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https://www.readbyqxmd.com/read/28935238/biphasic-aspect-of-sexually-dimorphic-ontogenetic-trajectory-of-gyrification-in-the-ferret-cerebral-cortex
#1
K Sawada, I Aoki
The present study characterized quantitatively sexual dimorphic development of gyrification by MRI-based morphometry. High spatial-resolution 3D MR images (using RARE sequence with short TR and minimum TE setting) were acquired from fixed brain of male and female ferrets at postnatal days (PDs) 4 to 90 using 7-tesla preclinical MRI system. The gyrification index was evaluated either throughout the cerebral cortex (global GI) or in representative primary sulci (sulcal GI). The global GI increased linearly from PD 4, and reached a peak at PD 42, marking 1...
September 18, 2017: Neuroscience
https://www.readbyqxmd.com/read/28922945/aav-gene-therapy-in-a-sheep-model-of-tay-sachs-disease
#2
Heather Gray-Edwards, Ashley N Randle, Stacy Maitland, Hector Benatti, Spencer Hubbard, Peter Canning, Matthew Vogel, Brandon Brunson, Misako Hwang, Lauren Ellis, Allison M Bradbury, Atoska Gentry, Amanda Taylor, Anne Wooldridge, Dewey Wilhite, Randoplh Winter, Brain Whitlock, Jacob A Johnson, Merrilee Holland, Nouha Salibi, Ronald Beyers, James Sartin, Thomas Denney, Nancy R Cox, Miguel Sena-Esteves, Douglas R Martin
Tay-Sachs disease (TSD) is a fatal neurodegenerative disorder caused by a deficiency of the enzyme hexosaminidase A (HexA). Tay-Sachs disease also occurs in sheep, the only experimental model of TSD that has clinical signs of disease. The natural history of sheep TSD was characterized using serial neurological evaluations, 7 tesla MRI, echocardiograms, electrodiagnostics and cerebrospinal fluid (CSF) biomarkers. Intracranial gene therapy was also tested using AAVrh8 monocistronic vectors encoding the α subunit of Hex (TSD α) or a mixture of two vectors encoding both the α and β subunits separately (TSD α+β) injected at high (1...
September 19, 2017: Human Gene Therapy
https://www.readbyqxmd.com/read/28918364/volumetric-changes-in-the-aging-rat-brain-and-its-impact-on-cognitive-and-locomotor-functions
#3
Hamizah Shahirah Hamezah, Lina Wati Durani, Nor Faeizah Ibrahim, Daijiro Yanagisawa, Tomoko Kato, Akihiko Shiino, Sachiko Tanaka, Hanafi Ahmad Damanhuri, Wan Zurinah Wan Ngah, Ikuo Tooyama
Impairments in cognitive and locomotor functions usually occur with advanced age, as do changes in brain volume. This study was conducted to assess changes in brain volume, cognitive and locomotor functions, and oxidative stress levels in middle- to late-aged rats. Forty-four male Sprague-Dawley rats were divided into four groups: 14, 18, 23, and 27months of age. (1)H magnetic resonance imaging (MRI) was performed using a 7.0-Tesla MR scanner system. The volumes of the lateral ventricles, medial prefrontal cortex (mPFC), hippocampus, striatum, cerebellum, and whole brain were measured...
September 13, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28905134/postmortem-mr-diffusion-weighted-imaging-of-the-liver-time-behavior-of-the-hepatic-apparent-diffusion-coefficient-in-the-early-death-interval
#4
Sarah Keller, Tony M Schmidt, Anne Catherine Kim, Roland Fischer, Axel Heinemann, Gerhard Adam, Jin Yamamura
OBJECTIVE: The objective of this study is to assess postmortem changes of the hepatic apparent diffusion coefficient (ADC) at multiple time points in the time interval of 16 hours postmortem in comparison to in vivo controls and to literature data. MATERIAL AND METHODS: Hepatic diffusion-weighted imaging (DWI) was repeatedly performed at 1.5 Tesla (b values 50, 400, and 800 s/mm(2)) in 2-hourly steps within 16 hours postmortem in 19 cases (male to female 13:6, mean age 68...
September 14, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28901137/a-metamaterial-combining-electric-and-magnetic-dipole-based-configurations-for-unique-dual-band-signal-enhancement-in-ultra-high-field-magnetic-resonance-imaging
#5
Rita Schmidt, Andrew Webb
Magnetic resonance imaging and spectroscopy (MRI and MRS) are both widely used techniques in medical diagnostics and research. One of the major thrusts in recent years has been the introduction of ultra-high field magnets in order to boost the sensitivity. Several MRI studies have examined further potential improvements in sensitivity using metamaterials, focusing on single frequency applications. However, metamaterials have yet to reach a level which is practical for routine MRI use. In this work, we explore a new metamaterial implementation for MRI, a dual-nuclei resonant structure, which can be used for both proton and heteronuclear magnetic resonance...
