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https://www.readbyqxmd.com/read/28440669/can-multiphase-dynamic-ct-angiography-provide-a-better-assessment-of-aortic-dissection-compared-with-the-standard-triphasic-protocol
#1
Chun-Yan Lu, Yi-Ke Diao, Ying-Qiang Guo, Xiao-Hui Zhang, Hong-Li Bai, Zhen-Lin Li
Background Acute aortic dissection (AD) is a life-threatening medical emergency. It has been debated whether the multiphase dynamic computed tomography angiography (CTA) protocol is superior to the standard triphasic protocol for revealing the characteristics of AD. Purpose To examine two multiphase dynamic protocols, Dynamic four-dimensional (4D) CTA using the shuttle mode and Flash 4D CTA using the high-pitch mode for the assessment of AD and to compare them with the standard triphasic protocol. Material and Methods A total of 54 consecutive patients were randomly and equally assigned to three groups and scanned with a second-generation DSCT scanner...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28439307/fluoroscopic-imaging-overestimates-the-screw-tip-to-subchondral-bone-distance-in-a-cadaveric-model-of-slipped-capital-femoral-epiphysis
#2
M J Heffernan, B Snyder, H Zhou, X Li
PURPOSE: Intra-operative imaging plays a key role in screw placement for slipped capital femoral epiphysis (SCFE). Complications have been associated with inadequate screw position. The purpose of this study was to evaluate computed tomography (CT) (3D fluoroscopy) and standard fluoroscopy (C-arm) images as compared with direct anatomic measurement to determine final screw position in a cadaveric SCFE model. METHODS: Osteotomy with pinning was performed at the physeal scar in ten cadaveric hips...
2017: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/28438195/delivery-of-alcohol-brief-interventions-in-community-based-youth-work-settings-exploring-feasibility-and-acceptability-in-a-qualitative-study
#3
Martine Stead, Tessa Parkes, Avril Nicoll, Sarah Wilson, Cheryl Burgess, Douglas Eadie, Niamh Fitzgerald, Jennifer McKell, Garth Reid, Ruth Jepson, John McAteer, Linda Bauld
BACKGROUND: Alcohol Brief Interventions (ABIs) are increasingly being delivered in community-based youth work settings. However, little attention has been paid to how they are being implemented in such settings, or to their feasibility and acceptability for practitioners or young people. The aim of this qualitative study was to explore the context, feasibility and acceptability of ABI delivery in youth work projects across Scotland. METHODS: Individual, paired and group interviews were conducted with practitioners and young people in nine community projects that were either involved in the delivery of ABIs or were considering doing so in the near future...
April 24, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28437954/microstructured-fbg-hydrogen-sensor-based-on-pt-loaded-wo-sub-3-sub
#4
Xian Zhou, Yutang Dai, Joseph Muna Karanja, Fufei Liu, Minghong Yang
Hydrogen gas sensing properties of Pt-WO<sub>3</sub> films on spiral microstructured fiber Bragg grating (FBG) has been demonstrated. Pt-WO<sub>3</sub> film was prepared by hydrothermal method. The spiral microsturctured FBG was fabricated using femtosecond laser. Spiral microstructure FBG hydrogen sensor can detect hydrogen concentration from 0.02% H<sub>2</sub> to 4% H<sub>2</sub> at room temperature, and the response time is shortened from a few minutes to 10~30 s...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28436856/task-based-modeling-of-an-5k-ultra-high-resolution-medical-imaging-system-for-digital-breast-tomosynthesis
#5
Chumin Zhao, Jerzy Kanicki
High-resolution, low noise x-ray detectors based on CMOS active pixel sensor (APS) technology have demonstrated superior imaging performance for digital breast tomosynthesis (DBT). This paper presents a task-based model for a high resolution medical imaging system to evaluate its ability to detect simulated microcalcifications and masses as lesions for breast cancer. Three-dimensional (3D) cascaded system analysis for a 50 μm pixel pitch CMOS APS x-ray detector was integrated with an object task function, a medical imaging display model, and the human eye contrast sensitivity function to calculate the detectability index and area under the ROC curve (AUC)...
