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MRI 7 Tesla

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https://www.readbyqxmd.com/read/28516048/image-interpolation-improves-the-zonal-analysis-of-cartilage-t2-relaxation-in-mri
#1
Farid Badar, Yang Xia
BACKGROUND: This project aimed to investigate the improvement in the detection of osteoarthritis (OA) in cartilage by the interpolation of T2 images, in the situation when the native MRI resolution is insufficient to resolve the depth-dependent T2 characteristics in articular cartilage (AC). METHODS: Eighteen intact canine knee joints that were healthy or had mild (contralateral) or severe OA were T2-imaged in a 7T/20 cm MRI system at 200 µm/pixel resolution (macro-MRI)...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28508007/five-year-outcomes-after-treatment-for-acute-instability-of-the-tibiofibular-syndesmosis-using-a-suture-button-fixation-system
#2
Paul F Förschner, Knut Beitzel, Andreas B Imhoff, Stefan Buchmann, Georg Feuerriegel, Felix Hofmann, Dimitrios C Karampinos, Pia Jungmann, Jonas Pogorzelski
BACKGROUND: Suture-button repair is a widely accepted surgical treatment for acute and isolated ankle syndesmosis injuries. To our knowledge, midterm results have not previously been reported. PURPOSE: To evaluate the clinical, qualitative, and quantitative radiological midterm outcomes of suture-button repair after acute isolated ankle syndesmosis injuries. STUDY DESIGN: Retrospective case series; Level of evidence, 4. METHODS: Clinical outcomes were measured using the Foot and Ankle Disability Index (FADI) and the American Orthopaedic Foot and Ankle Society (AOFAS) score...
April 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28501822/structural-mri-correlates-of-amyotrophic-lateral-sclerosis-progression
#3
Joe Senda, Naoki Atsuta, Hirohisa Watanabe, Epifanio Bagarinao, Kazunori Imai, Daichi Yokoi, Yuichi Riku, Michihito Masuda, Ryoichi Nakamura, Hazuki Watanabe, Mizuki Ito, Masahisa Katsuno, Shinji Naganawa, Gen Sobue
PURPOSE: Amyotrophic lateral sclerosis (ALS) presents with varying degrees of brain degeneration that can extend beyond the corticospinal tract (CST). Furthermore, the clinical course and progression of ALS varies widely. Brain degeneration detected using structural MRI could reflect disease progression. SUBJECTS AND METHODS: On study registration, 3-Tesla volumetric MRI and diffusion tensor imaging scans were obtained at baseline in 38 healthy controls and 67 patients with sporadic ALS...
May 13, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28498852/ultra-high-field-7tesla-magnetic-resonance-spectroscopy-in-amyotrophic-lateral-sclerosis
#4
Nazem Atassi, Maosheng Xu, Christina Triantafyllou, Boris Keil, Robert Lawson, Paul Cernasov, Elena Ratti, Christopher J Long, Sabrina Paganoni, Alyssa Murphy, Nouha Salibi, Ravi Seethamraju, Bruce Rosen, Eva-Maria Ratai
The main objective of this study was to utilize high field (7T) in vivo proton magnetic resonance imaging to increase the ability to detect metabolite changes in people with ALS, specifically, to quantify levels of glutamine and glutamine separately. The second objective of this study was to correlate metabolic markers with clinical outcomes of disease progression. 13 ALS participants and 12 age-matched healthy controls (HC) underwent 7 Tesla MRI and MRS. Single voxel MR spectra were acquired from the left precentral gyrus using a very short echo time (TE = 5 ms) STEAM sequence...
2017: PloS One
https://www.readbyqxmd.com/read/28495210/3-tesla-23-na-magnetic-resonance-imaging-during-acute-kidney-injury
#5
Matthias Hammon, Susan Grossmann, Peter Linz, Hannes Seuss, Rebecca Hammon, Daniela Rosenhauer, Rolf Janka, Alexander Cavallaro, Friedrich C Luft, Jens Titze, Michael Uder, Anke Dahlmann
RATIONALE AND OBJECTIVES: Sodium and proton magnetic resonance imaging ((23)Na/(1)H-MRI) have shown that muscle and skin can store Na(+) without water. In chronic renal failure and in heart failure, Na(+) mobilization occurs, but is variable depending on age, dialysis vintage, and other features. Na(+) storage depots have not been studied in patients with acute kidney injury (AKI). MATERIALS AND METHODS: We studied 7 patients with AKI (mean age: 51.7 years; range: 25-84) and 14 age-matched and gender-matched healthy controls...
