keyword
MENU ▼
Read by QxMD icon Read
search

Phase contrast Magnetic

keyword
https://www.readbyqxmd.com/read/28548328/epithelioid-trophoblastic-tumor-of-the-uterus-a-case-report-with-radiologic-pathologic-correlation
#1
Ayumi Ohya, Kayoko Higuchi, Hisashi Shimojo, Yasunari Fujinaga, Masumi Kadoya, Shigeki Shiohara
Herein, we report a rare case of an epithelioid trophoblastic tumor of the uterus with radiologic-pathologic correlation in a 56-year-old postmenopausal woman. On T2-weighted magnetic resonance (MR) imaging, the tumor appeared as a hypointense irregular mass compared with the surrounding myometrium of the uterine corpus and encircled the cavity of the lower uterine segment. On dynamic contrast-enhanced MR images, the tumor appeared as a hypovascular mass and an inhomogeneously hyperintense mass in the delayed phase...
May 26, 2017: Journal of Obstetrics and Gynaecology Research
https://www.readbyqxmd.com/read/28547117/non-hypervascular-hypointense-nodules-at-gadoxetic-acid-mri-hepatocellular-carcinoma-risk-assessment-with-emphasis-on-the-role-of-diffusion-weighted-imaging
#2
Chiara Briani, Marco Di Pietropaolo, Massimo Marignani, Francesco Carbonetti, Paola Begini, Vincenzo David, Elsa Iannicelli
INTRODUCTION AND AIM: In cirrhotic patients, the characterization of hypovascular nodules, hypointense on hepatobiliary phase gadoxetic acid disodium-enhanced magnetic resonance images (Gd-EOB-DTPA-enhanced MRI), is essential to look for the proper approach strategy. Our objective was to evaluate the imaging features and risk assessment of hypovascular nodules, hypointense on Gd-EOB-DTPA-enhanced MRI, focusing on the diagnostic value of diffusion-weighted imaging (DWI). MATERIAL AND METHODS: This prospective study includes 35 patients with 50 hypovascular hypointense nodules...
May 25, 2017: Journal of Gastrointestinal Cancer
https://www.readbyqxmd.com/read/28544159/simultaneous-measurement-of-t1-b1-and-pharmacokinetic-model-parameters-using-active-contrast-encoding-ace-mri
#3
Jin Zhang, Kerryanne Winters, Olivier Reynaud, Sungheon Gene Kim
The aim of this study was to assess the feasibility of combining dynamic contrast enhanced-magnetic resonance imaging (DCE-MRI) with the measurement of the radiofrequency (RF) transmit field B1 and pre-contrast longitudinal relaxation time T10 . A novel approach has been proposed to simultaneously estimate B1 and T10 from a modified DCE-MRI scan that actively encodes the washout phase of the curve with different amounts of T1 and B1 weighting using multiple flip angles and repetition times, hence referred to as active contrast encoding (ACE)-MRI...
May 22, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28543787/accurate-determination-of-brain-metabolite-concentrations-using-eretic-as-external-reference
#4
Niklaus Zoelch, Andreas Hock, Susanne Heinzer-Schweizer, Nikolai Avdievitch, Anke Henning
Magnetic Resonance Spectroscopy (MRS) can provide in vivo metabolite concentrations in standard concentration units if a reliable reference signal is available. For (1) H MRS in the human brain, typically the signal from the tissue water is used as the (internal) reference signal. However, a concentration determination based on the tissue water signal most often requires a reliable estimate of the water concentration present in the investigated tissue. Especially in clinically interesting cases, this estimation might be difficult...
May 25, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28540400/imaging-of-cerebral-ischemic-edema-and-neuronal-death
#5
REVIEW
Rüdiger von Kummer, Imanuel Dzialowski
PURPOSE: In acute cerebral ischemia, the assessment of irreversible injury is crucial for treatment decisions and the patient's prognosis. There is still uncertainty how imaging can safely differentiate reversible from irreversible ischemic brain tissue in the acute phase of stroke. METHODS: We have searched PubMed and Google Scholar for experimental and clinical papers describing the pathology and pathophysiology of cerebral ischemia under controlled conditions...
