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https://www.readbyqxmd.com/read/28550818/blochsolver-a-gpu-optimized-fast-3d-mri-simulator-for-experimentally-compatible-pulse-sequences
#1
Ryoichi Kose, Katsumi Kose
A magnetic resonance imaging (MRI) simulator, which reproduces MRI experiments using computers, has been developed using two graphic-processor-unit (GPU) boards (GTX 1080). The MRI simulator was developed to run according to pulse sequences used in experiments. Experiments and simulations were performed to demonstrate the usefulness of the MRI simulator for three types of pulse sequences, namely, three-dimensional (3D) gradient-echo, 3D radio-frequency spoiled gradient-echo, and gradient-echo multislice with practical matrix sizes...
May 20, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28550762/forensic-age-estimation-by-morphometric-analysis-of-the-manubrium-from-3d-mr-images
#2
Naira P Martínez Vera, Johannes Höller, Thomas Widek, Bernhard Neumayer, Thomas Ehammer, Martin Urschler
Forensic age estimation research based on skeletal structures focuses on patterns of growth and development using different bones. In this work, our aim was to study growth-related evolution of the manubrium in living adolescents and young adults using magnetic resonance imaging (MRI), which is an image acquisition modality that does not involve ionizing radiation. In a first step, individual manubrium and subject features were correlated with age, which confirmed a statistically significant change of manubrium volume (Mvol:p<0...
May 12, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28550719/morphometric-analysis-of-thalamic-volume-in-progressive-supranuclear-palsy-in-vivo-evidence-of-regionally-specific-bilateral-thalamic-atrophy
#3
Brian D Power, David Jakabek, Mitchell Hunter-Dickson, Fiona A Wilkes, Danielle van Westen, Alexander F Santillo, Mark Walterfang, Dennis Velakoulis, Christer Nilsson, Jeffrey C L Looi
We investigated whether differences were detectable in the volume and shape of the dorsal thalamus on magnetic resonance imaging in patients with progressive supranuclear palsy (PSP). Manual segmentation of the left and right thalami on magnetic resonance imaging scans occurred in 22 patients with clinically diagnosed PSP and 23 healthy controls; thalamic volumes (left, right, total) were calculated. Between group differences were explored by multivariate analysis of co-variance, using age and intracranial volume as covariates...
May 17, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28550499/systematic-review-of-fmri-compatible-devices-design-and-testing-criteria
#4
REVIEW
V Hartwig, N Carbonaro, A Tognetti, N Vanello
Functional Magnetic Resonance Imaging (fMRI) is at present one of the most used methodologies for functional brain exploration, both in clinical and research settings. fMRI can noninvasively measure neural activity by using specific experimental paradigms. Often, these paradigms require the stimulation of the subject to perform sensorimotor tasks: in the past, the stimuli have been administered manually for investigating fundamental aspects of tactile perception and somatosensory processing. Nowadays, the use of mechatronic devices to stimulate the subject during fMRI studies is growing, also to assure reproducibility, control, and monitoring of task performances...
May 26, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28550488/the-value-of-preoperative-positron-emission-tomography-computed-tomography-in-node-negative-endometrial-cancer-on-magnetic-resonance-imaging
#5
Jeong-Yeol Park, Jong Jin Lee, Hyuck Jae Choi, In Hye Song, Chang Ohk Sung, Hye Ok Kim, Sun-Young Chae, Young-Tak Kim, Joo-Hyun Nam
OBJECTIVE: The aim of this study was to investigate the value of [18F]fluorodeoxyglucose-positron emission tomography/computed tomography (FDG-PET/CT) in predicting lymph node status in node-negative endometrial cancer on preoperative magnetic resonance imaging (MRI). METHODS: Patients with endometrial cancer who underwent both preoperative MRI and FDG-PET/CT followed by hysterectomy and lymphadenectomy were initially included. We then enrolled patients with MRI-defined node-negative disease (lymph nodes <1 cm in the short-axis diameter, or no visible lymph node)...
