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3D surface imaging

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https://www.readbyqxmd.com/read/28110313/framework-for-2d-3d-image-fusion-of-infrared-thermography-with-preoperative-mri
#1
Nico Hoffmann, Florian Weidner, Peter Urban, Tobias Meyer, Christian Schnabel, Yordan Radev, Gabriele Schackert, Uwe Petersohn, Edmund Koch, Stefan Gumhold, Gerald Steiner, Matthias Kirsch
Multimodal medical image fusion combines information of one or more images in order to improve the diagnostic value. While previous applications mainly focus on merging images from computed tomography, magnetic resonance imaging (MRI), ultrasonic and single-photon emission computed tomography, we propose a novel approach for the registration and fusion of preoperative 3D MRI with intraoperative 2D infrared thermography. Image-guided neurosurgeries are based on neuronavigation systems, which further allow us track the position and orientation of arbitrary cameras...
January 23, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28110181/dynamic-measurement-of-surface-strain-distribution-on-the-foot-during-walking
#2
Kohta Ito, Kosuke Maeda, Ikumi Fujiwara, Koh Hosoda, Takeo Nagura, Taeyong Lee, Naomichi Ogihara
To clarify the mechanism underlying the development of foot disorders such as diabetic ulcers and deformities, it is important to understand how the foot surface elongates and contracts during gait. Such information is also helpful for improving the prevention and treatment of foot disorders. We therefore measured temporal changes in the strain distribution on the foot surface during human walking. Five adult male participants walked across a glass platform placed over an angled mirror set in a wooden walkway at a self-selected speed and the dorsolateral and plantar surfaces of the foot were filmed using two pairs of synchronized high-speed cameras...
December 18, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28108975/3d-printed-soft-tissue-physical-models-of-renal-malignancies-for-individualized-surgical-simulation-a-feasibility-study
#3
Michael M Maddox, Allison Feibus, James Liu, Julie Wang, Raju Thomas, Jonathan L Silberstein
To construct patient-specific physical three-dimensional (3D) models of renal units with materials that approximates the properties of renal tissue to allow pre-operative and robotic training surgical simulation, 3D physical kidney models were created (3DSystems, Rock Hill, SC) using computerized tomography to segment structures of interest (parenchyma, vasculature, collection system, and tumor). Images were converted to a 3D surface mesh file for fabrication using a multi-jet 3D printer. A novel construction technique was employed to approximate normal renal tissue texture, printers selectively deposited photopolymer material forming the outer shell of the kidney, and subsequently, an agarose gel solution was injected into the inner cavity recreating the spongier renal parenchyma...
January 20, 2017: Journal of Robotic Surgery
https://www.readbyqxmd.com/read/28105805/towards-3d-chemical-imaging-of-ternary-cu-sn-pb-alloys-using-femtosecond-laser-ablation-ionization-mass-spectrometry
#4
Valentine Grimaudo, Pavel Moreno-Garcia, Andreas Riedo, Stefan Meyer, Marek Tulej, Maike Brigitte Neuland, Miklós Mohos, Christoph Gütz, Siegfried R R Waldvogel, Peter Wurz, Peter Broekmann
Femtosecond Laser Ablation/Ionization Mass Spectrometry (LIMS) has been applied to probe the spatial element composition of three ternary Cu-Sn-Pb model bronze alloys (lead bronzes: CuSn10Pb10, CuSn7Pb15 and CuSn5Pb20), which were recently identified as high performance cathode materials in the context of electro-organic synthesis (dehalogenation, deoxygenation) of pharmaceutically relevant building blocks. The quantitative and spatially resolved element analysis of such cathode materials will help understanding the observed profound differences in their electrochemical reactivity and stability...
January 4, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28099202/early-changes-in-facial-profile-following-structured-filler-rhinoplasty-an-anthropometric-analysis-using-a-3-dimensional-imaging-system
#5
Nark Kyoung Rho, Je Young Park, Choon Shik Youn, Soo-Keun Lee, Hei Sung Kim
BACKGROUND: Quantitative measurements are important for objective evaluation of postprocedural outcomes. Three-dimensional (3D) imaging is known as an objective, accurate, and reliable system for quantifying the soft tissue dimensions of the face. OBJECTIVE: To compare the preprocedural and acute postprocedural nasofrontal, nasofacial, nasolabial, and nasomental angles, early changes in the height and length of the nose, and nasal volume using a 3D surface imaging with a light-emitting diode...
January 17, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28096110/bra-sizing-and-the-plastic-surgery-herd-effect-are-breast-augmentation-patients-getting-accurate-information
#6
Christopher R Costa, Kevin H Small, William P Adams
BACKGROUND: Bra sizing is a common method to preoperatively select implants for breast augmentation; however, no series has analyzed the accuracy of this modality postoperatively. Alternatively, previous investigations have validated the accuracy and utility of three-dimensional (3D) imaging for preoperative simulation in breast augmentation. OBJECTIVES: This investigation utilizes 3D analysis to determine if preoperative bra sizing provides equivocal information compared to surgical 3D simulation for patient education and planning prior to a breast augmentation...
