keyword
MENU ▼
Read by QxMD icon Read
search

S cone

keyword
https://www.readbyqxmd.com/read/28940528/assessment-of-a-photon-counting-detector-for-a-dual-energy-c-arm-angiographic-system
#1
Moiz Ahmad, Rebecca Fahrig, Leland Pung, Martin Spahn, Niko S Köster, Silke Reitz, Teri Moore, Jang-Hwan Choi, Waldo Hinshaw, Yan Xia, Kerstin Müller
PURPOSE: This article presents the implementation and assessment of photon-counting dual-energy x-ray detector technology for angiographic C-arm systems in interventional radiology. METHODS: A photon-counting detector was successfully integrated into a clinical C-arm CT system. Detector performance was assessed using image uniformity metrics in both 2D projections and 3D cone-beam computed tomography (CBCT) images. Uniform exposure fields were acquired to analyze projection images and scans of a homogeneous cylinder phantom were taken to analyze 3D reconstructions...
September 22, 2017: Medical Physics
https://www.readbyqxmd.com/read/28934883/contrast-enhanced-computed-tomography-enables-quantitative-evaluation-of-tissue-properties-at-intrajoint-regions-in-cadaveric-knee-cartilage
#2
Rachel C Stewart, Juuso T J Honkanen, Harri T Kokkonen, Virpi Tiitu, Simo Saarakkala, Antti Joukainen, Brian D Snyder, Jukka S Jurvelin, Mark W Grinstaff, Juha Töyräs
Objective The aim of this study was to investigate whether the concentration of the anionic contrast agent ioxaglate, as quantitated by contrast-enhanced computed tomography (CECT) using a clinical cone-beam CT (CBCT) instrument, reflects biochemical, histological, and biomechanical characteristics of articular cartilage imaged in an ex vivo, intact human knee joint. Design An osteoarthritic human cadaveric knee joint (91 years old) was injected with ioxaglate (36 mg I/mL) and imaged using CBCT over 61 hours of ioxaglate diffusion into cartilage...
October 2017: Cartilage
https://www.readbyqxmd.com/read/28929832/cngb3-mutations-cause-severe-rod-dysfunction
#3
J Maguire, M McKibbin, K Khan, S Kohl, M Ali, D McKeefry
PURPOSE: Congenital achromatopsia or rod monochromatism is a rare autosomal recessive condition defined by a severe loss of cone photoreceptor function in which rods purportedly retain normal or near-to-normal function. This report describes the results of electroretinography in two siblings with CNGB3-associated achromatopsia. METHODS: Full field light- and dark-adapted electroretinograms (ERGs) were recorded using standard protocols detailed by the International Society for Clinical Electrophysiology of Vision (ISCEV)...
September 20, 2017: Ophthalmic Genetics
https://www.readbyqxmd.com/read/28900001/samd7-is-a-cell-type-specific-prc1-component-essential-for-establishing-retinal-rod-photoreceptor-identity
#4
Yoshihiro Omori, Shun Kubo, Tetsuo Kon, Mayu Furuhashi, Hirotaka Narita, Taro Kominami, Akiko Ueno, Ryotaro Tsutsumi, Taro Chaya, Haruka Yamamoto, Isao Suetake, Shinji Ueno, Haruhiko Koseki, Atsushi Nakagawa, Takahisa Furukawa
Precise transcriptional regulation controlled by a transcription factor network is known to be crucial for establishing correct neuronal cell identities and functions in the CNS. In the retina, the expression of various cone and rod photoreceptor cell genes is regulated by multiple transcription factors; however, the role of epigenetic regulation in photoreceptor cell gene expression has been poorly understood. Here, we found that Samd7, a rod-enriched sterile alpha domain (SAM) domain protein, is essential for silencing nonrod gene expression through H3K27me3 regulation in rod photoreceptor cells...
