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high resolution MRI

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https://www.readbyqxmd.com/read/28937274/visualization-of-the-lumbar-nerve-using-reduced-field-of-view-diffusion-tensor-imaging
#1
Yawara Eguchi, Hirohito Kanamoto, Sumihisa Orita, Kazuhide Inage, Kazuki Fujimoto, Yasuhiro Shiga, Koki Abe, Masahiro Inoue, Hideyuki Kinoshita, Koji Matsumoto, Yoshitada Masuda, Masao Koda, Yasuchika Aoki, Yasuhiro Oikawa, Kazuhisa Takahashi, Seiji Ohtori, Takeo Furuya, Atsuya Watanabe
OBJECTIVE: We investigated high resolution diffusion tensor imaging (DTI) of lumbar nerves with reduced field-of-view (rFOV) using 3-Tesla MRI. METHODS: DTI measured with rFOV was compared with conventional FOV (cFOV) 3.0 T MRI in 5 healthy volunteers and 10 patients with degenerative lumbar disorders. The intracanal, foramina, and extraforamina of the L5 nerve were established as the regions-of-interest (ROI) and fractional anisotropy (FA) values and apparent diffusion coefficient (ADC) values were measured...
September 13, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28936758/mucinous-cystic-neoplasms-of-the-pancreas-high-resolution-cross-sectional-imaging-features-with-clinico-pathologic-correlation
#2
Alejandro Garces-Descovich, Kevin Beker, Manuel Castillo-Angeles, Alexander Brook, Elena Resnick, Shweta Shinagare, Robert M Najarian, Koenraad J Mortele
PURPOSE: To describe the high-resolution cross-sectional (MDCT/MRI) features of mucinous cystic neoplasms (MCN) of the pancreas with clinico-pathologic correlation; to identify imaging predictors of high-grade dysplasia/carcinoma; and to estimate MCN growth rate. MATERIALS AND METHODS: Thirty-two women (mean age: 46; range, 25-79 years) with resected MCN who underwent preoperative MDCT (n = 20) or MRI (n = 12) examinations over a 14-year period were included...
September 21, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28936540/-chondral-and-osteochondral-defects-representation-by-imaging-methods
#3
REVIEW
S Nebelung, B Rath, M Tingart, C Kuhl, S Schrading
Morphological imaging of cartilage at high resolution allows the differentiation of chondral and osteochondral lesions. Nowadays, magnetic resonance imaging is the principal diagnostic tool in the assessment of cartilage structure and composition. Conventional radiography, computed tomography, ultrasound or optical coherence tomography are adjunct diagnostic modalities in the assessment of cartilage pathologies. The present article discusses the up-to-date diagnostic practice of cartilage imaging in terms of its scientific basis and current clinical status, requirements, techniques and image interpretation...
September 21, 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28935238/biphasic-aspect-of-sexually-dimorphic-ontogenetic-trajectory-of-gyrification-in-the-ferret-cerebral-cortex
#4
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/28933672/cognitive-impairment-and-the-regional-distribution-of-cerebellar-lesions-in-multiple-sclerosis
#5
Sean M Tobyne, Wilson B Ochoa, J Daniel Bireley, Victoria Mj Smith, Jeroen Jg Geurts, Jeremy D Schmahmann, Eric C Klawiter
BACKGROUND: Cerebellar lesions are often reported in relapsing-remitting multiple sclerosis (RRMS) and have been associated with impaired motor function and cognitive status. However, prior research has primarily focused on summary measures of cerebellar involvement (e.g. total lesion load, gray/white matter volume) and not on the effect of lesion load within specific regions of cerebellar white matter. OBJECTIVE: Spatially map the probability of cerebellar white matter lesion (CWML) occurrence in RRMS and explore the relationship between cognitive impairment and lesion (CWML) location within the cerebellum...