May 8, 2017: Academic Radiology
https://www.readbyqxmd.com/read/28491492/associations-between-hippocampal-morphometry-and-neuropathologic-markers-of-alzheimer-s-disease-using-7%C3%A2-t-mri
#6
Anna E Blanken, Sona Hurtz, Chris Zarow, Kristina Biado, Hedieh Honarpisheh, Johanne Somme, Jenny Brook, Spencer Tung, Emily Kraft, Darrick Lo, Denise W Ng, Harry V Vinters, Liana G Apostolova
Hippocampal atrophy, amyloid plaques, and neurofibrillary tangles are established pathologic markers of Alzheimer's disease. We analyzed the temporal lobes of 9 Alzheimer's dementia (AD) and 7 cognitively normal (NC) subjects. Brains were scanned post-mortem at 7 Tesla. We extracted hippocampal volumes and radial distances using automated segmentation techniques. Hippocampal slices were stained for amyloid beta (Aβ), tau, and cresyl violet to evaluate neuronal counts. The hippocampal subfields, CA1, CA2, CA3, CA4, and subiculum were manually traced so that the neuronal counts, Aβ, and tau burden could be obtained for each region...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28490772/flexible-and-compact-hybrid-metasurfaces-for-enhanced-ultra-high-field-in-vivo-magnetic-resonance-imaging
#7
Rita Schmidt, Alexey Slobozhanyuk, Pavel Belov, Andrew Webb
Developments in metamaterials and related structures such as metasurfaces have opened up new possibilities in designing materials and devices with unique properties. Here we report a new hybrid metasurface structure, comprising a two-dimensional metamaterial surface and a very high permittivity dielectric substrate, that has been designed to enhance the local performance of an ultra-high field MRI scanner. This new flexible and compact resonant structure is the first metasurface which can be integrated with multi-element close-fitting receive coil arrays that are used for all clinical MRI scans...
May 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28464368/leptomeningeal-enhancement-at-7t-in-multiple-sclerosis-frequency-morphology-and-relationship-to-cortical-volume
#8
Daniel M Harrison, Kevin Y Wang, Julie Fiol, Kerry Naunton, Walter Royal, Jun Hua, Izlem Izbudak
BACKGROUND AND PURPOSE: Perform an investigation of the frequency and distribution of leptomeningeal enhancement on postgadolinium magnetization-prepared FLAIR (MPFLAIR) in multiple sclerosis (MS) on 7 Tesla (7T) MRI and to relate this finding to measures of brain structure and lesion volumes. METHODS: Twenty-nine participants with MS underwent 7T MRI of the brain. Three healthy volunteers (HVs) were scanned for comparison. Areas of postcontrast leptomeningeal enhancement were identified...
May 2, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28436255/detection-and-characterization-of-small-infarcts-in-the-caudate-nucleus-on-7-tesla-mri-the-smart-mr-study
#9
Rashid Ghaznawi, Jeroen de Bresser, Yolanda van der Graaf, Maarten Ht Zwartbol, Theo D Witkamp, Mirjam I Geerlings, Jeroen Hendrikse
Small infarcts are among the key imaging features of cerebral small vessel disease (CSVD), but remain largely undetected on conventional MRI. We aimed to evaluate (1) imaging criteria for the detection of small infarcts in the caudate nucleus on 7T MRI, (2) intra- and inter-rater agreement, (3) frequency and (4) detection rate on 7T versus 1.5T MRI. In 90 patients (68 ± 8 years) with a history of vascular disease from the SMART-MR study, we defined 7T imaging criteria for cavitated and non-cavitated small infarcts in the caudate nucleus...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28432747/whole-body-adipose-tissue-and-lean-muscle-volumes-and-their-distribution-across-gender-and-age-mr-derived-normative-values-in-a-normal-weight-swiss-population
#10
Erika J Ulbrich, Daniel Nanz, Olof Dahlqvist Leinhard, Magda Marcon, Michael A Fischer
PURPOSE: To determine age- and gender-dependent whole-body adipose tissue and muscle volumes in healthy Swiss volunteers in Dixon MRI in comparison with anthropometric and bioelectrical impedance (BIA) measurements. METHODS: Fat-water-separated whole-body 3 Tesla MRI of 80 healthy volunteers (ages 20 to 62 years) with a body mass index (BMI) of 17.5 to 26.2 kg/m(2) (10 men, 10 women per decade). Age and gender-dependent volumes of total adipose tissue (TAT), visceral adipose tissue (VAT), total abdominal subcutaneous adipose tissue (ASAT) and total abdominal adipose tissue (TAAT), and the total lean muscle tissue (TLMT) normalized for body height were determined by semi-automatic segmentation, and correlated with anthropometric and BIA measurements as well as lifestyle parameters...
