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https://www.readbyqxmd.com/read/28578156/apoe-influences-regional-white-matter-axonal-density-loss-in-alzheimer-s-disease
#1
Catherine F Slattery, Jiaying Zhang, Ross W Paterson, Alexander J M Foulkes, Amelia Carton, Kirsty Macpherson, Laura Mancini, David L Thomas, Marc Modat, Nicolas Toussaint, David M Cash, John S Thornton, Susie M D Henley, Sebastian J Crutch, Daniel C Alexander, Sebastien Ourselin, Nick C Fox, Hui Zhang, Jonathan M Schott
Mechanisms underlying phenotypic heterogeneity in young onset Alzheimer disease (YOAD) are poorly understood. We used diffusion tensor imaging and neurite orientation dispersion and density imaging (NODDI) with tract-based spatial statistics to investigate apolipoprotein (APOE) ε4 modulation of white-matter damage in 37 patients with YOAD (22, 59% APOE ε4 positive) and 23 age-matched controls. Correlation between neurite density index (NDI) and neuropsychological performance was assessed in 4 white-matter regions of interest...
May 3, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28560158/application-and-evaluation-of-noddi-in-the-cervical-spinal-cord-of-multiple-sclerosis-patients
#2
Samantha By, Junzhong Xu, Bailey A Box, Francesca R Bagnato, Seth A Smith
INTRODUCTION: There is a need to develop imaging methods sensitive to axonal injury in multiple sclerosis (MS), given the prominent impact of axonal pathology on disability and outcome. Advanced multi-compartmental diffusion models offer novel indices sensitive to white matter microstructure. One such model, neurite orientation dispersion and density imaging (NODDI), is sensitive to neurite morphology, providing indices of apparent volume fractions of axons (vin), isotropic water (viso) and the dispersion of fibers about a central axis (orientation dispersion index, ODI)...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28556431/white-matter-microstructure-in-athletes-with-a-history-of-concussion-comparing-diffusion-tensor-imaging-dti-and-neurite-orientation-dispersion-and-density-imaging-noddi
#3
Nathan W Churchill, Eduardo Caverzasi, Simon J Graham, Michael G Hutchison, Tom A Schweizer
Sport concussion is associated with disturbances in brain function in the absence of gross anatomical lesions, and may have long-term health consequences. Diffusion-weighted magnetic resonance imaging (MRI) methods provide a powerful tool for investigating alterations in white matter microstructure reflecting the long-term effects of concussion. In a previous study, diffusion tensor imaging (DTI) showed that athletes with a history of concussion had elevated fractional anisotropy (FA) and reduced mean diffusivity (MD) parameters...
May 29, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28542258/bycatch-in-the-maldivian-pole-and-line-tuna-fishery
#4
Kelsey I Miller, Ibrahim Nadheeh, A Riyaz Jauharee, R Charles Anderson, M Shiham Adam
Tropical tuna fisheries are among the largest worldwide, with some having significant bycatch issues. However, pole-and-line tuna fisheries are widely believed to have low bycatch rates, although these have rarely been quantified. The Maldives has an important pole-and-line fishery, targeting skipjack tuna (Katsuwonus pelamis). In the Maldives, 106 pole-and-line tuna fishing days were observed between August 2014 and November 2015. During 161 fishing events, tuna catches amounted to 147 t: 72% by weight was skipjack, 25% yellowfin tuna (Thunnus albacares) and 3% other tunas...
2017: PloS One
https://www.readbyqxmd.com/read/28532604/validation-of-dwi-pre-processing-procedures-for-reliable-differentiation-between-human-brain-gliomas
#5
Sebastian Vellmer, Aram S Tonoyan, Dieter Suter, Igor N Pronin, Ivan I Maximov
Diffusion magnetic resonance imaging (dMRI) is a powerful tool in clinical applications, in particular, in oncology screening. dMRI demonstrated its benefit and efficiency in the localisation and detection of different types of human brain tumours. Clinical dMRI data suffer from multiple artefacts such as motion and eddy-current distortions, contamination by noise, outliers etc. In order to increase the image quality of the derived diffusion scalar metrics and the accuracy of the subsequent data analysis, various pre-processing approaches are actively developed and used...