May 24, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28539559/simultaneous-visualization-of-vessels-and-brain-tumor-with-contrast-enhanced-three-dimensional-phase-contrast-mr-imaging
#6
Yutaka Shigenaga, Masato Sasaki, Takeshi Ishimoto, Keiko Ama
The sequence for concurrently depicting engulfed vessels and a well-enhanced tumor in once-off scanning has never been reported for preoperative magnetic resonance imaging for brain tumor resection. Multimodal fusion techniques have been recently developed, but the risks of misregistration still remain. Here a case is reported where contrast-enhanced three-dimensional phase contrast sequence concurrently depicted an engulfed vessel and metastatic brain tumor in once-off scanning and related technical aspects are discussed...
May 24, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28537276/magnetic-field-induced-multiple-topological-phases-in-pyrochlore-iridates-with-mott-criticality
#7
Kentaro Ueda, Taekoo Oh, Bohm-Jung Yang, Ryoma Kaneko, Jun Fujioka, Naoto Nagaosa, Yoshinori Tokura
The interplay between electron correlation and spin-orbit coupling in solids has been proven to be an abundant gold mine for emergent topological phases. Here we report the results of systematic magnetotransport study on bandwidth-controlled pyrochlore iridates R2Ir2O7 near quantum metal-insulator transition (MIT). The application of a magnetic field along [001] crystallographic direction (H//[001]) significantly decreases resistivity while producing a unique Hall response, which indicates the emergence of the novel semi-metallic state in the course of the magnetic transformation from all-in all-out (AIAO, 4/0) to 2-in 2-out (2/2) spin configuration...
May 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28534652/a-review-of-the-evidence-of-zolpidem-efficacy-in-neurological-disability-after-brain-damage-due-to-stroke-trauma-and-hypoxia-a-justification-of-further-clinical-trials
#8
J A Sutton, R P Clauss
During 15 years, 23 clinical reports and 6 studies have demonstrated associations between sub-sedative doses of zolpidem and recoveries from brain damage due to strokes, trauma and hypoxia. Clinical findings include unexpected awakenings from vegetative states and regressions of stroke symptoms after dosing that disappear during elimination and reappear on repeat dosing. Initially single-photon emission computed tomography scans showed improved perfusion within, around and distant from infarctions. Then positron emission tomography scans and electroencephalography detected renewed metabolic and neuronal activity...
May 23, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28530848/splanchnic-thoracoabdominal-and-cerebral-blood-flow-volumes-in-healthy-children-and-young-adults-in-fasting-and-postprandial-states-determining-reference-ranges-by-using-phase-contrast-mr-imaging
#9
Prakash Muthusami, Shi-Joon Yoo, Rajiv Chaturvedi, Navjot Gill, Jonathan Windram, Daryl Schantz, Milan Prsa, Pablo Caro-Dominguez, Mike Seed, Lars Grosse-Wortmann, Simon C Ling, Govind B Chavhan
Purpose To estimate reference ranges for blood flow volume (BFV) in major splanchnic, thoracoabdominal, and neck vessels by using phase-contrast magnetic resonance (MR) imaging in children and young adults in fasting and postprandial states. Materials and Methods In this institutional research ethics board-approved prospective study, healthy volunteers underwent phase-contrast MR imaging in a fasting state and again after a standardized meal. BFV values were reported as medians and ranges, and postmeal to premeal BFV ratios were calculated...
May 22, 2017: Radiology
https://www.readbyqxmd.com/read/28529683/gd-eob-dtpa-based-magnetic-resonance-imaging-for-predicting-liver-response-to-portal-vein-embolization
#10
Janio Szklaruk, Gustavo Luersen, Jingfei Ma, Wei Wei, Michelle Underwood
AIM: To evaluate the correlation between degree of kinetic growth (kGR) of the liver following portal vein embolization (PVE) liver and the enhancement of the during the hepatobiliary phase of contrast administration and to evaluate if the enhancement can be used to predict response to PVE prior to the procedure. METHODS: Seventeen patients were consented for the prospective study. All patients had an MR of the abdomen with Gd-EOB-DTPA. Fourteen patients underwent PVE...
