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https://www.readbyqxmd.com/read/28535914/does-gantry-rotation-time-influence-accuracy-of-volume-computed-tomography-dose-index-ctdivol-in-modern-ct
#1
Atsushi Fukuda, Nao Ichikawa, Yoshiharu Fujita, Pei-Jan Paul Lin, Kosuke Matsubara, Tosiaki Miyati
PURPOSE: The purpose of this study was to develop a gantry overrun corrected CTDIvol (cCTDIvol) dosimetry and evaluate the differences between the displayed CTDIvol (dCTDIvol), measured CTDIvol (mCTDIvol), and the cCTDIvol. METHODS AND MATERIALS: The each 8 rotation times between 275 and 1000ms of two CT scanners were investigated. Rotation time (Trot) and the beam-on time (Tbeam) in axial scanning were measured accurately to determine the gantry overrun time (Tover) as Tbeam-Trot...
May 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28527463/sub-doppler-infrared-spectroscopy-of-ch2oh-radical-in-a-slit-supersonic-jet-vibration-rotation-tunneling-dynamics-in-the-symmetric-ch-stretch-manifold
#2
Michael D Schuder, Fang Wang, Chih-Hsuan Chang, David J Nesbitt
The sub-Doppler CH-symmetric stretch (ν3) infrared absorption spectrum of a hydroxymethyl (CH2OH) radical is observed and analyzed with the radical formed in a slit-jet supersonic discharge expansion (Trot = 18 K) via Cl atom mediated H atom abstraction from methanol. The high sensitivity of the spectrometer and reduced spectral congestion associated with the cooled expansion enable first infrared spectroscopic observation of hydroxymethyl transitions from both ± symmetry tunneling states resulting from large amplitude COH torsional motion...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28490645/evidence-of-adaptations-of-locomotor-neural-drive-in-response-to-enhanced-intermuscular-connectivity-between-the-triceps-surae-muscles-of-the-rat
#3
Michel Bernabei, Jaap H van Dieën, Huub Maas
The aims of this study were to investigate changes (i) in the coordination of activation of the triceps surae muscle group and (ii) in muscle belly length of soleus (SO) and lateral gastrocnemius (LG) during locomotion (trotting) in response to increased stiffness of intermuscular connective tissues in the rat. We measured muscle activation and muscle belly lengths, as well as hindlimb kinematics, before and after an artificial enhancement of the connectivity between SO and LG muscles obtained by implanting a tissue-integrating surgical mesh at the muscles' interface...
May 10, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28474730/three-dimensional-kinematics-of-the-equine-metacarpophalangeal-joint-using-x-ray-reconstruction-of-moving-morphology-a-pilot-study
#4
Bronwen A Childs, Brenna R Pugliese, Cristina T Carballo, Daniel L Miranda, Elizabeth L Brainerd, Carl A Kirker-Head
X-ray reconstruction of moving morphology (XROMM) uses biplanar videoradiography and computed tomography (CT) scanning to capture three-dimensional (3D) bone motion. In XROMM, morphologically accurate 3D bone models derived from CT are animated with motion from videoradiography, yielding a highly accurate and precise reconstruction of skeletal kinematics. We employ this motion analysis technique to characterize metacarpophalangeal joint (MCPJ) motion in the absence and presence of protective legwear in a healthy pony...
May 5, 2017: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/28441406/head-and-pelvic-movement-asymmetries-at-trot-in-riding-horses-in-training-and-perceived-as-free-from-lameness-by-the-owner
#5
Marie Rhodin, Agneta Egenvall, Pia Haubro Andersen, Thilo Pfau
Recent studies evaluating horses in training and considered free from lameness by their owners have identified a large proportion of horses with motion asymmetries. However the prevalence, type and magnitude of asymmetries when trotting in a straight line or on the lunge have not been investigated. The aim of this study was to objectively investigate the presence of motion asymmetries in riding horses in training by identifying the side and quantifying the degree and type (impact, pushoff) of forelimb and hind limb asymmetries found during straight line trot and on the lunge...
2017: PloS One
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
#6
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/28417100/data-for-trots-the-radiotherapy-optimisation-test-set
#7
Sebastiaan Breedveld, Ben Heijmen
The Radiotherapy Optimisation Test Set (TROTS) is an extensive set of problems originating from radiotherapy (radiation therapy) treatment planning. This dataset is created for 2 purposes: (1) to supply a large-scale dense dataset to measure performance and quality of mathematical solvers, and (2) to supply a dataset to investigate the multi-criteria optimisation and decision-making nature of the radiotherapy problem. The dataset contains 120 problems (patients), divided over 6 different treatment protocols/tumour types...
June 2017: Data in Brief
https://www.readbyqxmd.com/read/28399757/lust-for-life
#8
(no author information available yet)
A nurse who lost both legs and an arm after developing sepsis is preparing for globe-trotting adventures following her recovery.
