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https://www.readbyqxmd.com/read/28088072/microstructural-mechanical-and-corrosion-characteristics-of-heat-treated-mg-1-2zn-0-5ca-wt-alloy-for-use-as-resorbable-bone-fixation-material
#1
Hamdy Ibrahim, Andrew D Klarner, Behrang Poorganji, David Dean, Alan A Luo, Mohammad Elahinia
Mg-Zn-Ca alloys have grabbed most of the recent attention in research attempting to develop an Mg alloy for bone fixation devices due to their superior biocompatibility. However, early resorption and insufficient strength remain the main problems that hinder their use. Heat treatment has previously been thoroughly studied as a post-shaping process, especially after the fabrication of complex parts (e.g. porous structures) by 3D-printing or powder metallurgy. In this work, the effect of heat treatment on Mg-1...
January 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28080029/one-step-fabrication-of-3d-nano-hierarchical-ni-nanomace-array-to-sinter-with-ag-nps-and-the-interfacial-analysis
#2
Wei Zhou, Zhen Zheng, Chunqing Wang, Zhongtao Wang, Rong An
Three-dimensional (3D) nano-hierarchical Ni nanomace (Ni NM) array was fabricated on copper substrate by only one step with electroplating method, the unique structure was covered with Au film (Ni/Au NM) without changing its morphology and in the following step, it was sintered with silver nanoparticle (Ag NP) paste. The structure of Ni NM array and its surface morphology were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Atomic Force Microscope (AFM). The sintered interface was investigated by SEM, Transmission Electron Microscopy (TEM) and Energy-Dispersive X-Ray Spectroscopy (EDS) to analyze the sintering mechanism...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28065308/studying-cytokinesis-and-midbody-remnants-using-correlative-light-scanning-em
#3
S Frémont, A Echard
Cytokinesis is an essential step of cell proliferation leading to the physical separation of the dividing cells. Cytokinesis relies on both large scale and local scale cell shape changes, and terminates with the final abscission cut that requires close apposition of the plasma membrane. While furrow ingression is a prominent feature of the early phase of cytokinesis and is easy to visualize in all models, from dividing eggs to culture cells, the later steps of cytokinesis until abscission can be much more difficult to visualize...
2017: Methods in Cell Biology
https://www.readbyqxmd.com/read/28064003/a-semi-automated-quantitative-ct-method-for-measuring-rotator-cuff-muscle-degeneration-in-shoulders-with-primary-osteoarthritis
#4
Alexandre Terrier, Julien Ston, Antoine Dewarrat, Fabio Becce, Alain Farron
BACKGROUND: Rotator cuff muscle degeneration is an important parameter to consider when planning shoulder arthroplasty. HYPOTHESIS: We hypothesized that rotator cuff muscle degeneration is correlated with scapulohumeral subluxation in patients planned for anatomical total shoulder arthroplasty (TSA). MATERIALS AND METHODS: We developed a semi-automated quantitative CT method to measure rotator cuff muscle degeneration, and retrospectively analyzed 107 preoperative shoulder CT scans of patients with primary osteoarthritis...
January 4, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28060777/ptcda-growth-on-ge-111-c-2x8-surfaces-a-scanning-tunneling-microscopy-study
#5
Antonio Martínez-Galera, Zheng Wei, Nicoleta Nicoara, Ivan Brihuega, Jose M Gomez-Rodriguez
The initial stages of growth of PTCDA (3,4,9,10 perylene tetracarboxylic dianhydride) at room temperature (RT) on Ge(111)-c(2x8) surfaces have been studied by means of scanning tunneling microscopy (STM) under ultrahigh vacuum conditions. The results show that PTCDA molecules have a high mobility at RT on the well ordered areas of the semiconductor substrate, since nucleation is only observed in domain walls, steps and surface defects. However, no molecular ordering has been detected at submonolayer coverage...
January 6, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28059258/guide-to-quickly-build-high-quality-three-dimensional-models-with-a-structured-light-range-scanner
#6
Bao-Quan Shi, Jin Liang
In literature, there are many reports about how to build high-precision, high-speed, and/or flexibly structured light range scanners. Whereas, there are few papers reported about how to implement the scanning to reach the full potential of the scanners when digitizing various objects. In this paper, some scanning strategies adopted by the structured light range scanner XJTUOM are introduced. In order to build high-quality three-dimensional (3D) models for various applications, such as 3D inspection, if necessary, the object surface is prepared in advance by an application of coating spray...
December 20, 2016: Applied Optics
https://www.readbyqxmd.com/read/28059251/high-definition-optical-coherence-tomography-imaging-for-noninvasive-examination-of-heritage-works
#7
Farzana Zaki, Isabella Hou, Denver Cooper, Divya Patel, Yi Yang, Xuan Liu
Cultural heritage works, such as ancient murals and historical paintings, are examined routinely for the purpose of conservation. Previous works have applied optical coherence tomography (OCT), which is a three-dimensional (3D) microscopic imaging modality in the field of heritage works conservation. The data acquired by OCT provides both 3D surface information of the object and structure information underneath the surface. Therefore, cross-sectional information on the object can be utilized to study layer structure of the painting and brush stroke techniques used by the artist...