September 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28932410/quantitative-characterization-of-optic-nerve-atrophy-in-patients-with-multiple-sclerosis
#6
Robert L Harrigan, Alex K Smith, Bailey Lyttle, Bailey Box, Bennett A Landman, Francesca Bagnato, Siddharama Pawate, Seth A Smith
BACKGROUND: Optic neuritis (ON) is one of the most common presentations of multiple sclerosis (MS). Magnetic resonance imaging (MRI) of the optic nerves is challenging because of retrobulbar motion, orbital fat and susceptibility artifacts from maxillary sinuses; therefore, axonal loss is investigated with the surrogate measure of a single heuristically defined point along the nerve as opposed to volumetric investigation. OBJECTIVE: The objective of this paper is to derive optic nerve volumetrics along the entire nerve length in patients with MS and healthy controls in vivo using high-resolution, clinically viable MRI...
July 2017: Multiple Sclerosis Journal—Experimental, Translational and Clinical
https://www.readbyqxmd.com/read/28929419/high-resolution-mr-imaging-for-dental-impressions-a-feasibility-study
#7
Julian Boldt, Kurt Rottner, Marc Schmitter, Andreas Hopfgartner, Peter Jakob, Ernst-Jürgen Richter, Olga Tymofiyeva
OBJECTIVES: Magnetic resonance imaging is an emerging technology in dental medicine. While low-resolution MRI has especially provided means to examine the temporomandibular joint due to its anatomic inaccessibility, it was the goal of this study to assess whether high-resolution MRI is capable of delivering a dataset sufficiently precise enough to serve as digital impression of human teeth. MATERIALS AND METHODS: An informed and consenting patient in need of dental restoration with fixed partial dentures was chosen as subject...
September 19, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28928491/freezing-of-gait-is-associated-with-cortical-thinning-in-mesial-frontal-cortex
#8
Miroslav Vastik, Pavel Hok, Jan Valosek, Petr Hlustik, Katerina Mensikova, Petr Kanovsky
AIMS: The relationship between freezing of gait (FOG) and regional brain atrophy has been intensively investigated, but it is still not clearly understood. The study objective was to test whether grey matter (GM) atrophy contributes to FOG in Parkinson´s disease (PD) using a surface-based algorithm. METHODS: We investigated 21 patients with PD, 11 with FOG and 10 without FOG. Both groups were assessed using a FOG questionnaire and Hoehn and Yahr staging. High resolution T1-weighted brain images were acquired for each subject using a 1...
September 13, 2017: Biomedical Papers of the Medical Faculty of the University Palacký, Olomouc, Czechoslovakia
https://www.readbyqxmd.com/read/28926839/visualization-of-culprit-perforators-in-anterolateral-pontine-infarction-high-resolution-magnetic-resonance-imaging-study
#9
Sang Hun Lee, Seung Chai Jung, Dong Wha Kang, Sun U Kwon, Jong S Kim
BACKGROUND: The stroke mechanism for anterolateral pontine infarction (ALPI) is poorly understood. We aimed to investigate the perforator arteries relevant to ALPI using high-resolution MRI (HR-MRI). METHODS: Of 62 patients with ALPI who were admitted to the Asan Medical Center, 13 patients agreed to participate in this study. We used HR-MRI with a 3-Tesla scanner and assessed the perforating branches directly connected with the infarcted area. RESULTS: Perforating arteries penetrating ALPI were identified in all 13 patients...
September 19, 2017: European Neurology
https://www.readbyqxmd.com/read/28926154/brain-functional-connectome-abnormalities-in-als-are-associated-with-disability-and-cortical-hyperexcitability
#10
Nimeshan Geevasinga, Mayuresh S Korgaonkar, Parvathi Menon, Mehdi Van den Bos, Lavier Gomes, Sheryl Foster, Matthew C Kiernan, Steve Vucic
OBJECTIVE: The present study utilized a multimodality approach encompassing connectome network combined with brain volume analysis, and assessment of cortical excitability to provide novel insights into amyotrophic lateral sclerosis (ALS) pathogenesis. METHODS: Magnetic resonance images (MRI) were acquired using a 3.0 Tesla GE Signa HDx scanner, using an 8-channel head coil. MR images for the resting state scan were acquired using echo planar imaging MR sequence, acquiring 40 contiguous axial/oblique slices...
