scholarly journals Segmentation and 3D Reconstruction of Cerebral Hematoma Based on Deep Learning

CONVERTER ◽  
2021 ◽  
pp. 482-488
Author(s):  
Taipeng Guo, Et al.
Keyword(s):  
Deep Learning ◽  
Cerebral Hemorrhage ◽  
Three Dimensional ◽  
Rapid Onset ◽  
Three Dimensional Model ◽  
Data Set ◽  
Disability Rate ◽  
Short Period ◽  
Dimensional Reconstruction ◽  
Cerebral Hematoma

Cerebral hemorrhage is a common clinical disease. Because of its rapid onset, high mortality and disability rate, in the treatment of cerebral hemorrhage, it is very important to accurately calculate the brain hematoma volume and feedback its location information in a short period of time. This paper proposes a method for precise segmentation and three-dimensional reconstruction of cerebral hematoma area based on deep learning. This method highlights the image information by expanding the CT image and eliminating the skull information, then accurately segments the cerebral hematoma areathrough the neural network model to build a three-dimensional model. We verify the experimental results based on the data set collected by the Affiliated Hospital of Xiangnan University, which proves the effectiveness of this method and its ability to significantly improve the speed incerebral hemorrhage area judgment and grasp information in clinical diagnosis.

A three-dimensional model of fine particle retention during percolation through a fiber mat

TAPPI Journal ◽  
2015 ◽  
Vol 14 (8) ◽  
pp. 546-554
Author(s):  
TERRY BLISS ◽  
MARTIN OSTOJA-STARZEWSKI ◽  
JAIME CASTRO
Keyword(s):  
Experimental Data ◽  
Fine Particles ◽  
Fiber Diameter ◽  
Three Dimensional ◽  
Particle Diameter ◽  
Three Dimensional Model ◽  
Retention Model ◽  
Data Set ◽  
Fiber Mats ◽  
Rayon Fiber

Fine particles are usually retained in fiber mats by sieving. To date, no theory has combined fiber and mat characteristics into a predictive retention model. A multilayer analytical retention model developed during this study predicts retention within a thick fiber mat by modeling retention as particles pass through a series of very thin fiber mats. A suspension of 5-75 μm toner particles was percolated through rayon fiber mats. The model’s prediction approached the experimental data only when the ratio of particle diameter to fiber diameter increased toward 2.0, the upper limit within the rayon fiber mat data set. Retention was also experimentally determined on the macroscale with simulated fiber mats, through which 4-20 mm beads were dropped. The particle diameter was at least 2.2 times the fiber diameter for all of the macroscale experimental data, explaining the much better fit of the data from those experiments to the model’s predictions.

scholarly journals Three-Dimensional Model of the Moon with Semantic Information of Craters Based on Chang’e Data

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 959
Author(s):  
Yunfan Lu ◽  
Yifan Hu ◽  
Jun Xiao ◽  
Lupeng Liu ◽  
Long Zhang ◽  
...  
Keyword(s):  
Reference Frame ◽  
3D Model ◽  
Semantic Information ◽  
Three Dimensional ◽  
Impact Craters ◽  
Detection Methods ◽  
The Moon ◽  
Three Dimensional Model ◽  
Data Set ◽  
The Impact

China’s Chang’e lunar exploration project obtains digital orthophoto image (DOM) and digital elevation model (DEM) data covering the whole Moon, which are critical to lunar research. The DOM data have three resolutions (i.e., 7, 20 and 50 m), while the DEM has two resolutions (i.e., 20 and 50 m). Analysis and research on these image data effectively help humans to understand the Moon. In addition, impact craters are considered the most basic feature of the Moon’s surface. Statistics regarding the size and distribution of impact craters are essential for lunar geology. In existing works, however, the lunar surface has been reconstructed less accurately, and there is insufficient semantic information regarding the craters. In order to build a three-dimensional (3D) model of the Moon with crater information using Chang‘e data in the Chang‘e reference frame, we propose a four-step framework. First, software is implemented to annotate the lunar impact craters from Chang’e data by complying with our existing study on an auxiliary annotation method and open-source software LabelMe. Second, auxiliary annotation software is adopted to annotate six segments in the Chang’e data for an overall 25,250 impact crater targets. The existing but inaccurate craters are combined with our labeled data to generate a larger dataset of craters. This data set is analyzed and compared with the common detection data. Third, deep learning detection methods are employed to detect impact craters. To address the problem attributed to the resolution of Chang’e data being too high, a quadtree decomposition is conducted. Lastly, a geographic information system is used to map the DEM data to 3D space and annotate the semantic information of the impact craters. In brief, a 3D model of the Moon with crater information is implemented based on Chang’e data in the Chang‘e reference frame, which is of high significance.

