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Relative motion

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https://www.readbyqxmd.com/read/28211619/intravoxel-incoherent-motion-diffusion-weighted-imaging-of-bone-marrow-in-patients-with-acute-myeloid-leukemia-a-pilot-study-of-prognostic-value
#1
Jinliang Niu, Wenjin Li, Hongwei Wang, Wenqi Wu, Tong Gong, Ning Huang, Jun Wang, Yan Qi
PURPOSE: To investigate the value of intravoxel incoherent motion (IVIM) parameters in evaluation of prognosis in patients with acute myeloid leukemia (AML) before treatment. MATERIALS AND METHODS: Fifty-three patients before standard chemotherapy underwent MRI scans at 1.5 Tesla using conventional diffusion weighted imaging (DWI) and IVIM (b = 0, 10, 25, 50, 100, 200, 400, 600, 800, 1000, 1200 s/mm(2) ) in the sagittal plane covering the lumbar bone marrow...
February 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28211184/night-time-pedestrian-conspicuity-effects-of-clothing-on-drivers-eye-movements
#2
Joanne M Wood, Richard A Tyrrell, Philippe Lacherez, Alex A Black
PURPOSE: Drivers' responses and eye movements were assessed as they approached pedestrians at night in order to explore the relative conspicuity benefits of different configurations of retroreflective markings. METHODS: Eye movements were recorded using an ASL Mobile Eye (Applied Science Technologies, www.asleyetracking.com) from 14 young licensed drivers (M = 24.1 ± 6.4 years) as they drove along a closed-road circuit at night. At two locations, pedestrians walked in place facing either towards or away from the road...
March 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/28210658/patellar-maltracking-persists-in-adolescent-females-with-patellofemoral-pain-a-longitudinal-study
#3
Victor R Carlson, Barry P Boden, Aricia Shen, Jennifer N Jackson, Katharine E Alter, Frances T Sheehan
BACKGROUND: Patellofemoral pain is one of the most common conditions seen in sports medicine practices, particularly among adolescent females. However, the natural history of the underlying pathology in patellofemoral pain during puberty remains poorly understood. PURPOSE: The purpose of this longitudinal study is to assess changes in patellar maltracking patterns in subjects with patellofemoral pain as they mature from mid- to late adolescence. STUDY DESIGN: Cohort study; Level of evidence, 3...
February 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28210064/toe-functions-have-little-effect-on-dynamic-balance-ability-in-elderly-people
#4
Yoshinobu Yoshimoto, Yukitsuna Oyama, Mamoru Tanaka, Asuka Sakamoto
[Purpose] The purpose of this study was to examine the toe function of elderly people and the association with the dynamic balance ability for the developing effective fall-prevention measures. [Subjects and Methods] Seventy-eight participants in a community health service were included in this cross-sectional study. The Timed Up and Go Test and Four Square Step Test were used to test dynamic balance ability. The toe functions related to dynamic balance ability were toe flexion strength, presence or absence of restricted range of motion of the hallux, presence or absence of hallux pain, and hallux valgus angle...
January 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28210029/gender-related-differences-in-lower-limb-alignment-range-of-joint-motion-and-the-incidence-of-sports-injuries-in-japanese-university-athletes
#5
Yasuhiro Mitani
[Purpose] To investigate the gender-related differences in lower limb alignment, range of joint motion, and history of lower limb sports injuries in Japanese university athletes. [Subjects and Methods] The subjects were 224 Japanese university athletes (154 males and 70 females). The quadriceps angle (Q-angle), arch height index, and ranges of internal and external rotation of the hip joints were measured. History of lower limb sports injury was surveyed using a questionnaire. [Results] Females had a significantly higher Q-angle and hip joint internal rotation angle and a significantly lower arch height index than males...
January 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28209898/treadmilling-by-ftsz-filaments-drives-peptidoglycan-synthesis-and-bacterial-cell-division
#6
Alexandre W Bisson-Filho, Yen-Pang Hsu, Georgia R Squyres, Erkin Kuru, Fabai Wu, Calum Jukes, Yingjie Sun, Cees Dekker, Seamus Holden, Michael S VanNieuwenhze, Yves V Brun, Ethan C Garner
The mechanism by which bacteria divide is not well understood. Cell division is mediated by filaments of FtsZ and FtsA (FtsAZ) that recruit septal peptidoglycan-synthesizing enzymes to the division site. To understand how these components coordinate to divide cells, we visualized their movements relative to the dynamics of cell wall synthesis during cytokinesis. We found that the division septum was built at discrete sites that moved around the division plane. FtsAZ filaments treadmilled circumferentially around the division ring and drove the motions of the peptidoglycan-synthesizing enzymes...
