keyword
MENU ▼
Read by QxMD icon Read
search

Tilt test

keyword
https://www.readbyqxmd.com/read/28343096/sd-sem-sparse-dense-correspondence-for-3d-reconstruction-of-microscopic-samples
#1
Ahmadreza Baghaie, Ahmad P Tafti, Heather A Owen, Roshan M D'Souza, Zeyun Yu
Scanning electron microscopy (SEM) imaging has been a principal component of many studies in biomedical, mechanical, and materials sciences since its emergence. Despite the high resolution of captured images, they remain two-dimensional (2D). In this work, a novel framework using sparse-dense correspondence is introduced and investigated for 3D reconstruction of stereo SEM images. SEM micrographs from microscopic samples are captured by tilting the specimen stage by a known angle. The pair of SEM micrographs is then rectified using sparse scale invariant feature transform (SIFT) features/descriptors and a contrario RANSAC for matching outlier removal to ensure a gross horizontal displacement between corresponding points...
March 20, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28339587/incisor-inclination-and-perceived-tooth-colour-changes
#2
Philip Ciucchi, Stavros Kiliaridis
Introduction: Social attractiveness is influenced by a variety of different smile-related factors. We evaluated whether the degree of upper central incisor proclination can result in tooth colour change. Methods: Forty young adult subjects (20-25 years) in good health with a complete sound dentition were selected. The subjects were seated in standardized light conditions with an above-directed light source. Their natural head position was stated as 0 degrees. To mimic the range of possible anterior torque movements they were asked to tilt their heads upward +15 degrees (upward tilting) and downward -15 degrees (downward tilting)...
January 25, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28338449/development-of-a-preoperative-predictive-model-for-major-complications-following-adult-spinal-deformity-surgery
#3
Justin K Scheer, Justin S Smith, Frank Schwab, Virginie Lafage, Christopher I Shaffrey, Shay Bess, Alan H Daniels, Robert A Hart, Themistocles S Protopsaltis, Gregory M Mundis, Daniel M Sciubba, Tamir Ailon, Douglas C Burton, Eric Klineberg, Christopher P Ames
OBJECTIVE The operative management of patients with adult spinal deformity (ASD) has a high complication rate and it remains unknown whether baseline patient characteristics and surgical variables can predict early complications (intraoperative and perioperative [within 6 weeks]). The development of an accurate preoperative predictive model can aid in patient counseling, shared decision making, and improved surgical planning. The purpose of this study was to develop a model based on baseline demographic, radiographic, and surgical factors that can predict if patients will sustain an intraoperative or perioperative major complication...
March 24, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28333901/influence-of-the-recurrent-syncope-episodes-on-neurocognitive-functions-in-patients-with-vasovagal-syncope
#4
Joanna Jędrzejczyk-Spaho, Artur Z Pietrucha, Agnieszka Borowiec, Irena Bzukała, Mateusz Wnuk, Ewa Konduracka, Jadwiga Nessler
The aim of study was to evaluate an influence of recurrent syncope episodes on the neurocognitive functions (NCF) in patients with suspected VVS. AIM: The aim of study was to evaluate an influence of recurrent syncope episodes on the neurocognitive functions (NCF) in patients with suspected VVS. MATERIALS AND METHODS: Study population: 24 pts. (16 women) aged 17-70 yrs (mean age 40 years), with suspected VVS, referred to HUTT (head-up tilt test). All pts. underwent initial evaluation regarding to the number and circumstances of the syncopal and/or presyncopal spells...
March 21, 2017: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/28320847/multivoxel-pattern-analysis-reveals-3d-place-information-in-the-human-hippocampus
#5
Misun Kim, Kate J Jeffery, Eleanor A Maguire
The spatial world is three-dimensional (3D), and humans and other animals move both horizontally and vertically within it. Extant neuroscientific studies have typically investigated spatial navigation on a horizontal two-dimensional plane, leaving much unknown about how 3D spatial information is represented in the brain. Specifically, horizontal and vertical information may be encoded in the same or different neural structures with equal or unequal sensitivity. Here, we investigated these possibilities using functional MRI (fMRI) while participants were passively moved within a 3D lattice structure as if riding a rollercoaster...
