Creation of a wire-frame model for three-dimensional registration of raster image regions of interest

1990 ◽  
Author(s):  
Robert L. Galloway, Jr. ◽  
Charles A. Edwards II ◽  
Gerald L. Haden ◽  
Robert J. Maciunas
Keyword(s):  
Three Dimensional ◽  
Regions Of Interest ◽  
Frame Model ◽  
Raster Image ◽  
Wire Frame

scholarly journals A three-dimensional thalamocortical dataset for characterizing brain heterogeneity

2020 ◽  
Author(s):  
Judy A. Prasad ◽  
Aishwarya H. Balwani ◽  
Erik C. Johnson ◽  
Joseph D. Miano ◽  
Vandana Sampathkumar ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Brain Regions ◽  
Regions Of Interest ◽  
Subcortical Structures ◽  
Neural Structure ◽  
Brain Areas ◽  
X Ray ◽  
Anatomical Imaging ◽  
Brain Pathways ◽  
Critical Aspects

AbstractNeural cytoarchitecture is heterogeneous, varying both across and within brain regions. The consistent identification of regions of interest is one of the most critical aspects in examining neurocircuitry, as these structures serve as the vital landmarks with which to map brain pathways. Access to continuous, three-dimensional volumes that span multiple brain areas not only provides richer context for identifying such landmarks, but also enables a deeper probing of the microstructures within. Here, we describe a three-dimensional X-ray microtomography imaging dataset of a well-known and validated thalamocortical sample, encompassing a range of cortical and subcortical structures. In doing so, we provide the field with access to a micron-scale anatomical imaging dataset ideal for studying heterogeneity of neural structure.

scholarly journals A computationally efficient approach to segmentation of the aorta and coronary arteries using deep learning

2021 ◽  
Author(s):  
Wing Keung Cheung ◽  
Robert Bell ◽  
Arjun Nair ◽  
Leon Menezies ◽  
Riyaz Patel ◽  
...  
Keyword(s):  
Deep Learning ◽  
Coronary Arteries ◽  
Automatic Segmentation ◽  
Three Dimensional ◽  
Regions Of Interest ◽  
Dice Similarity Coefficient ◽  
Processing Unit ◽  
Two Dimensional ◽  
Computed Tomography Images ◽  
Graphical Processing

AbstractA fully automatic two-dimensional Unet model is proposed to segment aorta and coronary arteries in computed tomography images. Two models are trained to segment two regions of interest, (1) the aorta and the coronary arteries or (2) the coronary arteries alone. Our method achieves 91.20% and 88.80% dice similarity coefficient accuracy on regions of interest 1 and 2 respectively. Compared with a semi-automatic segmentation method, our model performs better when segmenting the coronary arteries alone. The performance of the proposed method is comparable to existing published two-dimensional or three-dimensional deep learning models. Furthermore, the algorithmic and graphical processing unit memory efficiencies are maintained such that the model can be deployed within hospital computer networks where graphical processing units are typically not available.

Generation of Surface Models of 3D Objects From Their Wire-Frame Models

1992 ◽  
Author(s):  
S. Gupta ◽  
A. Shirkhodaie ◽  
A. H. Soni
Keyword(s):  
Common Vertex ◽  
Surface Model ◽  
Edge Information ◽  
Frame Model ◽  
3D Objects ◽  
Wire Frame ◽  
Surface Models ◽  
Plane Passing ◽  
Generate Surface ◽  
The Wire

Abstract This paper presents an algorithm to generate surface models of 3D objects from their wire-frame models. The algorithm firstly, obtains information about edges of the object from the wire-frame model of the object and uses this edge information to generate the pairs. A pair of an object is a combination of two non-collinear edges which have a common vertex. The algorithm then determines the unique plane passing through each pair and groups the coplanar pairs together. Then it sorts each of the groups of coplanar pairs to form one or more loops of edges. Finally for each group of coplanar pairs, all the loops are combined, using a few rules, to form faces of the object. Hence a surface model of the object is generated.

THE INFLUENCE OF OXYGEN-CONTAINING FUNCTIONAL GROUPS ON THE SURFACE BEHAVIOR AND ROUGHNESS CHARACTERISTICS OF GRAPHENE OXIDE

NANO ◽  
2013 ◽  
Vol 08 (04) ◽  
pp. 1350045 ◽  
Author(s):  
AHMAD ALLAHBAKHSH ◽  
FARHAD SHARIF ◽  
SAEEDEH MAZINANI
Keyword(s):  
Graphene Oxide ◽  
Functional Groups ◽  
Three Dimensional ◽  
Diffraction Method ◽  
Force Microscopy ◽  
Atomic Force ◽  
Wire Frame ◽  
Stick Model ◽  
The Individual ◽  
Graphene Oxide Sheets

The effects of oxygen-containing functional groups on the surface roughness of graphene oxide are thoroughly studied using three-dimensional atomic force microscopy images, ball-and-stick model and wire-frame view results. Moreover, X-ray diffraction method and Fourier transform infrared spectroscopy are employed for characterizing the structural and chemical behavior of graphene oxide, respectively. Graphene oxide sheets show a clear concavity on one side when the aggregation of functional groups increased on the other side. This behavior could be the main reason for the surface fluctuation of graphene oxide sheets that is observed in microscopic images. In addition, the individual graphene oxide sheet presents greater values of mean roughness compared to multilayered sheets.