April 19, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28436381/absorption-and-transmission-of-light-in-iii-v-nanowire-arrays-for-tandem-solar-cell-applications
#6
Nicklas Anttu, Vilgailė Dagytė, Xulu Zeng, Gaute Otnes, Magnus Borgström
III-V semiconductor nanowires are a platform for next-generation photovoltaics. An interesting research direction is to embed a nanowire array in a transparent polymer, either to act as a stand-alone flexible solar cell, or to be stacked on top of a conventional Si bottom cell to create a tandem structure. To optimize the tandem cell performance, high energy photons should be absorbed in the nanowires whereas low energy photons should be transmitted to and absorbed in the Si cell. Here, through optical measurements on 1...
April 24, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28434756/evaluation-of-tinnitus-retraining-therapy-for-patients-with-normal-audiograms-versus-patients-with-hearing-loss
#7
Kana Lee, Kunihiko Makino, Kohei Yamahara
OBJECTIVE: A few chronic tinnitus patients show normal hearing thresholds in the pure tone audiometry from 125Hz to 8000Hz (≤20dB). We report the characteristics of the course of those patients underwent tinnitus retraining therapy (TRT) compared with other patients suffering from chronic and severe tinnitus. METHODS: We identified 13 patients with normal hearing thresholds among 242 patients suffering over 3 months, Tinnitus Handicap Inventory (THI) ≥16/100, and follow up period is over 6 months...
April 20, 2017: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/28434284/injection-of-basic-fibroblast-growth-factor-for-unilateral-vocal-cord-paralysis
#8
Takeharu Kanazawa, Kazuya Kurakami, Kazutaka Kashima, Ujimoto Konomi, Daigo Komazawa, Kazuhiro Nakamura, Koji Matsushima, Yusuke Akagi, Kiyoshi Misawa, Hiroshi Nishino, Yusuke Watanabe
OBJECTIVE: Unilateral vocal cord paralysis (UVCP) not only induces severe dysphonia, but aspiration as well. Although laryngeal framework surgery is usually performed to treat this condition, the procedure is not tolerated by some patients. In the previous study, basic fibroblast growth factor (bFGF) injections for vocal cord scarring and sulcus have been reported to provide favorable outcomes while being minimally invasive. In this study, the authors retrospectively investigated phonological outcomes after bFGF injection in patients with UVCP...
April 22, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28432739/effect-of-a-4-week-elastic-resistance-band-training-regimen-on-back-kinematics-in-horses-trotting-in-hand-and-on-the-lunge
#9
T Pfau, V Simons, N Rombach, N Stubbs, R Weller
REASONS FOR PERFORMING STUDY: Training and rehabilitation techniques aiming at improving core muscle strength may result in increased dynamic stability of the equine vertebral column. A system of elastic resistance bands is suggested to provide proprioceptive feedback during motion to encourage recruitment of core abdominal and hindquarter musculature for improved dynamic stability. OBJECTIVES: To quantify the effects of a specific resistance band system on back kinematics during trot in-hand and during lungeing at beginning and end of a 4-week exercise programme...