May 19, 2017: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/28491462/understanding-microstructure-of-the-brain-by-comparison-of-neurite-orientation-dispersion-and-density-imaging-noddi-with-transparent-mouse-brain
#6
Kanako Sato, Aurelien Kerever, Koji Kamagata, Kohei Tsuruta, Ryusuke Irie, Kazuhiko Tagawa, Hitoshi Okazawa, Eri Arikawa-Hirasawa, Nobuhiro Nitta, Ichio Aoki, Shigeki Aoki
BACKGROUND: Neurite orientation dispersion and density imaging (NODDI) is a diffusion magnetic resonance imaging (MRI) technique with the potential to visualize the microstructure of the brain. Revolutionary histological methods to render the mouse brain transparent have recently been developed, but verification of NODDI by these methods has not been reported. PURPOSE: To confirm the concordance of NODDI with histology in terms of density and orientation dispersion of neurites of the brain...
April 2017: Acta Radiologica Open
https://www.readbyqxmd.com/read/28470878/gray-matter-abnormalities-in-idiopathic-parkinson-s-disease-evaluation-by-diffusional-kurtosis-imaging-and-neurite-orientation-dispersion-and-density-imaging
#7
Koji Kamagata, Andrew Zalesky, Taku Hatano, Ryo Ueda, Maria Angelique Di Biase, Ayami Okuzumi, Keigo Shimoji, Masaaki Hori, Karen Caeyenberghs, Christos Pantelis, Nobutaka Hattori, Shigeki Aoki
Mapping gray matter (GM) pathology in Parkinson's disease (PD) with conventional MRI is challenging, and the need for more sensitive brain imaging techniques is essential to facilitate early diagnosis and assessment of disease severity. GM microstructure was assessed with GM-based spatial statistics applied to diffusion kurtosis imaging (DKI) and neurite orientation dispersion imaging (NODDI) in 30 participants with PD and 28 age- and gender-matched controls. These were compared with currently used assessment methods such as diffusion tensor imaging (DTI), voxel-based morphometry (VBM), and surface-based cortical thickness analysis...
May 4, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28457975/robust-and-fast-nonlinear-optimization-of-diffusion-mri-microstructure-models
#8
R L Harms, F J Fritz, A Tobisch, R Goebel, A Roebroeck
Advances in biophysical multi-compartment modeling for diffusion MRI (dMRI) have gained popularity because of greater specificity than DTI in relating the dMRI signal to underlying cellular microstructure. A large range of these diffusion microstructure models have been developed and each of the popular models comes with its own, often different, optimization algorithm, noise model and initialization strategy to estimate its parameter maps. Since data fit, accuracy and precision is hard to verify, this creates additional challenges to comparability and generalization of results from diffusion microstructure models...
April 27, 2017: NeuroImage
https://www.readbyqxmd.com/read/28348958/diffusion-imaging-of-reversible-and-irreversible-microstructural-changes-within-the-corticospinal-tract-in-idiopathic-normal-pressure-hydrocephalus
#9
Kouhei Kamiya, Masaaki Hori, Ryusuke Irie, Masakazu Miyajima, Madoka Nakajima, Koji Kamagata, Kouhei Tsuruta, Asami Saito, Misaki Nakazawa, Yuichi Suzuki, Harushi Mori, Akira Kunimatsu, Hajime Arai, Shigeki Aoki, Osamu Abe
The symptoms of idiopathic normal pressure hydrocephalus (iNPH) can be improved by shunt surgery, but prediction of treatment outcome is not established. We investigated changes of the corticospinal tract (CST) in iNPH before and after shunt surgery by using diffusion microstructural imaging, which infers more specific tissue properties than conventional diffusion tensor imaging. Two biophysical models were used: neurite orientation dispersion and density imaging (NODDI) and white matter tract integrity (WMTI)...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28166941/keeping-it-regular-development-of-thermoregulation-in-four-tropical-seabird-species
#10
Lorinda A Hart, Colleen T Downs, Mark Brown
The thermoregulatory capacity of a species can determine which climatic niche it occupies. Its development in avian chicks is influenced by numerous factors. Furthermore, it is suggested that altricial chicks develop their thermoregulatory capacity post-hatching, while precocial chicks develop aspects of this in the egg. We investigated the development of thermoregulation of four co-occurring seabird species in the Seychelles; namely white, ground-nesting white-tailed tropicbirds (Phaethon lepturus) and tree-nesting fairy terns (Gygis alba); and dark plumaged, tree-nesting lesser noddies (Anous tenuirostris) and ground- and tree-nesting brown noddies (A...
