scholarly journals Computed Tomographic Image Processing and Reconstruction in the Diagnosis of Rare Osteochondroma

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Ting Zhao ◽  
Hongyan Zhao
Keyword(s):  
Image Processing ◽  
3D Reconstruction ◽  
Three Dimensional ◽  
Imaging Features ◽  
Computed Tomographic ◽  
Imaging Characteristics ◽  
Rare Site ◽  
Lesion Growth ◽  
Processing Techniques

Objective. We applied computed tomography (CT) to explore the imaging manifestations of rare parts of osteochondroma. Based on the medical images, deblurring using a convolutional neural network (CNN), and three-dimensional (3D) reconstruction of the images is performed in order to improve the image diagnosis. Methods. Twelve cases of osteochondroma in rare locations confirmed by surgical pathology or clinical long-term dynamic observation were retrospectively analyzed using medical imaging and image reconstruction. There are 7 males and 5 females, with an average age of 43 years. CT examinations were performed in all cases. Image deblurring via the GAN model is performed followed by the 3D reconstruction of the higher quality images is implemented. A retrospective study was performed on the imaging manifestations of the above cases; the imaging characteristics were summarized. Results. The imaging features are the following lesions, including 4 cases of the proximal radius, 4 cases of the scapula, 2 cases of the pelvis, and 2 cases of the proximal ribs. The cartilage caps, cortex, and sternum were typical structures of the bone surface of the studied cases. In the continuous imaging features, calcification was visible in some cases, and no significant enhancement was seen in enhanced scans; there was no obvious direction of lesion growth. The image processing techniques that we performed are useful in enhancing the quality of the medical diagnosis. Conclusions. Rare site osteochondroma has certain imaging features. In most cases, we can accurately diagnose rare site osteochondroma through these features via the image processing methods that are proposed in this paper.

Three-Dimensional Structure of Rotavirus-Fab Complex

1990 ◽  
Vol 48 (1) ◽  
pp. 238-239
Author(s):  
B.V.V. Prasad ◽  
E. Marietta ◽  
J.W. Burns ◽  
M.K. Estes ◽  
W. Chiu
Keyword(s):  
Image Processing ◽  
Smooth Surface ◽  
Three Dimensional ◽  
Outer Shell ◽  
Dimensional Structure ◽  
Structural Studies ◽  
Cell Penetration ◽  
Electron Cryomicroscopy ◽  
Image Processing Techniques ◽  
Processing Techniques

Rotaviruses are spherical, double-shelled particles. They have been identified as a major cause of infantile gastroenteritis worldwide. In our earlier studies we determined the three-dimensional structures of double-and single-shelled simian rotavirus embedded in vitreous ice using electron cryomicroscopy and image processing techniques to a resolution of 40Å. A distinctive feature of the rotavirus structure is the presence of 132 large channels spanning across both the shells at all 5- and 6-coordinated positions of a T=13ℓ icosahedral lattice. The outer shell has 60 spikes emanating from its relatively smooth surface. The inner shell, in contrast, exhibits a bristly surface made of 260 morphological units at all local and strict 3-fold axes (Fig.l).The outer shell of rotavirus is made up of two proteins, VP4 and VP7. VP7, a glycoprotein and a neutralization antigen, is the major component. VP4 has been implicated in several important functions such as cell penetration, hemagglutination, neutralization and virulence. From our earlier studies we had proposed that the spikes correspond to VP4 and the rest of the surface is composed of VP7. Our recent structural studies, using the same techniques, with monoclonal antibodies specific to VP4 have established that surface spikes are made up of VP4.

scholarly journals ORIENTATION VS. ORIENTATION: IMAGE PROCESSING FOR STUDIES OF DENTAL MORPHOLOGY

2021 ◽  
Vol XLIII-B2-2021 ◽  
pp. 723-728
Author(s):  
A. V. Gaboutchian ◽  
V. A. Knyaz ◽  
S. V. Vasilyev ◽  
D. V. Korost ◽  
A. A. Kudaev
Keyword(s):  
Image Processing ◽  
3D Reconstruction ◽  
Archaeological Site ◽  
Current Paper ◽  
Dental Morphology ◽  
Micro Computed Tomography ◽  
Computed Tomographic ◽  
Central Russia ◽  
Wide Range ◽  
Dental Measurements

Abstract. Many odontological studies held through application of traditional and modern techniques, especially when related to measurements and morphology, very much depend on methodological aspects referred to orientation of teeth. And this is particularly relevant to new imaging and 3d reconstruction implemented in dental research and practice in a wide range of disciplines from anthropology to dentistry. The current paper deals with studies of palaeoanthropological findings dating back to the Upper Palaeolithic period in Central Russia – well-known archaeological site of Sunghir. Micro-computed tomography has been used for digital reconstructions of teeth – molars and premolars representing well-preserved dental morphology of an adolescent individual. This is due to new opportunities introduced by 3d reconstruction techniques in general and high-resolution x-ray imaging in particular that this study has become relevant. Thus digital techniques do not only provide for operating convenience but, which is even more important, allow application of image processing algorithms. In the suggested methodology these are automated, based on morphological interpretations and serve for orientation of studied teeth for further measurements. At the same time micro-computed tomographic imaging allows accurate reconstruction of other morphologically important structures which are used for an alternative orientation algorithm. Comparisons of dental measurements’ results obtained through automated digital odontometry (aDo) after both orientations applied are presented in the current paper.

