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https://www.readbyqxmd.com/read/28715090/learning-based-automated-segmentation-of-the-carotid-artery-vessel-wall-in-dual-sequence-mri-using-subdivision-surface-fitting
#1
Shan Gao, Ronald Van't Klooster, Pieter H Kitslaar, Bram F Coolen, Alexandra M van den Berg, Loek P Smits, Rahil Shahzad, Denis P Shamonin, Patrick J H de Koning, Aart J Nederveen, Rob J van der Geest
PURPOSE: The quantification of vessel wall morphology and plaque burden requires vessel segmentation, which is generally performed by manual delineations. The purpose of our work is to develop and evaluate a new 3D model-based approach for carotid artery wall segmentation from dual-sequence MRI. METHODS: The proposed method segments the lumen and outer wall surfaces including the bifurcation region by fitting a subdivision surface constructed hierarchical-tree model to the image data...
July 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28714634/-pectus-excavatumn-and-carinatum-in-children-and-adolescents-what-to-say-what-to-do
#2
Pierre Lascombes, Isabelle Ruchonnet-Métrailler, Maurice Beghetti, Armand Bottani, James Wilde
In children presenting with a pectus excavatum (PE) or pectus carinatum (PC) an underlying syndrome including Marfan's syndrome needs to be excluded. In adolescents, severe chest wall deformities may cause cardiac or respiratory problems but most commonly they have a psychological impact. The conservative treatment is a Vacuum Bell for PE, and a Dynamic Compression System for PC ; they play an increasing role in young patients. These devices need to be worn multiple hours per day for several months for an optimal result...
February 15, 2017: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28711025/three-dimensional-mechano-electrochemical-model-for-smooth-muscle-contraction-of-the-urinary-bladder
#3
Robert Seydewitz, Robin Menzel, Tobias Siebert, Markus Böl
The urinary bladder is a central organ of vertebrates and imposes, based on its extreme deformation (volume changes up to several 100%), special requirements on the overall bladder tissue. However, studies focusing on three-dimensional modelling of bladder deformation and bladder function during micturition are rare. Based on three fields, namely, the membrane potential, calcium concentration, and placement, a mechano-electrochemical-coupled, three-dimensional model describing the contractile behaviour of urinary bladder smooth muscle is presented using a strain energy function...
April 12, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28709335/entropic-multirelaxation-time-lattice-boltzmann-method-for-moving-and-deforming-geometries-in-three-dimensions
#4
B Dorschner, S S Chikatamarla, I V Karlin
Entropic lattice Boltzmann methods have been developed to alleviate intrinsic stability issues of lattice Boltzmann models for under-resolved simulations. Its reliability in combination with moving objects was established for various laminar benchmark flows in two dimensions in our previous work [B. Dorschner, S. Chikatamarla, F. Bösch, and I. Karlin, J. Comput. Phys. 295, 340 (2015)JCTPAH0021-999110.1016/j.jcp.2015.04.017] as well as for three-dimensional one-way coupled simulations of engine-type geometries in B...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28699920/systematic-periodicity-in-waviness-of-vertically-aligned-carbon-nanotubes-explained-by-helical-buckling
#5
Mehdi Jahangiri
A hypothesis is proposed in this work to account for the geometry of individual vertically aligned carbon nanotubes (VACNTs) that not only justifies the directionality of their growth, but also explains the origin of the waviness frequently reported for these nanotube forests. Such waviness has fundamental effects on the transport/conduction properties of VACNTs, either through or along them, regarding phenomena such as mass, stress, heat and electricity. Despite the general opinion about randomness of CNTs tortuosity, we demonstrate here that rules of helical buckling of tubular strings is applicable to VACNTs, based on which a regular 3D helical geometry is proposed for VACNTs, with a 2D sine wave shape side-profile...