February 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28090658/analysis-of-the-effects-of-noise-dwi-sampling-and-value-of-assumed-parameters-in-diffusion-mri-models
#11
Elizabeth B Hutchinson, Alexandru V Avram, M Okan Irfanoglu, C Guan Koay, Alan S Barnett, Michal E Komlosh, Evren Özarslan, Susan C Schwerin, Sharon L Juliano, Carlo Pierpaoli
PURPOSE: This study was a systematic evaluation across different and prominent diffusion MRI models to better understand the ways in which scalar metrics are influenced by experimental factors, including experimental design (diffusion-weighted imaging [DWI] sampling) and noise. METHODS: Four diffusion MRI models-diffusion tensor imaging (DTI), diffusion kurtosis imaging (DKI), mean apparent propagator MRI (MAP-MRI), and neurite orientation dispersion and density imaging (NODDI)-were evaluated by comparing maps and histogram values of the scalar metrics generated using DWI datasets obtained in fixed mouse brain with different noise levels and DWI sampling complexity...
January 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28087489/neurite-density-index-is-sensitive-to-age-related-differences-in-the-developing-brain
#12
Sila Genc, Charles B Malpas, Scott K Holland, Richard Beare, Timothy J Silk
PURPOSE: White matter development during childhood and adolescence is characterised by increasing white matter coherence and organisation. Commonly used scalar metrics, such as fractional anisotropy (FA), are sensitive to multiple mechanisms of white matter change and therefore unable to distinguish between mechanisms that change during development. We investigate the relationship between age and neurite density index (NDI) from neurite orientation dispersion and density imaging (NODDI), and the age-classification accuracy of NDI compared with FA, in a developmental cohort...
January 11, 2017: NeuroImage
https://www.readbyqxmd.com/read/28002426/assessing-microstructural-substrates-of-white-matter-abnormalities-a-comparative-study-using-dti-and-noddi
#13
Inge Timmers, Alard Roebroeck, Matteo Bastiani, Bernadette Jansma, Estela Rubio-Gozalbo, Hui Zhang
Neurite orientation dispersion and density imaging (NODDI) enables more specific characterization of tissue microstructure by estimating neurite density (NDI) and orientation dispersion (ODI), two key contributors to fractional anisotropy (FA). The present work compared NODDI- with diffusion tensor imaging (DTI)-derived indices for investigating white matter abnormalities in a clinical sample. We assessed the added value of NODDI parameters over FA, by contrasting group differences identified by both models...
2016: PloS One
https://www.readbyqxmd.com/read/27903438/neurite-density-imaging-versus-imaging-of-microscopic-anisotropy-in-diffusion-mri-a-model-comparison-using-spherical-tensor-encoding
#14
Björn Lampinen, Filip Szczepankiewicz, Johan Mårtensson, Danielle van Westen, Pia C Sundgren, Markus Nilsson
In diffusion MRI (dMRI), microscopic diffusion anisotropy can be obscured by orientation dispersion. Separation of these properties is of high importance, since it could allow dMRI to non-invasively probe elongated structures such as neurites (axons and dendrites). However, conventional dMRI, based on single diffusion encoding (SDE), entangles microscopic anisotropy and orientation dispersion with intra-voxel variance in isotropic diffusivity. SDE-based methods for estimating microscopic anisotropy, such as the neurite orientation dispersion and density imaging (NODDI) method, must thus rely on model assumptions to disentangle these features...
February 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/27898701/assessing-white-matter-microstructure-in-brain-regions-with-different-myelin-architecture-using-mri
#15
Samuel Groeschel, Gisela E Hagberg, Thomas Schultz, Dávid Z Balla, Uwe Klose, Till-Karsten Hauser, Thomas Nägele, Oliver Bieri, Thomas Prasloski, Alex L MacKay, Ingeborg Krägeloh-Mann, Klaus Scheffler
OBJECTIVE: We investigate how known differences in myelin architecture between regions along the cortico-spinal tract and frontal white matter (WM) in 19 healthy adolescents are reflected in several quantitative MRI parameters that have been proposed to non-invasively probe WM microstructure. In a clinically feasible scan time, both conventional imaging sequences as well as microstructural MRI parameters were assessed in order to quantitatively characterise WM regions that are known to differ in the thickness of their myelin sheaths, and in the presence of crossing or parallel fibre organisation...
