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https://www.readbyqxmd.com/read/28638316/a-new-generation-of-brain-computer-interfaces-driven-by-discovery-of-latent-eeg-fmri-linkages-using-tensor-decomposition
#1
Gopikrishna Deshpande, D Rangaprakash, Luke Oeding, Andrzej Cichocki, Xiaoping P Hu
A Brain-Computer Interface (BCI) is a setup permitting the control of external devices by decoding brain activity. Electroencephalography (EEG) has been extensively used for decoding brain activity since it is non-invasive, cheap, portable, and has high temporal resolution to allow real-time operation. Due to its poor spatial specificity, BCIs based on EEG can require extensive training and multiple trials to decode brain activity (consequently slowing down the operation of the BCI). On the other hand, BCIs based on functional magnetic resonance imaging (fMRI) are more accurate owing to its superior spatial resolution and sensitivity to underlying neuronal processes which are functionally localized...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28634624/population-averaged-macaque-brain-atlas-with-high-resolution-ex-vivo-dti-integrated-into-in-vivo-space
#2
Lei Feng, Tina Jeon, Qiaowen Yu, Minhui Ouyang, Qinmu Peng, Virendra Mishra, Mihovil Pletikos, Nenad Sestan, Michael I Miller, Susumu Mori, Steven Hsiao, Shuwei Liu, Hao Huang
Animal models of the rhesus macaque (Macaca mulatta), the most widely used nonhuman primate, have been irreplaceable in neurobiological studies. However, a population-averaged macaque brain diffusion tensor imaging (DTI) atlas, including comprehensive gray and white matter labeling as well as bony and facial landmarks guiding invasive experimental procedures, is not available. The macaque white matter tract pathways and microstructures have been rarely recorded. Here, we established a population-averaged macaque brain atlas with high-resolution ex vivo DTI integrated into in vivo space incorporating bony and facial landmarks, and delineated microstructures and three-dimensional pathways of major white matter tracts in vivo MRI/DTI and ex vivo (postmortem) DTI of ten rhesus macaque brains were acquired...
June 20, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28617996/gradient-nonlinearity-effects-on-upper-cervical-spinal-cord-area-measurement-from-3d-t1-weighted-brain-mri-acquisitions
#3
Nico Papinutto, Rohit Bakshi, Antje Bischof, Peter A Calabresi, Eduardo Caverzasi, R Todd Constable, Esha Datta, Gina Kirkish, Govind Nair, Jiwon Oh, Daniel Pelletier, Dzung L Pham, Daniel S Reich, William Rooney, Snehashis Roy, Daniel Schwartz, Russell T Shinohara, Nancy L Sicotte, William A Stern, Ian Tagge, Shahamat Tauhid, Subhash Tummala, Roland G Henry
PURPOSE: To explore (i) the variability of upper cervical cord area (UCCA) measurements from volumetric brain 3D T1 -weighted scans related to gradient nonlinearity (GNL) and subject positioning; (ii) the effect of vendor-implemented GNL corrections; and (iii) easily applicable methods that can be used to retrospectively correct data. METHODS: A multiple sclerosis patient was scanned at seven sites using 3T MRI scanners with the same 3D T1 -weighted protocol without GNL-distortion correction...
June 15, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28609110/monitoring-tumor-volume-in-patients-with-prostate-cancer-undergoing-active-surveillance-is-mri-apparent-diffusion-coefficient-indicative-of-tumor-growth
#4
Veronica A Morgan, Christopher Parker, Alison MacDonald, Karen Thomas, Nandita M deSouza
OBJECTIVE: The purpose of this study was to measure longitudinal change in tumor volume of the dominant intraprostatic lesion and determine whether baseline apparent diffusion coefficient (ADC) and change in ADC are indicative of tumor growth in patients with prostate cancer undergoing active surveillance. SUBJECTS AND METHODS: The study group included 151 men (mean age, 68.1 ± 7.4 [SD] years; range, 50-83 years) undergoing active surveillance with 3D whole prostate, zonal, and tumor volumetric findings documented at endorectal MRI examinations performed at two time points (median interval, 1...
June 13, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28588732/trus-guided-transperineal-prostate-12-x-core-biopsy-with-template-for-the-diagnosis-of-prostate-cancer
#5
Gang Guo, Yong Xu, Xu Zhang
The objective of the present study was to explore the clinical value and safety of trans-rectal ultrasound (TRUS)-guided transperineal prostate 12+X core biopsy in the diagnosis of prostate cancer. Patients who received a TRUS-guided transperineal prostate biopsy for suspected prostate cancer at the General Hospital of The People's Liberation Army between September 2009 and May 2014 were retrospectively analyzed, this consisted of 1,300 patients. These patients were randomly divided into the 12+X core group or the standard 12-core group...
