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high resolution magnetic resonance imaging

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https://www.readbyqxmd.com/read/28211804/comparison-of-elastography-based-on-transvaginal-ultrasound-and-mri-in-assessing-parametrial-invasion-of-cervical-cancer
#1
Xi Ma, Qi Li, Jian-Liang Wang, Jun Shao, Yu-Chun Zhu, Wei Ding, Hou-Sheng Zhang, Hong-Yan Wang, Jun-Kang Shen
OBJECTIVE: The purpose of this study was to evaluate the clinical value of transvaginal elastography (TVES) combined with high-resolution transvaginal ultrasound (TVS) in the detection of parametrial invasion in cervical cancer and to compare the diagnostic performance with magnetic resonance imaging (MRI). MATERIALS AND METHODS: 52 women with histologically confirmed cervical cancer over a 2-year period were staged using International Federation of Gynecology and Obstetrics (FIGO) criteria and underwent MRI and TVES combined with TVS according to a standardized protocol before treatment...
February 17, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28211591/magnetic-resonance-imaging-of-the-knee-an-overview-and-update-of-conventional-and-state-of-the-art-imaging
#2
Nicholas C Nacey, Matthew G Geeslin, Grady Wilson Miller, Jennifer L Pierce
: Magnetic resonance imaging (MRI) has become the preferred modality for imaging the knee to show pathology and guide patient management and treatment. The knee is one of the most frequently injured joints, and knee pain is a pervasive difficulty that can affect all age groups. Due to the diverse pathology, complex anatomy, and a myriad of injury mechanisms of the knee, the MRI knee protocol and sequences should ensure detection of both soft tissue and osseous structures in detail and with accuracy...
February 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28205251/multishot-echo-planar-mreit-for-fast-imaging-of-conductivity-current-density-and-electric-field-distributions
#3
Munish Chauhan, Rohini Vidya Shankar, Neeta Ashok Kumar, Vikram D Kodibagkar, Rosalind Sadleir
PURPOSE: Magnetic resonance electrical impedance tomography (MREIT) sequences typically use conventional spin or gradient echo-based acquisition methods for reconstruction of conductivity and current density maps. Use of MREIT in functional and electroporation studies requires higher temporal resolution and faster sequences. Here, single and multishot echo planar imaging (EPI) based MREIT sequences were evaluated to see whether high-quality MREIT phase data could be obtained for rapid reconstruction of current density, conductivity, and electric fields...
February 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28203206/mild-and-short-term-caloric-restriction-prevents-obesity-induced-cardiomyopathy-in-young-zucker-rats-without-changing-in-metabolites-and-fatty-acids-cardiac-profile
#4
Gema Ruiz-Hurtado, Concha F García-Prieto, Helena Pulido-Olmo, Juan P Velasco-Martín, Palmira Villa-Valverde, María E Fernández-Valle, Lisardo Boscá, María Fernández-Velasco, Javier Regadera, Beatriz Somoza, María S Fernández-Alfonso
Caloric restriction (CR) ameliorates cardiac dysfunction associated with obesity. However, most of the studies have been performed under severe CR (30-65% caloric intake decrease) for several months or even years in aged animals. Here, we investigated whether mild (20% food intake reduction) and short-term (2-weeks) CR prevented the obese cardiomyopathy phenotype and improved the metabolic profile of young (14 weeks of age) genetically obese Zucker fa/fa rats. Heart weight (HW) and HW/tibia length ratio was significantly lower in fa/fa rats after 2 weeks of CR than in counterparts fed ad libitum...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28202527/-18f-2s-4r-4-fluoroglutamine-pet-detects-glutamine-pool-size-changes-in-triple-negative-breast-cancer-in-response-to-glutaminase-inhibition
#5
Rong Zhou, Austin R Pantel, Shihong Li, Brian P Lieberman, Karl Ploessl, Hoon Choi, Eric Blankemeyer, Hsiaoju Lee, Hank Kung, Robert H Mach, David Mankoff
Glutaminolysis is a metabolic pathway adapted by many aggressive cancers, including triple-negative breast cancers (TNBC), to utilize glutamine for survival and growth. In this study, we examined the utility of [18F](2S,4R)4-fluoroglutamine ([18F]4F-Gln) PET to measure tumor cellular glutamine pool size, whose change might reveal the pharmacodynamic (PD) effect of drugs targeting this cancer-specific metabolic pathway. High glutaminase (GLS) activity in TNBC tumors resulted in low cellular glutamine pool size assayed via high-resolution 1H magnetic resonance spectroscopy (MRS)...
