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high resolution magnetic resonance imaging

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https://www.readbyqxmd.com/read/28329054/whole-heart-detailed-and-quantitative-anatomy-myofibre-structure-and-vasculature-from-x-ray-phase-contrast-synchrotron-radiation-based-micro-computed-tomography
#1
Anna Gonzalez-Tendero, Chong Zhang, Vedrana Balicevic, Rubén Cárdenes, Sven Loncaric, Constantine Butakoff, Bruno Paun, Anne Bonnin, Patricia Garcia-Cañadilla, Emma Muñoz-Moreno, Eduard Gratacós, Fatima Crispi, Bart Bijnens
Background: While individual cardiac myocytes only have a limited ability to shorten, the heart efficiently pumps a large volume-fraction thanks to a cell organization in a complex 3D fibre structure. Subclinical subtle cardiac structural remodelling is often present before symptoms arise. Understanding and early detection of these subtle changes is crucial for diagnosis and prevention. Additionally, personalized computational modelling requires knowledge on the multi-scale structure of the whole heart and vessels...
March 15, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28328939/multimodal-mr-imaging-reveals-large-scale-structural-and-functional-connectivity-changes-in-profound-early-blindness
#2
Corinna M Bauer, Gabriella V Hirsch, Lauren Zajac, Bang-Bon Koo, Olivier Collignon, Lotfi B Merabet
In the setting of profound ocular blindness, numerous lines of evidence demonstrate the existence of dramatic anatomical and functional changes within the brain. However, previous studies based on a variety of distinct measures have often provided inconsistent findings. To help reconcile this issue, we used a multimodal magnetic resonance (MR)-based imaging approach to provide complementary structural and functional information regarding this neuroplastic reorganization. This included gray matter structural morphometry, high angular resolution diffusion imaging (HARDI) of white matter connectivity and integrity, and resting state functional connectivity MRI (rsfcMRI) analysis...
2017: PloS One
https://www.readbyqxmd.com/read/28328530/imaging-methods-for-bone-mass-evaluation-during-childhood-and-adolescence-an-update
#3
Isabela Leite Pezzuti, Adriana Maria Kakehasi, Maria Tereza Filgueiras, Juliana Albano de Guimarães, Isabela Alves Campos de Lacerda, Ivani Novato Silva
The objective of the work was to prepare an update on imaging methods for bone evaluation during childhood and adolescence. The text was based on original and review articles on imaging methods for clinical evaluation of bone mass in children and adolescents up to 20 years old. They were selected from BIREME and PUBMED by means of the following keywords: bone density; osteoporosis/diagnosis; densitometry; tomography; ultrasonography; magnetic resonance imaging; and radiogrammetry and published in Portuguese or English, in the last 10 years (2006-2016)...
March 22, 2017: Journal of Pediatric Endocrinology & Metabolism: JPEM
https://www.readbyqxmd.com/read/28324983/the-precuneus-may-encode-irrationality-in-human-gambling
#4
P Sacre, M S D Kerr, S Subramanian, K Kahn, J Gonzalez-Martinez, M A Johnson, S V Sarma, J T Gale
Humans often make irrational decisions, especially psychiatric patients who have dysfunctional cognitive and emotional circuitry. Understanding the neural basis of decision-making is therefore essential towards patient management, yet current studies suffer from several limitations. Functional magnetic resonance imaging (fMRI) studies in humans have dominated decision-making neuroscience, but have poor temporal resolution and the blood oxygenation level-dependent signal is only a proxy for neural activity. On the other hand, lesion studies in humans used to infer functionality in decision-making lack characterization of neural activity altogether...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324693/cortical-complexity-in-bipolar-disorder-applying-a-spherical-harmonics-approach
#5
Igor Nenadic, Rachel A Yotter, Maren Dietzek, Kerstin Langbein, Heinrich Sauer, Christian Gaser
Recent studies using surface-based morphometry of structural magnetic resonance imaging data have suggested that some changes in bipolar disorder (BP) might be neurodevelopmental in origin. We applied a novel analysis of cortical complexity based on fractal dimensions in high-resolution structural MRI scans of 18 bipolar disorder patients and 26 healthy controls. Our region-of-interest based analysis revealed increases in fractal dimensions (in patients relative to controls) in left lateral orbitofrontal cortex and right precuneus, and decreases in right caudal middle frontal, entorhinal cortex, and right pars orbitalis, and left fusiform and posterior cingulate cortices...
