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Phase contrast Magnetic

Andreas Fehlner, Sebastian Hirsch, Martin Weygandt, Thomas Christophel, Eric Barnhill, Mykola Kadobianskyi, Jürgen Braun, Johannes Bernarding, Ralf Lützkendorf, Ingolf Sack, Stefan Hetzer
PURPOSE: To improve the resolution of elasticity maps by adapting motion and distortion correction methods for phase-based magnetic resonance imaging (MRI) contrasts such as magnetic resonance elastography (MRE), a technique for measuring mechanical tissue properties in vivo. MATERIALS AND METHODS: MRE data of the brain were acquired with echo-planar imaging (EPI) at 3T (n = 14) and 7T (n = 18). Motion and distortion correction parameters were estimated using the magnitude images...
October 20, 2016: Journal of Magnetic Resonance Imaging: JMRI
Wan-Li He, Wei-Kai Zhang, Huan Xu, Li-Hao Li, Zhou Yang, Hui Cao, Dong Wang, Zhi-Gang Zheng, Huai Yang
The magnetic Fe3O4 nanoparticle-doped blue phase liquid crystal (BPLC) was found to have a relatively strong contrast ratio in magnetic-addressed display performance compared to the composites in other phases; this is a new application of the BPLC and a way to prepare a new type of power-free magnetically-driven LC flexible display.
October 18, 2016: Physical Chemistry Chemical Physics: PCCP
Suneesh Kalliath, Rajesh Gopalan Nair, Haridasan Vellani
A 48-year-old man presented with chronic right sided heart failure. 2D echocardiography revealed the classical features of left ventricular endomyocardial fibrosis with a prominent right ventricular apical aneurysm. Right ventriculography further defined the aneurysm. Cardiac magnetic resonance images revealed a thin-walled, apical aneurysm of right ventricle with multiple septations and marked obliteration of left ventricular apex. A delayed-enhancement sequence after the infusion of contrast, demonstrated a hypersignal in the subendocardium, consistent with the right ventricular involvement of endomyocardial fibrosis...
September 2016: Indian Heart Journal
Radek Frič, Erika Kristina Lindstrøm, Geir Andre Ringstad, Kent-André Mardal, Per Kristian Eide
BACKGROUND: In symptomatic Chiari malformation type 1 (CMI), impaired intracranial compliance (ICC) is associated with an increased cranio-spinal pulsatile pressure gradient. Phase-contrast magnetic resonance imaging (MRI) represents a non-invasive modality for the assessment of the pulse pressure gradient at the cranio-cervical junction (CCJ). We wished to explore how the MRI-derived pulse pressure gradient (MRI-dP) compares with invasively measured pulsatile intracranial pressure (ICP) in CMI, and with healthy controls...
October 14, 2016: Acta Neurochirurgica
Norihide Yoneda, Osamu Matsui, Azusa Kitao, Kazuto Kozaka, Satoshi Kobayashi, Motoko Sasaki, Kotaro Yoshida, Dai Inoue, Tetsuya Minami, Toshifumi Gabata
Gadoxetic acid is a contrast agent for magnetic resonance (MR) imaging with hepatocyte-specific properties and is becoming increasingly important in detection and characterization of hepatocellular carcinoma and benign hepatocellular nodules, including focal nodular hyperplasia (FNH), nodular regenerative hyperplasia (NRH), hepatocellular adenoma (HCA), and dysplastic nodule. In these hepatocellular nodules, a positive correlation between the grade of membranous uptake transporter organic anion-transporting polypeptide (OATP) 1B3 expression and signal intensity in the hepatobiliary (HB) phase has been verified...
October 14, 2016: Radiographics: a Review Publication of the Radiological Society of North America, Inc
Alberto Francesco Cereda, Patrizia Pedrotti, Lucio De Capitani, Cristina Giannattasio, Alberto Roghi
BACKGROUND: Eosinophilic granulomatosis with polyangiitis (EGPA) is a systemic necrotizing vasculitis characterized by hypereosinophilia. EGPA typically develops in three clinical phases, beginning with asthma, followed by tissue eosinophilia and finally systemic vasculitis. Cardiac involvement is the most important predictor of mortality; it occurs in approximately 15-60% of EGPA patients, a significant proportion of whom are asymptomatic and have normal electrocardiogram (ECG) and echocardiogram...
October 7, 2016: European Journal of Internal Medicine
Rishit R Merchant, Lorena Maldonado-Camargo, Carlos Rinaldi
The dynamic magnetic susceptibility response of magnetic nanoparticles was used to independently determine the viscosity of the dispersed and continuous phases of oil-in-water emulsions in situ. Cobalt ferrite nanoparticles coated with oleic acid (OA) or poly(ethylene glycol) (PEG) were prepared and mixed with emulsions, where they partitioned to the dispersed oil phase or continuous water phase, respectively. Emulsions with a range of dispersed-phase volume fractions were prepared and characterized using the nanoparticles and conventional rheometry...