February 17, 2017: Science
https://www.readbyqxmd.com/read/28209171/integrated-strategy-for-in-vitro-characterization-of-a-bileaflet-mechanical-aortic-valve
#7
Francesca Maria Susin, Stefania Espa, Riccardo Toninato, Stefania Fortini, Giorgio Querzoli
BACKGROUND: Haemodynamic performance of heart valve prosthesis can be defined as its ability to fully open and completely close during the cardiac cycle, neither overloading heart work nor damaging blood particles when passing through the valve. In this perspective, global and local flow parameters, valve dynamics and blood damage safety of the prosthesis, as well as their mutual interactions, have all to be accounted for when assessing the device functionality. Even though all these issues have been and continue to be widely investigated, they are not usually studied through an integrated approach yet, i...
February 16, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28208466/motion-of-a-colloidal-particle-in-a-nonuniform-director-field-of-a-nematic-liquid-crystal
#8
Beom-Kyu Lee, Sung-Jo Kim, Bohdan Lev, Jong-Hyun Kim
We investigate the dynamics of a single spherical particle immersed in a nematic liquid crystal. A nonuniform director field is imposed on the substrate by a stripe alignment pattern with splay deformation. The particle of homeotropic anchoring at the surface is accompanied by hyperbolic hedgehog or Saturn-ring defects. The particle motion is dependent on the defect structure. We study the two types of motions theoretically and confirm the obtained results experimentally. The particle accompanied by a hyperbolic hedgehog defect is pulled to a deformed region to relax the elastic deformation energy...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208410/local-equilibria-and-state-transfer-of-charged-classical-particles-on-a-helix-in-an-electric-field
#9
J Plettenberg, J Stockhofe, A V Zampetaki, P Schmelcher
We explore the effects of a homogeneous external electric field on the static properties and dynamical behavior of two charged particles confined to a helix. In contrast to the field-free setup which provides a separation of the center-of-mass and relative motion, the existence of an external force perpendicular to the helix axis couples the center-of-mass to the relative degree of freedom leading to equilibria with a localized center of mass. By tuning the external field various fixed points are created and/or annihilated through different bifurcation scenarios...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208320/dynamic-model-for-kinesin-mediated-long-range-transport-and-its-local-traffic-jam-caused-by-tau-proteins
#10
Woochul Nam, Bogdan I Epureanu
In neurons, several intracellular cargoes are transported by motor proteins (kinesins) which walk on microtubules (MTs). However, kinesins can possibly unbind from the MTs before they reach their destinations. The unbound kinesins randomly diffuse in neurons until they bind to MTs. Then, they walk again along the MTs to continue their tasks. Kinesins repeat this cycle of motion until they transport their cargoes to the destinations. However, most previous models mainly focused on the motion of kinesins when they walk on MTs...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208318/microfield-dynamics-in-dense-hydrogen-plasmas-with-high-z-impurities
#11
Stefan P Hau-Riege, Jon Weisheit
We use large-scale classical molecular dynamics to determine microfield properties for several dense plasma mixtures. By employing quantum statistical potentials (QSPs) to regularize the Coulomb interaction, our simulations follow motions of electrons as well as ions for times long enough to track relaxation phenomena involving both types of particles. Coulomb coupling, relative to temperature, of different pairs of species in the hot, dense matter being simulated ranges from weak to strong. We first study the effect of such coupling differences, along with composition and QSP differences, on the roles of electrons and various mixture components in determining probability distributions of instantaneous, total microfields experienced by the ions...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208100/involuntary-eye-motion-correction-in-retinal-optical-coherence-tomography-hardware-or-software-solution
#12
Ahmadreza Baghaie, Zeyun Yu, Roshan M D'Souza
In this paper, we review state-of-the-art techniques to correct eye motion artifacts in Optical Coherence Tomography (OCT) imaging. The methods for eye motion artifact reduction can be categorized into two major classes: (1) hardware-based techniques and (2) software-based techniques. In the first class, additional hardware is mounted onto the OCT scanner to gather information about the eye motion patterns during OCT data acquisition. This information is later processed and applied to the OCT data for creating an anatomically correct representation of the retina, either in an offline or online manner...
February 4, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28207664/descriptive-analysis-of-spinal-neuroaxial-injections-surgical-interventions-and-physical-therapy-utilization-for-degenerative-lumbar-spondylolisthesis-within-medicare-beneficiaries-from-2000-to-2011
#13
Joseph A Sclafani, Alexandra Constantin, Pei-Shu Ho, Venu Akuthota, Leighton Chan
STUDY DESIGN: A retrospective, observational study. OBJECTIVE: The aim of this study was to determine the utilization of various treatment modalities in the management of degenerative spondylolisthesis within Medicare beneficiaries. SUMMARY OF BACKGROUND DATA: Degenerative lumbar spondylolisthesis is a condition often identified in symptomatic low back pain. A variety of treatment algorithms including physical therapy and interventional techniques can be used to manage clinically significant degenerative spondylolisthesis...