June 2017: Oncology Letters
https://www.readbyqxmd.com/read/28588345/neuroanatomic-variations-in-graves-dysthyroid-ophthalmopathy-as-studied-with-mri
#6
Rona Z Silkiss, Alex R Wade
PURPOSE: To evaluate whether patients with Graves' dysthyroid ophthalmopathy (GDO) have changes in brain anatomy that can be assessed by neuroimaging as compared to age-matched controls. METHODS: We examined 10 female, euthyroid patients with GDO and 14 age and gender matched controls using high-resolution structural MRI scanning. An automatic cortical segmentation algorithm was used to estimate the thickness of each subject's gray matter across the brain. The resulting cortical thickness measurements were transferred to a standard reference space via a template-based warping procedure...
August 2016: Transactions of the American Ophthalmological Society
https://www.readbyqxmd.com/read/28582450/spontaneous-low-frequency-bold-signal-variations-from-resting-state-fmri-are-decreased-in-alzheimer-disease
#7
Samaneh Kazemifar, Kathryn Y Manning, Nagalingam Rajakumar, Francisco A Gómez, Andrea Soddu, Michael J Borrie, Ravi S Menon, Robert Bartha
Previous studies have demonstrated altered brain activity in Alzheimer's disease using task based functional MRI (fMRI), network based resting-state fMRI, and glucose metabolism from 18F fluorodeoxyglucose-PET (FDG-PET). Our goal was to define a novel indicator of neuronal activity based on a first-order textural feature of the resting state functional MRI (RS-fMRI) signal. Furthermore, we examined the association between this neuronal activity metric and glucose metabolism from 18F FDG-PET. We studied 15 normal elderly controls (NEC) and 15 probable Alzheimer disease (AD) subjects from the AD Neuroimaging Initiative...
2017: PloS One
https://www.readbyqxmd.com/read/28574344/a-framework-for-the-generation-of-realistic-synthetic-cardiac-ultrasound-and-magnetic-resonance-imaging-sequences-from-the-same-virtual-patients
#8
Yitian Zhou, Sophie Giffard-Roisin, Mathieu De Craene, Sorina Camarasu-Pop, Jan D'hooge, Martino Alessandrini, Denis Friboulet, Maxime Sermesant, Olivier Bernard
The use of synthetic sequences is one of the most promising tools for advanced in silico evaluation of the quantification of cardiac deformation and strain through 3D ultrasound (US) and magnetic resonance (MR) imaging. In this paper, we propose the first simulation framework which allows the generation of realistic 3D synthetic cardiac US and MR (both cine and tagging) image sequences from the same virtual patient. A state-of-the-art electromechanical (E/M) model was exploited for simulating groundtruth cardiac motion fields ranging from healthy to various pathological cases including both ventricular dyssynchrony and myocardial ischemia...
May 25, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28572765/white-matter-structural-connectivity-is-not-correlated-to-cortical-resting-state-functional-connectivity-over-the-healthy-adult-lifespan
#9
Adrian Tsang, Catherine A Lebel, Signe L Bray, Bradley G Goodyear, Moiz Hafeez, Roberto C Sotero, Cheryl R McCreary, Richard Frayne
Structural connectivity (SC) of white matter (WM) and functional connectivity (FC) of cortical regions undergo changes in normal aging. As WM tracts form the underlying anatomical architecture that connects regions within resting state networks (RSNs), it is intuitive to expect that SC and FC changes with age are correlated. Studies that investigated the relationship between SC and FC in normal aging are rare, and have mainly compared between groups of elderly and younger subjects. The objectives of this work were to investigate linear SC and FC changes across the healthy adult lifespan, and to define relationships between SC and FC measures within seven whole-brain large scale RSNs...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28559791/photogrammetry-based-head-digitization-for-rapid-and-accurate-localization-of-eeg-electrodes-and-meg-fiducial-markers-using-a-single-digital-slr-camera
#10
Tommy Clausner, Sarang S Dalal, Maité Crespo-García
The performance of EEG source reconstruction has benefited from the increasing use of advanced head modeling techniques that take advantage of MRI together with the precise positions of the recording electrodes. The prevailing technique for registering EEG electrode coordinates involves electromagnetic digitization. However, the procedure adds several minutes to experiment preparation and typical digitizers may not be accurate enough for optimal source reconstruction performance (Dalal et al., 2014). Here, we present a rapid, accurate, and cost-effective alternative method to register EEG electrode positions, using a single digital SLR camera, photogrammetry software, and computer vision techniques implemented in our open-source toolbox, janus3D...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28538516/left-lateralization-of-resting-state-functional-connectivity-between-the-presupplementary-motor-area-and-primary-language-areas
#11
William Lou, Kyung K Peck, Nicole Brennan, Arka Mallela, Andrei Holodny
An abundance of evidence points to the role of a presupplementary motor area (pre-SMA) in human language. This study explores the pre-SMA resting state connectivity network and the nature of its connections to known language areas. We tested the hypothesis that by seeding the pre-SMA, one would be able to establish language laterality to known cortical and subcortical language areas. We analyzed data from 30 right-handed healthy controls and performed the resting state functional MRI. A seed-based analysis using a manually drawn pre-SMA region of interest template was applied...
