keyword
MENU ▼
Read by QxMD icon Read
search

S cone

keyword
https://www.readbyqxmd.com/read/29350579/evaluation-of-respiratory-motion-corrected-cone-beam-ct-at-end-expiration-in-abdominal-radiotherapy-sites-a-prospective-study
#1
Russell E Kincaid, Agung E Hertanto, Yu-Chi Hu, Abraham J Wu, Karyn A Goodman, Hai D Pham, Ellen D Yorke, Qinghui Zhang, Qing Chen, Gig S Mageras
BACKGROUND: Cone beam computed tomography (CBCT) for radiotherapy image guidance suffers from respiratory motion artifacts. This limits soft tissue visualization and localization accuracy, particularly in abdominal sites. We report on a prospective study of respiratory motion-corrected (RMC)-CBCT to evaluate its efficacy in localizing abdominal organs and improving soft tissue visibility at end expiration. MATERIAL AND METHODS: In an IRB approved study, 11 patients with gastroesophageal junction (GEJ) cancer and five with pancreatic cancer underwent a respiration-correlated CT (4DCT), a respiration-gated CBCT (G-CBCT) near end expiration and a one-minute free-breathing CBCT scan on a single treatment day...
January 19, 2018: Acta Oncologica
https://www.readbyqxmd.com/read/29349376/directional-tip-control-technique-for-optimal-stent-graft-alignment-in-angulated-proximal-aortic-landing-zones
#2
Toshio Takayama, Patrick J Phelan, Jon S Matsumura
Angulated anatomy in the aorta, such as tortuous infrarenal aortic necks or steep aortic arches, is a significant challenge for endovascular aortic repair because it often causes inadequate sealing and fixation, which may lead to treatment failure. We have developed a technique using off-the-shelf equipment to precisely control the deployment of stent grafts in challenging landing zones. The key of this technique is to create a through-and-through wire between two access sites and to use a guiding device over the wire...
June 2017: Journal of Vascular Surgery Cases and Innovative Techniques
https://www.readbyqxmd.com/read/29348700/open-air-sprays-for-capturing-and-controlling-airborne-float-coal-dust-on-longwall-faces
#3
T W Beck, C E Seaman, M R Shahan, S E Mischler
Float dust deposits in coal mine return airways pose a risk in the event of a methane ignition. Controlling airborne dust prior to deposition in the return would make current rock dusting practices more effective and reduce the risk of coal-dust-fueled explosions. The goal of this U.S. National Institute for Occupational Safety and Health study is to determine the potential of open-air water sprays to reduce concentrations of airborne float coal dust, smaller than 75 µm in diameter, in longwall face airstreams...
January 2018: Mining Engineering
https://www.readbyqxmd.com/read/29347979/altered-environmental-light-drives-retinal-change-in-the-atlantic-tarpon-megalops-atlanticus-over-timescales-relevant-to-marine-environmental-disturbance
#4
Lorian E Schweikert, Michael S Grace
BACKGROUND: For many fish species, retinal function changes between life history stages as part of an encoded developmental program. Retinal change is also known to exhibit plasticity because retinal form and function can be influenced by light exposure over the course of development. Aside from studies of gene expression, it remains largely unknown whether retinal plasticity can provide functional responses to short-term changes in environmental light quality. The aim of this study was to determine whether the structure and function of the fish retina can change in response to altered light intensity and spectrum-not over the course of a developmental regime, but over shorter time periods relevant to marine habitat disturbance...