February 21, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28321915/acceleration-of-asl-based-time-resolved-mr-angiography-by-acquisition-of-control-and-labeled-images-in-the-same-shot-actress
#6
Yuriko Suzuki, Noriyuki Fujima, Tetsuo Ogino, James Alastair Meakin, Akira Suwa, Hiroyuki Sugimori, Marc Van Cauteren, Matthias J P van Osch
PURPOSE: Noncontrast 4D-MR-angiography (MRA) using arterial spin labeling (ASL) is beneficial because high spatial and temporal resolution can be achieved. However, ASL requires acquisition of labeled and control images for each phase. The purpose of this study is to present a new accelerated 4D-MRA approach that requires only a single control acquisition, achieving similar image quality in approximately half the scan time. METHODS: In a multi-phase Look-Locker sequence, the first phase was used as the control image and the labeling pulse was applied before the second phase...
March 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28321908/reduced-field-of-view-single-shot-spiral-perfusion-imaging
#7
Yang Yang, Li Zhao, Xiao Chen, Peter W Shaw, Jorge A Gonzalez, Frederick H Epstein, Craig H Meyer, Christopher M Kramer, Michael Salerno
PURPOSE: To develop a single-shot spiral perfusion pulse sequence with outer-volume suppression (OVS) to achieve whole-heart coverage with a short temporal footprint of 10 ms per slice location. METHODS: A highly accelerated single-shot variable density spiral pulse sequence with an integrated OVS module for reduced field of view (rFOV) perfusion imaging with 2 mm spatial resolution was developed and evaluated in simulations, phantom experiments and in clinical patients with (n = 8) or without (n = 8) OVS...
March 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28321904/rotating-single-shot-acquisition-rosa-with-composite-reconstruction-for-fast-high-resolution-diffusion-imaging
#8
Qiuting Wen, Chandana Kodiweera, Brian M Dale, Giri Shivraman, Yu-Chien Wu
PURPOSE: To accelerate high-resolution diffusion imaging, rotating single-shot acquisition (RoSA) with composite reconstruction is proposed. Acceleration was achieved by acquiring only one rotating single-shot blade per diffusion direction, and high-resolution diffusion-weighted (DW) images were reconstructed by using similarities of neighboring DW images. A parallel imaging technique was implemented in RoSA to further improve the image quality and acquisition speed. RoSA performance was evaluated by simulation and human experiments...
March 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28321484/rhabdomyolysis-resulting-in-concurrent-horner-s-syndrome-and-brachial-plexopathy-a-case-report
#9
Susan C Lee, Christian Geannette, Scott W Wolfe, Joseph H Feinberg, Darryl B Sneag
This case report describes a 29-year-old male who presented with immediate onset of Horner's syndrome and ipsilateral brachial plexopathy after sleeping with his arm dangling outside a car window for 8 h. Outside workup and imaging revealed rhabdomyolysis of the left neck musculature. Subsequent electrodiagnostic testing and high-resolution brachial plexus magnetic resonance imaging at the authors' institution attributed the Horner's syndrome and concurrent brachial plexopathy to rhabdomyolysis of the longus colli and scalene musculature, which had compressed-and consequently scar tethered-the cervical sympathetic trunk and brachial plexus...
March 20, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28320412/high-resolution-hemodynamic-profiling-of-murine-arteriovenous-fistula-using-magnetic-resonance-imaging-and-computational-fluid-dynamics
#10
Daniel Pike, Yan-Ting Shiu, Maheshika Somarathna, Lingling Guo, Tatyana Isayeva, John Totenhagen, Timmy Lee
BACKGROUND: Arteriovenous fistula (AVF) maturation failure remains a major cause of morbidity and mortality in hemodialysis patients. The two major etiologies of AVF maturation failure are early neointimal hyperplasia development and persistent inadequate outward remodeling. Although hemodynamic changes following AVF creation may impact AVF remodeling and contribute to neointimal hyperplasia development and impaired outward remodeling, detailed AVF hemodynamics are not yet fully known...