scholarly journals Serial Section-Based Three-Dimensional Reconstruction of Anaxagorea (Annonaceae) Carpel Vasculature and Implications for the Morphological Relationship between the Carpel and the Ovule

Plants ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 2221
Author(s):  
Ya Li ◽  
Wei Du ◽  
Ye Chen ◽  
Shuai Wang ◽  
Xiao-Fan Wang
Keyword(s):  
Three Dimensional ◽  
Three Dimensional Model ◽  
Floral Organogenesis ◽  
Dimensional Reconstruction ◽  
Long Time ◽  
The Relationship ◽  
Morphological Relationship ◽  
Anatomical Evidence ◽  
Bearing Part ◽  
Complex Organ

Elucidating the origin of flowers has been a challenge in botany for a long time. One of the central questions surrounding the origin of flowers is how to interpret the carpel, especially the relationship between the phyllome part (carpel wall) and the ovule. Recently, consensus favors the carpel originating from the fusion of an ovule-bearing part and the phyllome part that subtends it. Considering the carpel is a complex organ, the accurate presentation of the anatomical structure of the carpel is necessary for resolving this question. Anaxagorea is the most basal genus in a primitive angiosperm family, Annonaceae. The conspicuous stipe at the base of each carpel makes it an ideal material for exploring the histological relationships among the receptacle, the carpel, and the ovule. In the present study, floral organogenesis and vasculature were delineated in Anaxagorea luzonensis and Anaxagorea javanica, and a three-dimensional model of the carpel vasculature was reconstructed based on serial sections. The results show that in Anaxagorea, the vasculature in the carpel branches in the form of shoots. The radiosymmetrical vasculature pattern is repeatedly presented in the receptacle, the carpel, and the funiculus of the ovule. This provides anatomical evidence of the composite origin of the carpel.

New Three-Dimensional Algebraic Reconstruction Techniques (Art)

1971 ◽  
Vol 29 ◽  
pp. 82-83 ◽  
Author(s):  
Richard Gordon ◽  
Robert Bender
Keyword(s):  
Three Dimensional ◽  
Fourier Method ◽  
List Type ◽  
Type Number ◽  
Data Set ◽  
3 Dimensional ◽  
Dimensional Reconstruction ◽  
Algebraic Reconstruction Techniques ◽  
Electron Microscope Data ◽  
Algebraic Reconstruction

Algebraic reconstruction techniques (ART) for 3-dimensional reconstruction from electron microscope data have been developed and implemented in this laboratory. These methods are an alternitive to the Fourier method of de Rosier and Klug and have several advantages over it, such as:relatively few views are required (about 6-12)limited angular ranges give useful reconstructions (+/-30°)no presumption of symmetry is necessary for facile implementingcomputation is fasterthe computation is stable in the presence of noiseThe dimensionality of the problem may be reduced from three to two by tilts about a single axis, so that planes perpendicular to the axis of tilt are independent of each other. This is not absolutely necessary, but is by far the most tractable mode computationally. A typical input data set, then, consists of m≥6 photos of the same region of the specimen at several known angles of tilt about the same axis. In general the direction of the tilt axis is not known.

Three-Dimensional Reconstruction of Single Input Image Based on Point Cloud

2021 ◽  
Vol 87 (7) ◽  
pp. 479-484
Author(s):  
Yu Hou ◽  
Ruifeng Zhai ◽  
Xueyan Li ◽  
Junfeng Song ◽  
Xuehan Ma ◽  
...  
Keyword(s):  
Point Cloud ◽  
Large Scale ◽  
Three Dimensional ◽  
Data Sets ◽  
Point Cloud Data ◽  
Three Dimensional Reconstruction ◽  
Data Set ◽  
Cloud Data ◽  
Dimensional Reconstruction ◽  
Institute Of Technology