March 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28306330/effect-of-changing-the-head-position-on-accuracy-of-transverse-measurements-of-the-maxillofacial-region-made-on-cone-beam-computed-tomography-and-conventional-posterior-anterior-cephalograms
#6
Abbas Shokri, Amirfarhang Miresmaeili, Nasrin Farhadian, Sepideh Falah-Kooshki, Payam Amini, Najmeh Mollaie
OBJECTIVES: This study aimed to assess the effect of head position on the accuracy of transverse measurements of the maxillofacial region on cone beam computed tomography (CBCT) and conventional posterior-anterior (PA) cephalograms. The second objective of this study was to find skull positions with the greatest and smallest effect on transverse measurements in the maxillofacial region. METHODS: PA cephalograms and CBCT scans were obtained from 10 dry human skulls in seven positions namely the central position, 10° and 20° rotations, 10° and 20° tilts and 10° and 20° tips...
March 17, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28300371/energy-dependence-and-angular-dependence-of-an-optically-stimulated-luminescence-dosimeter-in-the-mammography-energy-range
#7
Ai Kawaguchi, Yuta Matsunaga, Shoichi Suzuki, Koichi Chida
This study aimed to investigate the energy dependence and the angular dependence of commercially available optically stimulated luminescence (OSL) point dosimeters in the mammography energy range. The energy dependence was evaluated to calculate calibration factors (CFs). The half-value layer range was 0.31-0.60 mmAl (Mo/Mo 22-28 kV, Mo/Rh 28-32 kV, and W/Rh 30-34 kV at 2-kV intervals). Mo/Rh 28 kV was the reference condition. Angular dependence was tested by rotating the X-ray tube from -90° to 90° in 30° increments, and signal counts from angled nanoDots were normalized to the 0° signal counts...
March 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28299441/the-r2r3myb-vvmybpa1-from-grape-reprograms-the-phenylpropanoid-pathway-in-tobacco-flowers
#8
Valentina Passeri, Stefan Martens, Elisabete Carvalho, Chantal Bianchet, Francesco Damiani, Francesco Paolocci
This work shows that, in tobacco, the ectopic expression of VvMYBPA1 , a grape regulator of proanthocyanidin biosynthesis, up- or down-regulates different branches of the phenylproanoid pathway, in a structure-specific fashion. Proanthocyanidins are flavonoids of paramount importance for animal and human diet. Research interest increasingly tilts towards generating crops enriched with these health-promoting compounds. Flavonoids synthesis is regulated by the MBW transcriptional complex, made of R2R3MYB, bHLH and WD40 proteins, with the MYB components liable for channeling the complex towards specific branches of the pathway...
March 15, 2017: Planta
https://www.readbyqxmd.com/read/28294432/should-we-treat-severe-vasovagal-syncope-with-a-pacemaker
#9
REVIEW
R Sutton
Cardiac pacing for vasovagal syncope (VVS) addresses the cardioinhibitory component of the reflex but cannot directly affect vasodepression, which occurs in every reflex even when hidden by dominant cardioinhibition. The randomized controlled trials of pacing in VVS have, after almost 2 decades, determined that a small number of patients can benefit because their vasodepressor component is not severe. Early studies compared pacing with no therapy yielding highly significant benefits. Subsequently, all study patients had implanted devices with half being switched off...
March 14, 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28292884/vascular-conductance-and-muscle-blood-flow-during-exercise-are-altered-by-inspired-oxygen-fraction-and-arterial-perfusion-pressure
#10
Rodrigo Villar, Richard L Hughson
We tested the hypothesis during the combined challenges of altered inspired O2 fraction (FIO2) and posture changes at lower power output regardless of body position that the vascular conductance (VC) recruitment to the exercising muscle would not limit muscle perfusion and estimated O2 delivery (DO2est ). However, in head-down tilt at the higher power output exercise in hypoxia, the recruitment of VC would have a functional limitation which would restrict muscle blood flow (MBF) leading to a limitation in DO2est with consequent increases in metabolic stress...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28288331/within-assessor-reliability-and-minimal-detectable-change-of-gait-kinematics-in-a-young-obese-demographic
#11
Brian Horsak, Barbara Pobatschnig, Arnold Baca, Susanne Greber-Platzer, Alexandra Kreissl, Stefan Nehrer, Barbara Wondrasch, Richard Crevenna, Mohammad Keilani, Andreas Kranzl
INTRODUCTION: Three-dimensional gait analysis (3DGA) in obese populations is a difficult task due to a great amount of subcutaneous fat. This makes it more challenging to identify anatomical landmarks, thus leading to inconsistent marker placement. Therefore, the purpose of this study was to investigate the test-retest reliability for kinematic measurements of obese children and adolescents. METHODS: Nine males and two females with an age-based BMI above the 97th percentile (age: 14...