September 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28894296/test-retest-reliability-of-high-spatial-resolution-diffusion-tensor-and-diffusion-kurtosis-imaging
#6
Pashtun Shahim, Laurena Holleran, Joong H Kim, David L Brody
We assessed the test-retest reliability of high spatial resolution diffusion tensor imaging (DTI) and diffusion kurtosis imaging (DKI). Diffusion MRI was acquired using a Siemens 3 Tesla Prisma scanner with 80 mT/m gradients and a 32-channel head coil from each of 3 concussive traumatic brain injury (cTBI) patients and 4 controls twice 0 to 24 days apart. Coefficients of variation (CoV) for DTI parameters were calculated in each DTI Studio parcellated white matter tract at 1.25 mm and 1.75 mm isotropic voxel resolution, as well as DKI parameters at 1...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28888042/effect-of-a-multinutrient-intervention-after-ischemic-stroke-in-female-c57bl-6-mice
#7
Maximilian Wiesmann, Nienke M Timmer, Bastian Zinnhardt, Dirk Reinhard, Sarah Eligehausen, Anja Königs, Hasnae Ben Jeddi, Pieter J Dederen, Andreas H Jacobs, Amanda J Kiliaan
Stroke can affect females very differently from males, and therefore preclinical research on underlying mechanisms and the effects of interventions should not be restricted to male subjects, and treatment strategies for stroke should be tailored to benefit both sexes. Previously, we demonstrated that a multinutrient intervention (Fortasyn) improved impairments after ischemic stroke induction in male C57Bl/6 mice, but the therapeutic potential of this dietary treatment remained to be investigated in females...
September 9, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28881750/new-in-vivo-avatars-of-diffuse-intrinsic-pontine-gliomas-dipg-from-stereotactic-biopsies-performed-at-diagnosis
#8
Alexandre Plessier, Ludivine Le Dret, Pascale Varlet, Kévin Beccaria, Joëlle Lacombe, Sébastien Mériaux, Françoise Geffroy, Laurence Fiette, Patricia Flamant, Fabrice Chrétien, Thomas Blauwblomme, Stéphanie Puget, Jacques Grill, Marie-Anne Debily, David Castel
Diffuse Instrinsic Pontine Glioma is the most aggressive form of High Grade Gliomas in children. The lack of biological material and the absence of relevant models have hampered the development of new therapeutics. Their extensive infiltration of the brainstem renders any surgical resection impossible and until recently biopsies were considered not informative enough and therefore not recommended. Thus, most models were derived from autopsy material. We aimed to develop relevant in vivo DIPG models that mimic this specific disease and its molecular diversity from tumor material obtained at diagnosis...
August 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/28880381/evaluation-of-feasibility-of-1-5-tesla-prostate-mri-using-body-coil-rf-transmit-in-a-patient-with-an-implanted-vagus-nerve-stimulator
#9
Christopher P Favazza, Heidi A Edmonson, Chi Ma, Yunhong Shu, Joel P Felmlee, Robert E Watson, Krzysztof R Gorny
PURPOSE: To assess risks of RF-heating of a vagus nerve stimulator (VNS) during 1.5T prostate MRI using body coil transmit and to compare these risks with those associated with MRI head exams using a transmit/receive head coil. METHODS: Spatial distributions of radio-frequency (RF) B1 fields generated by transmit/receive (T/R) body and head coils were empirically assessed along the long axis of a 1.5 T MRI scanner bore. Measurements were obtained along the center axis of the scanner and laterally offset by 15 cm (body coil) and 7 cm (head coil)...
September 7, 2017: Medical Physics
https://www.readbyqxmd.com/read/28871385/dynamic-3t-pelvic-floor-magnetic-resonance-imaging-in-women-progressing-from-the-nulligravid-to-the-primiparous-state
#10
Mark E Lockhart, G Wright Bates, Desiree E Morgan, Timothy M Beasley, Holly E Richter
INTRODUCTION AND HYPOTHESIS: The objective was to prospectively characterize dynamic pelvic 3-Tesla magnetic resonance imaging (dp3T MRI) findings in nulligravida women and characterize changes 6 months after delivery in the same woman. METHODS: In this prospective study, nulligravida women seeking assisted reproductive technology for pregnancy were recruited. After physical examination by Pelvic Organ Prolapse Quantification (POP-Q), Brink assessment and measures including the Pelvic Floor Distress Inventory-20 and Pelvic Floor Impact Questionnaire-7, pre-pregnancy dp3T MRI at rest, with strain, and evacuation were performed...