March 20, 2017: Theoretical Biology & Medical Modelling
https://www.readbyqxmd.com/read/28319176/insight-into-the-mechanism-of-action-of-temporin-sha-a-new-broad-spectrum-antiparasitic-and-antibacterial-agent
#11
Zahid Raja, Sonia André, Feten Abbassi, Vincent Humblot, Olivier Lequin, Tahar Bouceba, Isabelle Correia, Sandra Casale, Thierry Foulon, Denis Sereno, Bruno Oury, Ali Ladram
Antimicrobial peptides (AMPs) are promising drugs to kill resistant pathogens. In contrast to bacteria, protozoan parasites, such as Leishmania, were little studied. Therefore, the antiparasitic mechanism of AMPs is still unclear. In this study, we sought to get further insight into this mechanism by focusing our attention on temporin-SHa (SHa), a small broad-spectrum AMP previously shown to be active against Leishmania infantum. To improve activity, we designed analogs of SHa and compared the antibacterial and antiparasitic mechanisms...
2017: PloS One
https://www.readbyqxmd.com/read/28317892/ultra-wide-range-field-dependent-measurements-of-the-relaxivity-of-gd1-xeuxvo4-nanoparticle-contrast-agents-using-a-mechanical-sample-shuttling-relaxometer
#12
Ching-Yu Chou, Mouna Abdesselem, Cedric Bouzigues, Minglee Chu, Angelo Guiga, Tai-Huang Huang, Fabien Ferrage, Thierry Gacoin, Antigoni Alexandrou, Dimitris Sakellariou
The current trend for Magnetic Resonance Imaging points towards higher magnetic fields. Even though sensitivity and resolution are increased in stronger fields, T1 contrast is often reduced, and this represents a challenge for contrast agent design. Field-dependent measurements of relaxivity are thus important to characterize contrast agents. At present, the field-dependent curves of relaxivity are usually carried out in the field range of 0 T to 2 T, using fast field cycling relaxometers. Here, we employ a high-speed sample shuttling device to switch the magnetic fields experienced by the nuclei between virtually zero field, and the center of any commercial spectrometer...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28316225/-the-clinical-impact-of-artery-first-approach-combined-with-vascular-resection-and-reconstruction-in-the-treatment-of-pancreatic-head-carcinoma
#13
J L Huang, W G Li, F Z Chen, Z J Su, F M Li, B Liu
Objective: To evaluate the application of artery first, combined vascular resection and reconstruction in the treatment of pancreatic head carcinoma. Methods: The clinical data of 13 patients with pancreatic head cancer were retrospectively analyzed from February 2014 to March 2016 in the Affiliated Hospital of Xiamen University. Preoperative computed tomography of high resolution layer or magnetic resonance imaging examination demonstrated pancreatic head carcinoma, as well as close adhesion, stenosis, compression or displacement of superior mesenteric vein or portal vein wall...
March 23, 2017: Zhonghua Zhong Liu za Zhi [Chinese Journal of Oncology]
https://www.readbyqxmd.com/read/28315866/cerebrospinal-fluid-and-parenchymal-brain-development-and-growth-in-the-healthy-fetus
#14
Nickie N Andescavage, Adre DuPlessis, Robert McCarter, Gilbert Vezina, Richard Robertson, Catherine Limperopoulos
OBJECTIVE: The objective of this study was to apply quantitative magnetic resonance imaging to characterize absolute cerebrospinal fluid (CSF) development, as well as its relative development to fetal brain parenchyma in the healthy human fetus. DESIGN: We created three-dimensional high-resolution reconstructions of the developing brain for healthy fetuses between 18 and 40 weeks' gestation, segmented the parenchymal and CSF spaces, and calculated the volumes for the lateral, third, and fourth ventricles; extra-axial CSF space; and the cerebrum, cerebellum, and brainstem...
March 18, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28314241/characterizing-articulation-in-apraxic-speech-using-real-time-magnetic-resonance-imaging
#15
Christina Hagedorn, Michael Proctor, Louis Goldstein, Stephen M Wilson, Bruce Miller, Maria Luisa Gorno-Tempini, Shrikanth S Narayanan
Purpose: Real-time magnetic resonance imaging (MRI) and accompanying analytical methods are shown to capture and quantify salient aspects of apraxic speech, substantiating and expanding upon evidence provided by clinical observation and acoustic and kinematic data. Analysis of apraxic speech errors within a dynamic systems framework is provided and the nature of pathomechanisms of apraxic speech discussed. Method: One adult male speaker with apraxia of speech was imaged using real-time MRI while producing spontaneous speech, repeated naming tasks, and self-paced repetition of word pairs designed to elicit speech errors...