April 22, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28432505/3d-double-echo-steady-state-sequence-assessment-of-hip-joint-cartilage-and-labrum-at-3-tesla-comparative-analysis-of-magnetic-resonance-imaging-and-intraoperative-data
#11
Christoph Schleich, Tobias Hesper, Harish S Hosalkar, Fanni Rettegi, Christoph Zilkens, Rüdiger Krauspe, Gerald Antoch, Bernd Bittersohl
OBJECTIVES: To assess the diagnostic accuracy of a high-resolution, three-dimensional (3D) double-echo steady-state (DESS) sequence with radial imaging at 3 Tesla (T) for evaluating cartilage and labral alterations in the hip. METHODS: Magnetic resonance imaging (MRI) data obtained at 3 T, including radially reformatted DESS images and intraoperative data of 45 patients (mean age 42 ± 13.7 years) who underwent hip arthroscopy, were compared. The acetabular cartilage and labrum of the upper hemisphere of the acetabulum and the central femoral head cartilage were evaluated...
April 21, 2017: European Radiology
https://www.readbyqxmd.com/read/28431605/global-brain-atrophy-and-metabolic-dysfunction-in-lgi1-encephalitis-a-prospective-multimodal-mri-study
#12
Monika Szots, Morten Blaabjerg, Gergely Orsi, Pernille Iversen, Daniel Kondziella, Camilla G Madsen, Ellen Garde, Peter O Magnusson, Peter Barsi, Ferenc Nagy, Hartwig R Siebner, Zsolt Illes
BACKGROUND: Chronic cognitive deficits are frequent in leucin-rich glioma-inactivated 1 protein (LGI1) encephalitis. We examined structural and metabolic brain abnormalities following LGI1 encephalitis and correlated findings with acute and follow-up clinical outcomes. METHODS: Nine patients underwent prospective multimodal 3 Tesla MRI 33.1±18months after disease onset, including automated volumetry, diffusion tensor imaging (DTI) and magnetic resonance spectroscopy (MRS)...
May 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28430290/frequency-and-topography-of-small-cerebrovascular-lesions-in-vascular-and-in-mixed-dementia-a-post-mortem-7-tesla-magnetic-resonance-imaging-study-with-neuropathological-correlates
#13
Jacques De Reuck, Florent Auger, Nicolas Durieux, Vincent Deramecourt, Claude-Alain Maurage, Charlotte Cordonnier, Florence Pasquier, Didier Leys, Regis Bordet
<i><b>Introduction</b>: Mixed dementia (MixD) refers to a combination of definite Alzheimer's disease (AD) and vascular encephalopathy. The existence of a "pure" type of vascular dementia (VaD) is controversial. There is a need to find magnetic resonance imaging (MRI) characteristics allowing the distinction between VaD and MixD. The present post-mortem 7.0-tesla MRI compares the frequency or severity and the topography of the small cerebrovascular lesions in brains of patients with VaD and with MixD...
2017: Folia Neuropathologica
https://www.readbyqxmd.com/read/28420598/1-5-t-augmented-reality-navigated-interventional-mri-paravertebral-sympathetic-plexus-injections
#14
David R Marker, Paweena U Thainual, Tamas Ungi, Aaron J Flammang, Gabor Fichtinger, Iulian I Iordachita, John A Carrino, Jan Fritz
PURPOSE: The high contrast resolution and absent ionizing radiation of interventional magnetic resonance imaging (MRI) can be advantageous for paravertebral sympathetic nerve plexus injections. We assessed the feasibility and technical performance of MRI-guided paravertebral sympathetic injections utilizing augmented reality navigation and 1.5 T MRI scanner. METHODS: A total of 23 bilateral injections of the thoracic (8/23, 35%), lumbar (8/23, 35%), and hypogastric (7/23, 30%) paravertebral sympathetic plexus were prospectively planned in twelve human cadavers using a 1...
May 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28416453/high-resolution-data-analysis-strategies-for-mesoscale-human-functional-mri-at-7-and-9-4t
#15
Valentin G Kemper, Federico De Martino, Thomas C Emmerling, Essa Yacoub, Rainer Goebel
The advent of ultra-high field functional magnetic resonance imaging (fMRI) has greatly facilitated submillimeter resolution acquisitions (voxel volume below (1mm³)), allowing the investigation of cortical columns and cortical depth dependent (i.e. laminar) structures in the human brain. Advanced data analysis techniques are essential to exploit the information in high resolution functional measures. In this article, we use recent, exemplary 9.4T human functional and anatomical data to review the advantages and disadvantages of (1) pooling high resolution data across regions of interest for cortical depth profile analysis, (2) pooling across cortical depths for mapping patches of cortex while discarding depth-dependent (i...