September 4, 2017: International Urogynecology Journal
https://www.readbyqxmd.com/read/28854273/high-resolution-imaging-of-the-mitral-valve-in-the-natural-state-with-7-tesla-mri
#11
Sam E Stephens, Serguei Liachenko, Neil B Ingels, Jonathan F Wenk, Morten O Jensen
Imaging techniques of the mitral valve have improved tremendously during the last decade, but challenges persist. The delicate changes in annulus shape and papillary muscle position throughout the cardiac cycle have significant impact on the stress distribution in the leaflets and chords, thus preservation of anatomically accurate positioning is critical. The aim of this study was to develop an in vitro method and apparatus for obtaining high-resolution 3D MRI images of porcine mitral valves in both the diastolic and systolic configurations with physiologically appropriate annular shape, papillary muscle positions and orientations, specific to the heart from which the valve was harvested...
2017: PloS One
https://www.readbyqxmd.com/read/28806768/design-and-fabrication-of-a-realistic-anthropomorphic-heterogeneous-head-phantom-for-mr-purposes
#12
Sossena Wood, Narayanan Krishnamurthy, Tales Santini, Shailesh Raval, Nadim Farhat, John Andy Holmes, Tamer S Ibrahim
OBJECTIVE: The purpose of this study is to design an anthropomorphic heterogeneous head phantom that can be used for MRI and other electromagnetic applications. MATERIALS AND METHODS: An eight compartment, physical anthropomorphic head phantom was developed from a 3T MRI dataset of a healthy male. The designed phantom was successfully built and preliminarily evaluated through an application that involves electromagnetic-tissue interactions: MRI (due to it being an available resource)...
2017: PloS One
https://www.readbyqxmd.com/read/28798039/physical-activity-during-adolescence-and-the-development-of-cam-morphology-a-cross-sectional-cohort-study-of-210-individuals
#13
Antony Palmer, Scott Fernquest, Mo Gimpel, Richard Birchall, Andrew Judge, John Broomfield, Julia Newton, Mark Wotherspoon, Andrew Carr, Sion Glyn-Jones
INTRODUCTION: Cam morphology is a strong risk factor for the development of hip pain and osteoarthritis. It is increasingly thought to develop in association with intense physical activity during youth; however, the aetiology remains uncertain. The study aim was to characterise the effect of physical activity on morphological hip development during adolescence. METHODS: Cross-sectional study of individuals aged 9-18 years recruited from Southampton Football Club Academy (103 male) with an age-matched control population (52 males and 55 females)...
August 10, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28796602/contrast-enhanced-magnetic-resonance-imaging-of-gastric-emptying-and-motility-in-rats
#14
Kun-Han Lu, Jiayue Cao, Steven Oleson, Terry L Powley, Zhongming Liu
The assessment of gastric emptying and motility in humans and animals typically requires radioactive imaging or invasive measurements. Here, we developed a robust strategy to image and characterize gastric emptying and motility in rats based on contrast-enhanced magnetic resonance imaging (MRI) and computer-assisted image processing. The animals were trained to naturally consume a gadolinium-labeled dietgel while bypassing any need for oral gavage. Following this test meal, the animals were scanned under low-dose anesthesia for high-resolution T1-weighted MRI in 7-Tesla, visualizing the time-varying distribution of the meal with greatly enhanced contrast against non-GI tissues...
August 8, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28782259/prenatal-assessment-of-cerebellar-vermian-lobulation-fetal-mri-with-3-tesla-post-mortem-correlation
#15
Gregor O Dovjak, Peter C Brugger, Gerlinde M Gruber, Jae W Song, Michael Weber, Georg Langs, Dieter Bettelheim, Daniela Prayer, Gregor Kasprian
OBJECTIVES: To optimize the imaging assessment of fetal hindbrain malformations, this observational MRI study aimed to provide quantitative biometric data in normal vermian development in human fetal brains in vivo. METHODS: In this retrospective, review board approved study, 78 fetuses (18-32 gestational weeks (GW)) scanned prenatally at 1.5T, and seven fetuses (16-30GW), scanned within 24 hours post-mortem at 3T,were included. All fetal brains were segmented on a T2-weighted midline sagittal slice...
