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https://www.readbyqxmd.com/read/28520916/a-comparison-of-diffusion-weighted-imaging-abnormalities-following-balloon-remodeling-for-aneurysm-coil-embolization-in-the-ruptured-vs-unruptured-setting
#1
Stephen R Lowe, Tarun Bhalla, Holly Tillman, M Imran Chaudry, Aquilla S Turk, Raymond D Turner, Alejandro M Spiotta
BACKGROUND: The prothrombotic milieu seen in subarachnoid hemorrhage (SAH) poses a unique challenge to neurovascular surgeons with regard to device use and microcatheter practice. OBJECTIVE: To determine how demographic factors and balloon practices impact diffusion-weighted imaging (DWI) abnormalities and outcomes in patients with SAH compared to those without (non-SAH). METHODS: We retrospectively analyzed 77 patients with SAH treated by balloon-assisted coiling in a single institution compared with 81 consecutive patients with unruptured aneurysms treated by balloon-assisted coiling at the same institution...
May 17, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28516045/exploration-of-highly-accelerated-magnetic-resonance-elastography-using-high-density-array-coils
#2
John C Bosshard, Naresh Yallapragada, Mary P McDougall, Steven M Wright
BACKGROUND: Magnetic resonance elastography (MRE) measures tissue mechanical properties by applying a shear wave and capturing its propagation using magnetic resonance imaging (MRI). By using high density array coils, MRE images are acquired using single echo acquisition (SEA) and at high resolutions with significantly reduced scan times. METHODS: Sixty-four channel uniplanar and 32×32 channel biplanar receive arrays are used to acquire MRE wave image sets from agar samples containing regions of varying stiffness...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28514360/-preoperative-mri-diagnostics-of-the-topographic-features-of-neck-arteries-in-the-patients-presenting-with-chronic-tonsillitis
#3
A I Kryukov, G Yu Tsarapkin, A A Ivanchikov, A S Tovmasyan, I G Kolbanova, S G Arzamazov, S A Panasov, E V Gorovaya, A S Kakorin
The objective of the present study was to determine the frequency of abnormalities of the major neck vessels and elucidate the specific features of blood supply of palatine tonsil based on the results of MRI performed in the vasculature-targeting regimen. A total of 109 patients presenting with chronic tonsillitis (including 64 women and 45 men at the age varying from 15 to 54 years) were available for the examination. All the patients underwent the MRI diagnostic study of the neck vessels by way of the preliminary evaluation of their condition at the pre-hospital stage...
2017: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/28512095/structure-based-mutations-in-the-herpes-simplex-virus-1-glycoprotein-b-ectodomain-arm-impart-a-slow-entry-phenotype
#4
Qing Fan, Sarah J Kopp, Sarah A Connolly, Richard Longnecker
Glycoprotein B (gB) is the conserved herpesvirus fusion protein, and it is required for the entry of herpesviruses. The structure of the postfusion conformation of gB has been solved for several herpesviruses; however, the gB prefusion crystal structure and the details of how the protein refolds from a prefusion to a postfusion form to mediate fusion have not been determined. Using structure-based mutagenesis, we previously reported that three mutations (I671A, H681A, and F683A) in the C-terminal arm of the gB ectodomain greatly reduced cell-cell fusion...
May 16, 2017: MBio
https://www.readbyqxmd.com/read/28507677/pentafluorobenzene-end-group-as-a-versatile-handle-for-para-fluoro-click-functionalization-of-polythiophenes
#5
Pierre Boufflet, Abby Casey, Yiren Xia, Paul N Stavrinou, Martin Heeney
A convenient method of introducing pentafluorobenzene (PFB) as a single end-group in polythiophene derivatives is reported via in situ quenching of the polymerization. We demonstrate that the PFB-group is a particularly useful end-group due to its ability to undergo fast nucleophilic aromatic substitutions. Using this molecular handle, we are able to quantitatively tether a variety of common nucleophiles to the polythiophene backbone. The mild conditions required for the reaction allows sensitive functional moieties, such as biotin or a cross-linkable trimethoxysilane, to be introduced as end-groups...