Three-dimensional reconstruction from a single image has excellent future prospects. The use of neural networks for three-dimensional reconstruction has achieved remarkable results. Most of the current point-cloud-based three-dimensional reconstruction networks are trained using nonreal data sets and do not have good generalizability. Based on the Karlsruhe Institute of Technology and Toyota Technological Institute at Chicago ()data set of large-scale scenes, this article proposes a method for processing real data sets. The data set produced in this work can better train our network model and realize point cloud reconstruction based on a single picture of the real world. Finally, the constructed point cloud data correspond well to the corresponding three-dimensional shapes, and to a certain extent, the disadvantage of the uneven distribution of the point cloud data obtained by light detection and ranging scanning is overcome using the proposed method.

scholarly journals Modeling and Validation of Heliostat Deformation due to Static Loading

2011 ◽  
Author(s):  
Adam C. Moya ◽  
Clifford K. Ho
Keyword(s):  
Finite Element ◽  
Structural Stability ◽  
Three Dimensional ◽  
Test Facility ◽  
Optical Performance ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Data Set ◽  
Static Test ◽  
The Impact

Accurate and reliable models are necessary to predict the performance and efficiencies of concentrating solar power plant components and systems such as heliostats and central receiver systems. Heliostat performance is impacted from effects such as wind and gravity, and understanding the impact of these loads on the optical performance can yield heliostat designs that are potentially cheaper, while maintaining required structural stability. Finite element models of heliostats at the National Solar Thermal Test Facility (NSTTF) at Sandia National Laboratories in Albuquerque, NM, were developed to simulate displacements under different loading scenarios. Solidworks was used to develop the three-dimensional model of the NSTTF heliostat, and Solidworks Simulation was used to perform the finite element analysis with simulated loads along different points of the heliostat. Static displacement tests were performed on the NSTTF heliostat in order to validate these FEA models. The static test results provide us with a data set in which to properly calibrate the FEA model to better represent the NSTTF heliostat for future simulations of optical performance with impacts of wind and gravity sag. In addition to a single model validation, this real world test provides a method to validate and understand the structural stability of a heliostat under static loads.

Three-dimensional reconstruction of the chondriome of the unicellular red alga Rhodella reticulata

1986 ◽  
Vol 84 (1) ◽  
pp. 213-219
Author(s):  
S. Broadwater ◽  
J. Scott
Keyword(s):  
Three Dimensional ◽  
Red Alga ◽  
Main Body ◽  
Cell Periphery ◽  
Three Dimensional Model ◽  
Balsa Wood ◽  
Transmission Electron ◽  
Dimensional Reconstruction ◽  
Cursory Examination ◽  
Rhodella Reticulata

Three cells of the unicellular red alga Rhodella reticulata were serially sectioned and photographed in a transmission electron microscope in order to analyse the organization of the mitochondrial system, or chondriome, which, on the basis of cursory examination, appeared to consist of an interconnected network of one to a few organelles. The chondriome of all three cells was traced and superimposed on acetate paper and a three-dimensional model using balsa wood was constructed of one cell. The chondriome was found to consist primarily of one large, anastomosing mitochondrion located principally at the cell periphery. In addition, it appears that some cells can contain a few small mitochondria that are not connected to the main body of the chondriome. This is the first study to reveal the three-dimensional nature of the chondriome in a red alga.

Structure refinement using precession electron diffraction tomography and dynamical diffraction: theory and implementation

2015 ◽  
Vol 71 (2) ◽  
pp. 235-244 ◽  
Author(s):  
Lukáš Palatinus ◽  
Václav Petříček ◽  
Cinthia Antunes Corrêa
Keyword(s):  
Electron Diffraction ◽  
Rotation Axis ◽  
Structure Refinement ◽  
Three Dimensional ◽  
Electron Diffraction Data ◽  
Diffraction Tomography ◽  
Three Dimensional Model ◽  
Data Set ◽  
Dynamical Diffraction ◽  
Precession Electron Diffraction

Accurate structure refinement from electron-diffraction data is not possible without taking the dynamical-diffraction effects into account. A complete three-dimensional model of the structure can be obtained only from a sufficiently complete three-dimensional data set. In this work a method is presented for crystal structure refinement from the data obtained by electron diffraction tomography, possibly combined with precession electron diffraction. The principle of the method is identical to that used in X-ray crystallography: data are collected in a series of small tilt steps around a rotation axis, then intensities are integrated and the structure is optimized by least-squares refinement against the integrated intensities. In the dynamical theory of diffraction, the reflection intensities exhibit a complicated relationship to the orientation and thickness of the crystal as well as to structure factors of other reflections. This complication requires the introduction of several special parameters in the procedure. The method was implemented in the freely available crystallographic computing systemJana2006.

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