September 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28890627/role-of-cone-beam-computed-tomography-in-evaluation-of-radicular-cyst-mimicking-dentigerous-cyst-in-a-7-year-old-child-a-case-report-and-literature-review
#5
B S Mahesh, Shilpa P Shastry, Padmashree S Murthy, T R Jyotsna
AIM: To report a rare case of large radicular cyst-associated deciduous tooth and to discuss the importance of cone beam computed tomography (CBCT) in diagnosing the condition. BACKGROUND: Radicular cyst is the most common cyst affecting the permanent teeth, but its occurrence in deciduous teeth is rare. Most of the radicular cysts are asymptomatic and are discovered accidentally when radiographs are taken. Conventional radiographs show two-dimensional images of three-dimensional objects...
April 2017: International Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28889993/a-subpopulation-of-activated-retinal-macrophages-selectively-migrated-to-regions-of-cone-photoreceptor-stress-but-had-limited-protective-effect-on-cone-death-in-a-mouse-model-for-type-2-leber-congenital-amaurosis
#6
Peter H Tang, Mark J Pierson, Neal D Heuss, Dale S Gregerson
BACKGROUND: Studies of antigen presentation in retina using mice that expressed green fluorescent protein (GFP) from a transgenic CD11c promoter found that retinal GFP(hi) cells possessed antigen presentation function. Subsequent studies found that these high GFP(hi) cells preferentially localized to sites of retinal injury, consistent with their APC function. Interest in the roles of macrophages in degenerative CNS diseases led us to study the GFP(hi) cells in a retinal model of neurodegeneration...
September 7, 2017: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/28889084/a-menu-of-electron-probes-for-optimising-information-from-scanning-transmission-electron-microscopy
#7
D T Nguyen, S D Findlay, J Etheridge
We assess a selection of electron probes in terms of the spatial resolution with which information can be derived about the structure of a specimen, as opposed to the nominal image resolution. Using Ge [001] as a study case, we investigate the scattering dynamics of these probes and determine their relative merits in terms of two qualitative criteria: interaction volume and interpretability. This analysis provides a 'menu of probes' from which an optimum probe for tackling a given materials science question can be selected...
September 7, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28886626/observation-of-the-de-vries-behavior-in-sma-phase-of-a-liquid-crystal-using-polarised-raman-scattering-and-infrared-spectroscopy
#8
A Kocot, J K Vij, T S Perova, K Merkel, V Swaminathan, S P Sreenilayam, N Yadav, V P Panov, P J Stevenson, A Panov, D Rodriguez-Lojo
Two approaches exist in the literature for describing the orientational distribution function (ODF) of the molecular directors in SmA* phase of liquid crystals, though several models are recently proposed in the literature for explaining the de Vries behaviour. These ODFs correspond to either the conventional unimodal arrangements of molecular directors arising from the mean field theory that leads to the broad or sugar-loaf like distribution or to the "diffuse-cone-shaped" type distribution proposed by de Vries...
September 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28885317/ridge-preservation-after-maxillary-third-molar-extraction-using-30-porosity-plga-ha-%C3%AE-tcp-scaffolds-with-and-without-simvastatin-a-pilot-randomized-controlled-clinical-trial
#9
Miguel Noronha Oliveira, Levy Hermes Rau, Aline Marodin, Márcio Corrêa, Letícia Ruhland Corrêa, Aguedo Aragones, Ricardo de Souza Magini
OBJECTIVE: To evaluate clinically and radiographically, in humans, the healing of maxillary third molars postextraction sockets after application of different ridge preservation techniques 3 months after tooth extraction. MATERIALS AND METHODS: Twenty-six sockets (13 patients) were randomly assigned to 4 treatment modalities: deproteinized bovine bone mineral with 10% collagen (DBBM-C), poly(D,L-lactide-co-glycolide) with hydroxyapatite/β-TCP scaffold (PLGA/HA), PLGA/HA/β-TCP with 2...
September 6, 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28877320/the-properties-of-outer-retinal-band-three-investigated-with-adaptive-optics-optical-coherence-tomography
#10
Ravi S Jonnal, Iwona Gorczynska, Justin V Migacz, Mehdi Azimipour, Robert J Zawadzki, John S Werner
Purpose: Optical coherence tomography's (OCT) third outer retinal band has been attributed to the zone of interdigitation between RPE cells and cone outer segments. The purpose of this paper is to investigate the structure of this band with adaptive optics (AO)-OCT. Methods: Using AO-OCT, images were obtained from two subjects. Axial structure was characterized by measuring band 3 thickness and separation between bands 2 and 3 in segmented cones. Lateral structure was characterized by correlation of band 3 with band 2 and comparison of their power spectra...
