Search

Your search keyword '"Ivanov, Arkady"' showing total 32 results
Start Over Author "Ivanov, Arkady"
32 results on '"Ivanov, Arkady"'

3. Chronical Subdural Hematoma Segmentation Based on Computed Tomography Images Analysis

Author

Kashevnik, Alexey, Alekseeva, Ekaterina, Haleev, Mikhail, Kitenko, Andrey, Ali, Ammar Yaser, Samochernikh, Konstantin, Kukanov, Konstantin, Ivanov, Arkady, and Petrov, Andrey

Subjects
computer vision medical application chronical subdural hematoma segmentation
Abstract

The aim of the demo is to show our developed system for chronical subdural hematoma segmentation based on analysis of computed tomography images. We used convolutional neural networks to automate the process of subdural hematoma segmentation from DCOM images got from computer tomography device and made a plugin for importing the masks to the OsiriX that one of the most famous DCOM viewer. A training dataset was assembled containing a total of 41 scans consisting of 3306 DCOM images. The presence or absence of subdural hematomas and their area was determined by the radiologist (ground truth). Two architectures are being tested: Unet and FPN (Feature Pyramid Network). For each architecture there are two training options were considered: (1) on separate images, when each image is considered as a separate unit; and (2) pseudo-3D, when images were viewed in blocks and the neural network could make predictions based on predictions for neighboring images. Our best model achieved an average DICE score of 0,7949 on the validation set. We integrated the pretrained model into OsiriX DICOM Viewer as a plugin. The plugin passes images to the model, which returns the segmentation predictions. The plugin converts them to ROI (region of interest) and transfers them to OsiriX, where, if necessary, the radiologist can edit them and get information about hematoma characteristics (such as volume).

Published
2023
Full Text
View/download PDF

5. Natch: using virtual machine introspection and taint analysis for detection attack surface of the software

Author

Dovgalyuk, Pavel Mikhailovich, primary, Klimushenkova, Maria Anatolyevna, additional, Fursova, Natalia Igorevna, additional, Stepanov, Vladislav Mikhailovich, additional, Vasiliev, Ivan Aleksandrovich, additional, Ivanov, Arkady Alekseevich, additional, Ivanov, Alexey Vladimirovich, additional, Bakulin, Maksim Gennadievich, additional, and Egorov, Danila Igorevich, additional

Published
2022
Full Text
View/download PDF

8. Light transmission by a monolayer of particles: comparison of experimental data with calculation as a single-scattering approximation

Author

Dick, Vladimir P., Loiko, Valery A., and Ivanov, Arkady P.

Subjects
Light sources -- Research, Particles -- Optical properties, Light scattering -- Research, Astronomy, Physics
Abstract

The laws of light transmission by particle monolayers are investigated. The results of measurement of coherent transmission for monolayers formed by large non-absorbing particles are presented. The obtained results are compared to the calculation in the single-scattering approximation. Good agreement between experimental and calculated data is shown. Key words: Light scattering, coherent transmission, monolayer, discrete scatterers.

Published
1997

9. Angular structure of radiation scattered by monolayers of particles: experimental study

Author

Dick, Vladimir P., Loiko, Valery A., and Ivanov, Arkady P.

Subjects
Scattering, Radiation -- Analysis, Light scattering -- Analysis, Particles -- Optical properties, Astronomy, Physics
Abstract

An experimental study has been made of the angular structure of radiation scattered by monolayers of large nonabsorbing particles. We have investigated three media exhibiting different light-scattering properties: monodisperse polyvinyl toluene latex particles of 3.75-[[micro]meter] diameter suspended in water, polydisperse rice starch particles with a mean diameter of 6.4 [[micro]meter] suspended in water, and a mixture of ethyl and benzoic alcohols. It is shown that for large particles the structure of scattered radiation can be described in a single-scattering approximation. Analysis of the influence of polydispersity and the relative refractive index of particles on the intensity scattered by the monolayer has been performed. Key words: Light scattering, high concentration of scatterers, monolayer.

Published
1997

32. Extinction of light in dispersive media with high particle concentrations:applicability limits of the interference approximation

Author

Dick, Vladimir P. and Ivanov, Arkady P.

Abstract

We investigated the limits of applicability of the interference approximation (ITA), which is often used to calculate light fields in dispersive media with high particle concentrations. We analyzed the conditions under which the use of the ITA leads to an error in calculation of the dispersive-medium extinction coefficient equal to 10%, 15%, and 25%. The analysis was carried out by comparing the values of calculated in the ITA with the results of the calculation of in a much more exact quasi-crystalline approximation (QCA). The validity of the QCA in estimating the error of the ITA is shown by comparing the values of calculated in the ITA and the QCA with experimental data [J. Opt. Soc. Am. 72 , 1317 (1982)]. Our investigation shows that the ITA can be used only at relatively small values of the particle size parameter x . When the relative refractive index of the particles is n more than 1.8, the applicability of the ITA is limited to the case in which the particle size parameter x less than x_max equivalent to 1.5. A decrease in n leads to an increase in x_max, and for nonabsorbing particles at n less than 1.3, x_max is approximately proportional: 1/(n - 1). An increase in the imaginary part of the relative refractive index of the particles leads to a decrease in x_max . The smaller the n , the greater the dependence of x_max on k. S0740-3232(99)00505-0

Published
1999

Catalog

Books, media, physical & digital resources
See catalog results