scholarly journals A Flexible Autonomous Robotic Observatory Infrastructure for Bentho-Pelagic Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1614 ◽  
Author(s):  
Jacopo Aguzzi ◽  
Jan Albiez ◽  
Sascha Flögel ◽  
Olav Rune Godø ◽  
Endre Grimsbø ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Oil And Gas ◽  
Cold Water ◽  
Three Dimensional ◽  
Ecosystem Monitoring ◽  
Habitat Features ◽  
Technological Developments ◽  
Processing Techniques ◽  
Traditional Approaches

This paper presents the technological developments and the policy contexts for the project “Autonomous Robotic Sea-Floor Infrastructure for Bentho-Pelagic Monitoring” (ARIM). The development is based on the national experience with robotic component technologies that are combined and merged into a new product for autonomous and integrated ecological deep-sea monitoring. Traditional monitoring is often vessel-based and thus resource demanding. It is economically unviable to fulfill the current policy for ecosystem monitoring with traditional approaches. Thus, this project developed platforms for bentho-pelagic monitoring using an arrangement of crawler and stationary platforms at the Lofoten-Vesterålen (LoVe) observatory network (Norway). Visual and acoustic imaging along with standard oceanographic sensors have been combined to support advanced and continuous spatial-temporal monitoring near cold water coral mounds. Just as important is the automatic processing techniques under development that have been implemented to allow species (or categories of species) quantification (i.e., tracking and classification). At the same time, real-time outboard processed three-dimensional (3D) laser scanning has been implemented to increase mission autonomy capability, delivering quantifiable information on habitat features (i.e., for seascape approaches). The first version of platform autonomy has already been tested under controlled conditions with a tethered crawler exploring the vicinity of a cabled stationary instrumented garage. Our vision is that elimination of the tether in combination with inductive battery recharge trough fuel cell technology will facilitate self-sustained long-term autonomous operations over large areas, serving not only the needs of science, but also sub-sea industries like subsea oil and gas, and mining.

Asymptomatic versus Symptomatic Herniated Thoracic Discs: Their Frequency and Characteristics as Detected by Computed Tomography after Myelography

Neurosurgery ◽  
1991 ◽  
Vol 28 (2) ◽  
pp. 180-186 ◽  
Author(s):  
Eric E. Awwad ◽  
David S. Martin ◽  
Kenneth R. Smith ◽  
Bradley K. Baker
Keyword(s):  
Computed Tomography ◽  
Prophylactic Surgery ◽  
Herniated Disc ◽  
Imaging Features ◽  
Computed Tomographic ◽  
Imaging Characteristics ◽  
Computed Tomographic Scan ◽  
Thoracic Cord ◽  
Herniated Discs

Abstract We retrospectively reviewed the myelograms of 433 patients and identified those who had no symptoms or signs referable to the thoracic cord, roots, or nerves. By post-myelography computed tomographic scan criteria, our frequency of asymptomatic thoracic herniated dises (ATHDs) was calculated. Post-myelography computed tomographic scans of 68 ATHDs were analyzed. Their imaging characteristics were compared with our own series of 5 symptomatic thoracic herniated discs and symptomatic thoracic herniated discs in the literature. We were unable to identify any imaging features that could reliably classify a disc as an ATHD or a symptomatic thoracic herniated disc. Our results call into question the propriety of prophylactic surgery for ATHDs, even when the lesions are radiographically impressive.

Analysis of Motions of a Semisubmersible in Sea Waves

1982 ◽  
Vol 104 (1) ◽  
pp. 29-38
Author(s):  
F. Z. Sun
Keyword(s):  
Transfer Functions ◽  
Three Dimensional ◽  
Theoretical Data ◽  
Statistical Characteristics ◽  
Sea Waves ◽  
Regular Waves ◽  
Short Term ◽  
Equivalent Wave ◽  
Processing Techniques

The forces acting on a three-dimensional cylinder with arbitrary symmetrical cross section are derived taking into account viscous effect and applying linear-processing techniques. Then general expressions for the hydrodynamic forces, motion equation and its solution for a semisubmersible platform in regular waves are obtained. Based on linear theory of statistical analysis, it is proposed to employ the concept of “equivalent wave height” for the calculation of transfer functions with which both the short-term and long-term distribution and statistical characteristics of the motion of a semisubmersible may be estimated. A computer program has been developed. Comparison between model experimental and theoretical data has shown satisfactory agreement.

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