January 18, 2018: BMC Ecology
https://www.readbyqxmd.com/read/29347616/design-and-investigation-of-de-vries-liquid-crystals-based-on-5-phenyl-pyrimidine-and-r-r-2-3-epoxyhexoxy-backbone
#5
S P Sreenilayam, D Rodriguez-Lojo, V P Panov, V Swaminathan, J K Vij, Yu P Panarin, E Gorecka, A Panov, P J Stevenson
Calamitic liquid crystals based on 5-phenyl-pyrimidine derivatives have been designed, synthesized, and characterized. The 5-phenyl pyrimidine core was functionalized with a chiral (R,R)-2,3-epoxyhexoxy chain on one side and either siloxane or perfluoro terminated chains on the opposite side. The one involving a perfluorinated chain shows SmA^{*} phase over a wide temperature range of 82 °C, whereas the siloxane analog exhibits both SmA^{*} and SmC^{*} phases over a broad range of temperatures, and a weak first-order SmA^{*}-SmC^{*} transition is observed...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29345557/co-registration-of-cone-beam-ct-and-preoperative-mri-for-improved-accuracy-of-electrode-localization-following-cochlear-implantation
#6
A S Dragovic, A K Stringer, L Campbell, C Shaul, S J O'Leary, R J Briggs
OBJECTIVES: To investigate the clinical usefulness and practicality of co-registration of Cone Beam CT (CBCT) with preoperative Magnetic Resonance Imaging (MRI) for intracochlear localization of electrodes after cochlear implantation. METHODS: Images of 20 adult patients who underwent CBCT after implantation were co-registered with preoperative MRI scans. Time taken for co-registration was recorded. The images were analysed by clinicians of varying levels of expertise to determine electrode position and ease of interpretation...
January 18, 2018: Cochlear Implants International
https://www.readbyqxmd.com/read/29340643/association-of-low-luminance-questionnaire-with-objective-functional-measures-in-early-and-intermediate-age-related-macular-degeneration
#7
Atalie C Thompson, Ulrich F O Luhmann, Sandra S Stinnett, Lejla Vajzovic, Anupama Horne, Cynthia A Toth, Scott W Cousins, Eleonora M Lad
Purpose: To determine whether Low Luminance Questionnaire (LLQ) scores are associated with objective measures of visual function in early and intermediate age-related macular degeneration (AMD). Methods: Cross-sectional study of subjects with early AMD Age-Related Eye Disease Study (AREDS) stage 2, N = 33), intermediate AMD (AREDS stage 3, N = 47), and age-matched healthy controls (N = 21). Subjects were interviewed with the LLQ. Psychophysical tests performed included best-corrected visual acuity (BCVA), mesopic microperimetry, dark adaptometry (DA), low luminance visual acuity (LLVA), and cone contrast test (CCT)...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29336453/semimetallic-carbon-honeycombs-new-three-dimensional-graphene-allotropes-with-dirac-cones
#8
Shuaiwei Wang, Donghai Wu, Baocheng Yang, Eli Ruckenstein, Houyang Chen
Classic two-dimensional (2D) graphene possesses outstanding properties due to Dirac cone structures. When scaling up to three-dimensional (3D) structures, their high porosity and large surface-area-to-volume ratio made them have more promising engineering perspectives. However, the currently synthesized and density-functional-theory-predicted 3D graphene structures, termed as carbon honeycombs (CHCs), are metallic. Herein, we propose new families of stable semimetallic CHC structures, which have lower energies than the previous experimentally reported structure and they would be realized experimentally...
January 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29333774/-a-cone-beam-computed-tomography-study-on-the-anatomical-position-of-accessory-mandibular-foramina-in-jiangxi-adults
#9
Ke Xing, Li Bohan, Chen Linlin, Jiang Xindi
OBJECTIVE: This study used cone beam computed tomography (CBCT) to access the distribution and position of accessory mandibular foramina in the mandibular body of Jiangxi adults, and some safety rules of operation for clinics were provided. METHODS: Two hundred CBCT image subjects of Jiangxi adults were selected, which were divided into 4 groups by age with the same sex ratio. The number and position of accessory mandibular foramina in mandibular anterior teeth, premolars and molars region were described and the relationship between accessory mandibular foramina incidence and factors of age, gender and lateral were analyzed...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29332120/severe-loss-of-tritan-color-discrimination-in-rpe65-associated-leber-congenital-amaurosis
#10
Neruban Kumaran, Caterina Ripamonti, Angelos Kalitzeos, Gary S Rubin, James W B Bainbridge, Michel Michaelides
Purpose: RPE65-associated Leber congenital amaurosis (RPE65-LCA) is a progressive severe retinal dystrophy with early profound dysfunction of rod photoreceptors followed by progressive cone photoreceptor degeneration. We aim to provide detailed information about how cone dysfunction affects color discrimination. Methods: Seven adults (aged 16-21) with RPE65-LCA underwent monocular color discrimination assessment using the Trivector and Ellipse versions of three computerized tests: Cambridge Colour Test (CCT), low vision version of the Cambridge Colour Test (lvvCCT), and the Universal Colour Discrimination Test (UCDT)...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29327076/arms-down-cone-beam-ct-hepatic-angiography-performance-assessment-vascular-imaging-quality-and-imaging-artifacts
#11
Adrian J Gonzalez-Aguirre, Elena N Petre, Meier Hsu, Chaya S Moskowitz, Stephen B Solomon, Jeremy C Durack
INTRODUCTION: The practice of positioning patients' arms above the head during catheter-injected hepatic arterial phase cone beam CT (A-CBCT) imaging has been inherited from standard CT imaging due to image quality concerns, but interrupts workflow and extends procedure time. We sought to assess A-CBCT image quality and artifacts with arms extended above the head versus down by the side. METHODS: We performed an IRB approved retrospective evaluation of reformatted and 3D-volume rendered images from 91 consecutive A-CBCTs (43 arms up, 48 arms down) acquired during hepatic tumor arterial embolization procedures...