April 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28394080/parallel-transmit-capability-of-various-rf-transmit-elements-and-arrays-at-7t-mri
#16
Stefan H G Rietsch, Stephan Orzada, Andreas K Bitz, Marcel Gratz, Mark E Ladd, Harald H Quick
PURPOSE: In this work, 22 configurations for remote radiofrequency (RF) coil arrays consisting of different transmit element designs for 7 Tesla (T) ultrahigh-field MRI are compared by numerical simulations. METHODS: Investigated transmit RF element types are rectangular loops, micro striplines, micro striplines with meanders, 250-mm shielded dipoles with meanders, and lambda over two dipoles with and without shield. These elements are combined in four different configurations of circumferential RF body arrays with four or eight transmit elements each...
April 10, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28368659/after-over-200-years-7-t-magnetic-resonance-imaging-reveals-the-foliate-structure-of-the-human-corpus-callosum-in-vivo
#17
Christopher J Wiggins, Andreas Schäfer, Bibek Dhital, Denis Le Bihan, Robert Turner
OBJECTIVE: A fine structure of the corpus callosum (CC), consisting of radial lines, is seen in historical anatomical atlases as far back as that of Vicq d'Azyr (1786). This study examines a similar pattern observed in vivo using high-resolution MR images at 7 T. METHODS: 8 healthy subjects were examined with 7.0-T MRI. Anatomical images were collected with a gradient echo scan with 0.5-mm isotropic resolution, which were rated for visibility of the radial pattern...
May 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28360954/impact-of-preoperative-and-postoperative-membranous-urethral-length-measured-by-3-tesla-magnetic-resonance-imaging-on-urinary-continence-recovery-after-robotic-assisted-radical-prostatectomy
#18
Wan Song, Chan Kyo Kim, Byung Kwan Park, Hwang Gyun Jeon, Byong Chang Jeong, Seong Il Seo, Seong Soo Jeon, Han Yong Choi, Hyun Moo Lee
INTRODUCTION: We sought to investigate the impact of preoperative and postoperative membranous urethral length (MUL) on urinary continence using 3 Tesla (3T) magnetic resonance imaging (MRI) after robotic-assisted radical prostatectomy (RARP). METHODS: Between 2008 and 2013, 190 men with RARP underwent preoperative and postoperative MRI. Patients who received adjuvant radiotherapy or who were lost to followup were excluded, leaving 186 patients eligible for analysis...
March 2017: Canadian Urological Association Journal, Journal de L'Association des Urologues du Canada
https://www.readbyqxmd.com/read/28359293/memory-performance-related-dynamic-brain-connectivity-indicates-pathological-burden-and-genetic-risk-for-alzheimer-s-disease
#19
Frances C Quevenco, Maria G Preti, Jiri M G van Bergen, Jun Hua, Michael Wyss, Xu Li, Simon J Schreiner, Stefanie C Steininger, Rafael Meyer, Irene B Meier, Adam M Brickman, Sandra E Leh, Anton F Gietl, Alfred Buck, Roger M Nitsch, Klaas P Pruessmann, Peter C M van Zijl, Christoph Hock, Dimitri Van De Ville, Paul G Unschuld
BACKGROUND: The incidence of Alzheimer's disease (AD) strongly relates to advanced age and progressive deposition of cerebral amyloid-beta (Aβ), hyperphosphorylated tau, and iron. The purpose of this study was to investigate the relationship between cerebral dynamic functional connectivity and variability of long-term cognitive performance in healthy, elderly subjects, allowing for local pathology and genetic risk. METHODS: Thirty seven participants (mean (SD) age 74 (6...
March 31, 2017: Alzheimer's Research & Therapy
https://www.readbyqxmd.com/read/28356290/novel-contrast-mixture-improves-bladder-wall-contrast-for-visualizing-bladder-injury
#20
Pradeep Tyagi, Joseph J Janicki, T Kevin Hitchens, Lesley M Foley, Mahendra Kashyap, Naoki Yoshimura, Jonathan Kaufman
PURPOSE: Here, we tested whether combined contrast-enhanced magnetic resonance imaging (CCE-MRI), using a mixture Gadolinium and iron-oxide based contrast agents, can segment the bladder wall from the bladder lumen. CCE-MRI relies on the differences in particle size and contrast mechanisms of two agents for improved image contrast. METHODS: Under isoflurane anesthesia, T1-weighted imaging of adult female Sprague-Dawley rat bladder was performed using standard turbo spin echo sequences at 7 Tesla, before and after transurethral instillation of 0...
March 29, 2017: American Journal of Physiology. Renal Physiology
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