January 17, 2017: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/28095486/three-dimensional-assessment-of-temporomandibular-joint-using-mri-cbct-image-registration
#7
Mohammed A Q Al-Saleh, Kumaradevan Punithakumar, Manuel Lagravere, Pierre Boulanger, Jacob L Jaremko, Paul W Major
PURPOSE: To introduce a new approach to reconstruct a 3D model of the TMJ using magnetic resonance imaging (MRI) and cone-beam computed tomography (CBCT) registered images, and to evaluate the intra-examiner reproducibility values of reconstructing the 3D models of the TMJ. METHODS: MRI and CBCT images of five patients (10 TMJs) were obtained. Multiple MRIs and CBCT images were registered using a mutual information based algorithm. The articular disc, condylar head and glenoid fossa were segmented at two different occasions, at least one-week apart, by one investigator, and 3D models were reconstructed...
2017: PloS One
https://www.readbyqxmd.com/read/28094855/technical-note-dose-distributions-in-the-vicinity-of-high-density-implants-using-3d-gel-dosimeters
#8
Andre Asena, Shaun Thomas Smith, Tanya Kairn, Scott Bradley Crowe, Kazuyuki Hosokawa, Steven Sylvander, Jamie Vincent Trapp
PURPOSE: In this work, we develop a methodology for using Fricke gel dosimeters for dose distribution measurements surrounding high-density implants which circumvents artefact production by removing the obstruction during imaging. METHODS: Custom 3D printed moulds were used to set cavities in Fricke gel phantoms to allow for the suspension of high density implants in different geometries. This allowed for the metal valve extracted from a temporary tissue expander to be suspended during irradiation, and removed during optical-CT scanning...
January 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28093261/experimental-evaluation-of-a-new-morphological-approximation-of-the-articular-surfaces-of-the-ankle-joint
#9
Claudio Belvedere, Sorin Siegler, Andrea Ensini, Jason Toy, Paolo Caravaggi, Ramya Namani, Giulia Giannini, Stefano Durante, Alberto Leardini
The mechanical characteristics of the ankle such as its kinematics and load transfer properties are influenced by the geometry of the articulating surfaces. A recent, image-based study found that these surfaces can be approximated by a saddle-shaped, skewed, truncated cone with its apex oriented laterally. The goal of this study was to establish a reliable experimental technique to study the relationship between the geometry of the articular surfaces of the ankle and its mobility and stability characteristics and to use this technique to determine if morphological approximations of the ankle surfaces based on recent discoveries, produce close to normal behavior...
January 7, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28090442/can-mri-accurately-detect-pilon-articular-malreduction-a-quantitative-comparison-between-ct-and-3t-mri-bone-models
#10
Shairah Radzi, Constantin Edmond Dlaska, Gary Cowin, Mark Robinson, Jit Pratap, Michael Andreas Schuetz, Sanjay Mishra, Beat Schmutz
BACKGROUND: Pilon fracture reduction is a challenging surgery. Radiographs are commonly used to assess the quality of reduction, but are limited in revealing the remaining bone incongruities. The study aimed to develop a method in quantifying articular malreductions using 3D computed tomography (CT) and magnetic resonance imaging (MRI) models. METHODS: CT and MRI data were acquired using three pairs of human cadaveric ankle specimens. Common tibial pilon fractures were simulated by performing osteotomies to the ankle specimens...
December 2016: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28089570/use-of-augmented-reality-in-laparoscopic-gynecology-to-visualize-myomas
#11
Nicolas Bourdel, Toby Collins, Daniel Pizarro, Clement Debize, Anne-Sophie Grémeau, Adrien Bartoli, Michel Canis
OBJECTIVE: To report the use of augmented reality (AR) in gynecology. DESIGN: AR is a surgical guidance technology that enables important hidden surface structures to be visualized in endoscopic images. AR has been used for other organs, but never in gynecology and never with a very mobile organ like the uterus. We have developed a new AR approach specifically for uterine surgery and demonstrated its use for myomectomy. SETTING: Tertiary university hospital...
January 12, 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/28081089/direct-comparison-of-two-dimensional-and-three-dimensional-laser-induced-fluorescence-measurements-on-highly-turbulent-flames
#12
Lin Ma, Qingchun Lei, Tyler Capil, Stephen D Hammack, Campbell D Carter
This Letter reports the first direct comparison between two-dimensional (2D) and three-dimensional (3D) laser-induced fluorescence (LIF) applied to highly turbulent flames, with the goal of experimentally illustrating the capabilities and limitations of volumetric LIF (VLIF). To accomplish these goals, planar LIF (PLIF) and VLIF measurements were simultaneously performed on turbulent flames based on the CH radical. The PLIF measurements imaged a planar cross-section of the target flames across a 2D field-of-view (FOV) of 42  mm×42  mm...
