journal
MENU ▼
Read by QxMD icon Read
search

Magma

journal
https://www.readbyqxmd.com/read/29147819/a-note-from-patrick-j-cozzone-magma-editor-in-chief
#1
EDITORIAL
Patrick J Cozzone
No abstract text is available yet for this article.
November 17, 2017: Magma
https://www.readbyqxmd.com/read/29143137/segmental-biventricular-analysis-of-myocardial-function-using-high-temporal-and-spatial-resolution-tissue-phase-mapping
#2
Marius Menza, Daniela Föll, Jürgen Hennig, Bernd Jung
OBJECTIVE: Myocardial dysfunction of the right ventricle (RV) is an important indicator of RV diseases, e.g. RV infarction or pulmonary hypertension. Tissue phase mapping (TPM) has been widely used to determine function of the left ventricle (LV) by analyzing myocardial velocities. The analysis of RV motion is more complicated due to the different geometry and smaller wall thickness. The aim of this work was to adapt and optimize TPM to the demands of the RV. MATERIALS AND METHODS: TPM measurements were acquired in 25 healthy volunteers using a velocity-encoded phase-contrast sequence and kt-accelerated parallel imaging in combination with optimized navigator strategy and blood saturation...
November 15, 2017: Magma
https://www.readbyqxmd.com/read/29110241/relative-enhanced-diffusivity-noise-sensitivity-protocol-optimization-and-the-relation-to-intravoxel-incoherent-motion
#3
Peter T While, Jose R Teruel, Igor Vidić, Tone F Bathen, Pål Erik Goa
OBJECTIVE: To explore the relationship between relative enhanced diffusivity (RED) and intravoxel incoherent motion (IVIM), as well as the impact of noise and the choice of intermediate diffusion weighting (b value) on the RED parameter. MATERIALS AND METHODS: A mathematical derivation was performed to cast RED in terms of the IVIM parameters. Noise analysis and b value optimization was conducted by using Monte Carlo calculations to generate diffusion-weighted imaging data appropriate to breast and liver tissue at three different signal-to-noise ratios...
November 6, 2017: Magma
https://www.readbyqxmd.com/read/29110240/manipulating-transmit-and-receive-sensitivities-of-radiofrequency-surface-coils-using-shielded-and-unshielded-high-permittivity-materials
#4
Manushka V Vaidya, Cem M Deniz, Christopher M Collins, Daniel K Sodickson, Riccardo Lattanzi
OBJECTIVE: To use high-permittivity materials (HPM) positioned near radiofrequency (RF) surface coils to manipulate transmit/receive field patterns. MATERIALS AND METHODS: A large HPM pad was placed below the RF coil to extend the field of view (FOV). The resulting signal-to-noise ratio (SNR) was compared with that of other coil configurations covering the same FOV in simulations and experiments at 7 T. Transmit/receive efficiency was evaluated when HPM discs with or without a partial shield were positioned at a distance from the coil...
November 6, 2017: Magma
https://www.readbyqxmd.com/read/29110239/t-2-mapping-of-cerebrospinal-fluid-3%C3%A2-t-versus-7%C3%A2-t
#5
Jolanda M Spijkerman, Esben T Petersen, Jeroen Hendrikse, Peter Luijten, Jaco J M Zwanenburg
OBJECT: Cerebrospinal fluid (CSF) T 2 mapping can potentially be used to investigate CSF composition. A previously proposed CSF T 2-mapping method reported a T 2 difference between peripheral and ventricular CSF, and suggested that this reflected different CSF compositions. We studied the performance of this method at 7 T and evaluated the influence of partial volume and B 1 and B 0 inhomogeneity. MATERIALS AND METHODS: T 2-preparation-based CSF T 2-mapping was performed in seven healthy volunteers at 7 and 3 T, and was compared with a single echo spin-echo sequence with various echo times...
November 6, 2017: Magma
https://www.readbyqxmd.com/read/29075909/rapid-measurement-of-intravoxel-incoherent-motion-ivim-derived-perfusion-fraction-for-clinical-magnetic-resonance-imaging
#6
Emma M Meeus, Jan Novak, Hamid Dehghani, Andrew C Peet
OBJECTIVE: This study aimed to investigate the reliability of intravoxel incoherent motion (IVIM) model derived parameters D and f and their dependence on b value distributions with a rapid three b value acquisition protocol. MATERIALS AND METHODS: Diffusion models for brain, kidney, and liver were assessed for bias, error, and reproducibility for the estimated IVIM parameters using b values 0 and 1000, and a b value between 200 and 900, at signal-to-noise ratios (SNR) 40, 55, and 80...
