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https://www.readbyqxmd.com/read/29342968/a-fast-and-robust-extrinsic-calibration-for-rgb-d-camera-networks
#1
Po-Chang Su, Ju Shen, Wanxin Xu, Sen-Ching S Cheung, Ying Luo
From object tracking to 3D reconstruction, RGB-Depth (RGB-D) camera networks play an increasingly important role in many vision and graphics applications. Practical applications often use sparsely-placed cameras to maximize visibility, while using as few cameras as possible to minimize cost. In general, it is challenging to calibrate sparse camera networks due to the lack of shared scene features across different camera views. In this paper, we propose a novel algorithm that can accurately and rapidly calibrate the geometric relationships across an arbitrary number of RGB-D cameras on a network...
January 15, 2018: Sensors
https://www.readbyqxmd.com/read/29333592/3d-models-of-female-pelvis-structures-reconstructed-and-represented-in-combination-with-anatomical-and-radiological-sections
#2
L Asensio Romero, M Asensio Gómez, A Prats-Galino, J A Juanes Méndez
We present a computer program designed to visualize and interact with three-dimensional models of the main anatomical structures of the female pelvis. They are reconstructed from serial sections of corpse, from the Visible Human project of the Medical Library of the United States and from serial sections of high-resolution magnetic resonance. It is possible to represent these three-dimensional structures in any spatial orientation, together with sectional images of corpse and magnetic resonance imaging, in the three planes of space (axial, coronal and sagittal) that facilitates the anatomical understanding and the identification of the set of visceral structures of this body region...
January 15, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29333590/advantages-and-disadvantages-in-image-processing-with-free-software-in-radiology
#3
Katrin Muradas Mujika, Juan Antonio Juanes Méndez, Andrés Framiñan de Miguel
Currently, there are sophisticated applications that make it possible to visualize medical images and even to manipulate them. These software applications are of great interest, both from a teaching and a radiological perspective. In addition, some of these applications are known as Free Open Source Software because they are free and the source code is freely available, and therefore it can be easily obtained even on personal computers. Two examples of free open source software are Osirix Lite® and 3D Slicer®...
January 15, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29333480/gpu-based-branchless-distance-driven-projection-and-backprojection
#4
Rui Liu, Lin Fu, Bruno De Man, Hengyong Yu
Projection and backprojection operations are essential in a variety of image reconstruction and physical correction algorithms in CT. The distance-driven (DD) projection and backprojection are widely used for their highly sequential memory access pattern and low arithmetic cost. However, a typical DD implementation has an inner loop that adjusts the calculation depending on the relative position between voxel and detector cell boundaries. The irregularity of the branch behavior makes it inefficient to be implemented on massively parallel computing devices such as graphics processing units (GPUs)...
December 2017: IEEE Transactions on Computational Imaging
https://www.readbyqxmd.com/read/29332299/similarity-search-combined-with-docking-and-molecular-dynamics-for-novel-hache-inhibitor-scaffolds
#5
Nadia Melo Borges, Geraldo Rodrigues Sartori, Jean F R Ribeiro, Josmar R Rocha, João B L Martins, Carlos A Montanari, Ricardo Gargano
The main purpose of this study was to address the performance of virtual screening methods based on ligands and the protein structure of acetylcholinesterase (AChE) in order to retrieve novel human AChE (hAChE) inhibitors. In addition, a protocol was developed to identify novel hit compounds and propose new promising AChE inhibitors from the ZINC database with 10 million commercially available compounds. In this sense, 3D similarity searches using rapid overlay of chemical structures and similarity analysis through comparison of electrostatic overlay of docked hits were used to retrieve AChE inhibitors from collected databases...
January 13, 2018: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/29301700/3d-brain-tumor-localization-and-parameter-estimation-using-thermographic-approach-on-gpu
#6
Abdelmajid Bousselham, Omar Bouattane, Mohamed Youssfi, Abdelhadi Raihani
The aim of this paper is to present a GPU parallel algorithm for brain tumor detection to estimate its size and location from surface temperature distribution obtained by thermography. The normal brain tissue is modeled as a rectangular cube including spherical tumor. The temperature distribution is calculated using forward three dimensional Pennes bioheat transfer equation, it's solved using massively parallel Finite Difference Method (FDM) and implemented on Graphics Processing Unit (GPU). Genetic Algorithm (GA) was used to solve the inverse problem and estimate the tumor size and location by minimizing an objective function involving measured temperature on the surface to those obtained by numerical simulation...
January 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29299647/breast-and-tumour-volume-measurements-in-breast-cancer-patients-using-3-d-automated-breast-volume-scanner-images
#7
M Lagendijk, E L Vos, K P Ramlakhan, C Verhoef, A H J Koning, W van Lankeren, L B Koppert
BACKGROUND: The resection volume in relation to the breast volume is known to influence cosmetic outcome following breast-conserving therapy. It was hypothesised that three-dimensional ultrasonography (3-D US) could be used to preoperatively assess breast and tumour volume and show high association with histopathological measurements. METHODS: Breast volume by the 3D-US was compared to the water displacement method (WDM), mastectomy specimen weight, 3-D MRI and three different calculations for breast volume on mammography...