January 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28069920/folding-but-not-surface-area-expansion-is-associated-with-cellular-morphological-maturation-in-the-fetal-cerebral-cortex
#13
Xiaojie Wang, Colin Studholme, Peta L Grigsby, Antonio E Frias, Verginia C Cuzon Carlson, Christopher D Kroenke
: Altered macroscopic anatomical characteristics of the cerebral cortex have been identified in individuals affected by various neurodevelopmental disorders. However, the cellular developmental mechanisms that give rise to these abnormalities are not understood. Recently, advances in image reconstruction of diffusion magnetic resonance imaging (diffusion MRI) have made possible high resolution in utero measurements of water diffusion anisotropy in the fetal brain. Here, diffusion anisotropy within the developing fetal cerebral cortex is longitudinally characterized in the rhesus macaque, focusing on gestation days (G) 85 through G135 of the 165 day term...
January 9, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28067508/coherent-brightfield-microscopy-provides-the-spatiotemporal-resolution-to-study-early-stage-viral-infection-in-live-cells
#14
Yi-Fan Huang, Guan-Yu Zhuo, Chun-Yu Chou, Cheng-Hao Lin, Wen Chang, Chia-Lung Hsieh
Viral infection starts with a virus particle landing on a cell surface followed by penetration of the plasma membrane. Due to the difficulty of measuring the rapid motion of small-sized virus particles on the membrane, little is known about how a virus particle reaches an endocytic site after landing at a random location. Here, we use coherent brightfield (COBRI) microscopy to investigate early stage viral infection with ultrahigh spatiotemporal resolution. By detecting intrinsic scattered light via imaging-based interferometry, COBRI microscopy allows us to track the motion of a single vaccinia virus particle with nanometer spatial precision (<3 nm) in 3D and microsecond temporal resolution (up to 100,000 frames per second)...
January 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28065308/studying-cytokinesis-and-midbody-remnants-using-correlative-light-scanning-em
#15
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/28063264/preimplantation-3d-ultrasound-current-uses-and-challenges
#16
Sushila Arya, Sanja Kupesic Plavsic
The preimplantation ultrasound (US) refers to targeted imaging of the uterus and adnexa prior to assisted reproductive techniques (ART) to optimize the infertility treatment outcomes. After a thorough evidence based literature review, we propose the use of transvaginal three-dimensional (3D) US during the early follicular phase. A systematic approach for 3D US examination consists of a detailed examination of the uterine shape, size and contour, evaluation of the endometrial thickness, volume, pattern and vascularity, and assessment of the junctional zone regularity, echogenicity and thickness...
January 7, 2017: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/28060777/ptcda-growth-on-ge-111-c-2x8-surfaces-a-scanning-tunneling-microscopy-study
#17
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/28060270/building-finite-element-models-to-investigate-zebrafish-jaw-biomechanics
#18
Lucy H Brunt, Karen A Roddy, Emily J Rayfield, Chrissy L Hammond
Skeletal morphogenesis occurs through tightly regulated cell behaviors during development; many cell types alter their behavior in response to mechanical strain. Skeletal joints are subjected to dynamic mechanical loading. Finite element analysis (FEA) is a computational method, frequently used in engineering that can predict how a material or structure will respond to mechanical input. By dividing a whole system (in this case the zebrafish jaw skeleton) into a mesh of smaller 'finite elements', FEA can be used to calculate the mechanical response of the structure to external loads...
December 3, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28059427/evaluation-of-peg-coated-iron-oxide-nanoparticles-as-blood-pool-tracers-for-preclinical-magnetic-particle-imaging
#19
A P Khandhar, P Keselman, S J Kemp, R M Ferguson, P W Goodwill, S M Conolly, K M Krishnan
Superparamagnetic iron oxide (SPIO) nanoparticles with optimized and well-characterized properties are critical for Magnetic Particle Imaging (MPI). MPI is a novel in vivo imaging modality that promises to integrate the speed of X-ray CT, safety of MRI and sensitivity of PET. Since SPIOs are the source of MPI signal, both the core and surface properties must be optimized to enable efficient in vivo imaging with pharmacokinetics tailored for specific imaging applications. Existing SPIOs like Resovist (ferucarbotran) provide a suboptimal MPI signal, and further limit MPI's in vivo utility due to rapid systemic clearance...
January 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28059290/self-calibration-single-lens-3d-video-extensometer-for-high-accuracy-and-real-time-strain-measurement
#20
Xinxing Shao, Mohammed Mokhtar Eisa, Zhenning Chen, Shuai Dong, Xiaoyuan He
The accuracy of strain measurement using a common optical extensometer with two-dimensional (2D) digital image correlation (DIC) is not sufficient for experimental applications due to the effect of out-of-plane motion. Although three-dimensional (3D) DIC can measure all three components of displacement without introducing in-plane displacement errors, 3D-DIC requires the stringent synchronization between two digital cameras and requires complicated system calibration of binocular stereovision, which makes the measurement rather inconvenient...
December 26, 2016: Optics Express
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