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28507241/an-amino-acid-substitution-in-rna-polymerase-that-inhibits-the-utilization-of-an-alternative-sigma-factor
#6
Anna F Wang Erickson, Padraig Deighan, Cinthia P Garcia, Robert O J Weinzierl, Ann Hochschild, Richard Losick
Sigma (σ) factors direct gene transcription by binding to and determining the promoter recognition specificity of RNA polymerase (RNAP) in bacteria. Genes transcribed under the control of alternative sigma factors allow cells to respond to stress and undergo developmental processes such as sporulation in Bacillus subtilis, in which gene expression is controlled by a cascade of alternative sigma factors. Binding of sigma factors to RNA polymerase depends on the coiled-coil (or clamp helices) motif of the β' subunit...
May 15, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28503145/a-neural-dynamic-architecture-for-concurrent-estimation-of-object-pose-and-identity
#7
Oliver Lomp, Christian Faubel, Gregor Schöner
Handling objects or interacting with a human user about objects on a shared tabletop requires that objects be identified after learning from a small number of views and that object pose be estimated. We present a neurally inspired architecture that learns object instances by storing features extracted from a single view of each object. Input features are color and edge histograms from a localized area that is updated during processing. The system finds the best-matching view for the object in a novel input image while concurrently estimating the object's pose, aligning the learned view with current input...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28498307/an-improved-design-of-the-spiral-coil-emat-for-enhancing-the-signal-amplitude
#8
Xiaojuan Jia, Qi Ouyang, Xinglan Zhang
The low energy transition efficiency of electromagnetic ultrasonic transducer (EMAT) is a common problem in practical application. For the purpose of enhancing the amplitude of the received signal, an improved double-coil bulk wave EMAT is proposed for the thickness measurement of metallic block. This new configuration of magnets consists of a solid cylindrical magnet and a ring-shaped magnet encircling the outer side of the solid cylindrical one. A double-coil was applied instead of a single spiral-coil. Numerical simulations were performed to analyze and optimize the proposed configuration of the EMAT by the 2-D axisymmetric finite element model (FEM)...
May 12, 2017: Sensors
https://www.readbyqxmd.com/read/28491182/aortoenteric-fistulae-temporization-and-treatment-lessons-learned-from-a-multidisciplinary-approach-to-3-patients
#9
Jeffrey Forris Beecham Chick, Jordan C Castle, Kyle J Cooper, Ravi N Srinivasa, Jonathan L Eliason, Nicholas H Osborne, Karen M Kim, Wael E Saad, Minhaj S Khaja
Aortoenteric fistulae are life-threatening conditions characterized by abnormal communications between the aorta and gastrointestinal tract. Aortoenteric fistulae may be characterized by the triad of bleeding, abdominal pain, or a pulsatile abdominal mass. Although hemorrhage is the most common presentation, it does not always occur; thus, patients may present with nonspecific symptoms. Computed tomography angiography findings suggestive of aortoenteric fistulae include ectopic gas within or adjacent to the aorta, discontinuity of the aortic wall, bowel wall thickening, and extravasation of contrast into the bowel...
June 2017: Radiology case reports
https://www.readbyqxmd.com/read/28490134/changes-in-the-structure-and-dissociation-of-soybean-protein-isolate-induced-by-ultrasound-assisted-acid-pretreatment
#10
Liurong Huang, Xiaona Ding, Chunhua Dai, Haile Ma
Structure and dissociation properties of soybean protein isolate (SPI) induced by ultrasound and acid were investigated. Results of solubility showed that ultrasound-assisted acid had no effect on the content of soluble aggregates in SPI. Increase of fluorescence intensity and red-shift of maximum emission wavelength indicated that acid induced molecular unfolding of SPI and exposure of hydrophobic groups. Circular dichroism spectra showed that ultrasound-assisted acid pretreatment resulted in increases in the α-helix content by 29...