July 5, 2017: Neuroreport
https://www.readbyqxmd.com/read/28536045/toward-defining-deep-brain-stimulation-targets-in-mni-space-a-subcortical-atlas-based-on-multimodal-mri-histology-and-structural-connectivity
#12
REVIEW
Siobhan Ewert, Philip Plettig, Ningfei Li, M Mallar Chakravarty, D Louis Collins, Todd M Herrington, Andrea A Kühn, Andreas Horn
Three-dimensional atlases of subcortical brain structures are valuable tools to reference anatomy in neuroscience and neurology. For instance, they can be used to study the position and shape of the three most common deep brain stimulation (DBS) targets, the subthalamic nucleus (STN), internal part of the pallidum (GPi) and ventral intermediate nucleus of the thalamus (VIM) in spatial relationship to DBS electrodes. Here, we present a composite atlas based on manual segmentations of a multimodal high resolution brain template, histology and structural connectivity...
May 20, 2017: NeuroImage
https://www.readbyqxmd.com/read/28491942/a-dataset-of-multi-contrast-population-averaged-brain-mri-atlases-of-a-parkinson-s-disease-cohort
#13
Yiming Xiao, Vladimir Fonov, M Mallar Chakravarty, Silvain Beriault, Fahd Al Subaie, Abbas Sadikot, G Bruce Pike, Gilles Bertrand, D Louis Collins
Parkinson׳s disease (PD) is a neurodegenerative disease that primarily affects the motor functions of the patients. Research and surgical treatment of PD (e.g., deep brain stimulation) often require human brain atlases for structural identification or as references for anatomical normalization. However, two pitfalls exist for many current atlases used for PD. First, most atlases do not represent the disease-specific anatomy as they are based on healthy young subjects. Second, subcortical structures, such as the subthalamic nucleus (STN) used in deep brain stimulation procedures, are often not well visualized...
June 2017: Data in Brief
https://www.readbyqxmd.com/read/28487460/functional-lesional-neurosurgery-for-tremor-a-protocol-for-a-systematic-review-and-meta-analysis
#14
Sebastian R Schreglmann, Joachim K Krauss, Jin Woo Chang, Kailash P Bhatia, Georg Kaegi
INTRODUCTION: The recent introduction of incision-less lesional neurosurgery using Gamma Knife and MRI-guided focused ultrasound has revived interest in lesional treatment options for tremor disorders. Preliminary literature researches reveal that the consistency of treatment effects after lesional neurosurgery for tremor has not formally been assessed yet. Similarly, the efficacy of different targets for lesional treatment and incidence of persistent side effects of lesional neurosurgical interventions has not been comprehensively assessed...
May 9, 2017: BMJ Open
https://www.readbyqxmd.com/read/28483546/impact-of-a-structured-report-template-on-the-quality-of-ct-and-mri-reports-for-hepatocellular-carcinoma-diagnosis
#15
Milana Flusberg, Jeremy Ganeles, Tulay Ekinci, Shlomit Goldberg-Stein, Viktoriya Paroder, Mariya Kobi, Victoria Chernyak
PURPOSE: To assess the impact of a Liver Imaging Reporting and Data System (LI-RADS) structured template on quality of reports for hepatocellular carcinoma (HCC). MATERIALS AND METHODS: A departmental structured LI-RADS template was adopted in April 2015. CT and MRI reports from September 2014 to February 2016 with probable or definite HCC were reviewed. Reporting of the following was recorded for each lesion and compared between template and free-text reports: (1) LI-RADS category, (2) Couinaud segment, and (3) unequivocal description of presence or absence of major LI-RADS HCC features: arterial phase hyperenhancement, "washout," diameter, threshold growth, and "capsule...
