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Functional MRI

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https://www.readbyqxmd.com/read/29245083/concordance-between-the-wada-test-and-neuroimaging-lateralization-influence-of-imaging-modality-fmri-and-meg-and-patient-experience
#1
Steven Kemp, Garreth Prendergast, Theodoros Karapanagiotidis, Gus Baker, Thomas P Kelly, Tufail Patankar, Simon S Keller
The Wada test remains the traditional test for lateralizing language and memory function prior to epilepsy surgery. Functional imaging, particularly functional MRI (fMRI), has made progress in the language domain, but less so in the memory domain. Magnetoencephalography (MEG) has received less research attention, but shows promise, particularly for language lateralization. We recruited a consecutive sample of 19 patients with epilepsy who had completed presurgical work-up, including the Wada test, and compared fMRI (memory) and MEG (language and memory) with Wada test results...
December 12, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29244020/association-between-structural-and-functional-brain-alterations-in-drug-free-patients-with-schizophrenia-a-multimodal-meta-analysis
#2
Xin Gao, Wenjing Zhang, Li Yao, Yuan Xiao, Lu Liu, Jieke Liu, Siyi Li, Bo Tao, Chandan Shah, Qiyong Gong, John A Sweeney, Su Lui
BACKGROUND: Neuroimaging studies have shown both structural and functional abnormalities in patients with schizophrenia. Recently, studies have begun to explore the association between structural and functional grey matter abnormalities. By conducting a meta-analysis on morphometric and functional imaging studies of grey matter alterations in drug-free patients, the present study aims to examine the degree of overlap between brain regions with anatomic and functional changes in patients with schizophrenia...
December 15, 2017: Journal of Psychiatry & Neuroscience: JPN
https://www.readbyqxmd.com/read/29243527/the-neural-correlates-of-negative-symptoms-in-schizophrenia-examples-from-mri-literature
#3
Lynn Mørch-Johnsen, Ingrid Agartz, Jimmy Jensen
Negative symptoms of schizophrenia have a negative impact on psychosocial functioning and disease outcome. It is therefore important to investigate the pathophysiology underlying negative symptoms as this may aid the development of better treatment. In the current article, examples from studies investigating neural correlates of negative symptoms in schizophrenia are given. Investigations using both structural and functional magnetic resonance imaging are presented at different levels of symptomatology descriptions, from the more heterogenous construct of negative symptoms to more single discrete symptoms...
January 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29242958/impact-of-radical-hysterectomy-on-the-transobturator-sling-pathway-a-retrospective-three-dimensional-magnetic-resonance-imaging-study
#4
Jinyang Chen, Chunlin Chen, Yige Li, Lan Chen, Juan Xu, Ping Liu
INTRODUCTION AND HYPOTHESIS: Morphological and functional anomalies of the urethra may cause stress urinary incontinence after radical hysterectomy (RH). We introduce a novel three-dimensional (3D) magnetic resonance imaging (MRI) technique to assess the impact of RH on the transobturator sling pathway. METHODS: 3D-MRI reconstruction models were retrospectively developed for the measurement of various parameters before and after RH, including puncture angle, orientation and distance from the midurethral puncture site to the obturator membrane (DUO), in 31 patients with cervical cancer...
December 14, 2017: International Urogynecology Journal
https://www.readbyqxmd.com/read/29242274/sema4d-plexinb1-inhibition-ameliorates-blood-brain-barrier-damage-and-improves-outcome-after-stroke-in-rats
#5
Yi-Fan Zhou, Ya-Nan Li, Hui-Juan Jin, Jie-Hong Wu, Quan-Wei He, Xu-Xia Wang, Hao Lei, Bo Hu
The inflammatory process in stroke is the major contributor to blood-brain barrier (BBB) breakdown. Previous studies indicated that semaphorin 4D (Sema4D), an axon guidance molecule, initiated inflammatory microglial activation and disrupted endothelial function in the CNS. However, whether Sema4D disrupts BBB integrity after stroke remains unclear. To study the effect of Sema4D on BBB disruption in stroke, rats were subjected to transient middle cerebral artery occlusion and targeted injection of lentivirus-mediated clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9 gene disruption of PlexinB1...
