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https://www.readbyqxmd.com/read/27910827/an-improved-asymmetric-gradient-coil-design-for-high-resolution-mri-head-imaging
#1
Fangfang Tang, Feng Liu, Fabio Freschi, Yu Li, Maurizio Repetto, Luca Giaccone, Yaohui Wang, Stuart Crozier
For head magnetic resonance imaging, local gradient coils are often used to achieve high solution images. To accommodate the human head and shoulder, the head gradient coils are usually designed in an asymmetric configuration, allowing the region-of-uniformity (ROU) close to the coil's patient end. However, the asymmetric configuration leads to technical difficulties in maintaining a high gradient performance for the insertable head coil with very limited space. In this work, we present a practical design configuration of an asymmetric insertable gradient head coil offering an improved performance...
December 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27910650/full-wave-feasibility-study-of-anti-radar-diagnostic-of-magnetic-field-based-on-o-x-mode-conversion-and-oblique-reflectometry-imaging
#2
Orso Meneghini, Francesco A Volpe
An innovative millimeter wave diagnostic is proposed to measure the local magnetic field and edge current as a function of the minor radius in the tokamak pedestal region. The idea is to identify the direction of minimum reflectivity at the O-mode cutoff layer. Correspondingly, the transmissivity due to O-X mode conversion is maximum. That direction, and the angular map of reflectivity around it, contains information on the magnetic field vector B at the cutoff layer. Probing the plasma with different wave frequencies provides the radial profile of B...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910318/physics-design-of-the-in-vessel-collection-optics-for-the-iter-electron-cyclotron-emission-diagnostic
#3
W L Rowan, S Houshmandyar, P E Phillips, M E Austin, J H Beno, A E Hubbard, A Khodak, A Ouroua, G Taylor
Measurement of the electron cyclotron emission (ECE) is one of the primary diagnostics for electron temperature in ITER. In-vessel, in-vacuum, and quasi-optical antennas capture sufficient ECE to achieve large signal to noise with microsecond temporal resolution and high spatial resolution while maintaining polarization fidelity. Two similar systems are required. One views the plasma radially. The other is an oblique view. Both views can be used to measure the electron temperature, while the oblique is also sensitive to non-thermal distortion in the bulk electron distribution...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27908105/role-of-sharp-avoided-crossings-in-short-hyper-radial-range-in-recombination-of-the-cold-4-he3-system
#4
Bin-Bin Wang, Yong-Chang Han, Shu-Lin Cong
The role of sharp avoided crossings (SACs) in a short hyper-radial range R≤ 50 a.u. in the calculation of recombination for a cold (4)He3 system is investigated in the adiabatic hyperspherical representation by "turning off and on" the relevant nonadiabatic couplings. The influence of SACs on the recombination is related with the channels of the system and with the scattering energy. For J(Π) = 0(+) symmetry, the two-body recombination channel has an attractive potential well, which makes radial wave functions of both two-body recombination channel and three-body continuum channels accessible in the short hyper-radial range where SACs are located...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27902608/transient-ulnar-artery-compression-facilitates-transradial-access
#5
Zhi-Ming Zhou, Zhen-Xian Yan, Bin Nie, Yong-He Guo, Yu-Jie Zhou
BACKGROUND: Unsuccessful radial artery puncture is one of the important causes of transradial procedure failure. Ulnar artery compression made the radial artery pulse stronger. Whether it would make transradial access easier, however, is uncertain. METHODS: A prospective randomized controlled trial was conducted among 446 patients who planned for transradial cardiac catheterization. Patients were randomized to receiving either transient ulnar artery compression (UC) or standard treatment (standard) for half an hour prior to needle insertion (217 UC, 229 standard)...
November 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27886825/antiplatelet-and-antithrombotic-therapy-in-patients-with-atrial-fibrillation-undergoing-coronary-stenting
#6
REVIEW
Mikhail S Dzeshka, Richard A Brown, Davide Capodanno, Gregory Y H Lip
Stroke prevention is the main priority in the management cascade of atrial fibrillation. Most patients require long-term oral anticoagulation (OAC) and may require percutaneous coronary intervention. Prevention of recurrent cardiac ischemia and stent thrombosis necessitate dual antiplatelet therapy (DAPT) for up to 12 months. Triple antithrombotic therapy with OAC plus DAPT of shortest feasible duration is warranted, followed by dual antithrombotic therapy of OAC and antiplatelet agent, and OAC alone after 12 months...