September 28, 2016: Journal of Colloid and Interface Science
Animesh Tandon, Lorraine James, Markus Henningsson, René M Botnar, Amanda Potersnak, Gerald F Greil, Tarique Hussain
BACKGROUND: The use of gadolinium contrast agents in cardiovascular magnetic resonance is well-established and serves to improve both vascular imaging as well as enable late gadolinium enhancement (LGE) imaging for tissue characterization. Currently, gadofosveset trisodium, an intravascular contrast agent, combined with a three-dimensional inversion recovery balanced steady state free precession (3D IR bSSFP) sequence, is commonly used in pediatric cardiac imaging and yields excellent vascular imaging, but cannot be used for late gadolinium enhancement...
October 5, 2016: Journal of Cardiovascular Magnetic Resonance
Nagihan Inan, Arzu Arslan, Muhammed Donmez, Hasan Tahsin Sarisoy
BACKGROUND: Imaging plays a critical role not only in the detection, but also in the characterization of lung masses as benign or malignant. OBJECTIVES: To determine the diagnostic accuracy of dynamic magnetic resonance imaging (MRI) in the differential diagnosis of benign and malignant lung masses. PATIENTS AND METHODS: Ninety-four masses were included in this prospective study. Five dynamic series of T1-weighted spoiled gradient echo (FFE) images were obtained, followed by a T1-weighted FFE sequence in the late phase (5th minutes)...
April 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
Shin-Ichiro Sugiyama, Hidenori Endo, Kuniyasu Niizuma, Toshiki Endo, Kenichi Funamoto, Makoto Ohta, Teiji Tominaga
This was a proof-of-concept computational fluid dynamics (CFD) study designed to identify atherosclerotic changes in intracranial aneurysms. We selected 3 patients with multiple unruptured aneurysms including at least one with atherosclerotic changes and investigated whether an image-based CFD study could provide useful information for discriminating the atherosclerotic aneurysms. Patient-specific geometries were constructed from three-dimensional data obtained using rotational angiography. Transient simulations were conducted under patient-specific inlet flow rates measured by phase-contrast magnetic resonance velocimetry...
2016: Computational and Mathematical Methods in Medicine
Emil K S Espe, Kristine Skårdal, Jan Magnus Aronsen, Lili Zhang, Ivar Sjaastad
PURPOSE: To develop a semiautomatic method for rapid segmentation of myocardial tissue phase mapping (TPM) data. METHODS: Manual segmentation of the myocardium was performed at end-diastole and end-systole. The points in both user-defined masks were then automatically tracked over the entire cardiac cycle using temporal integration of the velocity field. Paths that failed to visit both masks at the expected times were excluded, after which masks for all time points were generated automatically from the accepted paths...
October 3, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Daniel Ontaneda, Robert J Fox
Multiple sclerosis (MS) is a chronic demyelinating disease of the central nervous system. Magnetic resonance imaging (MRI) is sensitive to lesion formation both in the brain and spinal cord. Imaging plays a prominent role in the diagnosis and monitoring of MS. Over a dozen anti-inflammatory therapies are approved for MS and the development of many of these medications was made possible through the use of contrast-enhancing lesions on MRI as a phase II outcome. A similar phase II outcome method for the neurodegeneration that underlies progressive courses of the disease is still unavailable...
October 3, 2016: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
S B Paul, E Dhamija, S R Gamanagatti, V Sreenivas, D P Yadav, S Jain, Shalimar, S K Acharya
PURPOSE: To compare the diagnostic accuracy of contrast-enhanced ultrasound (CEUS) with that of multiphase computed tomography (CT) in the evaluation of tumor response to transarterial chemoembolization (TACE) of hepatocellular carcinoma (HCC). MATERIAL AND METHODS: Fifty patients (41 men, 9 women; mean age, 53 years±12.5 [SD]) with a total of 70 HCCs (mean size, 5cm±3 [SD]) were evaluated. Post-TACE therapeutic assessment of HCC was done at 4 weeks. Patients with TACE done earlier and reporting with suspicion for recurrence were also included...
September 27, 2016: Diagnostic and Interventional Imaging
M A Tanatar, A E Böhmer, E I Timmons, M Schütt, G Drachuck, V Taufour, K Kothapalli, A Kreyssig, S L Bud'ko, P C Canfield, R M Fernandes, R Prozorov
The in-plane resistivity anisotropy is studied in strain-detwinned single crystals of FeSe. In contrast to other iron-based superconductors, FeSe does not develop long-range magnetic order below the tetragonal-to-orthorhombic transition at T_{s}≈90  K. This allows for the disentanglement of the contributions to the resistivity anisotropy due to nematic and magnetic orders. Comparing direct transport and elastoresistivity measurements, we extract the intrinsic resistivity anisotropy of strain-free samples...
