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https://www.readbyqxmd.com/read/28543722/a-comparison-of-optimization-algorithms-for-localized-in-vivo-b0-shimming
#1
Sahar Nassirpour, Paul Chang, Ariane Fillmer, Anke Henning
PURPOSE: To compare several different optimization algorithms currently used for localized in vivo B0 shimming, and to introduce a novel, fast, and robust constrained regularized algorithm (ConsTru) for this purpose. METHODS: Ten different optimization algorithms (including samples from both generic and dedicated least-squares solvers, and a novel constrained regularized inversion method) were implemented and compared for shimming in five different shimming volumes on 66 in vivo data sets from both 7 T and 9...
May 22, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28543615/improved-image-quality-and-reduced-power-deposition-in-the-spine-at-3-t-using-extremely-high-permittivity-materials
#2
Kirsten Koolstra, Peter Börnert, Wyger Brink, Andrew Webb
PURPOSE: To explore the effect of using extremely high permittivity (εr ∼1,000) materials on image quality and power requirements of spine imaging at 3 T. THEORY AND METHODS: A linear array of high permittivity dielectric blocks made of lead zirconate titanate (PZT) was designed and characterized by electromagnetic simulations and experiments. Their effect on the transmit efficiency, receive sensitivity, power deposition, and diagnostic image quality was analyzed in vivo in 10 healthy volunteers...
May 22, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28543430/planet-an-ellipse-fitting-approach-for-simultaneous-t1-and-t2-mapping-using-phase-cycled-balanced-steady-state-free-precession
#3
Yulia Shcherbakova, Cornelis A T van den Berg, Chrit T W Moonen, Lambertus W Bartels
PURPOSE: To demonstrate the feasibility of a novel, ellipse fitting approach, named PLANET, for simultaneous estimation of relaxation times T1 and T2 from a single 3D phase-cycled balanced steady-state free precession (bSSFP) sequence. METHODS: A method is presented in which the elliptical signal model is used to describe the phase-cycled bSSFP steady-state signal. The fitting of the model to the acquired data is reformulated into a linear convex problem, which is solved directly by a linear least squares method, specific to ellipses...
May 22, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28533573/comparison-of-early-results-and-complications-between-multi-and-single-port-sleeve-gastrectomy-a-randomized-clinical-study
#4
Seyed Vahid Hosseini, Seyed Ali Hosseini, Ahmed Mohammed Ali Hussein Al-Hurry, Hajar Khazraei, Fatemeh Ganji, Fatemeh Sadeghi
BACKGROUND: In recent years, laparoscopic sleeve gastrectomy (LSG) has become more acceptable for obese patients. Single-port sleeve gastrectomy (SPSG) is more popular since each abdominal incision carries the risk of bleeding, hernia, and internal organ injury as well as exponentially affecting cosmesis. This cross-sectional study aimed at comparing multi-port sleeve gastrectomy (MPSG) and SPSG in terms of their early results and complications. METHODS: Out of129 obese patients candidated for LSG, 102 patients were assigned to 2 groups of SPSG and MPSG...
May 2017: Iranian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28526630/what-is-the-impact-of-bariatric-surgery-on-erectile-function-a%C3%A2-systematic-review-and-meta-analysis
#5
REVIEW
Felipe Placco Araujo Glina, Júlia Walter de Freitas Barboza, Victor Moises Nunes, Sidney Glina, Wanderley Marques Bernardo
INTRODUCTION: Obesity is a worldwide public health issue that has severe psychological and social implications. Erectile dysfunction also is a prevalent clinical situation, and obesity is one of the primary risk factors for its development. AIM: To determine whether bariatric surgery can lessen erectile dysfunction in obese men because of evidence showing that weight loss in obese men contributes to decreasing erectile dysfunction and bariatric surgery contributes to significant weight loss...