April 22, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/28430216/ultrahigh-birefringence-ultralow-material-loss-porous-core-single-mode-fiber-for-terahertz-wave-guidance
#10
Kawsar Ahmed, Sawrab Chowdhury, Bikash Kumar Paul, Md Shadidul Islam, Shuvo Sen, Md Ibadul Islam, Sayed Asaduzzaman
In this paper, a novel polarization-maintaining single-mode photonic crystal fiber (PCF) has been suggested for terahertz (THz) transmission applications. The reported PCF has five layers of hexagonal cladding with two layers of porous core. The cladding and core territory of the PCF are constituted by circular and elliptical air cavities, accordingly acting as a dielectric medium. Different geometrical parameters of the proposed PCF including pitches and diameters of circular air holes with the major and minor axes of elliptical air cavities being varied with the optimized structure...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429181/hydrodynamic-instabilities-in-active-cholesteric-liquid-crystals
#11
Carl A Whitfield, Tapan Chandra Adhyapak, Adriano Tiribocchi, Gareth P Alexander, Davide Marenduzzo, Sriram Ramaswamy
We describe the basic properties and consequences of introducing active stresses, with principal direction along the local director, in cholesteric liquid crystals. The helical ground state is found to be linearly unstable to extensile stresses, without threshold in the limit of infinite system size, whereas contractile stresses are hydrodynamically screened by the cholesteric elasticity to give a finite threshold. This is confirmed numerically and the non-linear consequences of instability, in both extensile and contractile cases, are studied...
April 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28428227/mechanisms-in-endocrinology-the-multiple-facets-of-gh-lessons-from-lifetime-untreated-isolated-gh-deficiency-due-to-ghrh-receptor-mutation
#12
Manuel Aguiar-Oliveira, Anita Ho Souza, Carla R Oliveira, Viviane C Campos, Luiz A Oliveira-Neto, Roberto Salvatori
Twenty years ago, we described a kindred of 105 individuals with isolated GH deficiency (IGHD) in Itabaianinha County, in Brazilian northeast, due to a homozygous mutation in the GH-releasing hormone receptor gene. These subjects exhibit markedly reduced GH responsiveness to stimulatory tests, and anterior pituitary hypoplasia. Serum concentrations of IGF-I, IGF binding protein type 3, and the acid-labile subunit are markedly reduced, with a lesser reduction of IGF-II. The most striking physical findings of these IGHD individuals are the proportionate short stature, doll facies, high-pitched voice, and visceral obesity with reduced fat free mass...
April 20, 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/28425433/prior-context-in-audition-informs-binding-and-shapes-simple-features
#13
Claire Chambers, Sahar Akram, Vincent Adam, Claire Pelofi, Maneesh Sahani, Shihab Shamma, Daniel Pressnitzer
A perceptual phenomenon is reported, whereby prior acoustic context has a large, rapid and long-lasting effect on a basic auditory judgement. Pairs of tones were devised to include ambiguous transitions between frequency components, such that listeners were equally likely to report an upward or downward 'pitch' shift between tones. We show that presenting context tones before the ambiguous pair almost fully determines the perceived direction of shift. The context effect generalizes to a wide range of temporal and spectral scales, encompassing the characteristics of most realistic auditory scenes...
April 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28425220/associations-between-the-transsexual-voice-questionnaire-tvq-mtf-and-self-report-of-voice-femininity-and-acoustic-voice-measures
#14
Georgia Dacakis, Jennifer Oates, Jacinta Douglas
BACKGROUND: The Transsexual Voice Questionnaire (TVQ(MtF) ) was designed to capture the voice-related perceptions of individuals whose gender identity as female is the opposite of their birth-assigned gender (MtF women). Evaluation of the psychometric properties of the TVQ(MtF) is ongoing. AIMS: To investigate associations between TVQ(MtF) scores and (1) self-perceptions of voice femininity and (2) acoustic parameters of voice pitch and voice quality in order to evaluate further the validity of the TVQ(MtF) ...