October 26, 2017: Magma
https://www.readbyqxmd.com/read/29067539/two-dimensional-xd-grasp-provides-better-image-quality-than-conventional-2d-cardiac-cine-mri-for-patients-who-cannot-suspend-respiration
#7
Eve Piekarski, Teodora Chitiboi, Rebecca Ramb, Larry A Latson, Puneet Bhatla, Li Feng, Leon Axel
OBJECTIVES: Residual respiratory motion degrades image quality in conventional cardiac cine MRI (CCMRI). We evaluated whether a free-breathing (FB) radial imaging CCMRI sequence with compressed sensing reconstruction [extradimensional (e.g. cardiac and respiratory phases) golden-angle radial sparse parallel, or XD-GRASP] could provide better image quality than a conventional Cartesian breath-held (BH) sequence in an unselected population of patients undergoing clinical CCMRI. MATERIALS AND METHODS: One hundred one patients who underwent BH and FB imaging in a midventricular short-axis plane at a matching location were included...
October 24, 2017: Magma
https://www.readbyqxmd.com/read/29063424/assessing-renal-changes-after-remote-ischemic-preconditioning-ripc-of-the-upper-extremity-using-bold-imaging-at-3t
#8
Florian Siedek, Thorsten Persigehl, Roman-Ulrich Mueller, Volker Burst, Thomas Benzing, David Maintz, Stefan Haneder
OBJECTIVE: Acute kidney injury (AKI) is an important risk factor for a number of adverse outcomes including end-stage renal disease and cardiovascular morbidity and mortality. Whilst many clinical situations that can induce AKI are known-e.g. drug toxicity, contrast agent exposure or ischemia during surgery-targeted preventive or therapeutic measures are still lacking. As to renoprotective strategies, remote ischemic preconditioning (RIPC) is one of the most promising novel approaches and has been examined by a number of clinical trials...
October 23, 2017: Magma
https://www.readbyqxmd.com/read/29027041/increased-hepatic-fatty-acid-polyunsaturation-precedes-ectopic-lipid-deposition-in-the-liver-in-adaptation-to-high-fat-diets-in-mice
#9
Ana Francisca Soares, João M N Duarte, Rolf Gruetter
OBJECTIVE: We monitored hepatic lipid content (HLC) and fatty acid (FA) composition in the context of enhanced lipid handling induced by a metabolic high-fat diet (HFD) challenge and fasting. MATERIALS AND METHODS: Mice received a control diet (10% of kilocalories from fat, N = 14) or an HFD (45% or 60% of kilocalories from fat, N = 10 and N = 16, respectively) for 26 weeks. A subset of five mice receiving an HFD (60% of kilocalories from fat) were switched to the control diet for the final 7 weeks...
October 12, 2017: Magma
https://www.readbyqxmd.com/read/28939952/2d-and-3d-texture-analysis-to-differentiate-brain-metastases-on-mr-images-proceed-with-caution
#10
Monika Béresová, Andrés Larroza, Estanislao Arana, József Varga, László Balkay, David Moratal
OBJECTIVE: To find structural differences between brain metastases of lung and breast cancer, computing their heterogeneity parameters by means of both 2D and 3D texture analysis (TA). MATERIALS AND METHODS: Patients with 58 brain metastases from breast (26) and lung cancer (32) were examined by MR imaging. Brain lesions were manually delineated by 2D ROIs on the slices of contrast-enhanced T1-weighted (CET1) images, and local binary patterns (LBP) maps were created from each region...
September 22, 2017: Magma
https://www.readbyqxmd.com/read/28933028/improving-fmri-in-signal-drop-out-regions-at-7%C3%A2-t-by-using-tailored-radio-frequency-pulses-application-to-the-ventral-occipito-temporal-cortex
#11
Catarina Rua, Stephen J Wastling, Mauro Costagli, Mark R Symms, Laura Biagi, Mirco Cosottini, Alberto Del Guerra, Michela Tosetti, Gareth J Barker
OBJECTIVE: Signal drop-off occurs in echo-planar imaging in inferior brain areas due to field gradients from susceptibility differences between air and tissue. Tailored-RF pulses based on a hyperbolic secant (HS) have been shown to partially recover signal at 3 T, but have not been tested at higher fields. MATERIALS AND METHODS: The aim of this study was to compare the performance of an optimized tailored-RF gradient-echo echo-planar imaging (TRF GRE-EPI) sequence with standard GRE-EPI at 7 T, in a passive viewing of faces or objects fMRI paradigm in healthy subjects...