May 16, 2017: Sexual Medicine Reviews
https://www.readbyqxmd.com/read/28524556/the-larmor-frequency-shift-in-magnetically-heterogeneous-media-depends-on-their-mesoscopic-structure
#6
Alexander Ruh, Harald Scherer, Valerij G Kiselev
PURPOSE: Recent studies have addressed the determination of the NMR precession frequency in biological tissues containing magnetic susceptibility differences between cell types. The purpose of this study is to investigate the dependence of the precession frequency on medium microstructure using a simple physical model. THEORY: This dependence is governed by diffusion of NMR-visible molecules in magnetically heterogeneous microenvironments. In the limit of fast diffusion, the precession frequency is determined by the average susceptibility-induced magnetic field, whereas in the limit of slow diffusion it is determined by the average local phase factor of precessing spins...
May 19, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28524543/snapshot-whole-brain-t1-relaxometry-using-steady-state-prepared-spiral-multislice-variable-flip-angle-imaging
#7
Rahel Heule, Josef Pfeuffer, Oliver Bieri
PURPOSE: Variable flip angle (VFA) imaging is widely used for whole-brain T1 quantification. Because of the requirement to acquire at least two sets of MR images at different flip angles, VFA relaxometry is relatively slow. Here, whole-brain VFA T1 mapping at 1.5 T is accelerated by using efficient spiral non-Cartesian imaging METHODS: To quantify T1 in the human brain, radiofrequency spoiled gradient-echo imaging is performed at two optimized flip angles using an interleaved 2D multislice sequence with high spoiling efficiency...
May 19, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28520198/dynamic-and-steady-state-oxygen-dependent-lung-relaxometry-using-inversion-recovery-ultra-fast-steady-state-free-precession-imaging-at-1-5-t
#8
Grzegorz Bauman, Orso Pusterla, Francesco Santini, Oliver Bieri
PURPOSE: To demonstrate the feasibility of oxygen-dependent relaxometry in human lung using an inversion recovery ultra-fast steady-state free precession (IR-ufSSFP) technique. METHODS: Electrocardiogram-triggered pulmonary relaxometry with IR-ufSSFP was performed in 7 healthy human subjects at 1.5 T. The data were acquired under both normoxic and hyperoxic conditions. In a single breath-hold of less than 9 seconds, 30 transient state IR-ufSSFP images were acquired, yielding longitudinal (T1) and transversal (T2) relaxometry parameter maps using voxel-wise nonlinear fitting...
May 18, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28520086/activated-fgfr3-prevents-subchondral-bone-sclerosis-during-the-development-of-osteoarthritis-in-transgenic-mice-with-achondroplasia
#9
Toshiaki Okura, Masaki Matsushita, Kenichi Mishima, Ryusaku Esaki, Taisuke Seki, Naoki Ishiguro, Hiroshi Kitoh
The purpose of this study is to investigate the morphometric changes of the subchondral bone during the development of osteoarthritis (OA) in transgenic mice with achondroplasia (Fgfr3(ach) ) carrying a heterozygous gain-of-function mutation in Fgfr3. Two OA models (spontaneously developed with age: the aging model, and surgically induced by destabilization of the medial meniscus: the DMM model) were established. Articular cartilage, epiphysis and metaphysis of the knee joint were histologically and morphometrically compared between wild-type mice and Fgfr3(ach) mice in both OA models...
May 18, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28518009/aeromedical-evacuation-using-extra-corporeal-life-support-after-resuscitated-cardiac-arrest
#10
David Gerard, Hervé Raffin, Guillaume Lebreton
BACKGROUND: Extra corporeal life support (ECLS) is presently first line therapy for refractory cardiogenic shock. Mobile circulatory support teams implant ECLS or extra corporeal membrane oxygenation (ECMO) in patients in the hospital without circulatory support. These patients are then transported to specialized centers. Here we report a case of sending a mobile circulatory support team abroad, followed by air ambulance evacuation, which, to our knowledge, has never been used as part of medical assistance abroad...