January 2017: Interventional cardiology clinics
https://www.readbyqxmd.com/read/27876066/in-vivo-cardiovascular-magnetic-resonance-of-2d-vessel-wall-diffusion-anisotropy-in-carotid-arteries
#7
Peter Opriessnig, Harald Mangge, Rudolf Stollberger, Hannes Deutschmann, Gernot Reishofer
BACKGROUND: Diffusion weighted (DW) cardiovascular magnetic resonance (CMR) has shown great potential to discriminate between healthy and diseased vessel tissue by evaluating the apparent diffusion coefficient (ADC) along the arterial axis. Recently, ex vivo studies on porcine arteries utilizing diffusion tensor imaging (DTI) revealed a circumferential fiber orientation rather than an organization in axial direction, suggesting dominant diffusion perpendicular to the slice direction. In the present study, we propose a method to access tangential and radial diffusion of carotids in vivo by utilizing a pulse sequence that enables high resolution DW imaging in combination with a two-dimensional (2D) diffusion gradient direction sampling scheme perpendicular to the longitudinal axis of the artery...
November 23, 2016: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/27873767/high-pressure-studies-with-x-rays-using-diamond-anvil-cells
#8
Guoyin Shen, Ho Kwang Mao
Pressure profoundly alters all states of matter. The symbiotic development of ultrahigh-pressure diamond anvil cells, to compress samples to sustainable multi-megabar pressures; and synchrotron x-ray techniques, to probe materials' properties in situ, has enabled the exploration of rich high-pressure (HP) science. In this article, we first introduce the essential concept of diamond anvil cell technology, together with recent developments and its integration with other extreme environments. We then provide an overview of the latest developments in HP synchrotron techniques, their applications, and current problems, followed by a discussion of HP scientific studies using x-rays in the key multidisciplinary fields...
November 22, 2016: Reports on Progress in Physics
https://www.readbyqxmd.com/read/27865181/radial-artery-diameter-does-not-correlate-with-body-mass-index-a-duplex-ultrasound-analysis-of-1706-patients-undergoing-trans-radial-catheterization-at-three-experienced-radial-centers
#9
Surya Dharma, Sasko Kedev, Tejas Patel, Sunil V Rao, Olivier F Bertrand, Ian C Gilchrist
BACKGROUND: We examined whether the radial artery diameter is correlated with body mass index (BMI) in patients undergoing transradial catheterization. METHODS: 1706 patients undergoing trans-radial catheterization at three experienced, high-volume, radial centers were analyzed. Radial and ulnar artery diameters were determined by ultrasound in the distal third of the forearm one day post procedure. Pearson correlation test was used to measure the relationship between continuous variables...
November 11, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27861170/monte-carlo-study-of-the-scattered-radiation-field-near-the-eyes-of-the-operator-in-interventional-procedures
#10
Paolo Ferrari, Frank Becker, Eleftheria Carinou, Vadim Chumak, Jad Farah, Zoran Jovanovic, Dragana Krstic, Artem Morgun, Sara Principi, Pedro Teles
Interventional radiology and cardiology guarantee high benefits for patients, but are known to be associated with a high level of radiation exposure of medical staff. The recently suggested decrease of the annual dose limit for the eye lens, from 150 to 20 mSv, caused a need for a reconsideration of practices ensuring sufficient protection for the lens of the eyes of medical staff. In such context the study of the scattered radiation around the operator's head could help in finding the best solutions to be adopted for the ceiling-suspended shield and lead glasses in the most common situations in interventional practices...
November 18, 2016: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/27860277/comparison-of-transradial-and-transfemoral-access-in-patients-undergoing-percutaneous-coronary-intervention-for-complex-coronary-lesions
#11
Edward Koifman, Michael A Gaglia, Ricardo O Escarcega, Nelson L Bernardo, Robert A Lager, Robert A Gallino, Itsik Ben-Dor, Augusto D Pichard, Nevin C Baker, Michael J Lipinski, Sarkis Kiramijyan, Smita I Negi, Rebecca Torguson, Jiaxiang Gai, William O Suddath, Lowell F Satler, Ron Waksman
OBJECTIVE: Comparison of transradial versus transfemoral access for complex percutaneous coronary intervention (PCI) with regard to both complications and long-term outcomes. BACKGROUND: Radial access has been shown to confer superior results in patients undergoing PCI, especially in patients with acute coronary syndromes. However, radial access has limitations of sheath and device size, which may increase procedure time and result in inferior outcomes. METHODS: Patients undergoing PCI for complex lesions, defined as type C according the ACC/AHA classification system, were included in this study...
