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https://www.readbyqxmd.com/read/29147735/reduction-of-metallic-artifacts-of-the-post-treatment-intracranial-aneurysms-effects-of-single-energy-metal-artifact-reduction-algorithm
#1
Yu-Ning Pan, Ge Chen, Ai-Jing Li, Zhao-Qian Chen, Xiang Gao, Yi Huang, Bradley Mattson, Shan Li
PURPOSE: This study evaluated the quality of computed tomography (CT) and CT angiography images generated using the single-energy metal artifact reduction (SEMAR) algorithm during perfusion examination in patients who had undergone reconstruction with neurosurgical clipping or endovascular coiling for treatment of aneurysms. METHODS: A total of 55 patients with implanted intracranial clips or coils (24 men and 31 women; mean age 60.15 ± 15.86 years) underwent perfusion studies evaluated by CT and CT angiography with a 320-row CT scanner...
November 16, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29146831/stent-assisted-coiling-of-cerebral-aneurysms-a-single-center-clinical-and-angiographic-analysis
#2
Jun Wang, Jan Vargas, Alejandro Spiotta, Imran Chaudry, Raymond D Turner, Jonathan Lena, Aquilla Turk
OBJECTIVE: This study retrospectively compared the clinical and angiographic outcomes of treating cerebral aneurysms with Neuroform (NEU), Enterprise (EP), and Low-profile Visualized Intraluminal Support (LVIS/LVIS Jr) stents. MATERIALS AND METHODS: We conducted a retrospective analysis of a procedural database. All aneurysm procedures using any of the three types of self-expanding nitinol stents (NEU, EP and LVIS/LVIS Jr) were included. Intra-procedure complications, post-procedure complications, and angiographic results (Raymond-Roy grade scale, RRGS) were analyzed retrospectively...
November 16, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29143987/effect-of-body-temperature-on-the-pharmacokinetics-of-a-triarylmethyl-type-paramagnetic-contrast-agent-used-in-epr-oximetry
#3
Ken-Ichiro Matsumoto, Fuminori Hyodo, James B Mitchell, Murali C Krishna
PURPOSE: Pharmacokinetics of the tri[8-carboxy-2,2,6,6-tetrakis(2-hydroxymethyl)benzo[1,2-d:4,5-d']bis(1,3)dithio-4-yl]methyl radical (Oxo63) after a single bolus and/or continuous intravenous infusion was investigated in tumor-bearing C3H mice with or without body temperature control while under anesthesia. METHOD: The in vivo time course of Oxo63 in blood was measured using X-band electron paramagnetic resonance spectroscopy. Distribution of Oxo63 in normal muscle and tumor tissues was obtained using a surface coil resonator and a 700-MHz electron paramagnetic resonance spectrometer...
November 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29142623/simple-coiling-versus-stent-assisted-coiling-of-paraclinoid-aneurysms-radiological-outcome-in-a-single-center-study
#4
Soo Yeon Kim, Dong Sun Park, Hye Yin Park, Young Il Chun, Chang Taek Moon, Hong Gee Roh
Objective: Paraclinoid aneurysms are a group of aneurysms arising at the distal internal carotid artery. Due to a high incidence of small, wide-necked aneurysms in this zone, it is often challenging to achieve complete occlusion when solely using detachable coils, thus stent placement is often required. In the present study, we aimed to investigate the effect of stent placement in endovascular treatment of paraclinoid aneurysms. Methods: Data of 98 paraclinoid aneurysms treated by endovascular approach in our center from August 2005 to June 2016 were retrospectively reviewed...
November 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/29135327/coil-localization-guided-video-assisted-thoracoscopic-surgery-for-lung-nodules
#5
Yu-Fei Fu, Miao Zhang, Wen-Bin Wu, Tao Wang
PURPOSE: To determine the clinical efficacy of preoperative coil localization-guided video-assisted thoracoscopic surgery (VATS) for lung nodules. MATERIALS AND METHODS: Between November 2015 and July 2017, 56 patients with lung nodules underwent coil localization-guided VATS procedure. The coil implantation was performed under the guidance of computed tomography (CT). The end tail of the coil remained above the visceral pleura. The target lung nodules were removed by VATS wedge resection...