October 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28488274/quantitative-single-breath-hold-renal-arterial-spin-labeling-imaging-at-7t
#11
Xiufeng Li, Edward J Auerbach, Pierre-Francois Van de Moortele, Kamil Ugurbil, Gregory J Metzger
PURPOSE: To evaluate the feasibility of quantitative single breath-hold renal arterial spin labeling (ASL) imaging at 7T. METHODS: A single-shot fast spin echo FAIR (flow-sensitive alternating inversion recovery) method was used to perform two studies. First, a multi-delay perfusion study was performed to estimate the spin labeling temporal bolus width achievable with a local transceiver array coil at 7T. Second, with a conservatively defined bolus width, a quantitative perfusion study was performed using the single subtraction approach...
May 9, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28488167/a-generic-label-free-microfluidic-microobject-sorter-using-a-magnetic-elastic-diverter
#12
Jiachen Zhang, Onaizah Onaizah, Amir Sadri, Eric Diller
Cell sorters play important roles in biological and medical applications, such as cellular behavior study and disease diagnosis and therapy. This work presents a label-free microfluidic sorter that has a downstream-pointing magnetic elastic diverter. Different with most existing magnetic sorters, the proposed device does not require the target microobjects to be intrinsically magnetic or coated with magnetic particles, giving users more flexibility in sorting criteria. The diverter is wirelessly deformed by an applied magnetic field, and its deformation induces a fluid vortex that sorts incoming microobjects, e...
June 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28479464/embo-evar-a-technique-to-prevent-type-ii-endoleak-a-single-centre-experience
#13
Massimiliano Natrella, Federico Navarretta, Alessandro Rapellino, Gianluca Job, Massimo Cristoferi, Matteo Castagnola, Gianmarco Lunardi, Luca Duc, Gianluca Fanelli, Andrea Peruzzo Cornetto, Teodoro Meloni, Flavio Peinetti
OBJECTIVES: To evaluate the role of intraprocedural aneurysm sac embolisation (embo-EVAR) during endovascular abdominal aneurysm repair (EVAR) using coils and fibrin glue for preventing type II endoleak (EII). MATERIALS AND METHODS: A retrospective clinical case analysis of 72 patients who underwent EVAR during the period 2011-2014. Two groups were compared at 6 and 12 months follow-up with MDCT scan and Contrast-enhanced ultrasound (CEUS) imaging: consecutively, 36 patients (group A) treated with classic EVAR and 36 patients (group B) treated with embo-EVAR...
May 4, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28475050/development-of-a-mechanical-scanning-device-with-high-frequency-ultrasound-transducer-for-ultrasonic-capsule-endoscopy
#14
Xingying Wang, Vipin Seetohul, Ruimin Chen, Ming Qian, Congzhi Wang, Zhihong Huang, Qifa Zhou, Hairong Zheng, Sandy Cochran, Weibao Qiu
Wireless capsule endoscopy has opened a new era by enabling remote diagnostic assessment of the gastrointestinal (GI) tract in a painless procedure. Video capsule endoscopy (VCE) is currently commercially available worldwide. However, it is limited to visualization of superficial tissue. Ultrasound (US) imaging is a complementary solution as it is capable of acquiring transmural information from the tissue wall. This paper presents a mechanical scanning device incorporating a high-frequency transducer specifically as a proof of concept for ultrasound capsule endoscopy (USCE), providing information that may usefully assist future research...
May 2, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28457931/factors-affecting-the-obliteration-rate-of-intracranial-aneurysms-treated-with-a-single-pipeline-embolization-device
#15
Hanieh Moshayedi, Oluwaseun A Omofoye, Edward Yap, Taofik O Oyekunle, Deanna M Sasaki-Adams, Sten Y Solander
OBJECTIVE: To evaluate the clinical and angiographic outcomes of intracranial aneurysm treatment using a single Pipeline Embolization Device (PED), and to evaluate the factors affecting aneurysm obliteration rate. METHODS: The demographic characteristics and anatomical features of 58 aneurysms in 47 patients treated with a single Pipeline embolization device were reviewed retrospectively. All aneurysms treated with one PED at a single center, and with follow-up angiograms of at least six months were included in this study...