November 10, 2016: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/27845507/updates-on-radial-approach-for-percutaneous-coronary-intervention-in-patients-with-chronic-total-occlusion
#12
Lazzaro Paraggio, Francesco Burzotta, Cristina Aurigemma, Carlo Trani
INTRODUCTION: Radial approach is the emerging arterial access for percutaneous coronary interventions (PCIs) in patients with coronary artery disease. EVIDENCE ACQUISITION: Among the different subset of complex targets for PCI, chronic total occlusion (CTO) still represent a challenge for the interventional cardiologist. Is radial approach suitable for PCI on CTO? A series of data collected in selected centres with high volume of transradial procedures supported the change from elective transfemoral approach to systematic transradial approach...
November 15, 2016: Minerva Cardioangiologica
https://www.readbyqxmd.com/read/27842902/pseudoaneurysm-after-transpedal-arterial-access-for-evaluation-and-treatment-of-peripheral-arterial-disease
#13
Apurva Patel, Roosha Parikh, Yili Huang, Michael Liou, Justin Ratcliffe, Olivier F Bertrand, Joseph Puma, Tak W Kwan
BACKGROUND: There has been an increasing use of transpedal arterial access (TPA) for evaluation and treatment of peripheral arterial disease (PAD) over a transfemoral approach (TFA). TPA, it is expected to be associated with better patient comfort, less recovery time and possibly less access site complications compared to standard TFA. Access site complications and pseudoaneurysm (PSA) associated with the TPA have not been previously reported. OBJECTIVE: Here we report a series of pedal artery PSA related to access site complicating TPA catheterization...
October 17, 2016: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/27830459/comparison-of-radial-brachial-and-femoral-accesses-using-hemostatic-devices-for-percutaneous-coronary-intervention
#14
Masaya Otsuka, Nobuo Shiode, Yasuhisa Nakao, Yuki Ikegami, Yusuke Kobayashi, Arinori Takeuchi, Ayako Harima, Tadanao Higaki, Kuniomi Oi, Kazuoki Dai, Tomoharu Kawase, Yasuharu Nakama, Kazuyoshi Suenari, Kenji Nishioka, Koyu Sakai, Yuji Shimatani, Yoshiko Masaoka, Ichiro Inoue
Some studies have suggested that radial access (RA) for percutaneous coronary intervention (PCI) reduces vascular complications and bleeding compared to femoral access (FA). The purpose of this study was to investigate the routine use of hemostatic devices and bleeding complications among RA, brachial access (BA), and FA. Between January 2015 and December 2015, 298 patients treated for PCI with RA were compared with 158 patients using BA and 206 patients using FA. The radial sheath was routinely removed with ADAPTY, the brachial sheath with BLEED SAFE, and the femoral sheath with Perclose ProGlide...
November 9, 2016: Cardiovascular Intervention and Therapeutics
https://www.readbyqxmd.com/read/27824735/surgical-treatment-of-chronic-essex-lopresti-lesion-interosseous-membrane-reconstruction-and-radial-head-prosthesis
#15
Prospero Bigazzi, Letizia Marenghi, Marco Biondi, Maura Zucchini, Massimo Ceruso
The Essex-Lopresti lesion, or radioulnar longitudinal dissociation, results from an axial load to the forearm with lesion to the radial head, interosseous membrane and distal radioulnar joint. The lesion is rarely diagnosed early, therefore treatment is often subacute or chronic. In these cases, procedures such as radial head replacement, ulnar shortening and/or wafer procedures should be combined with reconstruction of the interosseous membrane central band to restore longitudinal stability of the forearm...