November 14, 2017: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
https://www.readbyqxmd.com/read/29131633/effect-of-the-helix-coil-transition-in-bovine-skin-gelatin-on-its-associative-phase-separation-with-lysozyme
#6
Yurij A Antonov, Irina Zhuravleva, Alexander Volodine, Paula Moldenaers, Ruth Cardinaels
It is known that the formation of electrostatic polyelectrolyte complexes can induce conformational changes in the interacting macromolecules. However, the opposite effect, namely, that of the helix-coil transition of one of the interacting polyelectrolytes on its associative phase separation with another polyelectrolyte and the possible phase transitions in such systems, has not been determined. Atomic force and confocal laser scanning microscopy, phase analysis, dynamic and electrophoretic light scattering, turbidimetry, absorption, and fluorescence measurements as well as differential scanning calorimetry and rheology were used to study the effect of the helix-coil transition in bovine skin gelatin (Gel) on its associative phase separation with hen egg white lysozyme (Lys) at different temperatures (18-40 °C) and various Lys/Gel weight ratios (0...
November 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29130091/donor-acceptor-interaction-driven-self-assembly-of-amphiphilic-rod-coil-molecules-into-supramolecular-nanoassemblies
#7
Shengsheng Yu, Yuntian Yang, Tie Chen, Jingzhe Xu, Long Yi Jin
Rigid-flexible amphiphilic molecules consisting of an aromatic segment based on pyrene and biphenyl units and hydrophilic polyethylene oxide chains self-assemble into lamellar, hexagonal columnar, and two-dimensional columnar nanostructures in the bulk state. In aqueous solution, these molecules self-assemble into nanofibers, spherical micelles, and multilayer nanotubes, depending on the chain or rod length of the molecules. Notably, ordered nanostructures of supramolecular polymers, such as single-layer curving fragments, nanofibers, and nanosheets, were constructed through charge-transfer interactions between the nanoobjects and an electron-acceptor molecule, 2,4,5,7-tetranitrofluorenone...
November 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/29119185/polymer-conformation-during-flow-in-porous-media
#8
Durgesh Kawale, Gelmer Bouwman, Shaurya Sachdev, Pacelli L J Zitha, Michiel T Kreutzer, William R Rossen, Pouyan E Boukany
Molecular conformations of individual polymers during flow through porous media are directly observed by single-DNA imaging in microfluidics. As the Weissenberg number increases during flow (Wi > 1), we observe two types of elastic instabilities: (a) stationary dead-zone and (b) time-dependant dead-zone washing. When stretched polymer chains enter a dead-zone, they first re-coil and, once inside the dead-zone, they rotate and re-stretch again. The probability distribution of DNA chains under the stretched condition inside the dead-zone is found to be heterogeneous with a broad distribution...
November 9, 2017: Soft Matter
https://www.readbyqxmd.com/read/29118794/safety-and-efficacy-of-low-profile-self-expandable-stents-for-treatment-of-intracranial-aneurysms-initial-and-midterm-results-a-systematic-review-and-meta-analysis
#9
Su-Yeon Park, Jae-Sang Oh, Hyuk-Jin Oh, Seok-Mann Yoon, Hack-Gun Bae
Low-profile stents seem to be associated with a higher incidence of thromboembolic events compared with preexisting stents. We conducted a systematic review of 11 eligible reports and a meta-analysis of 7 reports with respect to the clinical efficacy and safety of low-profile stents. There were 217 intracranial aneurysms reported; 22% were ruptured aneurysms. In all, 72% were treated using single stenting, 19% were treated using overlapping stenting, and 6% were treated using balloon angioplasty followed by stenting; 3% were used to assess the flow diverter effect in a dissecting aneurysm or were treated using unexpected subtotal coil packing...