May 26, 2017: Annals of Surgical Oncology
https://www.readbyqxmd.com/read/28550393/interval-magnetic-resonance-imaging-an-alternative-to-guidelines-for-indeterminate-nodules-discovered-in-the-cirrhotic-liver
#6
Eliza W Beal, Joseph F Kearney, Jeffery M Chakedis, A James Hanje, Lanla F Conteh, Sylvester M Black, Kenneth Washburn, Kristin M Dittmar, Timothy M Pawlik, Mary R Dillhoff, Carl R Schmidt
BACKGROUND: Current guidelines for the management of indeterminate nodules discovered on surveillance imaging recommend alternate imaging modality or biopsy. This study evaluates the use of short interval MRI rather than immediate CT or biopsy. METHOD: This retrospective cohort study examines outcomes of 111 patients with indeterminate nodules reviewed by a single institution's Liver Tumor Board 2011-2016. Analysis was focused on outcomes stratified by management decision...
May 26, 2017: Journal of Gastrointestinal Surgery: Official Journal of the Society for Surgery of the Alimentary Tract
https://www.readbyqxmd.com/read/28550357/apparent-diffusion-coefficient-in-differentiation-of-pediatric-posterior-fossa-tumors
#7
Soubhi Zitouni, Gonca Koc, Selim Doganay, Sibel Saracoglu, Kazim Z Gumus, Saliha Ciraci, Abdulhakim Coskun, Ekrem Unal, Huseyin Per, Ali Kurtsoy, Olgun Kontas
PURPOSE: To investigate the contribution of preoperative apparent diffusion coefficient (ADC) values in the differential diagnosis of pediatric posterior fossa tumors. METHODS: Forty-two pediatric patients (mean age 7.76 ± 4.58 years) with intra-axial tumors in the infra-tentorial region underwent magnetic resonance imaging. ADC measurement was performed using regions of interest, obtained from the solid component of the mass lesions. ADC ratios were calculated by dividing the ADC values from the mass lesions by the ADC values from normal cerebellar parenchyma...
May 26, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28550313/quantification-of-hepatocellular-carcinoma-heterogeneity-with-multiparametric-magnetic-resonance-imaging
#8
Stefanie J Hectors, Mathilde Wagner, Octavia Bane, Cecilia Besa, Sara Lewis, Romain Remark, Nelson Chen, M Isabel Fiel, Hongfa Zhu, Sacha Gnjatic, Miriam Merad, Yujin Hoshida, Bachir Taouli
Tumour heterogeneity poses a significant challenge for treatment stratification. The goals of this study were to quantify heterogeneity in hepatocellular carcinoma (HCC) using multiparametric magnetic resonance imaging (mpMRI), and to report preliminary data correlating quantitative MRI parameters with advanced histopathology and gene expression in a patient subset. Thirty-two HCC patients with 39 HCC lesions underwent mpMRI including diffusion-weighted imaging (DWI), blood-oxygenation-level-dependent (BOLD), tissue-oxygenation-level-dependent (TOLD) and dynamic contrast-enhanced (DCE)-MRI...
May 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28550264/depressive-symptoms-are-associated-with-progression-to-dementia-in-patients-with-amyloid-positive-mild-cognitive-impairment
#9
Byungseung Moon, Seongheon Kim, Young Ho Park, Jae-Sung Lim, Young Chul Youn, Sang Yun Kim, Jae-Won Jang
BACKGROUND: Depressive symptoms are prevalent in patients with mild cognitive impairment (MCI) and are considered to be a risk factor for progression to dementia. OBJECTIVE: The purpose of this study was to evaluate whether depressive symptoms in MCI promote disease progression in a manner related to amyloid status, and to determine the relationship between depressive symptoms and longitudinal cerebral structural changes. METHODS: Baseline data for 336 patients with MCI (75 with depression and 261 without) from the Alzheimer's Disease Neuroimaging Initiative study were analyzed...
May 26, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28550260/living-alone-with-alzheimer-s-disease-data-from-svedem-the-swedish-dementia-registry
#10
Pavla Cermakova, Maja Nelson, Juraj Secnik, Sara Garcia-Ptacek, Kristina Johnell, Johan Fastbom, Lena Kilander, Bengt Winblad, Maria Eriksdotter, Dorota Religa
BACKGROUND: Many people with Alzheimer's disease (AD) live alone in their own homes. There is a lack of knowledge about whether these individuals receive the same quality of diagnostics and treatment for AD as patients who are cohabiting. OBJECTIVES: To investigate the diagnostic work-up and treatment of community-dwelling AD patients who live alone. METHODS: We performed a cross-sectional cohort study based on data from the Swedish Dementia Registry (SveDem)...