July 12, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28689753/comparison-of-left-ventricular-function-and-myocardial-infarct-size-determined-by-2-dimensional-speckle-tracking-echocardiography-in-patients-with-and-without-chronic-obstructive-pulmonary-disease-after-st-segment-elevation-myocardial-infarction
#6
Laurien Goedemans, Rachid Abou, Georgette E Hoogslag, Nina Ajmone Marsan, Christian Taube, Victoria Delgado, Jeroen J Bax
Patients with chronic obstructive pulmonary disease (COPD) have a high risk of mortality after acute ST-segment elevation myocardial infarction (STEMI). We compared STEMI patients with versus without COPD in terms of infarct size and left ventricular (LV) systolic function using advanced 2-dimensional speckle tracking echocardiography. Of 1,750 patients with STEMI (mean age 61 ± 12 years, 76% male), 133 (7.6%) had COPD. With transthoracic echocardiography, left ventricular ejection fraction (LVEF) and wall motion score index were measured...
June 15, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28687851/microstructural-crimp-of-the-lamina-cribrosa-and-peripapillary-sclera-collagen-fibers
#7
Ning-Jiun Jan, Celeste Gomez, Saundria Moed, Andrew P Voorhees, Joel S Schuman, Richard A Bilonick, Ian A Sigal
Purpose: Although collagen microstructural crimp is a major determinant of ocular biomechanics, no direct measurements of optic nerve head (ONH) crimp have been reported. Our goal was to characterize the crimp period of the lamina cribrosa (LC) and peripapillary sclera (PPS) at low and normal IOPs. Methods: ONHs from 11 sheep eyes were fixed at 10-, 5-, or 0-mm Hg IOP and crimp periods measured manually from coronal cryosections imaged with polarized light microscopy (PLM)...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28664198/3d-motion-modeling-and-reconstruction-of-left-ventricle-wall-in-cardiac-mri
#8
Dong Yang, Pengxiang Wu, Chaowei Tan, Kilian M Pohl, Leon Axel, Dimitris Metaxas
The analysis of left ventricle (LV) wall motion is a critical step for understanding cardiac functioning mechanisms and clinical diagnosis of ventricular diseases. We present a novel approach for 3D motion modeling and analysis of LV wall in cardiac magnetic resonance imaging (MRI). First, a fully convolutional network (FCN) is deployed to initialize myocardium contours in 2D MR slices. Then, we propose an image registration algorithm to align MR slices in space and minimize the undesirable motion artifacts from inconsistent respiration...
June 2017: Functional Imaging and Modeling of the Heart: ... International Workshop, FIMH ..., Proceedings. FIMH
https://www.readbyqxmd.com/read/28662867/thoracic-outlet-syndrome-after-the-nuss-procedure-for-pectus-excavatum-is-it-a-rare-complication
#9
Tomohisa Nagasao, Tadaaki Morotomi, Motone Kuriyama, Tetsukuni Kogure, Hirro Kudo, Yusuke Hamamoto, Motoki Tamai
OBJECTIVE: The present study aims to elucidate the frequency of thoracic outlet syndrome after the Nuss procedure for pectus excavatum and the conditions in which thoracic outlet syndrome is likely to develop. METHODS: A retrospective study including 85 pectus excavatum patients (58 males and 27 females) was conducted. Thoracic outlet syndrome was defined as a condition in which the patient has numbness, lassitude, or pain of the upper limbs at rest or during motion of the upper limbs...
June 3, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28661600/-criteria-and-clinical-significance-of-echographic-patterns-of-the-left-ventriculus-anomalous-deformity
#10
A S Matvashchuk, M V Kostvivev
With the aim of the clinical significance studying of the abnormal myocardial deforma- tion (MD) patterns in left ventricle (LV) there were examined 45 patients, in whom oper- ative myocardial revascularization was performed for an ischemic heart disease. Also 31 volunteers were examined. Postsystolic myocardial contruction (PMC) of the LV, depending on its mechanism, was classified: in absence of the affection - PMC-0, in presence of myocardial ischemia - PMC-1, in loss of contractility - PMC-2a, in loss of elasticity - PMC-2b...