2016: PloS One
https://www.readbyqxmd.com/read/27787666/neurite-orientation-dispersion-and-density-imaging-for-evaluation-of-corticospinal-tract-in-idiopathic-normal-pressure-hydrocephalus
#16
Ryusuke Irie, Kohei Tsuruta, Masaaki Hori, Michimasa Suzuki, Koji Kamagata, Atsushi Nakanishi, Kouhei Kamiya, Madoka Nakajima, Masakazu Miyajima, Hajime Arai, Shigeki Aoki
PURPOSE: To evaluate diffusional changes of the corticospinal tract (CST) in patients with idiopathic normal pressure hydrocephalus (iNPH) by neurite orientation dispersion and density imaging (NODDI). MATERIALS AND METHODS: Nineteen patients with iNPH and 12 healthy controls were included. Diffusion MRI data for NODDI were acquired with a 3-T system, using 32 motion-probing gradient directions with six b-values (from 0 to 2500 s/mm(2)). The orientation dispersion index (ODI), intra-cellular volume fraction (Vic), and isotropic volume fraction (Viso) of the CST were calculated by tract-specific analysis in patients and controls...
October 27, 2016: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/27477113/noddi-reproducibility-and-variability-with-magnetic-field-strength-a-comparison-between-1-5-t-and-3-t
#17
Ai Wern Chung, Kiran K Seunarine, Chris A Clark
Diffusion models are advantageous for examining brain microstructure non-invasively and their validation is important for transference into the clinical domain. Neurite Orientation Dispersion and Density Imaging (NODDI) is a promising model for estimating multiple diffusion compartments from MRI data acquired in a clinically feasible time. As a relatively new model, it is necessary to examine NODDI under certain experimental conditions, such as change in magnetic field-strength, and assess it in relation to diffusion tensor imaging (DTI), an established model that is largely understood by the neuroimaging community...
December 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27314214/microstructural-maturation-of-white-matter-tracts-in-encephalopathic-neonates
#18
Akash P Kansagra, Marc C Mabray, Donna M Ferriero, A James Barkovich, Duan Xu, Christopher P Hess
PURPOSE: This study aims to apply neurite orientation dispersion and density imaging (NODDI) to measure white matter microstructural features during early development. METHODS: NODDI parameters were measured in twelve newborns and thirteen 6-month infants, all with perinatal clinical encephalopathy. RESULTS: Between 0 and 6 months, there were significant differences in fractional anisotropy (FA) for all tracts; in neurite density for internal capsules, optic radiations, and splenium; and in orientation dispersion for anterior limb of internal capsule and optic radiations...
September 2016: Clinical Imaging
https://www.readbyqxmd.com/read/27214558/neurite-orientation-dispersion-and-density-imaging-color-maps-to-characterize-brain-diffusion-in-neurologic-disorders
#19
Eduardo Caverzasi, Nico Papinutto, Antonella Castellano, Alyssa H Zhu, Paola Scifo, Marco Riva, Lorenzo Bello, Andrea Falini, Aditya Bharatha, Roland G Henry
PURPOSE: Neurite orientation dispersion and density imaging (NODDI) has recently been developed to overcome diffusion technique limitations in modeling biological systems. This manuscript reports a preliminary investigation into the use of a single color-coded map to represent NODDI-derived information. MATERIALS AND METHODS: An optimized diffusion-weighted imaging protocol was acquired in several clinical neurological contexts including demyelinating disease, neoplastic process, stroke, and toxic/metabolic disease...
September 2016: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/27147956/joint-multi-fiber-noddi-parameter-estimation-and-tractography-using-the-unscented-information-filter
#20
Chinthala P Reddy, Yogesh Rathi
Tracing white matter fiber bundles is an integral part of analyzing brain connectivity. An accurate estimate of the underlying tissue parameters is also paramount in several neuroscience applications. In this work, we propose to use a joint fiber model estimation and tractography algorithm that uses the NODDI (neurite orientation dispersion diffusion imaging) model to estimate fiber orientation dispersion consistently and smoothly along the fiber tracts along with estimating the intracellular and extracellular volume fractions from the diffusion signal...
2016: Frontiers in Neuroscience
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