April 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28518007/patient-centric-side-effect-risk-assessment-for-medications-used-during-aeromedical-evacuations
#11
Shana A Huntsberger, William P Butler, Richard R Chapleau
BACKGROUND: The U.S. Air Force performs more than 6000 aeromedical transport flights annually, both internationally and domestically. Many of these flights include patients requiring pain relief medications. The risk of side effects from such medications administered at altitude is unknown, but understanding these risks is vital when selecting the safest pain management strategies to achieve optimal postflight outcomes. METHODS: Using an evidence-based medication side effect risk assessment model, we compared our patient-centric approach to an aircrew-centric approach using medications approved for use in U...
April 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28516485/simultaneous-measurement-of-t2-and-apparent-diffusion-coefficient-t2-adc-in-the-heart-with-motion-compensated-spin-echo-diffusion-weighted-imaging
#12
Eric Aliotta, Kévin Moulin, Zhaohuan Zhang, Daniel B Ennis
PURPOSE: To evaluate a technique for simultaneous quantitative T2 and apparent diffusion coefficient (ADC) mapping in the heart (T2 +ADC) using spin echo (SE) diffusion-weighted imaging (DWI). THEORY AND METHODS: T2 maps from T2 +ADC were compared with single-echo SE in phantoms and with T2 -prepared (T2 -prep) balanced steady-state free precession (bSSFP) in healthy volunteers. ADC maps from T2 +ADC were compared with conventional DWI in phantoms and in vivo. T2 +ADC was also demonstrated in a patient with acute myocardial infarction (MI)...
May 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28516482/multiple-boli-arterial-spin-labeling-for-high-signal-to-noise-rodent-brain-perfusion-imaging
#13
Antoine Vallatos, Lesley Gilmour, Anthony J Chalmers, William M Holmes
PURPOSE: A systematic method is proposed for optimizing a promising preclinical arterial spin labeling (ASL) sequence based on the use of a train of adiabatic radiofrequency pulses labeling successive boli of blood water. METHODS: The sequence optimization is performed and evaluated using brain imaging experiments in mice and in rats. It involves the investigation of several parameters, ranging from the number of adiabatic pulses and labeling duration to the properties of the adiabatic hyperbolic secant pulses (ie, amplitude and frequency modulation)...
May 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28512362/-copenhagen-psychosocial-questionnaire-copsoq-psychometric-properties-of-selected-scales-in-the-polish-version
#14
Maria Widerszal-Bazyl
BACKGROUND: The Copenhagen Psychosocial Questionniare (COPSOQ) has many advantages as compared to other similar instruments, i.a., it is not related to one single theoretical model and it measures a wide spectrum of psychosocial working conditions that have shown proven impact on health. The aim of the article is to summarize information on psychometric properties of 11 scales in the Polish version: Quantitative Demands, Emotional Demands, Influence at Work, Social Support, Possibilities for Development, Meaning of Work, Role Clarity, Quality of Leadership, Job Insecurity, Job Satisfaction, and General Health...
May 16, 2017: Medycyna Pracy
https://www.readbyqxmd.com/read/28512360/bullying-behavior-and-mental-health-in-healthcare-and-educational-sectors-in-kaunas-lithuania
#15
Lina Bernotaite, Vilija Malinauskiene, Palmira Leisyte
BACKGROUND: Investigations on workplace bullying in the countries of Eastern Europe are yet not too extensive. The aim of the study has been to identify the most frequent bullying behavior and to explore the associations with psychological distress and post-traumatic stress symptoms in 3 female-dominated occupations in Kaunas, Lithuania. MATERIAL AND METHODS: This crosssectional study employed 517 teachers (response rate (RR) = 71.3%), 174 family physicians (RR = 65...