February 15, 2017: Cancer Research
https://www.readbyqxmd.com/read/28197066/patch-based-super-resolution-of-mr-spectroscopic-images-application-to-multiple-sclerosis
#6
Saurabh Jain, Diana M Sima, Faezeh Sanaei Nezhad, Gilbert Hangel, Wolfgang Bogner, Stephen Williams, Sabine Van Huffel, Frederik Maes, Dirk Smeets
Purpose: Magnetic resonance spectroscopic imaging (MRSI) provides complementary information to conventional magnetic resonance imaging. Acquiring high resolution MRSI is time consuming and requires complex reconstruction techniques. Methods: In this paper, a patch-based super-resolution method is presented to increase the spatial resolution of metabolite maps computed from MRSI. The proposed method uses high resolution anatomical MR images (T1-weighted and Fluid-attenuated inversion recovery) to regularize the super-resolution process...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28196474/biodegradable-magnesium-herbert-screw-image-quality-and-artifacts-with-radiography-ct-and-mri
#7
Lena Sonnow, Sören Könneker, Peter M Vogt, Frank Wacker, Christian von Falck
BACKGROUND: Magnesium alloys have recently been rediscovered as biodegradable implants in musculoskeletal surgery. This study is an ex-vivo trial to evaluate the imaging characteristics of magnesium implants in different imaging modalities as compared to conventional metallic implants. METHODS: A CE-approved magnesium Herbert screw (MAGNEZIX®) and a titanium screw of the same dimensions (3.2x20 mm) were imaged using different modalities: digital radiography (DX), multidetector computed tomography (MDCT), high resolution flat panel CT (FPCT) and magnetic resonance imaging (MRI)...
February 14, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28192457/time-varying-spectral-power-of-resting-state-fmri-networks-reveal-cross-frequency-dependence-in-dynamic-connectivity
#8
Maziar Yaesoubi, Robyn L Miller, Vince D Calhoun
Brain oscillations and synchronicity among brain regions (brain connectivity) have been studied in resting-state (RS) and task-induced settings. RS-connectivity which captures brain functional integration during an unconstrained state is shown to vary with the frequency of oscillations. Indeed, high temporal resolution modalities have demonstrated both between and cross-frequency connectivity spanning across frequency bands such as theta and gamma. Despite high spatial resolution, functional magnetic resonance imaging (fMRI) suffers from low temporal resolution due to modulation with slow-varying hemodynamic response function (HRF) and also relatively low sampling rate...
2017: PloS One
https://www.readbyqxmd.com/read/28191681/a-time-efficient-acquisition-protocol-for-multipurpose-diffusion-weighted-microstructural-imaging-at-7-tesla
#9
Farshid Sepehrband, Kieran O'Brien, Markus Barth
PURPOSE: Several diffusion-weighted MRI techniques have been developed and validated during the past 2 decades. While offering various neuroanatomical inferences, these techniques differ in their proposed optimal acquisition design, preventing clinicians and researchers benefiting from all potential inference methods, particularly when limited time is available. This study reports an optimal design that enables for a time-efficient diffusion-weighted MRI acquisition scheme at 7 Tesla...