April 12, 2017: Nursing Standard
https://www.readbyqxmd.com/read/28350324/investigation-on-inter-limb-coordination-and-motion-stability-intensity-and-complexity-of-trunk-and-limbs-during-hands-knees-crawling-in-human-adults
#9
Shenglan Ma, Xiang Chen, Shuai Cao, Yi Yu, Xu Zhang
This study aimed to investigate the inter-limb coordination pattern and the stability, intensity, and complexity of the trunk and limbs motions in human crawling under different speeds. Thirty healthy human adults finished hands-knees crawling trials on a treadmill at six different speeds (from 1 km/h to 2.5 km/h). A home-made multi-channel acquisition system consisting of five 3-axis accelerometers (ACC) and four force sensors was used for the data collection. Ipsilateral phase lag was used to represent inter-limb coordination pattern during crawling and power, harmonic ratio, and sample entropy of acceleration signals were adopted to depict the motion intensity, stability, and complexity of trunk and limbs respectively...
March 28, 2017: Sensors
https://www.readbyqxmd.com/read/28345999/variance-associated-with-walking-velocity-during-force-platform-gait-analysis-of-a-heterogeneous-sample-of-clinically-normal-dogs
#10
Alexander M Piazza, Emily E Binversie, Lauren A Baker, Brett Nemke, Susannah J Sample, Peter Muir
OBJECTIVE To determine whether walking at specific ranges of absolute and relative (V*) velocity would aid efficient capture of gait trial data with low ground reaction force (GRF) variance in a heterogeneous sample of dogs. ANIMALS 17 clinically normal dogs of various breeds, ages, and sexes. PROCEDURES Each dog was walked across a force platform at its preferred velocity, with controlled acceleration within 0.5 m/s(2). Ranges in V* were created for height at the highest point of the shoulders (withers; WHV*)...
April 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28325917/a-quadruped-robot-exhibiting-spontaneous-gait-transitions-from-walking-to-trotting-to-galloping
#11
Dai Owaki, Akio Ishiguro
The manner in which quadrupeds change their locomotive patterns-walking, trotting, and galloping-with changing speed is poorly understood. In this paper, we provide evidence for interlimb coordination during gait transitions using a quadruped robot for which coordination between the legs can be self-organized through a simple "central pattern generator" (CPG) model. We demonstrate spontaneous gait transitions between energy-efficient patterns by changing only the parameter related to speed. Interlimb coordination was achieved with the use of local load sensing only without any preprogrammed patterns...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28323361/heart-rate-variability-parameters-in-horses-distinguish-atrial-fibrillation-from-sinus-rhythm-before-and-after-successful-electrical-cardioversion
#12
B Broux, D De Clercq, A Decloedt, S Ven, L Vera, G van Steenkiste, K Mitchell, C Schwarzwald, G van Loon
BACKGROUND: Atrial fibrillation (AF) is the most common pathological arrhythmia in horses. After successful treatment, recurrence is common. Heart rate monitors are easily applicable in horses and some devices offer basic heart rate variability (HRV) calculations. If HRV can be used to distinguish between AF and sinus rhythm (SR), this could become a monitoring tool for horses at risk for recurrence of AF. OBJECTIVES: The purpose of this study was to assess whether in horses AF (before cardioversion) and SR (after cardioversion) can be differentiated based upon HRV parameters...
March 21, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/28298110/near-infrared-overtone-voh-2-%C3%A2-0-spectroscopy-of-ne-h2o-clusters
#13
Michael P Ziemkiewicz, Christian Pluetzer, Michael Wojcik, Jérôme Loreau, Ad van der Avoird, David J Nesbitt
Vibrationally state selective overtone spectroscopy and dynamics of weakly bound Ne-H2O complexes (D0((para)) = 31.67 cm(-1), D0((ortho)) = 34.66 cm(-1)) are reported for the first time, based on near infrared excitation of van der Waals cluster bands correlating with vOH = 2 ← 0 overtone transitions (|02(-)⟩←|00(+)⟩ and |02(+)⟩←|00(+)⟩) out of the ortho (101) and para (000) internal rotor states of the H2O moiety. Quantum theoretical calculations for nuclear motion on a high level ab initio potential energy surface (CCSD(T)/VnZ-f12 (n = 3,4), corrected for basis set superposition error and extrapolated to the complete basis set limit) are employed for assignment of Σ←Σ,Π←Σ, and Σ←Π infrared bands in the overtone spectra, where Σ(K = 0) and Π (K = 1) represent approximate projections (K) of the body angular momentum along the Ne-H2O internuclear axis...
March 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28283369/inertial-sensor-based-system-for-lameness-detection-in-trotting-dogs-with-induced-lameness
#14
RANDOMIZED CONTROLLED TRIAL
M Rhodin, A Bergh, P Gustås, C B Gómez Álvarez
Lameness detection can be challenging in dogs, as reflected in the reported low inter-rater agreement when visually assessing lameness. The aim of this study was to use an inertial sensor-based system to detect and quantify induced distal and proximal limb disturbances mimicking supporting and swinging limb lameness in dogs trotting on a treadmill by measuring vertical head and pelvic movement symmetry. Ten clinically sound dogs were equipped with inertial measurement units that were attached to the head, pelvis and right distal forelimb...