October 2017: Interventional Neurology
https://www.readbyqxmd.com/read/29118790/rescue-treatment-with-pipeline-embolization-for-postsurgical-clipping-recurrences-of-anterior-communicating-artery-region-aneurysms
#10
Li-Mei Lin, Rajiv R Iyer, Matthew T Bender, Thomas Monarch, Geoffrey P Colby, Judy Huang, Rafael J Tamargo, Alexander L Coon
Background: Postsurgical clipping aneurysm recurrences or residuals can be difficult to manage with either traditional open microsurgical approaches or endosaccular coiling. Endoluminal parent vessel reconstruction with flow diversion may be an ideal method for treating these recurrences by avoiding reoperative surgery or intraprocedural aneurysm rupture with aneurysm access. Method: We retrospectively reviewed a single-center aneurysm database identifying all anterior communicating artery (ACom) region aneurysms with recurrences after microsurgical clipping...
October 2017: Interventional Neurology
https://www.readbyqxmd.com/read/29118789/anterior-communicating-artery-aneurysm-treatment-with-the-pipeline-embolization-device-a-single-center-experience-with-long-term-follow-up
#11
Ali Sultan-Qurraie, Ahsan Sattar, Wled Wazni, Mazen Noufal, Osama Zaidat
Introduction: The pipeline embolization device (PED) is increasingly used in the endovascular management of cerebral aneurysms. Longitudinal data regarding safety and benefit of the PED in anterior communicating (ACOM) artery aneurysms are limited and particularly lacking in residual ACOM artery aneurysms. We report the use of the PED in 3 patients with ACOM artery aneurysms who were previously coiled. Methods: Three patients with ACOM artery aneurysms, all previously treated with coiling and with recurrence of the aneurysm neck, were treated with the PED...
October 2017: Interventional Neurology
https://www.readbyqxmd.com/read/29116602/arterial-embolizations-with-microvascular-plug-in-extracranial-and-intracranial-districts-technical-results
#12
Francesco Giurazza, Fabio Corvino, Errico Cavaglià, Gianluca Cangiano, Francesco Amodio, Giuseppe De Magistris, Giulia Frauenfelder, Gianluigi Guarnieri, Mario Muto, Raffaella Niola
PURPOSE: A new detachable microvascular plug (MVP, Reverse Medical(®), Irvine, CA, USA) has been recently developed; three models are available according to the size (MVP3-MVP5-MVP7). MVP3 and MVP5 are released through a 0.027″ microcatheter, MVP7 through a 4 Fr catheter. This series aims to describe an initial single-center experience examining intraprocedural safety and technical success of MVP. MATERIALS AND METHODS: Ten patients (mean age 55.1 years) have been treated for arterial embolization using MVP; eight extracranial and two intracranial arterial embolizations have been performed...
November 7, 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/29115689/learning-a-variational-network-for-reconstruction-of-accelerated-mri-data
#13
Kerstin Hammernik, Teresa Klatzer, Erich Kobler, Michael P Recht, Daniel K Sodickson, Thomas Pock, Florian Knoll
PURPOSE: To allow fast and high-quality reconstruction of clinical accelerated multi-coil MR data by learning a variational network that combines the mathematical structure of variational models with deep learning. THEORY AND METHODS: Generalized compressed sensing reconstruction formulated as a variational model is embedded in an unrolled gradient descent scheme. All parameters of this formulation, including the prior model defined by filter kernels and activation functions as well as the data term weights, are learned during an offline training procedure...
November 8, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29112819/humidity-and-sunlight-driven-motion-of-a-chemically-bonded-polymer-bilayer-with-programmable-surface-patterns
#14
Lidong Zhang, Xiaxin Qiu, Yihui Yuan, Ting Zhang
We report a bilayer of sodium alginate/polyvinylidene fluoride (SA/PVDF) that is chemically bonded through a series of interfacial coupling reactions. The SA layer is hydrophilic in structure and is capable of strong interaction with water molecules, thus presenting high sensitivity to humidity, whereas the PVDF layer is hydrophobic, inert to humidity. This structural feature results in the bilayer having asymmetric humidity-responsive performances that can thus make its shape change with directionality, which cannot be achieved in an SA single layer...