September 19, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28926131/region-specific-impairment-of-the-cervical-spinal-cord-sc-in-amyotrophic-lateral-sclerosis-a-preliminary-study-using-sc-templates-and-quantitative-mri-diffusion-tensor-imaging-inhomogeneous-magnetization-transfer
#11
Henitsoa Rasoanandrianina, Aude-Marie Grapperon, Manuel Taso, Olivier M Girard, Guillaume Duhamel, Maxime Guye, Jean-Philippe Ranjeva, Shahram Attarian, Annie Verschueren, Virginie Callot
In this preliminary study, our objective was to investigate the potential of high-resolution anatomical imaging, diffusion tensor imaging (DTI) and conventional/inhomogeneous magnetization transfer imaging [magnetization transfer (MT)/inhomogeneous magnetization transfer (ihMT)] at 3 T, analyzed with template-extracted regions of interest, to measure the atrophy and structural changes of white (WM) and gray (GM) matter spinal cord (SC) occurring in patients with amyotrophic lateral sclerosis (ALS). Ten patients with ALS and 20 age-matched healthy controls were recruited...
September 19, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28924922/assessing-the-non-tumorous-liver-implications-for-patient-management-and-surgical-therapy
#12
Pallavi Pandey, Ankur Pandey, Mary Dillhoff, Carl Schmidt, Ihab R Kamel, Timothy M Pawlik
INTRODUCTION: Hepatic resection is performed for various benign and malignant liver tumors. Over the last several decades, there have been improvements in the surgical technique and postoperative care of patients undergoing liver surgery. Despite this, liver failure following an extended hepatic resection remains a critical potential postoperative complication. Patients with underlying parenchymal liver diseases are at particular risk of liver failure due to impaired liver regeneration with an associated mortality risk as high as 60 to 90%...
September 18, 2017: Journal of Gastrointestinal Surgery: Official Journal of the Society for Surgery of the Alimentary Tract
https://www.readbyqxmd.com/read/28924482/atypical-presentation-of-central-pontine-myelinolysis-in-hyperglycemia
#13
Swapna Talluri, Raghu Charumathi, Muhammad Khan, Kerri Kissell
Central pontine myelinolysis (CPM) usually occurs with rapid correction of severe chronic hyponatremia. Despite the pronounced fluctuations in serum osmolality, CPM is rarely seen in diabetics. This is a case report of CPM associated with hyperglycemia. A 45-year-old non-smoking and non-alcoholic African American male with past medical history of type 2 diabetes, hypertension, stage V chronic kidney disease and hypothyroidism presented with a two-week history of intermittent episodes of gait imbalance, slurred speech and inappropriate laughter...
2017: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/28923276/rapid-whole-brain-resting-state-fmri-at-3%C3%A2-tesla-efficiency-optimized-three-dimensional-epi-versus-repetition-time-matched-simultaneous-multi-slice-epi
#14
Rüdiger Stirnberg, Willem Huijbers, Daniel Brenner, Benedikt A Poser, Monique Breteler, Tony Stöcker
State-of-the-art simultaneous-multi-slice (SMS-)EPI and 3D-EPI share several properties that benefit functional MRI acquisition. Both sequences employ equivalent parallel imaging undersampling with controlled aliasing to achieve high temporal sampling rates. As a volumetric imaging sequence, 3D-EPI offers additional means of acceleration complementary to 2D-CAIPIRINHA sampling, such as fast water excitation and elliptical sampling. We performed an application-oriented comparison between a tailored, six-fold CAIPIRINHA-accelerated 3D-EPI protocol at 530 ms temporal and 2...
September 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/28918510/acquired-hepatocerebral-degeneration-ahd-a-peculiar-neurological-impairment-in-advanced-chronic-liver-disease
#15
A Pigoni, F Iuculano, C Saetti, L Airaghi, L Burdick, S Spreafico, M Curioni, R Lombardi, L Valenti, A L Fracanzani, S Fargion
We discuss the case of a rare and often unrecognized neurologic syndrome, called Acquired Hepatocerebral Degeneration (AHD), observed in patients with advanced liver disease and portosystemic shunts. The clinical manifestations can be very heterogeneous and in our case included a combination of cerebellar and extrapyramidal signs, arisen in a period of few days. Brain Magnetic Resonance Imaging (MRI) showed, in T1-weighted images, diffuse bilateral hyper intensities in basal ganglia and biemispheric brain and cerebellar cortices, resembling paramagnetic deposits...