August 2016: Klinichna Khirurhiia
https://www.readbyqxmd.com/read/28652932/a-study-of-the-progression-of-damage-in-an-axially-loaded-branta-leucopsis-femur-using-x-ray-computed-tomography-and-digital-image-correlation
#11
Zartasha Mustansar, Samuel A McDonald, William Irvin Sellers, Phillip Lars Manning, Tristan Lowe, Philip J Withers, Lee Margetts
This paper uses X-ray computed tomography to track the mechanical response of a vertebrate (Barnacle goose) long bone subjected to an axial compressive load, which is increased gradually until failure. A loading rig was mounted in an X-ray computed tomography system so that a time-lapse sequence of three-dimensional (3D) images of the bone's internal (cancellous or trabecular) structure could be recorded during loading. Five distinct types of deformation mechanism were observed in the cancellous part of the bone...
2017: PeerJ
https://www.readbyqxmd.com/read/28649146/a-predictive-framework-to-elucidate-venous-stenosis-cfd-shape-optimization
#12
S M Javid Mahmoudzadeh Akherat, Kevin Cassel, Michael Boghosian, Mary Hammes, Fredric Coe
The surgical creation of vascular accesses for renal failure patients provides an abnormally high flow rate conduit in the patient's upper arm vasculature that facilitates the hemodialysis treatment. These vascular accesses, however, are very often associated with complications that lead to access failure and thrombotic incidents, mainly due to excessive neointimal hyperplasia (NH) and subsequently stenosis. Development of a framework to monitor and predict the evolution of the venous system post access creation can greatly contribute to maintaining access patency...
July 1, 2017: Computer Methods in Applied Mechanics and Engineering
https://www.readbyqxmd.com/read/28648673/clinical-evaluation-of-active-abdominal-lifting-and-compression-cardiopulmonary-resuscitation-in-patients-with-cardiac-arrest
#13
Min Li, Wei Song, Yan-Hong Ouyang, Duo-Hu Wu, Jun Zhang, Li-Xiang Wang, Jing Li
BACKGROUND: Chest compression is a standard recommendation during cardiopulmonary resuscitation (CPR). However, chest compression cannot be effectively applied under certain situations, such as chest wall deformity, rib fracture, or hemopneumothorax. An alternative method, abdominal compression, was reported to achieve better resuscitation outcomes in these patients. MATERIALS AND METHODS: A prospective study was performed in adult patients with cardiac arrest and anticipated ineffective chest compression (thoracic trauma, chest deformity, rib fracture, and hemopneumothorax)...
June 17, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28648119/is-there-a-relationship-between-increased-aortic-stiffness-and-segmental-left-ventricular-deformation-in-elite-athletes-insights-from-the-magyar-sport-study
#14
A Nemes, A Kalapos, P Domsik, M Oszlánczi, C Lengyel, L Balogh, T Forster
Introduction Myocardial contractility of the left ventricle (LV) is related to arterial distensibility. Sport activity is frequently associated with changes in both LV and arterial functions. This study aimed to find correlations between three-dimensional speckle-tracking echocardiography-derived segmental LV deformation parameters and echocardiographically assessed aortic stiffness index (ASI) in athletes. This study comprised 26 young elite athletes (mean age: 26.7 ± 8.4 years, nine men). Results Among segmental circumferential strains (CSs), only that of apical anterior (r = 0...
June 1, 2017: Physiology International
https://www.readbyqxmd.com/read/28642192/applications-of-3d-orbital-computer-assisted-surgery-cas
#15
P Scolozzi
INTRODUCTION: The purpose of the present report is to describe the indications for use of 3D orbital computer-assisted surgery (CAS). PATIENTS AND METHODS: We analyzed the clinical and radiological data of all patients with orbital deformities treated using intra-operative navigation and CAD/CAM techniques at the Hôpitaux Universitaires de Genève, Switzerland, between 2009 and 2016. We recorded age and gender, orbital deformity, technical and surgical procedure and postoperative complications...