May 16, 2017: Medycyna Pracy
https://www.readbyqxmd.com/read/28504360/oxygen-extraction-fraction-mapping-at-3-tesla-using-an-artificial-neural-network-a-feasibility-study
#16
Sebastian Domsch, Bettina Mürle, Sebastian Weingärtner, Jascha Zapp, Frederik Wenz, Lothar R Schad
PURPOSE: The oxygen extraction fraction (OEF) is an important biomarker for tissue-viability. MRI enables noninvasive estimation of the OEF based on the blood-oxygenation-level-dependent (BOLD) effect. Quantitative OEF-mapping is commonly applied using least-squares regression (LSR) to an analytical tissue model. However, the LSR method has not yet become clinically established due to the necessity for long acquisition times. Artificial neural networks (ANNs) recently have received increasing interest for robust curve-fitting and might pose an alternative to the conventional LSR method for reduced acquisition times...
May 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28503729/fully-integrated-3d-high-resolution-multicontrast-abdominal-pet-mr-with-high-scan-efficiency
#17
Christoph Kolbitsch, Radhouene Neji, Matthias Fenchel, Andrew Mallia, Paul Marsden, Tobias Schaeffter
PURPOSE: To provide 3D multicontrast anatomical MR with high isotropic resolution and metabolic positron emission tomography (PET) images using a respiratory motion-compensated simultaneous PET-MR examination with high scan efficiency. THEORY AND METHODS: Standard abdominal PET-MR examinations combine MR data obtained during multiple breath-holds with free-breathing PET acquisitions, limiting the achievable image resolution and potentially causing misalignment errors between breath-hold and free-breathing data...
May 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28498951/single-target-and-multiplex-discrimination-of-whiteflies-hemiptera-aleyrodidae-bemisia-tabaci-and-trialeurodes-vaporariorum-with-modified-priming-oligonucleotide-thermodynamics
#18
Sharon A Andreason, Mohammad Arif, Judith K Brown, Francisco Ochoa-Corona, Jacqueline Fletcher, Astri Wayadande
The whitefly species Bemisia tabaci (Gennadius) and Trialeurodes vaporariorum (Westwood) are worldwide agricultural pests and virus vectors. Bemisia tabaci, in particular, is often transported internationally via trade routes leading to potential introductions of exotic whiteflies or plant viruses. Quick identification of agriculturally important whiteflies can facilitate interventions that prevent these cross-border introductions. Polymerase chain reaction (PCR) primers were designed to amplify the mitochondrial cytochrome oxidase I gene (mtCOI) sequence of members of the B...
May 11, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28497643/three-dimensional-ultrashort-echo-time-mri-and-short-t2-images-generated-from-subtraction-for-determination-of-tumor-burden-in-lung-cancer-preclinical-investigation-in-transgenic-mice
#19
Andreas Müller, Philippe Jagoda, Peter Fries, Stefan Gräber, Robert Bals, Arno Buecker, Christopher Jungnickel, Christoph Beisswenger
PURPOSE: To investigate the potential of 3D ultrashort echo time MRI and short T2 images generated by subtraction for determination of total tumor burden in lung cancer. METHODS: As an animal model of spontaneously developing non-small cell lung cancer, the K-rasLA1 transgenic mouse was used. Three-dimensional MR imaging was performed with radial k-space acquisition and echo times of 20 µs and 1 ms. For investigation of the short T2 component in the recorded signal, subtraction images were generated from these data sets and used for consensus identification of tumors...
May 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28497622/non-contrast-enhanced-t1-weighted-mri-of-myocardial-radiofrequency-ablation-lesions
#20
Michael A Guttman, Susumu Tao, Sarah Fink, Aravindan Kolandaivelu, Henry R Halperin, Daniel A Herzka
PURPOSE: To demonstrate imaging of radiofrequency ablation lesions with non-contrast-enhanced T1 -weighted (T1w) MRI. METHODS: Fifteen swine underwent left ventricular ablation followed by MRI using different preparations: endocardial or epicardial ablation of naïve animal, or endocardial ablation of animal with myocardial infarction. Lesion imaging was performed using free-breathing, non-contrast-enhanced, T1w sequence with long inversion time (TI). Also acquired were T1 maps and delayed contrast-enhanced (DCE) imaging...
May 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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