February 12, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28188659/hippocampal-subfields-at-ultra-high-field-mri-an-overview-of-segmentation-and-measurement-methods
#10
Alessia Giuliano, Graziella Donatelli, Mirco Cosottini, Michela Tosetti, Alessandra Retico, Maria Evelina Fantacci
The hippocampus is one of the most interesting and studied brain regions because of its involvement in memory functions and its vulnerability in pathological conditions, such as neurodegenerative processes. In the recent years, the increasing availability of Magnetic Resonance Imaging (MRI) scanners that operate at ultra-high field (UHF), i.e. with static magnetic field strength ≥ 7T, has opened new research perspectives. Compared to conventional high-field scanners, these systems can provide new contrasts, increased signal-to-noise ratio and higher spatial resolution, thus they may improve the visualization of very small structures of the brain, such as the hippocampal subfields...
February 11, 2017: Hippocampus
https://www.readbyqxmd.com/read/28188346/-clinical-indications-for-high-resolution-mri-diagnostics-of-the-peripheral-nervous-system
#11
T Godel, M Weiler
CLINICAL/METHODICAL ISSUE: Peripheral neuropathies are common and diagnostically often challenging disorders. Difficulties particularly exist in lesion localization and recognition of complex spatial lesion patterns. STANDARD DIAGNOSTIC METHODS: Medical history taking, neurological examination, neurophysiological tests and nerve ultrasonography represent the gold standard in the diagnosis of peripheral nerve lesions but have known methodical limitations. METHODICAL INNOVATIONS: The use of 3 Tesla magnetic resonance neurography (MRN) is an additional diagnostic imaging tool recently developed for the high-resolution visualization of long segments of peripheral nerves...
February 10, 2017: Der Radiologe
https://www.readbyqxmd.com/read/28186656/phenotype-and-genotype-specific-structural-alterations-in-spasmodic-dysphonia
#12
Serena Bianchi, Giovanni Battistella, Hailey Huddleston, Rebecca Scharf, Lazar Fleysher, Anna F Rumbach, Steven J Frucht, Andrew Blitzer, Laurie J Ozelius, Kristina Simonyan
BACKGROUND: Spasmodic dysphonia is a focal dystonia characterized by involuntary spasms in the laryngeal muscles that occur selectively during speaking. Although hereditary trends have been reported in up to 16% of patients, the causative etiology of spasmodic dysphonia is unclear, and the influences of various phenotypes and genotypes on disorder pathophysiology are poorly understood. In this study, we examined structural alterations in cortical gray matter and white matter integrity in relationship to different phenotypes and putative genotypes of spasmodic dysphonia to elucidate the structural component of its complex pathophysiology...
February 10, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28185713/effects-of-pitavastatin-on-lipid-rich-carotid-plaques-studied-using-high-resolution-magnetic-resonance-imaging
#13
Tao Feng, Xiaoxing Huang, Qundi Liang, Yun Liang, Yong Yuan, Li Feng, Wenjun Wu, Xuehong Xiao, Ying Han
PURPOSE: This study evaluates the effectiveness of pitavastatin in patients with atherosclerosis. METHODS: Sixty patients with atherosclerosis with lipid-rich carotid plaques were included and allocated into low-dose (2 mg/d) and high-dose (4 mg/d) pitavastatin groups with 48 weeks of treatment. Total cholesterol, LDL-C, HDL-C, triglycerides, apolipoprotein A1, apolipoprotein B, lipoprotein (a), and the inflammation-related factors interleukin 6, high-sensitivity C-reactive protein, and homocysteine were determined...
February 6, 2017: Clinical Therapeutics
https://www.readbyqxmd.com/read/28185303/interchangeable-neck-shape-specific-coils-for-a-clinically-realizable-anterior-neck-phased-array-system
#14
Michael J Beck, Dennis L Parker, Bradley D Bolster, Seong-Eun Kim, J Scott McNally, Gerald S Treiman, J Rock Hadley
PURPOSE: To demonstrate the interchangeable neck shape-specific (NSS) coil concept that supplements standard commercial spine and head/neck coils to provide simultaneous high-resolution (hi-res) head/neck imaging with high signal-to-noise ratio (SNR). METHODS: Two NSS coils were constructed on formers designed to fit two different neck shapes. A 7-channel (7ch) ladder array was constructed on a medium neck former, and a 9-channel (9ch) ladder array was constructed on large neck former...