May 25, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28550257/increasing-body-mass-index-at-midlife-is-associated-with-increased-cortical-thinning-in-alzheimer-s-disease-vulnerable-regions
#11
Marnie E Shaw, Walter P Abhayaratna, Kaarin J Anstey, Nicolas Cherbuin
Higher body mass index (BMI) at midlife is associated with greater decreases in cognitive function at older age as well as increased Alzheimer's disease (AD) risk, compared to those with normal BMI. Here, we tested whether BMI at midlife was associated with cortical thinning in brain regions known to be affected in early AD. We examined a large sample (n = 404) of midlife individuals (44-49 years) from the PATH population-based study. Individuals were scanned with magnetic resonance imaging (1.5T) on up to three occasions over eight years...
May 26, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28550250/frequency-dependent-changes-in%C3%A2-the%C3%A2-amplitude-of-low-frequency-fluctuations-in-mild-cognitive-impairment-with-mild-depression
#12
Yuxia Li, Bin Jing, Han Liu, Yifan Li, Xuan Gao, Yongqiu Li, Bin Mu, Haikuo Yu, Jinbo Cheng, Peter B Barker, Hongxing Wang, Ying Han
BACKGROUND: Depression is a potential marker of preclinical Alzheimer's disease (AD). However, little is known about the abnormal characteristics revealed by resting-state functional magnetic resonance imaging (rs-fMRI) in mild cognitive impairment (MCI) subjects with depressive symptoms (MCI-d). OBJECTIVE: The study was to examine whether abnormalities in amplitudes of low-frequency oscillation occurred in MCI-d and tried to find the possible spectrum showed higher recognition ability to the diagnosis by utilizing functional MRI (fMRI)...
May 26, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28549955/a-peculiar-case-of-type-1-endoleak-after-nellix-endovascular-aneurysm-sac-sealing-clinical-presentation-and-management
#13
O Martinelli, L Irace, R Gattuso, C Belli, M Fresilli, B Gossetti
We report one case of type 1 endoleak (EL) with an outflow via a lumbar artery following Nellix endovascular aneurysm sealing (EVAS) in order to discuss the specific peculiarities and management of this complication. A 64-year-old man ( ASA 3) underwent Nellix EVAS for an asymptomatic infra-renal aortic aneurysm. The 6-month Duplex scanning ultrasound and magnetic resonance imaging showed a type IA endoleak with an outflow via a lumbar artery (LA) combined with a stable aneurysmal sac size. The subsequent 9-month imaging controls showed no changes of the endoleak cavity but there was a slight enlargement in proximal neck size associated with the distal migration of both Nellix grafts...
May 23, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28549951/disappearance-of-globus-pallidum-lesions-in-t1-weighted-magnetic-resonance-images-after-ligation-of-congenital-portosystemic-venous-shunt
#14
Ryuichi Takemoto, Kenichiro Yamamura, Hazumu Nagata, Naoki Kawaguchi, Yasunari Sakai, Toshiharu Matsuura, Tomoaki Taguchi, Shouichi Ohga
No abstract text is available yet for this article.
May 10, 2017: Pediatrics and Neonatology
https://www.readbyqxmd.com/read/28549943/do-heat-and-moisture-exchangers-in-the-anaesthesia-breathing-circuit-preserve-body-temperature-in-dogs-undergoing-anaesthesia-for-magnetic-resonance-imaging
#15
Latifa Khenissi, Gwen Covey-Crump, Toby G Knowles, Joanna Murrell
OBJECTIVE: To investigate whether the use of a heat and moisture exchanger (HME) preserves body temperature in dogs weighing <10 kg anaesthetised for magnetic resonance imaging (MRI). STUDY DESIGN: Prospective, randomised, clinical trial. ANIMALS: Thirty-one client-owned dogs. METHODS: Dogs were assigned randomly to a treatment group [HME (n = 16) or no HME (n = 15)]. Dogs were pseudorandomised according to the premedication they were administered, either dexmedetomidine or no dexmedetomidine...