January 11, 2018: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/29325457/synthetic-adeno-associated-viral-vector-efficiently-targets-mouse-and-non-human-primate-retina-in-vivo
#12
Livia S Carvalho, Ru Xiao, Sarah Wassmer, Aliete Langsdorf, Eric Zinn, Simon Pacouret, Samiksha Shah, Jason I Comander, Leo Kim, Laurence Lim, Luk H Vandenberghe
Gene therapy is a promising approach in the treatment of inherited and common complex disorders of the retina. Preclinical and clinical studies have validated the use of adeno-associated viral vectors (AAV) as a safe and efficient delivery vehicle for gene transfer. RPE and rods, and to a lesser extent, cone photoreceptors can be efficiently targeted with AAV. Other retinal cell types however are more challenging targets. The aim of this study was to characterize the transduction profile and efficiency of in silico designed, synthetic Anc80 AAVs for retinal gene transfer...
January 12, 2018: Human Gene Therapy
https://www.readbyqxmd.com/read/29321522/accelerated-proteomic-visualization-of-individual-predatory-venoms-of-conus-purpurascens-reveals-separately-evolved-predation-evoked-venom-cabals
#13
S W A Himaya, Frank Marí, Richard J Lewis
Cone snail venoms have separately evolved for predation and defense. Despite remarkable inter- and intra-species variability, defined sets of synergistic venom peptides (cabals) are considered essential for prey capture by cone snails. To better understand the role of predatory cabals in cone snails, we used a high-throughput proteomic data mining and visualisation approach. Using this approach, the relationship between the predatory venom peptides from nine C. purpurascens was systematically analysed. Surprisingly, potentially synergistic levels of κ-PVIIA and δ-PVIA were only identified in five of nine specimens...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29320632/increasing-the-stability-of-recombinant-human-green-cone-pigment
#14
Timothy S Owen, David Salom, Wenyu Sun, Krzysztof Palczewski
Three types of cone cells exist in the human retina, each containing a different pigment responsible for the initial step of photo-transduction. These pigments are distinguished by their specific absorbance maxima, 425 nm (blue), 530 nm (green) and 560 nm (red). Each pigment contains a common chromophore, 11-cis-retinal covalently bound to an opsin protein via a Schiff base. The 11-cis-retinal protonated Schiff base has an absorbance maxima at 440 nm in methanol. Unfortunately, the chemistry allowing the same chromophore interacting with different opsin proteins to tune the absorbance of the resulting pigments to distinct λmax values is poorly understood...
January 10, 2018: Biochemistry
https://www.readbyqxmd.com/read/29320573/an-evaluation-of-three-dimensional-photogrammetric-and-morphometric-techniques-for-estimating-volume-and-mass-in-weddell-seals-leptonychotes-weddellii
#15
Roxanne S Beltran, Brandi Ruscher-Hill, Amy L Kirkham, Jennifer M Burns
Body mass dynamics of animals can indicate critical associations between extrinsic factors and population vital rates. Photogrammetry can be used to estimate mass of individuals in species whose life histories make it logistically difficult to obtain direct body mass measurements. Such studies typically use equations to relate volume estimates from photogrammetry to mass; however, most fail to identify the sources of error between the estimated and actual mass. Our objective was to identify the sources of error that prevent photogrammetric mass estimation from directly predicting actual mass, and develop a methodology to correct this issue...