June 19, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28636819/superelastic-pseudocapacitors-from-freestanding-mno2-decorated-graphene-coated-carbon-nanotube-aerogels
#16
Yepin Zhao, Maxwell P Li, Siyuan Liu, Mohammad F Islam
In recent years, the demand for emerging electronic devices has driven efforts to develop electrochemical capacitors with high power and energy densities that can preserve capacitance under and after recovery from mechanical deformation. We have developed superelastic pseudocapacitors using ∼1.5 mm thick graphene-coated single-walled carbon nanotube (SWCNT) aerogels decorated with manganese oxide (MnO2) as freestanding electrodes that retain high volumetric capacitance and electrochemical stability before, under, and after recovery from 50% compression...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28626162/intervention-of-the-nuss-procedure-on-the-mental-health-of-pectus-excavatum-patients
#17
Li Luo, Bo Xu, Xinling Wang, Bo Tan, Jing Zhao
Pectus excavatum (PE) is the most common congenital chest wall deformity, but little is known about the influence of the Nuss surgical procedure on mental health of patients with PE. In this study, we aimed to evaluate the influence of the PE Nuss surgical procedure on mental health in Chinese patients and identify the predictors of psychological status for PE. Patients with PE (n = 266) underwent a standard surgical procedure by the same surgeon and did the Symptom Checklist 90 (SCL-90) and the Self-rating Depression Scale (SDS) questionnaires before and 1 year after surgery...
June 16, 2017: Annals of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28624480/evaluation-of-thoracic-vertebrae-rotation-in-patients-with-pectus-excavatum
#18
Ryszard Tomaszewski, Łukasz Wiktor, Ludwina Machała
PURPOSE: The aim of our study was to evaluate thoracic vertebrae rotation in patients with pectus excavatum. Moreover, we wanted to assess the prevalence, the severity and relationship between pectus excavatum and adolescent idiopathic scoliosis (AIS). METHODS: We performed retrospective analysis of 82 preoperative chest CT in children with pectus excavatum performed between January 2008 and December 2011. For each patient Haller Index and Cobb angle was measured...
June 14, 2017: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/28620745/strain-imaging-using-cardiac-magnetic-resonance
#19
REVIEW
A Scatteia, A Baritussio, C Bucciarelli-Ducci
The objective assessments of left ventricular (LV) and right ventricular (RV) ejection fractions (EFs) are the main important tasks of routine cardiovascular magnetic resonance (CMR). Over the years, CMR has emerged as the reference standard for the evaluation of biventricular morphology and function. However, changes in EF may occur in the late stages of the majority of cardiac diseases, and being a measure of global function, it has limited sensitivity for identifying regional myocardial impairment. On the other hand, current wall motion evaluation is done on a subjective basis and subjective, qualitative analysis has a substantial error rate...
July 2017: Heart Failure Reviews
https://www.readbyqxmd.com/read/28618768/psychosocial-functioning-in-pediatric-patients-with-pectus-excavatum-and-pectus-carinatum
#20
Aliye Tuğba Bahadir, Pınar Kuru Bektaşoğlu, Aylin Çakiroğlu Eser, Ceyda Afacan, Mustafa Yüksel
BACKGROUND/AIM: Pectus excavatum and pectus carinatum are the most commonly seen anterior chest wall deformities. Recent studies reveal that minimal invasive repair of pectus deformities improves the quality of life. Our aim is to assess the psychosocial functioning and sociodemographic characteristics of pediatric patients with pectus deformities and evaluate the differences between patients operated on with minimal invasive repair techniques and nonoperated patients. MATERIALS AND METHODS:  Thirty-two patients with pectus deformities who were operated on 6 months or more before and 31 nonoperated patients participated in the study...
June 12, 2017: Turkish Journal of Medical Sciences
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