January 3, 2018: World Journal of Surgery
https://www.readbyqxmd.com/read/29273906/3d-super-localization-of-intracellular-organelle-contacts-at-live-single-cell-by-dual-wavelength-synchronized-fluorescence-free-imaging
#8
Suresh Kumar Chakkarapani, Peng Zhang, Seong Ho Kang
A fluorescence-free real-time three-dimensional (3D) super-localization method for the analysis of 3D structure of organelles (e.g., mitochondria-associated endoplasm reticulum [mito-ER] contacts) in live single cells under physiological conditions was developed with dual-wavelength enhanced dark-field microscopy. The method was applied to live single cells under physiological conditions to analyze the complex 3D mito-ER contact region by choosing an optimum nanotag with distinct scattering properties. Combining dual-view with enhanced dark-field microscopy provided concurrent images of different scattering wavelengths of nanotag-labeled mitochondria and ER...
December 22, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29238826/a-re-engineered-software-interface-and-workflow-for-the-open-source-simvascular-cardiovascular-modeling-package
#9
Hongzhi Lan, Adam Updegrove, Nathan Wilson, Gabriel D Maher, Shawn C Shadden, Alison Marsden
Patient-specific simulation plays an important role in cardiovascular disease research, diagnosis, surgical planning and medical device design, as well as education in cardiovascular biomechanics. SimVascular is an open-source software package encompassing an entire cardiovascular modeling and simulation pipeline from image segmentation, 3D solid modeling, and mesh generation, to patient-specific simulation and analysis. SimVascular is widely used for cardiovascular basic science and clinical research as well as education, following increased adoption by users and development of a GATEWAY web portal to facilitate educational access...
December 13, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29235371/hybrid-2d-3d-quantitative-structure-activity-relationship-and-modeling-studies-perspectives-of-pepstatin-a-analogs-as-cathepsin-d-inhibitors
#10
Olayide A Arodola, Mahmoud Es Soliman
AIM: Cathepsin D, one of the attractive targets in the treatment of breast cancer, has been implicated in HIV neuropathogenesis with potential proteolytic effects on chemokines. Methodology/result: Diverse modeling tools were used to reveal the key structural features affecting the inhibitory activities of 78 pepstatin A analogs. Analyses were performed to investigate the stability, rationality and fluctuation of the analogs. Results showed a clear correlation between the experimental and predicted activities of the analogs as well as the variation in their activities relative to structural modifications...
December 13, 2017: Future Medicinal Chemistry
https://www.readbyqxmd.com/read/29224266/-application-of-liver-three-dimensional-visualization-technologies-in-the-treatment-planning-of-hepatic-malignant-tumor
#11
P P Li, Z H Wang, G Huang, Z P Huang, Y Li, J S Ni, H Liu, C H Fang, W P Zhou
Objective: To discuss the application of three dimentional(3D)visualization technologies in treatment plan of hepatic malignant tumor. Methods: The clinical data of 300 patients with liver malignant tumor who received treatment from January 2016 to January 2017 in the Third Department of Hepatic Surgery of Eastern Hepatobiliary Surgery Hospital was retrospectively analyzed in this study, including 221 male and 79 female patients aged from 7 to 76 years with median age of 54 years. The median height was 168 cm (115-183 cm), the median weight was 65 kg (20-105 kg) and the median tumor volume was 142 ml (23-2 493 ml)...
December 1, 2017: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/29211758/rubus-a-compiler-for-seamless-and-extensible-parallelism
#12
Muhammad Adnan, Faisal Aslam, Zubair Nawaz, Syed Mansoor Sarwar
Nowadays, a typical processor may have multiple processing cores on a single chip. Furthermore, a special purpose processing unit called Graphic Processing Unit (GPU), originally designed for 2D/3D games, is now available for general purpose use in computers and mobile devices. However, the traditional programming languages which were designed to work with machines having single core CPUs, cannot utilize the parallelism available on multi-core processors efficiently. Therefore, to exploit the extraordinary processing power of multi-core processors, researchers are working on new tools and techniques to facilitate parallel programming...
2017: PloS One
https://www.readbyqxmd.com/read/29209961/finite-element-analysis-of-the-wrist-in-stroke-patients-the-effects-of-hand-grip
#13
Muhammad Hanif Ramlee, Gan Kok Beng, Nazri Bajuri, Mohammed Rafiq Abdul Kadir
The provision of the most suitable rehabilitation treatment for stroke patient remains an ongoing challenge for clinicians. Fully understanding the pathomechanics of the upper limb will allow doctors to assist patients with physiotherapy treatment that will aid in full arm recovery. A biomechanical study was therefore conducted using the finite element (FE) method. A three-dimensional (3D) model of the human wrist was reconstructed using computed tomography (CT)-scanned images. A stroke model was constructed based on pathological problems, i...