2018: PloS One
https://www.readbyqxmd.com/read/29311335/melanopsin-and-l-cone-induced-pupil-constriction-is-inhibited-by-s-and-m-cones-in-humans
#16
Tom Woelders, Thomas Leenheers, Marijke C M Gordijn, Roelof A Hut, Domien G M Beersma, Emma J Wams
The human retina contains five photoreceptor types: rods; short (S)-, mid (M)-, and long (L)-wavelength-sensitive cones; and melanopsin-expressing ganglion cells. Recently, it has been shown that selective increments in M-cone activation are paradoxically perceived as brightness decrements, as opposed to L-cone increments. Here we show that similar effects are also observed in the pupillary light response, whereby M-cone or S-cone increments lead to pupil dilation whereas L-cone or melanopic illuminance increments resulted in pupil constriction...
January 8, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29305531/nonselective-wiring-accounts-for-red-green-opponency-in-midget-ganglion-cells-of-the-primate-retina
#17
Lauren E Wool, Joanna D Crook, John B Troy, Orin S Packer, Qasim Zaidi, Dennis M Dacey
In primate retina, "red-green" color-coding is initiated when signals originating in long (L) and middle (M) wavelength-sensitive cone photoreceptors interact antagonistically. The center-surround receptive field of "midget" ganglion cells provides the neural substrate for L versus M cone-opponent interaction, but the underlying circuitry remains unsettled, centering around the longstanding question of whether specialized cone wiring is present. To address this question, we measured the strength, sign, and spatial tuning of L and M cone input to midget receptive fields in the peripheral retina of macaque primates of either sex...
January 5, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29300962/pharmacokinetic-characterization-of-11-nor-9-carboxy-%C3%AE-9-tetrahydrocannabinol-in-urine-following-acute-oral-cannabis-ingestion-in-healthy-adults
#18
Nicolas J Schlienz, Edward J Cone, Evan S Herrmann, Natalie A Lembeck, John M Mitchell, George E Bigelow, Ronald Flegel, Charles P LoDico, Eugene D Hayes, Ryan Vandrey
Understanding the urine excretion profile for Δ9-tetrahydrocannabinol (THC) metabolites is important for accurate detection and interpretation of toxicological testing for cannabis use. Prior literature has primarily evaluated the urinary pharmacokinetics of the non-psychoactive THC metabolite 11-nor-9-carboxy-Δ9-tetrahydrocannabinol (THCCOOH) following smoked cannabis administration. The present study examined the urine THCCOOH excretion profile following oral cannabis administration in 18 healthy adults...
December 28, 2017: Journal of Analytical Toxicology
https://www.readbyqxmd.com/read/29298859/fast-acquisition-cone-beam-computed-tomography-initial-experience-with-a-10-s-protocol
#19
Visish M Srinivasan, Gouthami Chintalapani, Kevin Matthew Camstra, Sabih T Effendi, Jacob Cherian, Jeremiah N Johnson, Stephen R Chen, Peter Kan
BACKGROUND: Cone-beam computed tomography (CBCT) facilitates the acquisition of cross-sectional imaging in angiography suites using a rotational C-arm and digital flat panel detectors. The applications are numerous, including evaluation of implanted devices and localization of cerebrovascular lesions. We present and validate the clinical utility of an alternative fast CBCT acquisition protocol in the context of neurovascular device imaging. METHODS: Contrast-enhanced (CE)-CBCT images were acquired using a new 10 s protocol in a phantom head model, swine model, and in patients...
January 3, 2018: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29298697/cone-beam-computed-tomography-for-the-assessment-of-linear-scleroderma-of-the-face
#20
C Di Giovanni, S Puggina, A Meneghel, F Vittadello, G Martini, F Zulian
BACKGROUND: To date, standardized methods for assessing the disease progression of linear scleroderma of the face (LSF) are lacking. OBJECTIVES: We investigated whether Cone Beam Computed Tomography (CBCT) may represent a reliable tool for assessing linear scleroderma of the face (LSF). METHODS: Ten patients with LSF and five age-matched controls underwent CBCT assessment. The transverse sections at three anatomic levels of the maxillofacial bones were analyzed...
January 3, 2018: Pediatric Rheumatology Online Journal
keyword
keyword
29442
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"