April 2017: Veterinary Journal
https://www.readbyqxmd.com/read/28283082/effects-of-the-rider-on-the-kinematics-of-the-equine-spine-under-the-saddle-during-the-trot-using-inertial-measurement-units-methodological-study-and-preliminary-results
#15
P Martin, L Cheze, P Pourcelot, L Desquilbet, L Duray, H Chateau
Many factors associated with the saddle and the rider could produce pain in horses thus reducing performance. However, studies of horse-saddle-rider interactions are limited and determining their effects remains challenging. The aim of this study was to test a novel method for assessing equine thoracic and lumbar spinal movement under the saddle and collect data during trotting. Back movement was measured using inertial measurement units (n = 5) fixed at the levels of thoracic vertebrae T6, T12 and T16, and lumbar vertebrae L2 and L5...
March 2017: Veterinary Journal
https://www.readbyqxmd.com/read/28283077/ground-reaction-forces-of-elite-dressage-horses-in-collected-trot-and-passage
#16
H M Clayton, H C Schamhardt, S J Hobbs
In this study, sagittal plane ground reaction forces (GRFs) in ridden elite dressage horses performing 'collected trot' and in 'passage' over ground were determined. In-ground force plates captured GRF data from four Dutch Warmblood and four Lusitano horses ridden by their trainers. At least three stance phases were analysed for forelimbs and hind limbs per horse. The variables extracted were vertical and longitudinal (braking, propulsive) force maxima, their times of occurrence and the respective impulses for forelimbs and hind limbs...
March 2017: Veterinary Journal
https://www.readbyqxmd.com/read/28264903/longitudinal-quasi-static-stability-predicts-changes-in-dog-gait-on-rough-terrain
#17
Simon Wilshin, Michelle A Reeve, G Clark Haynes, Shai Revzen, Daniel E Koditschek, Andrew J Spence
Legged animals utilize gait selection to move effectively and must re-cover from environmental perturbations. We show that on rough terrain domestic dogs, Canis lupus familiaris, spend more time in longitudinal quasi-statically stable patterns of movement. Here longitudinal refers to the rostro-caudal, axis. We used an existing model in the literature to quantify the longitudinal quasi-static stability of gaits neighbouring the walk, and found that trot-like gaits are more stable. We thus hypothesized that when perturbed, the rate of return to a stable gait would depend on the direction of perturbation, such that perturbations towards less quasi-statically stable patterns of movement would be more rapid than those towards more stable patterns of movement...
March 6, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28208707/gaitkeeper-a-system-for-measuring-canine-gait
#18
Cassim Ladha, Jack O'Sullivan, Zoe Belshaw, Lucy Asher
It is understood gait has the potential to be used as a window into neurodegenerative disorders, identify markers of subclinical pathology, inform diagnostic algorithms of disease progression and measure the efficacy of interventions. Dogs' gaits are frequently assessed in a veterinary setting to detect signs of lameness. Despite this, a reliable, affordable and objective method to assess lameness in dogs is lacking. Most described canine lameness assessments are subjective, unvalidated and at high risk of bias...
February 8, 2017: Sensors
https://www.readbyqxmd.com/read/28207317/effects-of-sensor-position-on-kinematic-data-obtained-with-an-inertial-sensor-system-during-gait-analysis-of-trotting-horses
#19
Valerie J Moorman, David D Frisbie, Christopher E Kawcak, C Wayne McIlwraith
OBJECTIVE To determine the effects of altering location of right forelimb and pelvic sensors on kinematic data obtained with a commonly used inertial sensor system during gait analysis of trotting horses. DESIGN Experimental study. ANIMALS 12 horses with mild to moderate lameness of at least 1 hind limb, with or without lameness of the forelimbs. PROCEDURES All horses were examined while trotting on a high-speed treadmill. The right forelimb sensor was tested at 3 anatomic locations in random order: dorsal midline and 2 cm medial and lateral to that midline...
March 1, 2017: Journal of the American Veterinary Medical Association
https://www.readbyqxmd.com/read/28202647/longitudinal-and-transversal-displacements-between-triceps-surae-muscles-during-locomotion-of-the-rat
#20
Michel Bernabei, Jaap H van Dieën, Huub Maas
The functional consequences of differential muscle activation and contractile behavior between mechanically coupled synergists are still poorly understood. Even though synergistic muscles exert similar mechanical effects at the joint they span, differences in the anatomy, morphology and neural drive may lead to non-uniform contractile conditions. This study aimed to investigate the patterns of activation and contractile behavior of triceps surae muscles, to understand how these contribute to the relative displacement between the one-joint soleus (SO) and two-joint lateral gastrocnemius (LG) muscle bellies and their distal tendons during locomotion in the rat...
February 15, 2017: Journal of Experimental Biology
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