September 16, 2016: Physical Review Letters
Paul M Manning, Gavin Hamilton, Kang Wang, Chulhyun Park, Jonathan C Hooker, Tanya Wolfson, Anthony Gamst, William M Haufe, Alex N Schlein, Michael S Middleton, Claude B Sirlin
PURPOSE: To compare agreement between region-of-interest (ROI)- and parametric map-based methods of hepatic proton density fat fraction (PDFF) estimation in adults with known or suspected hepatic steatosis secondary to chronic liver disease over a range of imaging and analysis conditions. MATERIALS AND METHODS: In this IRB approved HIPAA compliant prospective single-site study, 31 adults with chronic liver disease undergoing clinical gadoxetic acid-enhanced liver magnetic resonance imaging at 3 T were recruited...
September 29, 2016: Abdominal Radiology
Ursula Reiter, Gert Reiter, Martin Manninger, Gabriel Adelsmayr, Julia Schipke, Alessio Alogna, Alexandra Rajces, Aurelien F Stalder, Andreas Greiser, Christian Mühlfeld, Daniel Scherr, Heiner Post, Burkert Pieske, Michael Fuchsjäger
BACKGROUND: The hypertensive deoxy-corticosterone acetate (DOCA)-salt-treated pig (hereafter, DOCA pig) was recently introduced as large animal model for early-stage heart failure with preserved ejection fraction (HFpEF). The aim of the present study was to evaluate cardiovascular magnetic resonance (CMR) of DOCA pigs and weight-matched control pigs to characterize ventricular, atrial and myocardial structure and function of this phenotype model. METHODS: Five anesthetized DOCA and seven control pigs underwent 3 T CMR at rest and during dobutamine stress...
September 30, 2016: Journal of Cardiovascular Magnetic Resonance
S Kasahara, T Yamashita, A Shi, R Kobayashi, Y Shimoyama, T Watashige, K Ishida, T Terashima, T Wolf, F Hardy, C Meingast, H V Löhneysen, A Levchenko, T Shibauchi, Y Matsuda
The physics of the crossover between weak-coupling Bardeen-Cooper-Schrieffer (BCS) and strong-coupling Bose-Einstein condensate (BEC) limits gives a unified framework of quantum-bound (superfluid) states of interacting fermions. This crossover has been studied in the ultracold atomic systems, but is extremely difficult to be realized for electrons in solids. Recently, the superconducting semimetal FeSe with a transition temperature Tc=8.5 K has been found to be deep inside the BCS-BEC crossover regime. Here we report experimental signatures of preformed Cooper pairing in FeSe, whose energy scale is comparable to the Fermi energies...
2016: Nature Communications
P B Rudolphi, A Recke, E A Langan, P Hunold, B K Kahle
OBJECTIVE/BACKGROUND: Hemodynamic measurements of blood flow in the common femoral vein and artery can be performed readily using duplex sonography. The ratio of venous to arterial volume flow in these vessels, the venous arterial flow index (VAFI), is increased in patients with varicose veins and/or chronic venous disease. The objective was to determine the reproducibility of sonographically measured hemodynamic flow parameters using phase contrast magnetic resonance imaging (MRI). METHODS: Based on hemodynamic volume flow measurements from the common femoral vein and artery the VAFI was calculated in seven patients with varicose veins (C2, Ep, As, Pr) and 32 healthy controls using standard duplex sonography and MRI...
September 26, 2016: European Journal of Vascular and Endovascular Surgery
Mehmet Öztürk, Ahmet Sığırcı, Serkan Ünlü
PURPOSE: This study aimed to determine differences according to age groups and gender in the parameters of aqueductal cerebrospinal fluid (CSF) flow in childhood using phase-contrast cine magnetic resonance imaging (MRI) method. MATERIALS AND METHODS: This prospective study included 47 boys and 36 girls for a total of 83 healthy children. The cases were divided into three groups depending on age as infants (1-12 months), children (12-120 months), and adolescents (120-204 months)...
September 13, 2016: Clinical Imaging
Daniella F Pinho, Naama Lev-Cohain, Haitham Awdeh, Yin Xi, Gaurav Khatri, Takeshi Yokoo, Ivan Pedrosa
PURPOSE: To compare a protocol with higher concentration macrocyclic gadolinium-based contrast agent (GBCA) [study group] to the traditional protocol with lower-concentration linear GBCAs [control group] for breath-held arterial phase magnetic resonance imaging. MATERIAL AND METHODS: A total of 136 patients were quantitatively evaluated for image quality (IQ), breathing artifacts (BA), and timing of the arterial phase (Tap). Quantitative analysis was also performed...
September 4, 2016: Clinical Imaging
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