December 14, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29242147/shared-and-divergent-neural-reactivity-to-non-drug-operant-response-outcomes-in-current-smokers-and-ex-smokers
#6
Liam J Nestor, Ella McCabe, Jennifer Jones, Luke Clancy, Hugh Garavan
Addiction to cigarettes presents with considerable health risks and induces high costs on healthcare resources. While the majority of cigarette smokers endorse the desire to quit, only a small percentage of quit attempts lead to full abstinence. Failure to achieve abstinence may arise from maladaptive reactivity in fronto-striatal regions that track positive and negative valence outcomes, thus biasing the choice to smoke in the presence of alternative, non-drug reinforcement. Alternatively, long-term nicotine abstinence may reveal neural substrates of adaptive valence outcome processing that promote and maintain smoking cessation...
December 11, 2017: Brain Research
https://www.readbyqxmd.com/read/29240648/reliable-new-measures-capturing-low-frequency-fluctuations-from-resting-state-functional-mri
#7
Jae-Chang Kim, Sunghyon Kyeong
Resting-state functional MRI (rsfMRI) is one of the most important neuroimaging modalities for investigating alterations in the resting-state networks of the human brain, given that abnormal neural activity during the resting state is associated with neurological disorders. However, neuroimaging results obtained from rsfMRI have rarely been replicated with repeated measurements. Therefore, we aimed to develop new measures to extract highly reliable and reproducible functional neuroimaging metrics from rsfMRI data...
December 13, 2017: Neuroreport
https://www.readbyqxmd.com/read/29239977/increased-resting-state-brain-entropy-in-alzheimer-s-disease
#8
Shao-Wei Xue, Yonghu Guo
Entropy analysis of resting-state functional MRI (R-fMRI) is a novel approach to characterize brain temporal dynamics and facilitates the identification of abnormal brain activity caused by several disease conditions. However, Alzheimer's disease (AD)-related brain entropy mapping based on R-fMRI has not been assessed. Here, we measured the sample entropy and voxel-wise connectivity of the network degree centrality (DC) of the intrinsic brain activity acquired by R-fMRI in 26 patients with AD and 26 healthy controls...
December 12, 2017: Neuroreport
https://www.readbyqxmd.com/read/29238854/effect-of-weight-extremes-on-ventricular-volumes-and-myocardial-strain-in-repaired-tetralogy-of-fallot-as-measured-by-cmr
#9
Scott A Simpson, Suzanne L Field, Meng Xu, Benjamin R Saville, David A Parra, Jonathan H Soslow
Pulmonary valve replacement (PVR) in patients with repaired tetralogy of Fallot (rTOF-TAP) is often based on cardiac MRI (CMR) right ventricular (RV) volumes indexed to body surface area (BSA). Weight extremes result in increased patient morbidity and affect indexed measurements. We hypothesized that patients with rTOF-TAP at extremes of weight have (1) over- or underestimated indexed volumes and (2) altered parameters of cardiac function. CMRs in patients with rTOF-TAP were retrospectively reviewed; analysis included right and left ventricular (LV) volumes and ejection fractions (EF) and peak global LV circumferential strain (ε cc) from myocardial tagged images...
December 14, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/29238678/a-study-of-effect-of-consanguinity-on-cochlear-morphology-in-patients-with-congenital-bilateral-profound-sensorineural-hearing-loss
#10
Y Kavitha, K Sabarigirish, Upendra Kumar Joish, Sanjeev Saxena, Angshuman Dutta
Consanguinity has been considered as one of the risk factors predisposing to the development of congenital hearing loss. Effect of consanguinity on cochlear morphology has been subject of speculation, though many studies have provided insight into functional aspect of cochlea. This study was conducted to know the effect of consanguinity on cochlear morphology, if any. A prospective, observational study, including prelingually deaf children with bilateral profound sensorineural hearing loss who are registered as candidates for cochlear implantation at a tertiary care centre, was conducted...