May 5, 2017: Journal of the American College of Radiology: JACR
https://www.readbyqxmd.com/read/28476663/a-probabilistic-template-of-human-mesopontine-tegmental-nuclei-from-in-vivo-7-t-mri
#16
REVIEW
Marta Bianciardi, Christian Strong, Nicola Toschi, Brian L Edlow, Bruce Fischl, Emery N Brown, Bruce R Rosen, Lawrence L Wald
Mesopontine tegmental nuclei such as the cuneiform, pedunculotegmental, oral pontine reticular, paramedian raphe and caudal linear raphe nuclei, are deep brain structures involved in arousal and motor function. Dysfunction of these nuclei is implicated in the pathogenesis of disorders of consciousness and sleep, as well as in neurodegenerative diseases. However, their localization in conventional neuroimages of living humans is difficult due to limited image sensitivity and contrast, and a stereotaxic probabilistic neuroimaging template of these nuclei in humans does not exist...
May 2, 2017: NeuroImage
https://www.readbyqxmd.com/read/28461058/a-population-mri-brain-template-and-analysis-tools-for-the-macaque
#17
REVIEW
Jakob Seidlitz, Caleb Sponheim, Daniel Glen, Frank Q Ye, Kadharbatcha S Saleem, David A Leopold, Leslie Ungerleider, Adam Messinger
The use of standard anatomical templates is common in human neuroimaging, as it facilitates data analysis and comparison across subjects and studies. For non-human primates, previous in vivo templates have lacked sufficient contrast to reliably validate known anatomical brain regions and have not provided tools for automated single-subject processing. Here we present the "National Institute of Mental Health Macaque Template", or NMT for short. The NMT is a high-resolution in vivo MRI template of the average macaque brain generated from 31 subjects, as well as a neuroimaging tool for improved data analysis and visualization...
April 28, 2017: NeuroImage
https://www.readbyqxmd.com/read/28436842/a-hybrid-image-registration-and-matching-framework-for-real-time-motion-tracking-in-mri-guided-radiotherapy
#18
Matteo Seregni, Chiara Paganelli, Paul Summers, Massimo Bellomi, Guido Baroni, Marco Riboldi
OBJECTIVE: MRI-guided radiotherapy (MRIgRT) is an emerging treatment technique where anatomical and pathological structures are imaged through integrated MR-radiotherapy units. This work aims (i) at assessing the accuracy of optical-flow based motion tracking in liver cine-MRI sequences and (ii) at testing a MRIgRT workflow combining similarity-based image matching with image registration. METHODS: After an initialization stage, a set of template images is collected and registered to the first frame of the cine-MRI sequence...
April 24, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28425431/characterization-of-spatial-distortion-in-a-0-35-t-mri-guided-radiotherapy-system
#19
John S Ginn, Nzhde Agazaryan, Minsong Cao, Umar Baharom, Daniel A Low, Yingli Yang, Yu Gao, Peng Hu, Percy Lee, James M Lamb
Spatial distortion results in image deformation that can degrade accurate targeting and dose calculations in MRI-guided adaptive radiotherapy. The authors present a comprehensive assessment of a 0.35 T MRI-guided radiotherapy system's spatial distortion using two commercially-available phantoms with regularly spaced markers. Images of the spatial integrity phantoms were acquired using five clinical protocols on the MRI-guided radiotherapy machine with the radiotherapy gantry positioned at various angles. Software was developed to identify and localize all phantom markers using a template matching approach...
April 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28413234/high-dimensional-tests-for-functional-networks-of-brain-anatomic-regions
#20
Jichun Xie, Jian Kang
Exploring resting-state brain functional connectivity of autism spectrum disorders (ASD) using functional magnetic resonance imaging (fMRI) data has become a popular topic over the past few years. The data in a standard brain template consist of over 170,000 voxel specific points in time for each human subject. Such an ultra-high dimensionality makes the voxel-level functional connectivity analysis (involving four billion voxel pairs) both statistically and computationally inefficient. In this work, we introduce a new framework to identify the functional brain network at the anatomical region level for each individual...
April 2017: Journal of Multivariate Analysis
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