April 28, 2017: World Journal of Radiology
https://www.readbyqxmd.com/read/28524678/filling-enforced-magnetic-dirac-semimetals-in-two-dimensions
#11
Steve M Young, Benjamin J Wieder
Filling-enforced Dirac semimetals, or those required at specific fillings by the combination of crystalline and time-reversal symmetries, have been proposed in numerous materials. However, Dirac points in these materials are not generally robust against breaking or modifying time-reversal symmetry. We present a new class of two-dimensional Dirac semimetal protected by the combination of crystal symmetries and a special, antiferromagnetic time-reversal symmetry. Systems in this class of magnetic layer groups, while having broken time-reversal symmetry, still respect the operation of time-reversal followed by a half-lattice translation...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28522658/effect-of-fontan-geometry-on-exercise-haemodynamics-and-its-potential-implications
#12
Elaine Tang, Zhenglun Alan Wei, Kevin K Whitehead, Reza H Khiabani, Maria Restrepo, Lucia Mirabella, James Bethel, Stephen M Paridon, Bradley S Marino, Mark A Fogel, Ajit P Yoganathan
OBJECTIVE: Exercise intolerance afflicts Fontan patients with total cavopulmonary connections (TCPCs) causing a reduction in quality of life. Optimising TCPC design is hypothesised to have a beneficial effect on exercise capacity. This study investigates relationships between TCPC geometries and exercise haemodynamics and performance. METHODS: This study included 47 patients who completed metabolic exercise stress test with cardiac magnetic resonance (CMR). Phase-contrast CMR images were acquired immediately following supine lower limb exercise...
May 18, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28521821/intratumoral-and-peritumoral-radiomics-for-the-pretreatment-prediction-of-pathological-complete-response-to-neoadjuvant-chemotherapy-based-on-breast-dce-mri
#13
Nathaniel M Braman, Maryam Etesami, Prateek Prasanna, Christina Dubchuk, Hannah Gilmore, Pallavi Tiwari, Donna Pletcha, Anant Madabhushi
BACKGROUND: In this study, we evaluated the ability of radiomic textural analysis of intratumoral and peritumoral regions on pretreatment breast cancer dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) to predict pathological complete response (pCR) to neoadjuvant chemotherapy (NAC). METHODS: A total of 117 patients who had received NAC were retrospectively analyzed. Within the intratumoral and peritumoral regions of T1-weighted contrast-enhanced MRI scans, a total of 99 radiomic textural features were computed at multiple phases...
May 18, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/28514950/lung-function-imaging-methods-in-cystic-fibrosis-pulmonary-disease
#14
REVIEW
Magdalena Kołodziej, Michael J de Veer, Marian Cholewa, Gary F Egan, Bruce R Thompson
Monitoring of pulmonary physiology is fundamental to the clinical management of patients with Cystic Fibrosis. The current standard clinical practise uses spirometry to assess lung function which delivers a clinically relevant functional readout of total lung function, however does not supply any visible or localised information. High Resolution Computed Tomography (HRCT) is a well-established current 'gold standard' method for monitoring lung anatomical changes in Cystic Fibrosis patients. HRCT provides excellent morphological information, however, the X-ray radiation dose can become significant if multiple scans are required to monitor chronic diseases such as cystic fibrosis...
May 17, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28512159/employing-extracellular-volume-cardiovascular-magnetic-resonance-measures-of-myocardial-fibrosis-to-foster-novel-therapeutics
#15
Erik B Schelbert, Hani N Sabbah, Javed Butler, Mihai Gheorghiade
Quantifying myocardial fibrosis (MF) with myocardial extracellular volume measures acquired during cardiovascular magnetic resonance promises to transform clinical care by advancing pathophysiologic understanding and fostering novel therapeutics. Extracellular volume quantifies MF by measuring the extracellular compartment depicted by the myocardial uptake of contrast relative to plasma. MF is a key domain of dysfunctional but viable myocardium among others (eg, microvascular dysfunction and cardiomyocyte/mitochondrial dysfunction)...