December 2017: Indian Journal of Otolaryngology and Head and Neck Surgery
https://www.readbyqxmd.com/read/29238512/an-approach-to-developing-customized-total-knee-replacement-implants
#11
Xinyu Li, Changjiang Wang, Yuan Guo, Weiyi Chen
Total knee replacement (TKR) has been performed for patients with end-stage knee joint arthritis to relieve pain and gain functions. Most knee replacement patients can gain satisfactory knee functions; however, the range of motion of the implanted knee is variable. There are many designs of TKR implants; it has been suggested by some researchers that customized implants could offer a better option for patients. Currently, the 3-dimensional knee model of a patient can be created from magnetic resonance imaging (MRI) or computed tomography (CT) data using image processing techniques...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29237797/endothelial-progenitor-cells-enhance-blood-brain-barrier-permeability-in-subacute-stroke
#12
João Sargento-Freitas, Sezin Aday, César Nunes, Miguel Cordeiro, Ana Gouveia, Fernando Silva, Cristina Machado, Bruno Rodrigues, Gustavo Cordeiro Santo, Carlos Ferreira, André Amorim, Susana Sousa, Ana Catarina Gomes, Miguel Castelo-Branco, Lino Ferreira, Luís Cunha
OBJECTIVE: To study the association among endothelial progenitor cells (EPCs), subacute blood-brain barrier (BBB) permeability, and clinical outcome after ischemic stroke, determining the micro RNAs of EPCs responsible for good clinical outcome. METHODS: We included consecutive patients with nonlacunar acute ischemic strokes in the territory of a middle cerebral artery and ages between 18 and 80 years. Clinical outcome was defined as modified Rankin Scale score at 3 months...
December 13, 2017: Neurology
https://www.readbyqxmd.com/read/29237665/intermittent-catatonia-and-complex-automatisms-caused-by-frontal-lobe-epilepsy-in-dementia
#13
Robynne George, Alex Langford
An 82-year-old man was admitted to the emergency department following bizarre behaviour. Police had noticed him driving erratically through his village. He did not stop when instructed, drove slowly home and appeared 'vacant' on questioning. While in hospital, he had approximately 15 episodes of catatonia, involving rigidity, negativism, mutism except echolalia and perseveration, automatic obedience and utilisation phenomena, lasting 2-20 min each. Between episodes, he was amnestic but otherwise well. Electroencephalography demonstrated bifrontal slowing with left-sided emphasis, and captured two focal onset partial seizures with the clinical correlate of the syndrome described above...
December 13, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/29237455/molecular-and-histological-effects-of-mr-guided-pulsed-focused-ultrasound-to-the-rat-heart
#14
Kee W Jang, Tsang-Wei Tu, Matthew E Nagle, Bobbi K Lewis, Scott R Burks, Joseph A Frank
BACKGROUND: Image-guided high intensity focused ultrasound has been used as an extracorporeal cardiac pacing tool and to enhance homing of stem cells to targeted tissues. However, molecular changes in the myocardium after sonication have not been widely investigated. Magnetic-resonance (MR)-guided pulsed focused ultrasound (pFUS) was targeted to the rat myocardium over a range of pressures and the microenvironmental and histological effects were evaluated over time. METHODS: Eight-to-ten-week-old Sprague-Dawley rats received T2-weighted MR images to target pFUS to the left ventricular and septum without cardiac or respiratory gating...
December 13, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/29237450/adding-chinese-herbal-medicine-to-conventional-therapy-brings-cognitive-benefits-to-patients-with-alzheimer-s-disease-a-retrospective-analysis
#15
Jing Shi, Jingnian Ni, Tao Lu, Xuekai Zhang, Mingqing Wei, Ting Li, Weiwei Liu, Yongyan Wang, Yuanyuan Shi, Jinzhou Tian
BACKGROUND: Conventional therapy (CT) such as donepezil and memantine are well-known short-term treatments for the symptoms of Alzheimer's disease (AD). The efficacy of them, however, drops below baseline level after 9 months. In China, herbal therapy as a complementary therapy is very popular. Should conventional therapy combined with herbal therapy (CT + H) make add-on benefit? METHODS: In this retrospective cohort study, 344 outpatients diagnosed as probable dementia due to AD were collected, with the treatment of either CT + H or CT alone in clinical settings...