April 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28456735/aneurysms-of-the-proximal-segment-of-the-anterior-cerebral-artery-a-new-classification-system-with-corresponding-therapeutic-options
#16
Xinmin Ding, Peyton Lubbock Nisson, Whitney S James, Michael T Lawton, Shaohua Ren, Lu Jia, Honging Ji
OBJECTIVE: This study aims to establish a new classification system for proximal anterior cerebral artery (A1) aneurysms and to offer treatment strategies, based on the lessons learned by studying the case reports of 41 patients with A1 aneurysms. METHODS: 2,332 consecutive patients with intracranial aneurysms were treated at a single medical center between June 2005 and May 2015. Forty-one patients with 42 A1 aneurysms were treated by surgical clipping or endovascular coiling...
April 26, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28451763/evaluating-the-performance-of-pi-rads-v2-in-the-non-academic-setting
#17
Eric J Jordan, Charles Fiske, Ronald J Zagoria, Antonio C Westphalen
PURPOSE: To evaluate the utility of PI-RADS v2 to diagnose clinically significant prostate cancer (CS-PCa) with magnetic resonance ultrasound (MR/US) fusion-guided prostate biopsies in the non-academic setting. MATERIALS/METHODS: Retrospective analysis of men whom underwent prostate multiparametric MRI and subsequent MR/US fusion biopsies at a single non-academic center from 11/2014 to 3/2016. Prostate MRIs were performed on a 3-Tesla scanner with a surface body coil...
April 27, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28450231/bow-hunter-s-syndrome-surgical-management-video-and-review-of-the-literature
#18
Ben A Strickland, Martin H Pham, Joshua Bakhsheshian, Jonathan J Russin, William J Mack, Frank L Acosta
BACKGROUND: Bow Hunter's Syndrome (BHS) is a rare condition characterized by vertebrobasilar insufficiency associated with rotational vertebral artery occlusion during head movement. Many existing reports describe surgical management, though no single technique has proven superior. OBJECTIVE: To review all reported cases of BHS with focus on outcomes of individual techniques as well as present a video report of a posterior decompression without fusion performed at the authors' institution...
April 24, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28448445/horizontal-directional-drilling-length-detection-technology-while-drilling-based-on-bi-electro-magnetic-sensing
#19
Yudan Wang, Guojun Wen, Han Chen
The drilling length is an important parameter in the process of horizontal directional drilling (HDD) exploration and recovery, but there has been a lack of accurate, automatically obtained statistics regarding this parameter. Herein, a technique for real-time HDD length detection and a management system based on the electromagnetic detection method with a microprocessor and two magnetoresistive sensors employing the software LabVIEW are proposed. The basic principle is to detect the change in the magnetic-field strength near a current coil while the drill stem and drill-stem joint successively pass through the current coil forward or backward...
April 27, 2017: Sensors
https://www.readbyqxmd.com/read/28447044/molecular-and-phylogenetic-characterization-of-thelohanellus-boggoti-qadri-1962-cnidaria-myxosporea-bivalvulida-infecting-the-fin-of-indian-minor-carp-labeo-dero-hamilton-1822
#20
Harpreet Kaur, Aditya Gupta
A myxozoan parasite belonging to the genus Thelohanellus Kudo, 1933 (Cnidaria, Myxosporea, Bivalvulida) was isolated from the fins of Labeo dero inhabiting Ranjit Sagar Wetland, Punjab, India. The plasmodium was 0.5-0.7 mm in diameter each containing 80- 100 number of myxospores. Myxospores were egg shaped to ovoidal in valvular view having bluntly pointed anterior and broad rounded posterior end measuring 8.36x 4.77 µm. Polar capsule was single, broadly pyriform in shape, measuring 4.77x3.98 µm in size containing a polar filament coiled perpendicular to the longitudinal axis of myxospore body making 7-9 turns...
March 2017: Molecular Biology Research Communications
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