March 2, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28286774/orthostatic-intolerance-and-postural-orthostatic-tachycardia-syndrome-in-joint-hypermobility-syndrome-ehlers-danlos-syndrome-hypermobility-type-neurovegetative-dysregulation-or-autonomic-failure
#12
Claudia Celletti, Filippo Camerota, Marco Castori, Federica Censi, Laura Gioffrè, Giovanni Calcagnini, Stefano Strano
Background. Joint hypermobility syndrome/Ehlers-Danlos syndrome, hypermobility type (JHS/EDS-HT), is a hereditary connective tissue disorder mainly characterized by generalized joint hypermobility, skin texture abnormalities, and visceral and vascular dysfunctions, also comprising symptoms of autonomic dysfunction. This study aims to further evaluate cardiovascular autonomic involvement in JHS/EDS-HT by a battery of functional tests. Methods. The response to cardiovascular reflex tests comprising deep breathing, Valsalva maneuver, 30/15 ratio, handgrip test, and head-up tilt test was studied in 35 JHS/EDS-HT adults...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28276651/realignment-surgery-for-malunited-ankle-fracture
#13
Chang-Jun Guo, Xing-Cheng Li, Mu Hu, Yang Xu, Xiang-Yang Xu
OBJECTIVE: To investigate the characteristics and the results of realignment surgery for the treatment of malunited ankle fracture. METHODS: Thirty-three patients with malunited fractures of the ankle who underwent reconstructive surgery at our hospital from January 2010 to January 2014 were reviewed. The tibial anterior surface angle (TAS), the tibiotalar tilt angle (TTA), the malleolar angle (MA), and the tibial lateral surface angle (TLS) were measured. Clinical assessment was performed with use of the American Orthopaedic Foot and Ankle Society (AOFAS) scale and visual analogue scale (VAS) scores, and the osteoarthritis stage was determined radiographically with the modified Takakura classification system...
March 9, 2017: Orthopaedic Surgery
https://www.readbyqxmd.com/read/28269522/analysis-of-a-cardiovascular-model-for-the-study-of-the-autonomic-response-of-brugada-syndrome-patients
#14
Mireia Calvo, Virginie Le Rolle, Daniel Romero Perez, Nathalie Behar, Pedro Gomis, Philippe Mabo, Alfredo I Hernandez
This paper describes the integration of mathematical models of the cardiac electrical activity, the cardiovascular system and the baroreceptor reflex control of the autonomic nervous system, with a model representing a head-up tilt test. Sensitivity analyses are performed in order to determine those model parameters producing the greatest significant effects on heart rate and blood pressure. An optimization step is then applied to the most influential parameters in order to find the best model fit to real cardiac data obtained from a patient suffering from Brugada syndrome and a healthy subject, in supine and upright postures during a tilt test...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268475/a-multivariate-time-frequency-approach-for-tracking-qt-variability-changes-unrelated-to-heart-rate-variability
#15
Michele Orini, Peter Taggart, Pier D Lambiase
The beat-to-beat variability of the QT interval (QTV) is a marker of ventricular repolarization (VR) dynamics and it has been suggested as an index of sympathetic ventricular outflow and cardiac instability. However, QTV is also affected by RR (or heart rate) variability (RRV), and QTV due to RRV may reduce QTV specificity as a VR marker. Therefore, it would be desirable to separate QTV due to VR dynamics from QTV due to RRV. To do that, previous work has mainly focused on heart rate corrections or time-invariant autoregressive models...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268420/delta-space-plot-analysis-of-cardiovascular-coupling-in-vasovagal-syncope-during-orthostatic-challenge
#16
S Reulecke, S Charleston-Villalobos, A Voss, R Gonzalez-Camarena, M Gaitan-Gonzalez, J Gonzalez-Hermosillo, G Hernandez-Pacheco, T Aljama-Corrales