February 10, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28183529/hippocampal-thinning-linked-to-longer-tomm40-poly-t-variant-lengths-in-the-absence-of-the-apoe-%C3%AE%C2%B54-variant
#15
Alison C Burggren, Zanjbeel Mahmood, Theresa M Harrison, Prabha Siddarth, Karen Miller, Gary Small, David A Merrill, Susan Bookheimer
INTRODUCTION: The translocase of outer mitochondrial membrane 40 (TOMM40), which lies in linkage disequilibrium with apolipoprotein E (APOE), has received attention more recently as a promising gene in Alzheimer's disease (AD) risk. TOMM40 influences AD pathology through mitochondrial neurotoxicity, and the medial temporal lobe (MTL) is the most likely brain region for identifying early manifestations of AD-related morphology changes. METHODS: In this study, we examined the effects of TOMM40 using high-resolution magnetic resonance imaging in 65 healthy, older subjects with and without the APOE ε4 AD-risk variant...
February 6, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28183320/real-time-phase-contrast-flow-cardiovascular-magnetic-resonance-with-low-rank-modeling-and-parallel-imaging
#16
Aiqi Sun, Bo Zhao, Yunduo Li, Qiong He, Rui Li, Chun Yuan
BACKGROUND: Conventional phase-contrast cardiovascular magnetic resonance (PC-CMR) employs cine-based acquisitions to assess blood flow condition, in which electro-cardiogram (ECG) gating and respiration control are generally required. This often results in lower acquisition efficiency, and limited utility in the presence of cardiovascular pathology (e.g., cardiac arrhythmia). Real-time PC-CMR, without ECG gating and respiration control, is a promising alternative that could overcome limitations of the conventional approach...
February 10, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28175932/-nerve-injuries-and-traumatic-lesions-of-the-brachial-plexus-imaging-diagnostics-and-therapeutic-options
#17
D Schwarz, M T Pedro, C Brand, M Bendszus, G Antoniadis
CLINICAL/METHODICAL ISSUE: Traumatic lesions of peripheral nerves and the brachial plexus are feared complications because they frequently result in severe functional impairment. The prognosis is greatly dependent on the correct early diagnosis and the right choice of treatment regimen. It is important to distinguish between open and closed injuries. STANDARD RADIOLOGICAL METHODS: Initial imaging must critically evaluate or prove nerve continuity and is commonly achieved by high-resolution ultrasonography...
February 7, 2017: Der Radiologe
https://www.readbyqxmd.com/read/28175514/356%C3%A2-microsurgical-anatomy-of-the-brainstem-safe-entry-zones-a-cadaveric-study-with-high-resolution-magnetic-resonance-imaging-and-fiber-tracking
#18
Debraj Mukherjee, Veysel Antar, Bora Gurer, Ulas Cikla, Gabriel Neves, Mehmet Ekici, Tomer Hananya, Aaron S Field, Shahriar M Salamat, Mustafa Kemal Baskaya
No abstract text is available yet for this article.
August 1, 2016: Neurosurgery
https://www.readbyqxmd.com/read/28175498/308%C3%A2-high-resolution-magnetic-resonance-imaging-findings-following-trigeminal-rhizotomy
#19
C Rory Goodwin, Benjamin Northcutt, Daniel Seeburg, Jaehoon Shin, Debebe Theodros, Nancy A Abu-Bonsrah, Daniel Herzka, Nafi Aygun, Ari M Blitz, Michael Lim
No abstract text is available yet for this article.
August 1, 2016: Neurosurgery
https://www.readbyqxmd.com/read/28175460/196%C3%A2-high-resolution-magnetic-resonance-imaging-in-trigeminal-neuralgia-added-benefit-of-contrast-enhanced-constructive-interference-in-steady-state-imaging
#20
C Rory Goodwin, Daniel Seeburg, Benjamin Northcutt, Jaehoon Shin, Debebe Theodros, Nancy A Abu-Bonsrah, Daniel Herzka, Nafi Aygun, Ari M Blitz, Michael Lim
No abstract text is available yet for this article.
August 1, 2016: Neurosurgery
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