Read by QxMD icon Read

dwi brain

Hidehito Kimura, Masaaki Taniguchi, Tatsuya Mori, Kohkichi Hosoda, Eiji Kohmura
We present a rare case of a patient suffering temporary aphasia after an extracranial-to-intracranial (EC-IC) bypass surgery, which was shown as a transient hypointense lesion on diffusion-weighted imaging (DWI) with increased apparent diffusion coefficient (ADC) value, evidence of postoperative hyperperfusion. Postoperative hyperperfusion syndrome after EC-IC bypass causing temporary neurological deterioration has been reported rarely as isosignal intensity on DWI with hyperintense lesion on T2-weighted image and fluid-attenuated inversion recovery (FLAIR) image as an expression of vasogenic edema...
October 14, 2016: World Neurosurgery
Guillaume Marrelec, Arnaud Messé, Alain Giron, David Rudrauf
Brain computation relies on effective interactions between ensembles of neurons. In neuroimaging, measures of functional connectivity (FC) aim at statistically quantifying such interactions, often to study normal or pathological cognition. Their capacity to reflect a meaningful variety of patterns as expected from neural computation in relation to cognitive processes remains debated. The relative weights of time-varying local neurophysiological dynamics versus static structural connectivity (SC) in the generation of FC as measured remains unsettled...
October 2016: PLoS Computational Biology
Da-Zhen Jiang, Ding-Yi Zhou, Wei-Qing Wu, Guang-Yao Wu, Hong Quan
BACKGROUND: Magnetic resonance imaging (MRI) and functional MRI techniques have been widely used in the diagnosis of human immunodeficiency virus (HIV) infection related diseases. PURPOSE: To explore whether magnetic resonance diffusion-weighted imaging (DWI) can track water molecular diffusion changes in the brain of asymptomatic HIV-positive adolescents. MATERIAL AND METHODS: Multi-b value DWI was performed in 23 adolescents, including 15 HIV-positive participants and eight HIV-negative healthy participants...
October 12, 2016: Acta Radiologica
Yoshihito Kadota, Toshinori Hirai, Hideo Nakamura, Keishi Makino, Shigetoshi Yano, Shinichiro Nishimura, Machiko Tateishi, Minako Azuma, Mika Kitajima, Yasuyuki Yamashita
PURPOSE: We aimed to determine whether 3T diffusion-weighted imaging (DWI) has an additive value relative to contrast-enhanced MR imaging for the detection of disseminated lesions in patients with primary malignant brain tumors. METHODS: We included consecutive 12 patients with nodular disseminated lesions of primary malignant brain tumors that were confirmed by surgery or follow-up MR imaging. All underwent conventional MR imaging, DWI at b = 1000 and 3000 s/mm(2), post-contrast T1-weighted and 3D gradient-echo imaging at 3T...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Laurie M Baker, Ryan P Cabeen, Sarah Cooley, David H Laidlaw, Robert H Paul
This paper reviews basic methods and recent applications of length-based fiber bundle analysis of cerebral white matter using diffusion magnetic resonance imaging (dMRI). Diffusion weighted imaging (DWI) is a dMRI technique that uses the random motion of water to probe tissue microstructure in the brain. Diffusion tensor imaging (DTI) is an extension of DWI that measures the magnitude and direction of water diffusion in cerebral white matter, using either voxel-based scalar metrics or tractography-based analyses...
April 2016: Technology and Innovation
Satoshi Yokoi, Keizo Yasui, Yasuhiro Hasegawa, Kazuki Niwa, Yoshinori Noguchi, Toyonori Tsuzuki, Maya Mimuro, Jun Sone, Hirohisa Watanabe, Masahisa Katsuno, Mari Yoshida, Gen Sobue
AIMS: Neuronal intranuclear inclusion disease (NIID) is a rare neurodegenerative disorder with eosinophilic intranuclear inclusion bodies. The variable symptoms of NIID increase the difficulty in an antemortem diagnosis. NIID shows leukoencephalopathy on brain magnetic resonance imaging MRI, but the significance of the radiological findings have not been clarified. METHODS: We examined an autopsied case of NIID with subcortical linear hyperintensities on diffusion weighted imaging (DWI) and leukoencephalopathy on fluid attenuation inversion recovery (FLAIR) imaging...
October 10, 2016: Clinical Neuropathology
Claudia Barth, Christopher J Steele, Karsten Mueller, Vivien P Rekkas, Katrin Arélin, Andre Pampel, Inga Burmann, Jürgen Kratzsch, Arno Villringer, Julia Sacher
Sex hormones fluctuate during the menstrual cycle. Evidence from animal studies suggests similar subtle fluctuations in hippocampal structure, predominantly linked to estrogen. Hippocampal abnormalities have been observed in several neuropsychiatric pathologies with prominent sexual dimorphism. Yet, the potential impact of subtle sex-hormonal fluctuations on human hippocampal structure in health is unclear. We tested the feasibility of longitudinal neuroimaging in conjunction with rigorous menstrual cycle monitoring to evaluate potential changes in hippocampal microstructure associated with physiological sex-hormonal changes...