In this work, a graphical method to study cardiovascular coupling, called delta space plot analysis (DSPA), was introduced. The graphical representation is susceptible to be parameterized in shape and orientation. The usefulness of this technique was studied on cardiovascular data from patients with vasovagal syncope (VVS) and from controls. The study included 15 female patients diagnosed with VVS and 11 age-matched healthy female subjects. All subjects were enrolled in a head-up tilt (HUT) test, breathing normally, including 5 minutes of supine position (baseline) and 18 minutes of 70° orthostatic phase...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267762/impaired-perception-of-surface-tilt-in-progressive-supranuclear-palsy
#17
Marian L Dale, Fay B Horak, W Geoffrey Wright, Bernadette M Schoneburg, John G Nutt, Martina Mancini
INTRODUCTION: Progressive supranuclear palsy (PSP) is characterized by early postural instability and backward falls. The mechanisms underlying backward postural instability in PSP are not understood. The aim of this study was to test the hypothesis that postural instability in PSP is a result of dysfunction in the perception of postural verticality. METHODS: We gathered posturography data on 12 subjects with PSP to compare with 12 subjects with idiopathic Parkinson's Disease (PD) and 12 healthy subjects...
2017: PloS One
https://www.readbyqxmd.com/read/28264631/effects-of-patellofemoral-taping-on-patellofemoral-joint-alignment-and-contact-area-during-weight-bearing
#18
Kai-Yu Ho, Ryan Epstein, Ron Garcia, Nicole Riley, Szu-Ping Lee
Study Design Controlled laboratory study. Background Although it has been theorized that patellofemoral joint (PFJ) taping can correct patellar malalignment, the effects of PFJ taping techniques on patellar alignment and contact area have not yet been studied during weight bearing. Objective To examine the effects of 2 taping approaches (Kinesio and McConnell) on PFJ alignment and contact area. Methods Fourteen female subjects with patellofemoral pain and PFJ malalignment participated. Each subject underwent a pretaping magnetic resonance imaging (MRI) scan session and 2 MRI scan sessions after the application of the 2 taping techniques, which aimed to correct lateral patellar displacement...
February 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/28263259/head-down-posture-in-glaucoma-suspects-induces-changes-in-iop-systemic-pressure-and-perg-that-predict-future-loss-of-optic-nerve-tissue
#19
Vittorio Porciatti, William J Feuer, Pedro Monsalve, Giacinto Triolo, Luis Vazquez, John McSoley, Lori M Ventura
PURPOSE: To obtain pilot data on posture-induced changes of intraocular pressure (IOP), systemic pressure, and pattern electroretinogram (PERG) predictive of future optic nerve tissue loss glaucoma suspects (GSs). METHODS: Mean peripapillary retinal fiber layer thickness (RNFLT) was measured with optical coherence tomography 2 times/year in 28 GS aged 58±8.9 years over 5.0±0.73 years. All patients had a baseline PERG, IOP, and brachial blood pressure measurements in the seated and -10 degrees head-down-body-tilt (HDT) position...
March 3, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/28263183/complexity-of-cardiovascular-rhythms-during-head-up-tilt-test-by-entropy-of-patterns
#20
Dorota Wejer, Beata Graff, Danuta Makowiec, Szymon Budrejko, Zbiginiew Struzik
The head-up tilt (HUT) test, which provokes transient dynamical alterations in the regulation of cardiovascular system, provides insights into complex organization of this system. Based on signals with heart period intervals (RR-intervals) and/or systolic blood pressure (SBP), differences in the cardiovascular regulation between vasovagal patients (VVS) and the healthy people group (CG) are investigated. Short-term relations among signal data represented symbolically by three-beat patterns allow to qualify and quantify the complexity of the cardiovascular regulation by Shannon entropy...
March 6, 2017: Physiological Measurement
keyword
keyword
18953
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"