March 17, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28306651/predicting-auditory-outcomes-from-radiological-imaging-in-cochlear-implant-patients-with-cochlear-nerve-deficiency
#16
Xingmei Wei, Yongxin Li, Biao Chen, Yue Gong, Qian-Jie Fu, Ting Liu, Danmo Cui, Qiaotong Su, Ying Shi
OBJECTIVE: To compare imaging and outcome data in cochlear implant (CI) patients with and without cochlear nerve deficiency (CND). STUDY DESIGN: Retrospective study comparing presurgical imaging (via high-resolution computed tomography and three-dimensional magnetic resonance imaging) to postsurgical auditory outcomes in CI patients with and without CND. PATIENTS: Forty-three CI patients with CND diagnosed according to preoperative imaging were included in the CND group...
March 16, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28304220/high-resolution-magnetic-resonance-imaging-of-carotid-atherosclerotic-plaques-a-correlation-study-with-histopathology
#17
Zhangyong Xia, Hua Yang, Xiaochun Yuan, Jiyue Wang, Shigang Zhang, Liyong Zhang, Yang Qu, Jun Chen, Liqun Jiao, Le-Xin Wang, Yifeng Du
BACKGROUND: This study aimed to utilize high-resolution magnetic resonance imaging (MRI) to investigate the characteristics of stable and vulnerable carotid arteriosclerotic plaques, with correlations to histopathological findings. PATIENTS AND METHODS: High-resolution MRI was performed in 817 patients, using three-dimensional magnetic resonance angiography. Plaque composition was evaluated by measuring the areas occupied by calcification, a lipid-rich necrotic core, intra-plaque haemorrhage, and fibrous cap rupture...
March 17, 2017: VASA. Zeitschrift Für Gefässkrankheiten
https://www.readbyqxmd.com/read/28303912/new-technologies-for-the-assessment-of-neuropathies
#18
REVIEW
Roberto Gasparotti, Luca Padua, Chiara Briani, Giuseppe Lauria
Technical advances are rapidly changing the clinical and instrumental approach to peripheral nerve diseases. Magnetic resonance neurography, diffusion tensor imaging and nerve ultrasonography are increasingly entering the diagnostic workup of peripheral neuropathies as tools that complement neurophysiology and enable investigation of proximal structures, such as plexuses and roots. Progress in the design of magnetic resonance scanners and sequences, and the development of high-frequency ultrasound probes mean that high-resolution peripheral nerve imaging is possible, enabling detailed examination of nerve size, morphology and internal fascicular structure that can integrate nerve conduction studies into clinical practice...
March 17, 2017: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/28303611/improving-left-ventricular-segmentation-in-four-dimensional-flow-mri-using-intramodality-image-registration-for-cardiac-blood-flow-analysis
#19
Vikas Gupta, Mariana Bustamante, Alexandru Fredriksson, Carl-Johan Carlhäll, Tino Ebbers
PURPOSE: Assessment of blood flow in the left ventricle using four-dimensional flow MRI requires accurate left ventricle segmentation that is often hampered by the low contrast between blood and the myocardium. The purpose of this work is to improve left-ventricular segmentation in four-dimensional flow MRI for reliable blood flow analysis. METHOD: The left ventricle segmentations are first obtained using morphological cine-MRI with better in-plane resolution and contrast, and then aligned to four-dimensional flow MRI data...
March 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28303376/parkinson-s-disease-diagnostic-utility-of-volumetric-imaging
#20
Wei-Che Lin, Kun-Hsien Chou, Pei-Lin Lee, Nai-Wen Tsai, Hsiu-Ling Chen, Ai-Ling Hsu, Meng-Hsiang Chen, Yung-Cheng Huang, Ching-Po Lin, Cheng-Hsien Lu
PURPOSE: This paper aims to examine the effectiveness of structural imaging as an aid in the diagnosis of Parkinson's disease (PD). METHODS: High-resolution T 1-weighted magnetic resonance imaging was performed in 72 patients with idiopathic PD (mean age, 61.08 years) and 73 healthy subjects (mean age, 58.96 years). The whole brain was parcellated into 95 regions of interest using composite anatomical atlases, and region volumes were calculated. Three diagnostic classifiers were constructed using binary multiple logistic regression modeling: the (i) basal ganglion prior classifier, (ii) data-driven classifier, and (iii) basal ganglion prior/data-driven hybrid classifier...
March 16, 2017: Neuroradiology
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