June 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28508831/dual-phase-cone-beam-computed-tomography-in-detecting-3-cm-hepatocellular-carcinomas-during-transarterial-chemoembolization
#16
Xiaodong Wang, Hooman Yarmohammadi, Guang Cao, Xinqiang Ji, Jungang Hu, Hirad Yarmohammadi, Hui Chen, Xu Zhu, Renjie Yang, Stephen B Solomon
OBJECTIVE: The objective of this study was to evaluate the sensitivity of dual phase cone-beam computed tomography (CBCT) in detecting small (<3 cm in diameter) hepatocellular carcinoma (HCC) tumors during transarterial chemoembolization (TACE). MATERIALS AND METHODS: Twenty-two consecutive patients with unresectable small HCCs in whom TACE was performed were retrospectively evaluated. Contrast CT or contrast magnetic resonance imaging (MRI) was performed in all patients within 1 month prior to the procedure...
January 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28508510/impaired-atrioventricular-transport-in-patients-with-transposition-of-the-great-arteries-palliated-by-atrial-switch-and-preserved-systolic-right-ventricular-function-a-magnetic-resonance-imaging-study
#17
Magalie Ladouceur, Nadjia Kachenoura, Gilles Soulat, Emilie Bollache, Alban Redheuil, Michel Azizi, Christophe Delclaux, Gilles Chatellier, Pierre Boutouyrie, Laurence Iserin, Damien Bonnet, Elie Mousseaux
OBJECTIVES: We aimed (1) determine if systemic right ventricle filling parameters influence systemic right ventricle stroke volume in adult patients with D-transposition of the great arteries (D-TGA) palliated by atrial switch, using cardiac magnetic resonance imaging and echocardiography, and (2) to study relationship of these diastolic parameters with exercise performance and BNP, in patients with preserved systolic systemic right ventricle function. DESIGN: Single-center, cross-sectional, prospective study...
May 16, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28508068/emergence-of-topological-semimetals-in-gap-closing-in-semiconductors-without-inversion-symmetry
#18
Shuichi Murakami, Motoaki Hirayama, Ryo Okugawa, Takashi Miyake
A band gap for electronic states in crystals governs various properties of solids, such as transport, optical, and magnetic properties. Its estimation and control have been an important issue in solid-state physics. The band gap can be controlled externally by various parameters, such as pressure, atomic compositions, and external field. Sometimes, the gap even collapses by tuning some parameter. In the field of topological insulators, this closing of the gap at a time-reversal invariant momentum indicates a band inversion, that is, it leads to a topological phase transition from a normal insulator to a topological insulator...
May 2017: Science Advances
https://www.readbyqxmd.com/read/28507825/spatiotemporal-strategies-for-joint-segmentation-and-motion-tracking-from-cardiac-image-sequences
#19
Huafeng Liu, Ting Wang, Lei Xu, Pengcheng Shi
Although accurate and robust estimations of the deforming cardiac geometry and kinematics from cine tomographic medical image sequences remain a technical challenge, they have significant clinical value. Traditionally, boundary or volumetric segmentation and motion estimation problems are considered as two sequential steps, even though the order of these processes can be different. In this paper, we present an integrated, spatiotemporal strategy for the simultaneous joint recovery of these two ill-posed problems...
2017: IEEE Journal of Translational Engineering in Health and Medicine
https://www.readbyqxmd.com/read/28506472/gadolinium-accumulation-after-contrast-enhanced-magnetic-resonance-imaging-which-implications-in-patients-with-crohn-s-disease
#20
Edoardo Savarino, Vito Chianca, Giorgia Bodini, Domenico Albano, Carmelo Messina, Gian Eugenio Tontini, Luca Maria Sconfienza
Crohn's disease (CD) is a chronic inflammatory condition of the bowel, characterized by an alternation of remission and relapse phases, leading to a progressive intestinal damage with loss of function. Magnetic resonance enterography has been widely used in the past for the evaluation of fistulizing disease, but its use increased over time, being considered helpful in different moments of disease course. Intravenous injection of Gadolinium-based contrast agents has been demonstrated to be crucial to assess mucosal inflammation, transmural involvement, and extraintestinal disease...
April 26, 2017: Digestive and Liver Disease
keyword
keyword
112495
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"