October 7, 2016: Scientific Reports
Owen J Arthurs, A Rega, F Guimiot, N Belarbi, J Rosenblatt, V Biran, M Elmaleh, G Sebag, M Alison
OBJECTIVES: Diffusion weighted magnetic resonance imaging (DWI) is a sensitive method to assess brain maturation or detect brain lesions, providing Apparent Diffusion Coefficient (ADC) values as a measure of water diffusion. Abnormal ADC values are seen in ischemic brain lesions, such as acute or chronic hypoxia. The aim of this study was to assess whether ADC values in the fetal brain were different in a group of fetuses exposed to severe vascular intrauterine growth restriction, compared to normal controls...
October 5, 2016: Ultrasound in Obstetrics & Gynecology
Bruce A Bowser, Norbert G Campeau, Carrie M Carr, Felix E Diehn, Jennifer S McDonald, Gary M Miller, Timothy J Kaufmann
INTRODUCTION: Ferumoxytol (Feraheme) is a parenteral therapy approved for treatment of iron deficiency anemia. The product insert for ferumoxytol states that it may affect the diagnostic ability of MRI for up to 3 months. However, the expected effects may not be commonly recognized among clinical neuroradiologists. Our purpose is to describe the artifacts we have seen at our institution during routine clinical practice. METHODS: We reviewed the patients at our institution that had brain MRI performed within 90 days of receiving intravenous ferumoxytol...
October 4, 2016: Neuroradiology
Simona Gaudino, Rosellina Russo, Tommaso Verdolotti, Massimo Caulo, Cesare Colosimo
INTRODUCTION: Advanced magnetic resonance imaging (MRI) techniques is an umbrella term that includes diffusion (DWI) and diffusion tensor (DTI), perfusion (PWI), spectroscopy (MRS), and functional (fMRI) imaging. These advanced modalities have improved the imaging of brain tumors and provided valuable additional information for treatment planning. Despite abundant literature on advanced MRI techniques in adult brain tumors, few reports exist for pediatric brain ones, potentially because of technical challenges...
October 2016: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
M Laible, M Möhlenbruch, S Horstmann, J Pfaff, N A Geis, S Pleger, S Schüler, T Rizos, M Bendszus, R Veltkamp
BACKGROUND AND PURPOSE: To determine the rate of peri-interventional silent brain infarcts after left atrial appendage occlusion (LAAO). METHODS: In this prospective, uncontrolled single-center pilot study, consecutive patients with atrial fibrillation undergoing LAAO between July 2013 and January 2016 were included. The Amplatzer Cardiac Plug, WATCHMAN or Amulet device was used. A neurological examination and cranial magnetic resonance imaging (MRI) were performed within 48 h before and after the procedure...
September 19, 2016: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
Tanja Schneider, Tobias Mahraun, Julian Schroeder, Andreas Frölich, Philip Hoelter, Marlies Wagner, Jean Darcourt, Christophe Cognard, Alain Bonafé, Jens Fiehler, Susanne Siemonsen, Jan-Hendrik Buhk
PURPOSE: The presence of intraparenchymal hyperattenuations (IPH) on flat-panel computed tomography (FP-CT) after endovascular recanalization in stroke patients is a common phenomenon. They are thought to occur in ischemic areas with breakdown of the blood-brain barrier but previous studies that investigated a mutual interaction are scarce. We aimed to assess the relationship of IPH localization with prethrombectomy diffusion-weighted imaging (DWI) lesions. METHODS: This retrospective multicenter study included 27 acute stroke patients who underwent DWI prior to FP-CT following mechanical thrombectomy...
September 16, 2016: Clinical Neuroradiology
Ching Chung Ko, Ming Hong Tai, Chien Feng Li, Tai Yuan Chen, Jeon Hor Chen, Ginger Shu, Yu Ting Kuo, Yu Chang Lee
The differentiation between glioblastoma multiforme (GBM) and primary cerebral lymphoma (PCL) is important because the treatments are substantially different. The purpose of this article is to describe the MR imaging characteristics of GBM and PCL with emphasis on the quantitative ADC analysis in the tumor necrosis, the most strongly-enhanced tumor area, and the peritumoral edema. This retrospective cohort study collected 104 GBM (WHO grade IV) patients and 22 immune-competent PCL (diffuse large B cell lymphoma) patients...
2016: PloS One
Eunmi Lee, Ji Eun Park, Mayu Iida, Tomoya Fujie, Toshiyuki Kaji, Gaku Ichihara, Young Cheol Weon, Yangho Kim
We report the clinical and neuroimaging findings of 4 men who worked in the production of inorganic metal tin ingot from organotin scrap who presented with similar episodes of reversible amnesia. T2-weighted-fluid-attenuated inversion recovery magnetic resonance imaging (FLAIR MRI) scans in 3 of the patients showed symmetric hyperintensity in the frontoparietal periventricular white matter and the corpus callosum, and reduced apparent diffusion coefficients (ADCs) based on diffusion weighted imaging (DWI). One patient had symmetric faint hyperintensity in the parietal periventricular white matter only in the FLAIR images...