March 6, 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/28549915/isolated-hypoglossal-paralysis-caused-by-ischemic-infarction-in-the-centrum-semiovale
#16
Takuya Fukuoka, Yoshihiko Nakazato, Naotoshi Tamura, Nobuo Araki, Toshimasa Yamamoto
In the present report, we discuss the case of a 66-year-old woman with isolated unilateral hypoglossal paralysis due to cerebral infarction in the centrum semiovale. To date, it has hardly been discussed where the corticolingual tract passes through in the centrum semiovale. Brain magnetic resonance imaging revealed a small ischemic infarction in the contralateral centrum semiovale. We could demonstrate a route of the corticolingual tract.
May 23, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28549884/glomus-tumors-of-the-upper-limb-single-center-retrospective-study-of-clinical-and-functional-outcomes
#17
K Hufschmidt, R Foissac, O Camuzard, N Cardot-Leccia, B Chignon-Sicard, T Balaguer
Glomus tumors are rare and benign hamartomas, arising from neuro-myo-arterial proliferation and deriving from mesenchymal origin. As they have a long-term impact on the individual's quality of life, the primary complaint is unbearable pain. The aim of this study was to assess the clinical and functional outcomes of their surgical treatment, and to review their clinical, radiological and therapeutic features. We performed a retrospective study over a 16-year period including 31 patients with an upper limb glomus tumor...
May 23, 2017: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/28549731/clinical-and-sonographic-biomarkers-of-structural-damage-progression-in-ra-patients-in-clinical-remission-a-prospective-study-with-12-months-follow-up
#18
Julio Ramírez, José Antonio Narváez, Virginia Ruiz-Esquide, Javier Hernández-Gañán, Andrea Cuervo, José Inciarte-Mundo, Maria Victoria Hernández, Miguel Sampayo-Cordero, José Luis Pablos, Raimon Sanmartí, Juan D Cañete
OBJECTIVE: To determine clinical and sonographic biomarkers predicting structural damage progression at 12 months of follow-up as measured by magnetic resonance imaging (MRI) in rheumatoid arthritis (RA) patients in clinical remission. PATIENTS AND METHODS: We included patients with RA in clinical remission, defined as 28-joint disease activity score (DAS28)-erythrocyte sedimentation rate (ESR) <2.6 for >6 months. Ultrasound scans of both hands and knees and MRI of the dominant hand were performed at baseline and at 12 months...
May 1, 2017: Seminars in Arthritis and Rheumatism
https://www.readbyqxmd.com/read/28549650/effect-of-picalm-rs3851179-polymorphism-on-the-default-mode-network-function-in-mild-cognitive-impairment
#19
Ding-Ming Sun, Hai-Feng Chen, Qi-Long Zuo, Fan Su, Feng Bai, Chun-Feng Liu
Alterations in default mode network (DMN) functional connectivity (FC) might accompany the dysfunction of Alzheimer's disease (AD). Indeed, episodic memory impairment is a hallmark of AD, and mild cognitive impairment (MCI) has been associated with a high risk for AD. Phosphatidylinositol-binding clathrin assembly protein (PICALM) (rs3851179) has been associated with AD; in particular, the A allele may serve a protective role, while the G allele serves as a strong genetic risk factor. Therefore, the identification of genetic polymorphisms associated with the DMN is required in MCI subjects...
May 23, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28549636/amplitude-integrated-electroencephalography-improves-the-identification-of-infants-with-encephalopathy-for-therapeutic-hypothermia-and-predicts-neurodevelopmental-outcomes-at-2-years-of-age
#20
Janne Helen Skranes, Gro Løhaugen, Eva Margrethe Schumacher, Damjan Osredkar, Andres Server, Frances Mary Cowan, Tom Stiris, Drude Fugelseth, Marianne Thoresen
OBJECTIVES: To examine whether using an amplitude-integrated electroencephalography (aEEG) severity pattern as an entry criterion for therapeutic hypothermia better selects infants with hypoxic-ischemic encephalopathy and to assess the time-to-normal trace for aEEG and magnetic resonance imaging (MRI) lesion load as 24-month outcome predictors. STUDY DESIGN: Forty-seven infants meeting Norwegian therapeutic hypothermia guidelines were enrolled prospectively. Eight-channel EEG/aEEG was recorded from 6 hours until after rewarming, and read after discharge...
May 23, 2017: Journal of Pediatrics
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