September 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28872643/tropism-of-engineered-and-evolved-recombinant-aav-serotypes-in-the-rd1-mouse-and-ex-vivo-primate-retina
#11
D G Hickey, T L Edwards, A R Barnard, M S Singh, S R de Silva, M E McClements, J G Flannery, M W Hankins, R E MacLaren
There is much debate on the adeno-associated virus (AAV) serotype that best targets specific retinal cell types and the route of surgical delivery-intravitreal or subretinal. This study compared three of the most efficacious AAV vectors known to date in a mouse model of retinal degeneration (rd1 mouse) and macaque and human retinal explants. GFP driven by a ubiquitous promoter was packaged into three AAV capsids: AAV2/8(Y733F), AAV2/2(quad Y-F) and AAV2/2(7m8). Overall AAV2/2(7m8) transduced the largest area of retina and resulted in the highest level of GFP expression, followed by AAV2/2(quad Y-F) and AAV2/8(Y733F)...
September 5, 2017: Gene Therapy
https://www.readbyqxmd.com/read/28871030/spatiochromatic-interactions-between-individual-cone-photoreceptors-in-the-human-retina
#12
William S Tuten, Wolf M Harmening, Ramkumar Sabesan, Austin Roorda, Lawrence C Sincich
A remarkable feature of human vision is that the retina and brain have evolved circuitry to extract useful spatial and spectral information from signals originating in a photoreceptor mosaic whose trichromatic constituents vary widely in their relative numbers and local spatial configurations. A critical early transformation applied to cone signals is horizontal-cell-mediated lateral inhibition, which imparts a spatially-antagonistic surround to individual cone receptive fields, a signature inherited by downstream neurons and implicated in color signaling...
September 4, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28870227/cone-beam-ct-reconstruction-for-non-periodic-organ-motion-using-time-ordered-chain-graph-model
#13
Masahiro Nakano, Akihiro Haga, Jun'ichi Kotoku, Taiki Magome, Yoshitaka Masutani, Shouhei Hanaoka, Satoshi Kida, Keiichi Nakagawa
PURPOSE: The purpose of this study is to introduce the new concept of a four-dimensional (4D) cone-beam computed tomography (CBCT) reconstruction approach for non-periodic organ motion in cooperation with the time-ordered chain graph model (TCGM) and to compare it with previously developed methods such as total variation-based compressed sensing (TVCS) and prior-image constrained compressed sensing (PICCS). MATERIALS AND METHODS: Our proposed reconstruction is based on a model including the constraint originating from the images of neighboring time phases...
September 4, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28863214/regulation-of-noncoding-transcriptome-in-developing-photoreceptors-by-rod-differentiation-factor-nrl
#14
Lina Zelinger, Gökhan Karakülah, Vijender Chaitankar, Jung-Woong Kim, Hyun-Jin Yang, Matthew J Brooks, Anand Swaroop
Purpose: Transcriptome analysis by next generation sequencing allows qualitative and quantitative profiling of expression patterns associated with development and disease. However, most transcribed sequences do not encode proteins, and little is known about the functional relevance of noncoding (nc) transcriptome in neuronal subtypes. The goal of this study was to perform a comprehensive analysis of long noncoding (lncRNAs) and antisense (asRNAs) RNAs expressed in mouse retinal photoreceptors...
September 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28857415/morphometric-analysis-of-the-maxillary-root-apex-positions-according-to-crowding-severity
#15
S H Kim, S M Shin, Y S Choi, C C Ko, S S Kim, S B Park, W S Son, Y-I Kim
OBJECTIVES: To determine differences in arch forms derived from the root apices locations between individuals with <2 mm maxillary crowding and controls. SETTING AND SAMPLE POPULATION: The Department of Orthodontics, Pusan National University. Cone-beam computed tomography (CBCT) images of 102 patients in the control group and 95 patients in the crowding group. MATERIALS AND METHODS: X, Y and Z coordinates of the tip of the crowns and the apex of the root of the maxillary teeth (except second molars) were determined on the CBCT images...