November 7, 2016: Techniques in Hand & Upper Extremity Surgery
https://www.readbyqxmd.com/read/27823682/influence-of-access-site-choice-for-cardiac-catheterization-on-risk-of-adverse-neurological-events-a-systematic-review-and-meta-analysis
#16
Alex Sirker, Chun Shing Kwok, Rafail Kotronias, Rodrigo Bagur, Olivier Bertrand, Robert Butler, Colin Berry, James Nolan, Keith Oldroyd, Mamas A Mamas
BACKGROUND: Stroke is a rare but potentially catastrophic complication of cardiac catheterization. Although some procedural aspects are known to influence stroke risk, the impact of radial versus femoral access site use is unclear. Early observational studies and limited randomized trial data suggested more frequent embolic events with radial access. Subsequently, larger pooled analyses have shown no clear differences in stroke risk but were limited by low event rates. Recent publication of relevant new data prompted our reevaluation of this concern...
November 2016: American Heart Journal
https://www.readbyqxmd.com/read/27816175/-transfemoral-tavi-procedure-in-women-minimally-invasive-technique
#17
H Benamer, B Chevalier, A Roy, M A Bouzid, C Perdrix, P Garot, T Hovasse, T Unterseeh, S Champagne, T Lefèvre
Demographic data point to a substantial proportion of women in the population of elderly patients with an increasing prevalence of aortic stenosis. Implantation of an aortic bioprosthesis via an endovascular approach known as Transcatheter aortic valve implantation (TAVI) in patients presenting with a symptomatic tight aortic stenosis (severe aortic stenosis) (AS) is an alternative therapeutic option to surgical aortic valve replacement in patients at high surgical risk or ineligible for surgery. The literature has shown that this technique seems to be particularly beneficial in female patients...
November 2, 2016: Annales de Cardiologie et D'angéiologie
https://www.readbyqxmd.com/read/27809962/gaining-a-new-skill-with-the-risk-of-losing-one-the-effect-of-radial-catheterization
#18
Oluwaseyi Bolorunduro, Tamunoinemi Bob-Manuel, Yaser Cheema, Askari Raza, Rami Khouzam
The adoption of radial catheterization has been relatively slow in the United States. This study was conducted to assess the perceived comfort level of cardiology fellows with radial catheterizations and to predict the practice patterns in the United States in the near future. A 21-question survey on cardiology fellows' preferred cardiac catheterization access site was conducted between April and June 2015. Data on access preference and perceived competency were analyzed based on the fellow's level of training and type of training program (university vs community)...
May 2016: Current Problems in Cardiology
https://www.readbyqxmd.com/read/27808484/transradial-arterial-access-catheter-knots-a-review-article-and-a-proposed-treatment-algorithm
#19
George Kassimis, Athansios Pantos, Gianluigi Orgera, Miltiadis Krokidis
Transradial access for percutaneous coronary and non-coronary intervention has gained worldwide acceptance. This approach has demonstrated less bleeding and vascular events with a reduced in-hospital stay, and an improvement in clinical outcomes when compared to the traditional transfemoral approach. However, this strategy may occasionally lead to severe catheter kinking and further manipulation may be required to unravel the catheter and avoid complication. Purpose of this review article is to present the current knowledge and evidence in preventing and potentially resolving issues related to radial access catheter knots...
November 3, 2016: Minerva Cardioangiologica
https://www.readbyqxmd.com/read/27803954/clinical-outcomes-of-femoral-closure-compared-to-radial-compression-devices-following-percutaneous-coronary-intervention-the-ferari-study
#20
Christian Fastner, Michael Behnes, Melike Ünsal, Ibrahim El-Battrawy, Uzair Ansari, Kambis Mashayekhi, Ursula Hoffmann, Siegfried Lang, Jürgen Kuschyk, Martin Borggrefe, Ibrahim Akin
: This study aims to compare prospectively the differences of clinical outcomes being associated with a specific femoral closure (FC) compared to a radial compression (RC) device following percutaneous coronary interventions (PCI). This single-center, prospective observational study included consecutively 400 patients either treated by a specific FC (Angio-Seal™, St. Jude Medical, Inc., St. Paul, MN) or RC (TR Band(®), Terumo Corporation, Tokyo, Japan) device following PCI. The primary outcome was to evaluate overall, access site and non-access site bleedings, the secondary outcome was major adverse cardiac events (MACE) occurring within 30 days of follow-up...
November 1, 2016: Heart and Vessels
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