December 5, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29208975/a-numerical-treatment-of-radiative-nanofluid-3d-flow-containing-gyrotactic-microorganism-with-anisotropic-slip-binary-chemical-reaction-and-activation-energy
#14
Dianchen Lu, M Ramzan, Naeem Ullah, Jae Dong Chung, Umer Farooq
A numerical investigation of steady three dimensional nanofluid flow carrying effects of gyrotactic microorganism with anisotropic slip condition along a moving plate near a stagnation point is conducted. Additionally, influences of Arrhenius activation energy, joule heating accompanying binary chemical reaction and viscous dissipation are also taken into account. A system of nonlinear differential equations obtained from boundary layer partial differential equations is found by utilization of apposite transformations...
December 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29186333/fun-a-framework-for-interactive-visualizations-of-large-high-dimensional-datasets-on-the-web
#15
Daniel Probst, Jean-Louis Reymond
Motivation: During the past decade, big data has become a major tool in scientific endeavors. While statistical methods and algorithms are well-suited for analyzing and summarizing enormous amounts of data, the results do not allow for a visual inspection of the entire data. Current scientific software, including R packages and Python libraries such as ggplot2, matplotlib, and plot.ly, do not support interactive visualizations of datasets exceeding 100,000 data points on the web. Other solutions enable the web-based visualization of big data only through data reduction or statistical representations...
November 24, 2017: Bioinformatics
https://www.readbyqxmd.com/read/29169367/image-based-quantitative-analysis-of-tear-film-lipid-layer-thickness-for-meibomian-gland-evaluation
#16
Hyeonha Hwang, Hee-Jae Jeon, Kin Choong Yow, Ho Sik Hwang, EuiHeon Chung
BACKGROUND: Dry eye syndrome is one of the most common ocular diseases, and meibomian gland dysfunction (MGD) is the leading cause of evaporative dry eye syndrome. When the tear film lipid layer becomes thin due to obstructive or hyposecretory meibomian gland dysfunction, the excessive evaporation of the aqueous layer can occur, and this causes evaporative dry eye syndrome. Thus, measuring the lipid layer thickness (LLT) is essential for accurate diagnosis and proper treatment of evaporative dry eye syndrome...
November 23, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29140783/blending-face-details-synthesizing-a-face-using-multiscale-face-models
#17
Seung-Hyun Yoon, John Lewis, Taehyun Rhee
Creating realistic 3D face models is a challenging problem in computer graphics because humans are so sensitive to facial abnormalities. The authors propose a method to synthesize a 3D face model using weighted blending of multiscale details from different face models. Using multiscale continuous displacement maps (CDMs), they achieve full correspondences across multiple scales in the parameter space. Their results demonstrate detail transfer across faces with highly different proportions, such as between humans and nonhuman creatures...
November 2017: IEEE Computer Graphics and Applications
https://www.readbyqxmd.com/read/29131188/laser-display-system-for-multi-depth-screen-projection-scenarios
#18
J Pablo La Torre, Nathan Mayes, Nabeel A Riza
Proposed is a laser projection display system that uses an electronically controlled variable focus lens (ECVFL) to achieve sharp and in-focus image projection over multi-distance three-dimensional (3D) conformal screens. The system also functions as an embedded distance sensor that enables 3D mapping of the multi-level screen platform before the desired laser scanned beam focused/defocused projected spot sizes are matched to the different localized screen distances on the 3D screen. Compared to conventional laser scanning and spatial light modulator (SLM) based projection systems, the proposed design offers in-focus non-distorted projection over a multi-distance screen zone with varying depths...
November 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29127653/development-of-a-3d-workspace-shoulder-assessment-tool-incorporating-electromyography-and-an-inertial-measurement-unit-a-preliminary-study
#19
Navid Aslani, Siamak Noroozi, Philip Davenport, Richard Hartley, Mihai Dupac, Philip Sewell
Traditional shoulder range of movement (ROM) measurement tools suffer from inaccuracy or from long experimental setup times. Recently, it has been demonstrated that relatively low-cost wearable inertial measurement unit (IMU) sensors can overcome many of the limitations of traditional motion tracking systems. The aim of this study is to develop and evaluate a single IMU combined with an electromyography (EMG) sensor to monitor the 3D reachable workspace with simultaneous measurement of deltoid muscle activity across the shoulder ROM...
November 11, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29094238/computational-wear-assessment-of-hard-on-hard-hip-implants-subject-to-physically-demanding-tasks
#20
R Nithyaprakash, S Shankar, M S Uddin
Hip implants subject to gait loading due to occupational activities are potentially prone to failures such as osteolysis and aseptic loosening, causing painful revision surgeries. Highly risky gait activities such as carrying a load, stairs up or down and ladder up or down may cause excessive loading at the hip joint, resulting in generation of wear and related debris. Estimation of wear under the above gait activities is thus crucial to design and develop a new and improved implant component. With this motivation, this paper presents an assessment of wear generation of PCD-on-PCD (poly crystalline diamond) hip implants using finite element (FE) analysis...
November 2, 2017: Medical & Biological Engineering & Computing
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