Effects of Presurgical Orthopedic Treatment in Infants with Complete Bilateral Cleft Lip and Palate

1998 ◽  
Vol 35 (3) ◽  
pp. 227-232 ◽  
Author(s):  
Katsuaki Mishima ◽  
Toshio Sugahara ◽  
Yoshihide Mori ◽  
Katsuhiro Minami ◽  
Masayoshi Sakuda
Keyword(s):  
Discriminant Analysis ◽  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Three Dimensional ◽  
Predictor Variables ◽  
Measuring Apparatus ◽  
Orthopedic Treatment ◽  
Wire Frame ◽  
Bilateral Cleft Lip ◽  
Posterior Shift

Objective To align the protruding premaxilla in infants with bilateral cleft lip and palate (BCLP), an intraoral appliance (i.e., Hotz plate) and an extraoral appliance consisting of a band covering the head and elastics are used as a presurgical orthopedic treatment in our clinic. The aim of this study was to analyze the configuration and position of the premaxilla and the vomer in infants with BCLP and to investigate the factors generating deviation and bending of the vomer and twisting of the premaxilla. Patients Palatal casts were obtained serially from 10 infants with complete BCLP from 1 to 3 months of age. Measurements These casts were automatically measured using a highly accurate contact-type measuring apparatus. After three-dimensional wire frame models generated from the serial casts were automatically superimposed, the magnitude and direction of the shift were calculated. A discriminant analysis was used for investigation of predictor variables generating the twisting or bending vomer. Results and Conclusions The vomer was found to be bent in two infants and the premaxilla was twisted in three infants. In the infants whose vomers were bent, the magnitude of the posterior shift of the premaxilla was greater than that of the inferior shift. A discriminant analysis indicated that at 1 month of age, a greater inclination and a smaller deviation of the vomer and a longer distance between the cleft edges of the lateral segments had a tendency to be associated with bending of the vomer or twisting of the premaxilla.

Exponential subtraction in 3D ultrashort echo time imaging to visualize short T2 tissues in tibia

2019 ◽  
Vol 61 (6) ◽  
pp. 760-767
Author(s):  
Sha Li ◽  
Xinrui Huang ◽  
Guozhen Li ◽  
Yibao Zhang ◽  
Zhaotong Li ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Three Dimensional ◽  
Regions Of Interest ◽  
Observer Agreement ◽  
Exponential Factor ◽  
Ultrashort Echo Time ◽  
Short T2 ◽  
Exponential Factors ◽  
Echo Time ◽  
Dual Echo

Background Short T2 tissues can be directly visualized by dual-echo ultrashort echo time imaging with weighted subtraction. As a type of post-processing method, exponential subtraction of ultrashort echo time images with an optimal exponential factor is expected to provide improved positive short T2 contrast. Purpose To test the feasibility and effectiveness of exponential subtraction in three-dimensional ultrashort echo time imaging and to determine the optimal exponential factor. Material and Methods A dual-echo three-dimensional ultrashort echo time sequence was implemented on a 3-T MRI system. Exponential subtraction was performed on dual three-dimensional ultrashort echo time images of the tibia of seven healthy volunteers with exponential factors in the range of 1.00–3.00 in increments of 0.01. The regions of interest, including cortical bone, marrow, and muscle, were depicted on subtracted images of different exponential factors. Contrast-to-noise ratio values were calculated from these regions of interest and then used to assess the optimal exponential factor. To determine intra-observer agreement regarding region of interest selection, paired intra-observer measurements of regions of interest in all direct subtraction images were conducted with a one-week interval and the paired measurements were assessed using Bland–Altman analysis and paired-samples t-test. Results Cortical bone can be better visualized by using exponential subtraction in three-dimensional ultrashort echo time imaging; the suggested optimal exponential factor is 1.99–2.03 in the tibia. Paired measurements showed excellent intra-observer agreement. Conclusion It is feasible to visualize cortical bone of the tibia using exponential subtraction in three-dimensional ultrashort echo time imaging. Compared with weighted subtraction images, exponential subtraction images with an optimal exponential factor provide enhanced visualization of short T2 tissues.

Design and Model Analysis of City Bus Body Frame Based on ANSYS

2011 ◽  
Vol 219-220 ◽  
pp. 1389-1392
Author(s):  
Xiao Zhong Ren ◽  
Shao Jie Du ◽  
Xue Sheng Pei
Keyword(s):  
Surface Profile ◽  
3D Models ◽  
Model Analysis ◽  
Body Frame ◽  
3D Design ◽  
Frame Model ◽  
City Bus ◽  
Wire Frame ◽  
Finite Element Technology ◽  
Bus Body

Applying the 3D design and finite element technology to the design of city bus body, the model analysis of bus body frame was carried out. On the basis of general modeling of bus body, the locus of bus body frame was constructed in light of the inner surface profile of body cover panel. The 3D models of both bus body frame and floor frame were constructed under Pro/E, and the virtual assembly of them was completed. By leading the wire frame model of bus body frame in ANSYS software, its FEA wire frame model was obtained. The natural frequency and vibration mode of bus body frame can be known by means of model analysis. It lays the foundation for the FEA of whole bus body frame.

A three dimensional wire frame graphics system

1987 ◽  
Vol 17 (4) ◽  
pp. 1-6
Author(s):  
Uday G. Gujar
Keyword(s):  
Three Dimensional ◽  
Wire Frame
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