December 13, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/29236647/assessing-the-marks-of-change-how-psychotherapy-alters-the-brain-structure-in-women-with-borderline-personality-disorder
#16
Falk Mancke, Ruth Schmitt, Dorina Winter, Inga Niedtfeld, Sabine C Herpertz, Christian Schmahl
BACKGROUND: There is increasing evidence that psychotherapy can alter the function of the brain of patients with borderline personality disorder (BPD). However, it is not known whether psychotherapy can also modify the brain structure of patients with BPD. METHODS: We used structural MRI data of female patients with BPD before and after participation in 12 weeks of residential dialectical behavioural therapy (DBT) and compared them to data from female patients with BPD who received treatment as usual (TAU)...
December 13, 2017: Journal of Psychiatry & Neuroscience: JPN
https://www.readbyqxmd.com/read/29236600/benefit-of-intraoperative-neurophysiological-monitoring-in-a-pediatric-patient-with-spinal-dysmorphism-split-cord-malformation-and-scoliosis
#17
Faisal R Jahangiri, Samir Al Sayegh, Moutasem Azzubi, Abdulrahman M Alrajhi, Monerah M Annaim, Shmoukh A Al Sharif, Tanweer Aziz, Sami Al Eissa
Intraoperative neurophysiological monitoring (IONM) consists of a group of neurodiagnostic techniques that assess the nervous system's functional integrity during surgical operations. A retrospective analysis of a pediatric female patient was conducted who underwent 12 operations for the correction of scoliosis, tethered cord, and split spinal cord wherein IONM played an important role. From age 3 to 6, she underwent six procedures including a release of the tethered cord, resection of the filum terminale, removal of a T11-T12 bony spur, release of L3 adhesions, repair of subcutaneous meningocele, and correction of scoliosis with a vertical expandable prosthetic titanium rod (VEPTR) technique without the use of IONM...
2017: Neurodiagnostic Journal
https://www.readbyqxmd.com/read/29234935/cardiac-and-respiratory-gated-volumetric-murine-ultrasound
#18
Arvin H Soepriatna, Frederick W Damen, Pavlos P Vlachos, Craig J Goergen
Current cardiovascular ultrasound mainly employs planar imaging techniques to assess function and physiology. These techniques rely on geometric assumptions, which are dependent on the imaging plane, susceptible to inter-observer variability, and may be inaccurate when studying complex diseases. Here, we developed a gated volumetric murine ultrasound technique to visualize cardiovascular motion with high spatiotemporal resolution and directly evaluate cardiovascular health. Cardiac and respiratory-gated cine loops, acquired at 1000 frames-per-second from sequential positions, were temporally registered to generate a four-dimensional (4D) dataset...
December 12, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/29234600/prediction-of-cognitive-and-motor-development-in-preterm-children-using-exhaustive-feature-selection-and-cross-validation-of-near-term-white-matter-microstructure
#19
Kornél Schadl, Rachel Vassar, Katelyn Cahill-Rowley, Kristin W Yeom, David K Stevenson, Jessica Rose
Background: Advanced neuroimaging and computational methods offer opportunities for more accurate prognosis. We hypothesized that near-term regional white matter (WM) microstructure, assessed on diffusion tensor imaging (DTI), using exhaustive feature selection with cross-validation would predict neurodevelopment in preterm children. Methods: Near-term MRI and DTI obtained at 36.6 ± 1.8 weeks postmenstrual age in 66 very-low-birth-weight preterm neonates were assessed...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29234599/selecting-the-most-relevant-brain-regions-to-discriminate-alzheimer-s-disease-patients-from-healthy-controls-using-multiple-kernel-learning-a-comparison-across-functional-and-structural-imaging-modalities-and-atlases
#20
Jane Maryam Rondina, Luiz Kobuti Ferreira, Fabio Luis de Souza Duran, Rodrigo Kubo, Carla Rachel Ono, Claudia Costa Leite, Jerusa Smid, Ricardo Nitrini, Carlos Alberto Buchpiguel, Geraldo F Busatto
Background: Machine learning techniques such as support vector machine (SVM) have been applied recently in order to accurately classify individuals with neuropsychiatric disorders such as Alzheimer's disease (AD) based on neuroimaging data. However, the multivariate nature of the SVM approach often precludes the identification of the brain regions that contribute most to classification accuracy. Multiple kernel learning (MKL) is a sparse machine learning method that allows the identification of the most relevant sources for the classification...
2018: NeuroImage: Clinical
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