August 6, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28781201/seven-tesla-mri-of-the-substantia-nigra-in-patients-with-rapid-eye-movement-sleep-behavior-disorder
#16
Daniela Frosini, Mirco Cosottini, Graziella Donatelli, Mauro Costagli, Laura Biagi, Claudio Pacchetti, Michele Terzaghi, Pietro Cortelli, Dario Arnaldi, Enrica Bonanni, Michela Tosetti, Ubaldo Bonuccelli, Roberto Ceravolo
INTRODUCTION: Susceptibility-weighted imaging of the substantia nigra (SN) both at 7 and 3 Tesla (T) has shown high accuracy in distinguishing patients with Parkinson's disease (PD) and healthy subjects (HS). Patients with rapid eye movement (REM) behavior disorder (RBD) can develop synucleinopathies, and such risk is higher with dopamine transporter single photon emission tomography (123I-FP-CIT SPECT) evidence of nigro-striatal dysfunction. We aimed at evaluating SN 7T magnetic resonance imaging (7T-MRI) in patients with RBD and determining the agreement between MRI and 123I-FP-CIT SPECT...
August 2, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/28749070/diagnostic-accuracy-of-magnetic-resonance-imaging-mri-5-point-likert-scoring-system-evaluated-by-the-result-of-mri-ultrasonography-image-fusion-targeted-biopsy-of-the-prostate
#17
Toshitaka Shin, Thomas B Smyth, Osamu Ukimura, Nariman Ahmadi, Andre Luis de Castro Abreu, Chisato Ohe, Masakatsu Oishi, Hiromitsu Mimata, Inderbir S Gill
OBJECTIVE: To evaluate the accuracy of MRI based Likert scoring system in detection of clinically significant prostate cancer (CSPC) using MRI/Ultrasonography (US) image-fusion targeted biopsy (FTB) as a reference standard. PATIENTS AND METHODS: We retrospectively reviewed 1218 MRI-lesions in 629 patients who underwent subsequent MRI/US FTB between 10/2012 and 8/2015. 3-Tesla MRI was independently reported by 1 of 8 radiologists with varying levels of experience and scored on a 5-point Likert scale...
July 27, 2017: BJU International
https://www.readbyqxmd.com/read/28743633/an-intra-neural-microstimulation-system-for-ultra-high-field-magnetic-resonance-imaging-and-magnetoencephalography
#18
Paul M Glover, Roger H Watkins, George C O'Neill, Rochelle Ackerley, Rosa Sanchez-Panchuelo, Francis McGlone, Matthew J Brookes, Johan Wessberg, Susan T Francis
BACKGROUND: Intra-neural microstimulation (INMS) is a technique that allows the precise delivery of low-current electrical pulses into human peripheral nerves. Single unit INMS can be used to stimulate individual afferent nerve fibres during microneurography. Combining this with neuroimaging allows the unique monitoring of central nervous system activation in response to unitary, controlled tactile input, with functional magnetic resonance imaging (fMRI) providing exquisite spatial localisation of brain activity and magnetoencephalography (MEG) high temporal resolution...
October 1, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28739431/protocol-optimization-of-sacroiliac-joint-mr-imaging-at-3-tesla-impact-of-coil-design-and-motion-resistant-sequences-on-image-quality
#19
P A Gondim Teixeira, M Bravetti, G Hossu, S Lecocq, D Petit, D Loeuille, A Blum
PURPOSE: To evaluate the impact of coil design and motion-resistant sequences on the quality of sacroiliac magnetic resonance imaging (MRI) examination in patients with spondyloarthropathy. PATIENTS AND METHODS: One hundred and twenty-one patients with suspected sacroiliitis and referred for MRI of the sacroiliac joints were retrospectively evaluated with MRI at 3-Tesla. There were 78 women and 43 men with a mean age of 36.7±11.5 (SD) years (range: 15.8-78.4 years)...
July 21, 2017: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/28735913/gray-matter-abnormalities-of-the-dorsal-posterior-cingulate-in-sleep-walking
#20
Anna Heidbreder, Ambra Stefani, Elisabeth Brandauer, Ruth Steiger, Christian Kremser, Elke R Gizewski, Peter Young, Werner Poewe, Birgit Högl, Christoph Scherfler
OBJECTIVE: This study aimed to determine whether voxel-based analysis of T1 weighted magnetic resonance imaging (MRI) and diffusion tensor imaging is able to detect alterations of gray and white matter morphometry as well as measures of mean diffusivity and fractional anisotropy in patients with non-rapid eye movement parasomnia. METHODS: 3 Tesla MRI was performed in 14 drug-free, polysomnography-confirmed adult patients with non-rapid eye movement parasomnia (age: 29 ± 4...
August 2017: Sleep Medicine
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