September 20, 2017: Magma
https://www.readbyqxmd.com/read/28932991/automated-reference-free-detection-of-motion-artifacts-in-magnetic-resonance-images
#12
Thomas Küstner, Annika Liebgott, Lukas Mauch, Petros Martirosian, Fabian Bamberg, Konstantin Nikolaou, Bin Yang, Fritz Schick, Sergios Gatidis
OBJECTIVES: Our objectives were to provide an automated method for spatially resolved detection and quantification of motion artifacts in MR images of the head and abdomen as well as a quality control of the trained architecture. MATERIALS AND METHODS: T1-weighted MR images of the head and the upper abdomen were acquired in 16 healthy volunteers under rest and under motion. Images were divided into overlapping patches of different sizes achieving spatial separation...
September 20, 2017: Magma
https://www.readbyqxmd.com/read/28921052/in-vitro-evaluation-of-flow-patterns-and-turbulent-kinetic-energy-in-trans-catheter-aortic-valve-prostheses
#13
Daniel Giese, Kilian Weiss, Bettina Baeßler, Navid Madershahian, Yeong-Hoon Choi, David Maintz, Alexander C Bunck
OBJECTIVES: The objective of the current work was to evaluate flow and turbulent kinetic energy in different transcatheter aortic valve implants using highly undersampled time-resolved multi-point 3-directional phase-contrast measurements (4D Flow MRI) in an in vitro setup. MATERIALS AND METHODS: A pulsatile flow setup was used with a compliant tubing mimicking a stiff left ventricular outflow tract and ascending aorta. Five different implants were measured using a highly undersampled multi-point 4D Flow MRI sequence...
September 18, 2017: Magma
https://www.readbyqxmd.com/read/28914389/state-of-the-art-review-stress-t1-mapping-technical-considerations-pitfalls-and-emerging-clinical-applications
#14
REVIEW
Stefan K Piechnik, Stefan Neubauer, Vanessa M Ferreira
In vivo mapping of the myocardial T1 relaxation time has recently attained wide clinical validation of its potential utility. In this review, we address the basic principles of the T1 mapping techniques, with particular attention to the emerging application of vasodilatory stress agents to interrogate the myocardial microvascular compartment, and differences between commonly used T1 mapping methods when applied in clinical practice.
September 15, 2017: Magma
https://www.readbyqxmd.com/read/28894997/a-novel-framework-for-evaluating-the-image-accuracy-of-dynamic-mri-and-the-application-on-accelerated-breast-dce-mri
#15
Yuan Le, Marcel Dominik Nickel, Stephan Kannengiesser, Berthold Kiefer, Bruce Spottiswoode, Brian Dale, Victor Soon, Chen Lin
OBJECTIVE: To develop a novel framework for evaluating the accuracy of quantitative analysis on dynamic contrast-enhanced (DCE) MRI with a specific combination of imaging technique, scanning parameters, and scanner and software performance and to test this framework with breast DCE MRI with Time-resolved angiography WIth Stochastic Trajectories (TWIST). MATERIALS AND METHODS: Realistic breast tumor phantoms were 3D printed as cavities and filled with solutions of MR contrast agent...
September 11, 2017: Magma
https://www.readbyqxmd.com/read/28884314/spectroscopic-sampling-of-the-left-side-of-long-te-spin-echoes-a-free-lunch
#16
Robert V Mulkern, Mukund Balasubramanian
OBJECTIVE: Use of spectroscopically-acquired spin echoes typically involves Fourier transformation of the right side of the echo while largely neglecting the left side. For sufficiently long echo times, the left side may have enough spectral resolution to offer some utility. Since the acquisition of this side is "free", we deemed it worthy of attention and investigated the spectral properties and information content of this data. MATERIALS AND METHODS: Theoretical expressions for left- and right-side spectra were derived assuming Lorentzian frequency distributions...
September 7, 2017: Magma
https://www.readbyqxmd.com/read/28993990/esmrmb-2017-34th-annual-scientific-meeting-barcelona-es-october-19-october-21-author-index
#17
(no author information available yet)
No abstract text is available yet for this article.
October 2017: Magma
https://www.readbyqxmd.com/read/28993989/esmrmb-2017-34th-annual-scientific-meeting-barcelona-es-october-19-october-21-abstracts-friday
#18
(no author information available yet)
No abstract text is available yet for this article.
October 2017: Magma
https://www.readbyqxmd.com/read/28993988/esmrmb-2017-34th-annual-scientific-meeting-barcelona-es-october-19-october-21-abstracts-saturday
#19
(no author information available yet)
No abstract text is available yet for this article.
October 2017: Magma
https://www.readbyqxmd.com/read/28993987/esmrmb-2017-34th-annual-scientific-meeting-barcelona-es-october-19-october-21-abstracts-thursday
#20
(no author information available yet)
No abstract text is available yet for this article.
October 2017: Magma
journal
journal
31402
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"