December 20, 2016: Applied Optics
https://www.readbyqxmd.com/read/28049718/patterns-of-organelle-ontogeny-through-a-cell-cycle-revealed-by-whole-cell-reconstructions-using-3d-electron-microscopy
#8
Louise Hughes, Samantha Borrett, Katie Towers, Tobias Starborg, Sue Vaughan
The major mammalian bloodstream form of the African sleeping sickness parasite Trypanosoma brucei multiplies rapidly and it is important to understand how these cells divide. Organelle inheritance involves complex spatiotemporal re-arrangements to ensure correct distribution to daughter cells. Serial block face scanning electron microscopy (SBF-SEM) was used to reconstruct whole individual cells at different stages of the cell cycle to give an unprecedented temporal, spatial and quantitative view of organelle division, inheritance and abscission in a eukaryotic cell...
January 3, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28048702/tu-h-brc-01-a-new-fabrication-method-for-secondary-skin-collimation-using-3d-scanner-and-3d-printer
#9
J Jung, N Potter, T Suh, C Liu, B Lu
PURPOSE: Using secondary skin collimation (SSC) to protect the critical organ surrounding the tumors is always desirable for electron and/or ortho-voltage treatments. However, the time-consuming and labor-intensive fabrication processes of current method (manually fabricate the lead mask) restrict the general use of SSC. The aim of this study is to develop a new SSC fabrication method using 3D scanning and 3D printing technologies in order to largely decrease the human labor involvement and fabrication time, also improve the fabrication accuracy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048436/su-c-201-02-dosimetric-verification-of-sbrt-with-fff-vmat-using-a-3-d-radiochromic-optical-ct-dosimetry-system
#10
Y Na, P Black, J Adamovics, C Wuu
PURPOSE: With an increasing use of small field size and high dose rate irradiation in the advances of radiotherapy techniques, such as stereotactic body radiotherapy (SBRT) and stereotactic radiosurgery (SRS), an in-depth quality assurance (QA) system is required. The purpose of this study is to investigate a high resolution optical CT-based 3D radiochromic dosimetry system for SBRT with intensity modulated radiotherapy (IMRT) and flattening filter free (FFF) volumetric modulated arc therapy (VMAT)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048170/mo-g-201-03-deep-learning-based-prediction-of-achievable-dose-for-personalizing-inverse-treatment-planning
#11
M Mardani Korani, P Dong, L Xing
PURPOSE: Inverse planning starts with prescribed dose or DVHs. The time/effort spent on obtaining a clinically acceptable plan and, more importantly, the quality of the resultant treatment plan depends critically on the prescription. The present work aims to facilitate the treatment planning workflow by predicting the achievable dose distribution based on a dataset of quality plans designed for past patients. METHODS: A novel learning-empowered approach is developed that predicts achievable 3D dose volume for a new patient based on the geometrical features of the contoured anatomical-scan...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047923/tu-h-brc-08-use-and-validation-of-flexible-3d-printed-tissue-compensators-for-post-mastectomy-radiation-therapy
#12
D Craft, W Woodward, J Kanke, S Kry, M Salehpour, R Howell
PURPOSE: Patient-specific tissue equivalent compensators can be used for post-mastectomy radiation therapy (PMRT) to achieve homogenous dose distributions with single-field treatments. However, current fabrication methods are time consuming and expensive. 3D-printing technology could overcome these limitations. The purposes of this study were to [1] evaluate materials for 3D-printed compensators [2] design and print a compensator to achieve a uniform thickness to a clinical target volume (CTV), and [3] demonstrate that a single-field electron compensator plan is a clinically feasible treatment option for PMRT...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047865/we-de-bra-10-development-of-a-novel-scanning-beam-low-energy-intraoperative-radiation-therapy-sbiort-system-for-pancreatic-cancer
#13
B Wears, I Mohiuddin, R Flynn, T Waldron, Y Kim, B Allen, J Xia
PURPOSE: Developing a compact collimator system and validating a 3D surface imaging module for a scanning beam low-energy x-ray radiation therapy (SBIORT) system that enables delivery of non-uniform radiation dose to targets with irregular shapes intraoperatively. METHODS: SBIORT consists of a low energy x-ray source, a custom compact collimator module, a robotic arm, and a 3D surface imaging module. The 3D surface imaging system (structure sensor) is utilized for treatment planning and motion monitoring of the surgical cavity...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047657/su-f-j-140-using-handheld-stereo-depth-cameras-to-extend-medical-imaging-for-radiation-therapy-planning
#14
C Jenkins, L Xing, S Yu