September 11, 2016: Neurotoxicology
Oren S Cohen, Joab Chapman, Amos D Korczyn, Oliver L Siaw, Naama Warman-Alaluf, Zeev Nitsan, Shmuel Appel, Esther Kahana, Hanna Rosenmann, Chen Hoffmann
The use of diffusion MRI improved the accuracy of diagnosis in Creutzfeldt-Jakob disease (CJD) and expanded our knowledge of the changes occurring in the brain during the disease. The aim of this study was to test whether in patients with E200K familial CJD (fCJD) the clinical severity correlates with the disease burden as reflected by the extent of cortical involvement in DWI MRI. Consecutive fCJD patients were examined by a neurologist who performed several tests including the CJD neurological scale (CJD-NS), MiniMental status examination (MMSE), Frontal Assessment Battery (FAB), NIH Stroke Scale (NIHSS), and the expanded disability status scale (EDSS)...
September 13, 2016: Journal of Neural Transmission
Yoram Cohen, Debbie Anaby, Darya Morozov
Diffusion MRI is extensively used to study brain microarchitecture and pathologies, and water diffusion appears highly anisotropic in the white matter (WM) of the spinal cord (SC). Despite these facts, the use of diffusion MRI to study the SC, which has increased in recent years, is much less common than that in the brain. In the present review, after a brief outline of early studies of diffusion MRI (DWI) and diffusion tensor MRI (DTI) of the SC, we provide a short survey on DTI and on diffusion MRI methods beyond the tensor that have been used to study SC microstructure and pathologies...
September 6, 2016: NMR in Biomedicine
Asaf Honig, Ruth Eliahou, Roni Eichel, Ari Aharon Shemesh, Tamir Ben-Hur, Eitan Auriel
Bilateral thalamic infarction (BTI) typically presents as a sleep-like coma (SLC) without localizing signs, posing a diagnostic challenge that may lead the treating physician to search for toxic or metabolic causes and delay treatment. We review our experience with BTI of different etiologies, and emphasize the critical role of timely imaging, diagnosis, and management in a series of 12 patients with a presentation of SLC and acute BTI who were managed in our Medical Centers from 2006-2015. In 11/12, urgent head CT scans showed normal brain tissue, while diffusion-weighted (DWI) MRI revealed symmetric bilateral thalamic hyperintense lesions with variable degrees of brainstem involvement...
September 1, 2016: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
Tieli Liu, Yunpeng Han, Lemei Tang, Jianlin Wu, Yanwei Miao, Bingbing Gao, Jin Shang
The aim of the study was to evaluate the performance of parameters obtained from diffusion-weighted imaging (DWI) with multiple b values in the detection of chronic brain damage in patients with type 2 diabetes.We enrolled 30 patients with or without abnormalities on brain magnetic resonance imaging (lacunar infarction, leukoaraiosis, and/or brain atrophy) and 15 nondiabetic controls; obtained DWI parameters that included apparent diffusion coefficient (ADC), fast ADC (ADCfast), slow ADC (ADCslow), fraction of fast ADC (f), distributed diffusion coefficient (DDC), and stretched exponential (α); and performed receiver operating characteristic (ROC) analysis to evaluate the performance of parameters for the detection of chronic brain damage...
August 2016: Medicine (Baltimore)
Akio Ogura, Isamu Hatano, Kohki Osakabe, Natsumi Yamaguchi, Daisuke Koyama, Haruyuki Watanabe
OBJECTIVE: The purpose of this study is to examine how the fractional b value affects the calculation of apparent diffusion coefficient (ADC) using DWI. The fractional b value is the point of intersection between the fast and slow components of biexponential decay in DWI. SUBJECTS AND METHODS: Human brains were imaged using multiple b values on echo-planar DWI. The ADCs of white matter, gray matter, and thalamus were calculated using the combination of b values by two-point and multipoint methods, and the characteristics of each ADC value were compared...
August 31, 2016: AJR. American Journal of Roentgenology
Rahul Dimber, Qi Guo, Courtney Bishop, Adine Adonis, Aisling Buckley, Agnes Kocsis, David Owen, Nicola Kalk, Rexford Newbould, Roger Gunn, Eugenii Rabiner, Graham P Taylor
: HAM is a chronic debilitating neuroinflammatory disease with a predilection for the thoracic cord. Tissue damage is attributed to the cellular immune response to HTLV-1 infected lymphocytes. Using a specific 18KDa Translocator Protein ligand, [(11)C] PBR28, T1-weighted and Diffusion Weighted magnetic resonance imaging, the brains of HTLV-1 infected patients, with and without HAM but no clinical evidence of brain involvement, were examined. METHODS: Five subjects with HAM and two HTLV-1 asymptomatic carriers (AC) were studied...
August 25, 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
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"