September 16, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/28918385/wall-enhancement-ratio-and-partial-wall-enhancement-on-mri-associated-with-the-rupture-of-intracranial-aneurysms
#16
Guang-Xian Wang, Li Wen, Sheng Lei, Qian Ran, Jin-Bo Yin, Zi-Li Gong, Dong Zhang
OBJECTIVES: To evaluate the risk factors for rupture of intracranial aneurysms (IAs) using high resolution MRI (HRMRI). METHODS: 91 consecutive patients with 106 IAs were reviewed from February 2016 to April 2017. Patients and IAs were divided into ruptured and unruptured groups. In addition to the clinical characteristics of the patients, the features of IAs (eg, shape) were evaluated by CT angiography, whereas wall thickness, enhanced patterns, and enhancement ratio (ER) were evaluated by MRI...
September 16, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28917278/combining-functional-studies-with-intraoperative-mri-in-glioma-surgery
#17
REVIEW
Daria Krivosheya, Sujit S Prabhu
Maximal safe resection is the cornerstone of treatment for low-grade and high-grade gliomas. In addition to high-resolution anatomic MRI studies that highlight tumor architecture, it is important to determine the relationship of the tumor to the eloquent cortical and subcortical areas to avoid introducing or exacerbating a neurologic deficit. The goal of this review was to highlight imaging modalities that provide functional information and can be integrated with intraoperative MRI navigation to maximize the extent of resection while preserving a patient's neurologic function...
October 2017: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/28912749/functional-connectivity-of-the-corpus-callosum-in-epilepsy-patients-with-secondarily-generalized-seizures
#18
Syu-Jyun Peng, Yue-Loong Hsin
The corpus callosum (CC) plays an important role in generalization of seizure activity. We used resting-state function magnetic resonance imaging (rs-fMRI) to investigate the regional and interregional functional connectivity of CC in patients with magnetic resonance imaging (MRI)-negative and secondarily generalized seizures. We measured the multi-regional coherences of blood oxygen level-dependent (BOLD) signals via rs-fMRI, cortical thickness via high-resolution T1-weighted MRI, and white matter (WM) integrity via diffusion-tensor imaging in 16 epilepsy patients as well as in 16 age- and gender-matched healthy subjects...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28912147/performance-of-a-pet-insert-for-high-resolution-small-animal-pet-mr-imaging-at-7t
#19
Greg Stortz, Jonathan D Thiessen, Daryl Bishop, Muhammad S Khan, Piotr Kozlowski, Fabrice Retière, Graham Schellenberg, Ehsan Shams, Xuezhu Zhang, Christopher J Thompson, Andrew Goertzen, Vesna Sossi
We present the characterization of a compact magnetic resonance (MR) compatible positron emission tomography (PET) insert for simultaneous pre-clinical PET/MR imaging. While specifically designed with the strict size constraint to fit inside the 114 mm inner diameter of the BGA-12S gradient coil used in the Bruker 70/20 and 94/20 series of small animal MR imaging (MRI) systems, the insert can be easily installed in any appropriate MRI scanner or used as a stand-alone PET system. Methods: The insert is made from a ring of 16 detector-blocks each made from depth-of-interaction capable dual-layer-offset arrays of cerium-doped lutetium-yttrium oxyorthosilicate crystals read out by silicon photomultiplier (SiPM) arrays...
September 14, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28905414/high-spatio-temporal-resolution-in-functional-mri-with-3d-echo-planar-imaging-using-cylindrical-excitation-and-a-caipirinha-undersampling-pattern
#20
Wietske van der Zwaag, Olivier Reynaud, Mayur Narsude, Daniel Gallichan, José P Marques
PURPOSE: The combination of 3D echo planar imaging (3D-EPI) with a 2D-CAIPIRINHA undersampling scheme provides high flexibility in the optimization for spatial or temporal resolution. This flexibility can be increased further with the addition of a cylindrical excitation pulse, which exclusively excites the brain regions of interest. Here, 3D-EPI was combined with a 2D radiofrequency pulse to reduce the brain area from which signal is generated, and hence, allowing either reduction of the field of view or reduction of parallel imaging noise amplification...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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