PURPOSE: A correct body contour is essential for the accuracy of dose calculation in radiation therapy. While modern medical imaging technologies provide highly accurate representations of body contours, there are times when a patient's anatomy cannot be fully captured or there is a lack of easy access to CT/MRI scanning. Recently, handheld cameras have emerged that are capable of performing three dimensional (3D) scans of patient surface anatomy. By combining 3D camera and medical imaging data, the patient's surface contour can be fully captured...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047056/th-ef-brb-03-significant-cord-and-esophagus-dose-reduction-by-4%C3%AF-non-coplanar-spine-stereotactic-body-radiation-therapy-and-stereotactic-radiosurgery
#15
V Yu, A Tran, D Nguyen, K Woods, M Cao, T Kaprealian, R Chin, D Low, K Sheng
PURPOSE: To demonstrate significant organ-at-risk (OAR) sparing achievable with 4π non-coplanar radiotherapy on spine SBRT and SRS patients. METHODS: Twenty-five stereotactic spine cases previously treated with VMAT (n = 23) or IMRT (n = 2) were included in this study. A computer-aided-design model of a Linac with a 3D-scanned human surface was utilized to determine the feasible beam space throughout the 4π steradian and beam specific source-to-target-distances (STD) required for collision avoidance...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046712/mo-fg-202-03-efficient-data-collection-of-continuous-2d-and-discrete-relative-dosimetric-data-for-annual-linac-qa-using-truebeam-developer-mode-and-a-1d-scanning-tank
#16
N Knutson, M Schmidt, N Nguyen, M Belley, M Price
PURPOSE: To develop a method to exploit real-time dynamic machine and couch parameter control during linear accelerator (LINAC) beam delivery to facilitate efficient performance of TG-142 suggested, Annual LINAC QA tests. METHODS: Varian's TrueBeam Developer Mode (Varian Medical Systems, Palo Alto, CA) facilitates control of Varian's TrueBeam LINAC via instructions provided in Extensible Markup Language (XML) files. This allows machine and couch parameters to be varied dynamically, in real-time, during beam delivery...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046509/su-c-bra-06-automatic-brain-tumor-segmentation-for-stereotactic-radiosurgery-applications
#17
Y Liu, S Stojadinovic, S Jiang, R Timmerman, R Abdulrahman, L Nedzi, X Gu
PURPOSE: Stereotactic radiosurgery (SRS), which delivers a potent dose of highly conformal radiation to the target in a single fraction, requires accurate tumor delineation for treatment planning. We present an automatic segmentation strategy, that synergizes intensity histogram thresholding, super-voxel clustering, and level-set based contour evolving methods to efficiently and accurately delineate SRS brain tumors on contrast-enhance T1-weighted (T1c) Magnetic Resonance Images (MRI)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046391/su-d-brc-07-system-design-for-a-3d-volumetric-scintillation-detector-using-scmos-cameras
#18
C Darne, D Robertson, F Alsanea, S Beddar
PURPOSE: The purpose of this project is to build a volumetric scintillation detector for quantitative imaging of 3D dose distributions of proton beams accurately in near real-time. METHODS: The liquid scintillator (LS) detector consists of a transparent acrylic tank (20×20×20 cm(3) ) filled with a liquid scintillator that when irradiated with protons generates scintillation light. To track rapid spatial and dose variations in spot scanning proton beams we used three scientific-complementary metal-oxide semiconductor (sCMOS) imagers (2560×2160 pixels)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046320/we-fg-206-06-dual-input-tracer-kinetic-modeling-and-its-analog-implementation-for-dynamic-contrast-enhanced-dce-mri-of-malignant-mesothelioma-mpm
#19
S Lee, A Rimner, S Hayes, M Hunt, J Deasy, M Zauderer, V Rusch, N Tyagi
PURPOSE: To use dual-input tracer kinetic modeling of the lung for mapping spatial heterogeneity of various kinetic parameters in malignant MPM METHODS: Six MPM patients received DCE-MRI as part of their radiation therapy simulation scan. 5 patients had the epitheloid subtype of MPM, while one was biphasic. A 3D fast-field echo sequence with TR/TE/Flip angle of 3.62ms/1.69ms/15° was used for DCE-MRI acquisition. The scan was collected for 5 minutes with a temporal resolution of 5ߝ9 seconds depending on the spatial extent of the tumor...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28036182/shape-induced-deformation-capillary-bridging-and-self-assembly-of-cuboids-at-the-fluid-fluid-interface
#20
Thriveni G Anjali, Madivala G Basavaraj
The controlled assembly of anisotropic particles through shape-induced interface deformations is shown to be a potential route for the fabrication of novel functional materials. In this article, the shape-induced interface deformation, capillary bridging, and directed self-assembly of cuboidal-shaped hematite particles at fluid-fluid interfaces are reported. The multipolar nature of the interface distortions is directly visualized using high-resolution scanning electron microscopy and 3D optical surface profiling...
January 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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