February 15, 2017: Spine
https://www.readbyqxmd.com/read/28207503/clamping-drainage-is-unnecessary-after-minimally-invasive-total-knee-arthroplasty-in-patients-with-tranexamic-acid-a-randomized-controlled-trial
#14
Yuangang Wu, Timin Yang, Yi Zeng, Canfeng Li, Bin Shen, Fuxing Pei
BACKGROUND: Drainage and tranexamic acid (TXA) have been widely used in total knee arthroplasty (TKA). However, it remains unclear whether it is necessary to clamp the drain after minimally invasive TKA (MIS-TKA) when TXA is used. We therefore conducted a randomized controlled trial to compare the effects of clamping versus not clamping drainage following MIS-TKA in patients in whom TXA was used. METHODS: From January 2015 to December 2015, 121 patients undergoing unilateral primary MIS-TKA were enrolled and randomly divided into 2 groups...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28207407/deep-pain-exploiting-long-short-term-memory-networks-for-facial-expression-classification
#15
Pau Rodriguez, Guillem Cucurull, Jordi Gonalez, Josep M Gonfaus, Kamal Nasrollahi, Thomas B Moeslund, F Xavier Roca
Pain is an unpleasant feeling that has been shown to be an important factor for the recovery of patients. Since this is costly in human resources and difficult to do objectively, there is the need for automatic systems to measure it. In this paper, contrary to current state-of-the-art techniques in pain assessment, which are based on facial features only, we suggest that the performance can be enhanced by feeding the raw frames to deep learning models, outperforming the latest state-of-the-art results while also directly facing the problem of imbalanced data...
February 9, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28205639/biological-motion-distorts-size-perception
#16
Peter Veto, Wolfgang Einhäuser, Nikolaus F Troje
Visual illusions explore the limits of sensory processing and provide an ideal testbed to study perception. Size illusions - stimuli whose size is consistently misperceived - do not only result from sensory cues, but can also be induced by cognitive factors, such as social status. Here we investigate, whether the ecological relevance of biological motion can also distort perceived size. We asked observers to judge the size of point-light walkers (PLWs), configurations of dots whose movements induce the perception of human movement, and visually matched control stimuli (inverted PLWs)...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28205464/a-new-classification-scheme-for-closed-avulsion-injuries-of-the-flexor-digitorum-profundus-tendon
#17
Mokhtar Abdul Azeem, Yousef Marwan, Ahmed El Morshidy, Ali Esmaeel, Yehia Zakaria
BACKGROUND: Closed avulsion injury of the flexor digitorum profundus (FDP) tendon is a relatively common condition of the hand. Its present classification system seems to be deficient in including all possible patterns of injury, leading to improper selection of the best treatment method for the injury. We aim to provide a new classification scheme for this injury. METHODS: We developed a new classification scheme based on the possible pattern of FDP tendon injury...
March 2017: Journal of Hand Surgery Asian-Pacific Volume
https://www.readbyqxmd.com/read/28204998/discrimination-between-emboli-and-artifacts-for-outpatient-transcranial-doppler-ultrasound-data
#18
Blaise Kévin Guépié, Bruno Sciolla, Fabien Millioz, Marilys Almar, Philippe Delachartre
This paper addresses the detection of emboli in transcranial Doppler ultrasound data acquired from an original portable device. The challenge is the removal of several artifacts (motion and voice) intrinsically related to long-duration (up to 1 h 40 mn per patient) outpatient signals monitoring from this device, as well as high intensities due to the stochastic nature of blood flow. This paper proposes an adapted removal procedure. This firstly consists of reducing the background noise and detecting the blood flow in the time-frequency domain using a likelihood method for contour detection...
February 15, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28203602/hamstring-contracture-after-acl-reconstruction-is-associated-with-an-increased-risk-of-cyclops-syndrome
#19
Francisco Guerra Pinto, Mathieu Thaunat, Matt Daggett, Charles Kajetanek, Tiago Marques, Tales Guimares, Bénédicte Quelard, Bertrand Sonnery-Cottet
BACKGROUND: Cyclops syndrome is characterized by loss of terminal knee extension due to proliferative fibrous nodule formation in the intercondylar notch. This complication occurs in the early postoperative period after anterior cruciate ligament reconstruction (ACLR). The pathogenesis of Cyclops syndrome is not well understood. HYPOTHESIS: Persistent hamstring contracture after ACLR is associated with an increased risk of subsequent Cyclops syndrome. STUDY DESIGN: Case-control study; Level of evidence, 3...
January 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28203586/comparison-of-kinematics-and-tibiofemoral-contact-pressures-for-native-and-transplanted-lateral-menisci
#20
Patrick C McCulloch, Donald Dolce, Hugh L Jones, Andrea Gale, Michael G Hogen, Jason Alder, Jeremiah E Palmer, Philip C Noble
BACKGROUND: Lateral meniscus transplantation is a proven treatment option for the meniscus-deficient knee, yet little is known about meniscal kinematics, strain, and tibiofemoral contact pressure changes after transplantation or the effect of altered root position in lateral meniscus transplantation. PURPOSE: To compare the native lateral meniscal kinematics, strain, and tibiofemoral contact pressures to a best-case scenario meniscus transplant with perfectly matched size and position and to determine how sensitive these factors are to subtle changes in shape and position by using a nonanatomic meniscus transplant position...
December 2016: Orthopaedic Journal of Sports Medicine
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