April 19, 2017: International Journal of Language & Communication Disorders
https://www.readbyqxmd.com/read/28424573/global-sensory-qualities-and-aesthetic-experience-in-music
#15
Pauli Brattico, Elvira Brattico, Peter Vuust
A well-known tradition in the study of visual aesthetics holds that the experience of visual beauty is grounded in global computational or statistical properties of the stimulus, for example, scale-invariant Fourier spectrum or self-similarity. Some approaches rely on neural mechanisms, such as efficient computation, processing fluency, or the responsiveness of the cells in the primary visual cortex. These proposals are united by the fact that the contributing factors are hypothesized to be global (i.e., they concern the percept as a whole), formal or non-conceptual (i...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28423381/self-administered-tinnitus-pitch-matching-versus-a-conventional-audiometric-procedure
#16
Tae Su Kim, Natalia Yakunina, Yoon-Jong Ryu, Ik Joo Chung, Eui-Cheol Nam
OBJECTIVE: Obtaining an accurate tinnitus pitch match is an initial and critical requirement for tinnitus evaluation and treatment, particularly for applying tailor-made notched music training. We investigated whether computer-based self-administered tinnitus pitch matching (CSTPM) is comparable with a conventional audiometric procedure (CAP). METHODS: In total, 82 patients (mean age 45.52 years; 42 females) with tonal tinnitus participated. The CAP was performed by the same audiologist using a 2-alternative forced choice method with a frequency range of 0...
April 20, 2017: Audiology & Neuro-otology
https://www.readbyqxmd.com/read/28419056/response-characteristics-of-the-rat-anterior-cingulate-cortex-to-ultrasonic-communicative-vocalizations
#17
Yumi Saito, Kazuo Okanoya
Emotional communication involves transmitting information on affective states. Rat 50- and 22-kHz ultrasonic vocalizations (USVs) are emotional communication signals that reflect positive or negative states, respectively. In general, emotional communication signals that elicit changes in event-related potentials (ERPs), suggesting a specific mechanism for processing these signals. As this is observed in several communication systems including humans, we hypothesized that rat USVs can also trigger such changes...
April 17, 2017: Neuroreport
https://www.readbyqxmd.com/read/28418673/aberration-corrected-electron-beam-lithography-at-the-one-nanometer-length-scale
#18
Vitor Riseti Manfrinato, Aaron Stein, Lihua Zhang, Chang-Yong Nam, Kevin G Yager, Eric A Stach, Charles T Black
Patterning materials efficiently at the smallest length scales is a longstanding challenge in nanotechnology. Electron-beam lithography (EBL) is the primary method for patterning arbitrary features, but EBL has not reliably provided sub-4 nanometer patterns. The few competing techniques that have achieved this resolution are orders of magnitude slower than EBL. In this work, we employed an aberration-corrected scanning transmission electron microscope for lithography to achieve unprecedented resolution. Here we show aberration-corrected EBL at the one nanometer length scale using poly(methyl methacrylate) (PMMA), and have produced both the smallest isolated feature in any conventional resist (1...
April 18, 2017: Nano Letters
https://www.readbyqxmd.com/read/28418324/prosody-perception-and-production-in-children-with-hearing-loss-and-age-and-gender-matched-controls
#19
Rose Thomas Kalathottukaren, Suzanne C Purdy, Elaine Ballard
BACKGROUND: Auditory development in children with hearing loss, including the perception of prosody, depends on having adequate input from cochlear implants and/or hearing aids. Lack of adequate auditory stimulation can lead to delayed speech and language development. Nevertheless, prosody perception and production in people with hearing loss have received less attention than other aspects of language. The perception of auditory information conveyed through prosody using variations in the pitch, amplitude, and duration of speech is not usually evaluated clinically...
April 2017: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/28418323/the-personality-profile-of-tinnitus-sufferers-and-a-nontinnitus-control-group
#20
Mithila Durai, Mary G O'Keeffe, Grant D Searchfield
BACKGROUND: Chronic tinnitus (phantom perception of sound) significantly disrupts quality of life in 15-20% of those who experience it. Understanding how certain personality traits impact tinnitus perception and distress can be beneficial for the development of interventions to improve the lives of tinnitus sufferers. PURPOSE: Four key self-reported personality traits (social closeness, stress reaction, alienation, and self-control) were identified from previous research as being associated with tinnitus...
April 2017: Journal of the American Academy of Audiology
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