August 30, 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28856689/real-time-large-scale-in-vivo-observations-reveal-intrinsic-synchrony-plasticity-and-growth-cone-dynamics-of-midline-crossing-axons-during-neuronal-wiring-of-the-zebrafish-spinal-cord
#16
Søren S L Andersen
How axons are wired in the vertebrate spinal cord has been studied mostly using fixed samples or looking at individually growing axons. Using light-sheet microscopy, early neural development is here followed in vivo in real time at high resolution along several hundred micrometers of the zebrafish spinal cord. The dynamics and time course of cellular development and axonal wiring of interneurons expressing GFP under control of the dmrt3 promotor are analyzed. Following neurulation, commissural axons are observed crossing the ventral floor plate midline perpendicularly at about 20 microns/h and in a manner dependent on the Robo3 but not the EphA4 receptors...
August 30, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28856459/the-criteria-of-thickened-liquid-for-dysphagia-management-in-japan
#17
Emi Watanabe, Yoshie Yamagata, Junko Fujitani, Ichiro Fujishima, Koji Takahashi, Risa Uyama, Hiro Ogoshi, Akiko Kojo, Hiroshi Maeda, Koichiro Ueda, Jun Kayashita
In Japan, the viscosity of thickened liquids is different among hospitals and nursing homes. In order to standardize viscosity of thickened liquids, the dysphagia diet committee of the Japanese Society of Dysphagia Rehabilitation developed the Japanese Dysphagia Diet 2013 (JDD2013). To decide on a definition of thickened liquids, the committee reviewed categories from other countries. Especially, the criteria of the USA and Australia were used as references. The definition had three levels: mildly thick, moderately thick, and extremely thick...
August 30, 2017: Dysphagia
https://www.readbyqxmd.com/read/28846139/pooled-analysis-of-1-year-recall-data-from-three-root-canal-treatment-outcome-studies-undertaken-using-cone-beam-computed-tomography
#18
N Al-Nuaimi, S Patel, A Davies, A Bakhsh, F Foschi, F Mannocci
AIM: To provide an estimate of the proportion of successful outcomes of primary and secondary root canal treatments (retreatments) determined by periapical radiographs and cone beam computed tomography (CBCT), a pooled analysis of the data collected from three previous prospective clinical outcome studies was undertaken. METHODOLOGY: The analysis pooled the 1-year results for 354 teeth, including 123 primary treatments and 231 retreatments. All root canals were instrumented with ProTaper Universal and filled using a warm vertical condensation technique...
August 28, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28835808/build-your-own-equiluminance-helmet
#19
Salammbo Connolly, Denis Connolly, Anne Cleary, Laura Herman, Patrick Cavanagh
A wearable 'helmet' version of the S cone isolating technique was constructed to explore vision at equiluminance. For my high school summer science project, I visited parks and streets while wearing the helmet and report that the helmet appears to have captured the main properties described for the large-scale, more cumbersome stage version.
July 2017: I-Perception
https://www.readbyqxmd.com/read/28833277/axial-or-helical-considerations-for-wide-collimation-ct-scanners-capable-of-volumetric-imaging-in-both-modes
#20
Jack W Lambert, Elizabeth D Phillips, Javier E Villanueva-Meyer, Lorenzo Nardo, Luca Facchetti, Robert G Gould
PURPOSE: To determine whether axial or helical mode is more appropriate for a 16 cm collimation CT scanner capable of step-and-shoot volumetric axial coverage, in terms of radiation dose, image quality and scan duration. METHODS: All scans were performed with a Revolution CT (GE Healthcare) operating at 120 kV and 100 mAs. Using calibrated optically stimulated luminescence detectors, radiation dose along the axial scan profile was evaluated at the isocenter, including the overlap region between two axial sections...
August 20, 2017: Medical Physics
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"