Lin Li, Zhong-Rui Yan
Objective: Impairments in emotion regulation, and more specifically in cognitive reappraisal, are thought to play a key role in the pathogenesis of anxiety disorders. However, the available evidence on such deficits is inconsistent. To further illustrate the neurobiological underpinnings of anxiety disorder, the present meta-analysis summarizes functional magnetic resonance imaging (fMRI) findings for cognitive reappraisal tasks and investigates related brain areas. Methods: We performed a comprehensive series of meta-analyses of cognitive reappraisal fMRI studies contrasting patients with anxiety disorder with healthy control (HC) subjects, employing an anisotropic effect-size signed differential mapping approach...
2018: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/29784920/video-rate-volumetric-neuronal-imaging-using-3d-targeted-illumination
#19
Sheng Xiao, Hua-An Tseng, Howard Gritton, Xue Han, Jerome Mertz
Fast volumetric microscopy is required to monitor large-scale neural ensembles with high spatio-temporal resolution. Widefield fluorescence microscopy can image large 2D fields of view at high resolution and speed while remaining simple and costeffective. A focal sweep add-on can further extend the capacity of widefield microscopy by enabling extended-depth-of-field (EDOF) imaging, but suffers from an inability to reject out-of-focus fluorescence background. Here, by using a digital micromirror device to target only in-focus sample features, we perform EDOF imaging with greatly enhanced contrast and signal-to-noise ratio, while reducing the light dosage delivered to the sample...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29784826/deletion-of-lrrtm1-and-lrrtm2-in-adult-mice-impairs-basal-ampa-receptor-transmission-and-ltp-in-hippocampal-ca1-pyramidal-neurons
#20
Mehdi Bhouri, Wade Morishita, Paul Temkin, Debanjan Goswami, Hiroshi Kawabe, Nils Brose, Thomas C Südhof, Ann Marie Craig, Tabrez J Siddiqui, Robert Malenka
Leucine-rich repeat transmembrane (LRRTM) proteins are synaptic cell adhesion molecules that influence synapse formation and function. They are genetically associated with neuropsychiatric disorders, and via their synaptic actions likely regulate the establishment and function of neural circuits in the mammalian brain. Here, we take advantage of the generation of a LRRTM1 and LRRTM2 double conditional knockout mouse ( LRRTM1,2 cKO) to examine the role of LRRTM1,2 at mature excitatory synapses in hippocampal CA1 pyramidal neurons...
May 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
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