November 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29110240/manipulating-transmit-and-receive-sensitivities-of-radiofrequency-surface-coils-using-shielded-and-unshielded-high-permittivity-materials
#15
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/29109419/metal-solidification-imaging-process-by-magnetic-induction-tomography
#16
Lu Ma, Stefano Spagnul, Manuchehr Soleimani
There are growing number of important applications that require a contactless method for monitoring an object surrounded inside a metallic enclosure. Imaging metal solidification is a great example for which there is no real time monitoring technique at present. This paper introduces a technique - magnetic induction tomography - for the real time in-situ imaging of the metal solidification process. Rigorous experimental verifications are presented. Firstly, a single inductive coil is placed on the top of a melting wood alloy to examine the changes of its inductance during solidification process...
November 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29107755/interaction-between-shock-coils-increased-the-incidence-of-inappropriate-therapies-and-lead-failure-in-implantable-cardioverter-defibrillator
#17
Mohammad El Garhy, Marc-Alexander Ohlow, Bernward Lauer
AIMS: Shock coil interaction in patients with multiple implantable cardioverter defibrillator (ICD) leads is occasionally observed. We aimed to evaluate the incidence of shock coil interaction and its clinical relevance. METHODS AND RESULTS: All ICD patients (646 patients) who came to follow up control in our ICD ambulance between January 1, 2011, and December 31, 2011 in the department of cardiology in Bad Berka hospital were retrospectively evaluated in this study...
October 28, 2017: Indian Pacing and Electrophysiology Journal
https://www.readbyqxmd.com/read/29106636/endovascular-coil-retrieval-using-dual-synchronous-solitaire-revascularization-devices
#18
John D Nerva, Ryan P Morton, Cory M Kelly, Danial K Hallam, Michael R Levitt
BACKGROUND AND IMPORTANCE: Coil migration is a potential complication of endovascular aneurysm treatment. Dislodged coils into the parent artery require retrieval to prevent thromboembolic complications. A variety of techniques for coil retrieval have been described, including the use of single stentrievers and aspiration catheters. CLINICAL PRESENTATION: The use of 2 stentrievers, as opposed to a single device, was thought to be advantageous in coil removal by the additional point of friction due to the extensive length of coil stretching and earlier failure of a single device...
November 2, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29103275/new-record-of-aspidogaster-ijimai-kawamura-1913-trematoda-aspidogastridae-from-cyprinus-carpio-in-korea
#19
Dongmin Lee, Hansol Park, Seongjun Choe, Yeseul Kang, Hyeong-Kyu Jeon, Keeseon S Eom
Aspidogastrid trematodes (Subclass Aspidogastrea) are a relatively small group with a characteristic adhesive disc and parasitize in a variety of cold-blooded hosts. Until now, only 2 species in the genus Cotylaspis, i.e., C. coreensis and C. sinensis, have been reported as the aspidogastrid trematode in the Republic of Korea (=Korea). In the present study, we intended to describe a species of aspidogastrids collected from the small intestine of the common carp, Cypri-nus carpio, in a faunistic point of view...
October 2017: Korean Journal of Parasitology
https://www.readbyqxmd.com/read/29102748/an-evaluation-of-commonly-used-external-ventricular-drain-securement-metho-ds-in-a-porcine-model-recommendations-to-improve-practise
#20
Danyal Akarca, Andrew J Durnford, Frederick G Ewbank, Jonathan Hempenstall, Ahmed R Sadek, Anthony E Gould, Diederik O Bulters
BACKGROUND: External ventricular drain (EVD) dislodgement is common and leads to significant morbidity and mortality. Many securement techniques to prevent this are described. There are, however, no objective studies comparing them. This study aimed to determine the most secure method of securing an EVD. METHODS: A survey was distributed through the British Neurosurgical Trainee Research Collaborative (BNTRC) to determine common EVD securement methods and select techniques for testing...
November 1, 2017: World Neurosurgery
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