Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"Oleg G. AVRUNIN"

Using a priori data for segmentation anatomical structures of the brain DOI:10.15199/48.2017.05.20

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The paper presents a method for providing a segmentation of the anatomical structures of the brain at the image. The proposed method of segmentation makes the analysis of tomographic slices based on the stage of the provisional classification. Furthermore, for the segmentation of brain CT slices, it is proposed to use as the information about the position and the shape of structures and the X-ray density. Streszczenie. Artykuł prezentuje metodę segmentacji struktur anatomicznych mózgu. Przedstawiona metoda segmentacji wykorzystuje etap wstępnej anlizy przekrojów tomograficznych. Dodatkowo informacji uzyskana na etapie segmentacji obrazów CT mózgu, może być wykorzystana do określania kształtu o położenia struktur mózgowych, jak również określenia wiązki promieniowania X podczas zabiegu operacyjnego (Wykorzystanie danych a priori do segmentacji anatomicznych struktur mózgu). Keywords: brain, computed tomography, image segmentation, a priori information. Słowa kluczowe: mózg, tomografia komputerowa, segmentacja obrazu, informacja a priori Introduction Currently, stereotactic brain surgery relies heavily on computer planning of surgical accesses. These systems, using introscopic research data (such as CT, MRI, etc.) allow us to identify the most optimal (in terms of the least trauma) path of a surgical intervention. Development of computer planning systems is a challenge that includes both hardware and software levels. One of the fundamental parts of a planning system is space of operation on which the calculation is made. This space is the volume of brain, elementary item which contains the value of invasiveness index corresponding to a specific anatomical structure. Building of such a volume according the introscopic data manually is a tedious task. It is therefore necessary to carry out the automatic segmentation of brain CT slices based on a priori information about the disposition of anatomical structures. The solution to this pr[...]

Acoustic excitation of electric field in water solution NaCl DOI:10.15199/48.2019.04.28

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The physical phenomena, research methods and devices are widely used in modern biological technologies [1,2,3]. One of the physical phenomena poorly studied in these technologies is action of a direct magnetic field on movement of particles of the electroconducting medium. Forward moving of the charged particles with some speed (v) in a direct magnetic field (DMF) with induction B causes occurrence of electric field E in space. Vector E is directed under some corner to directions of vectors of speed and a magnetic field [1]. This physical phenomenon has been opened in 19 century great English experimenter Michael Faradey, but has started to be applied only in the middle of 20 centuries. It has been used by Van-Alfen for an explanation of electromagnetic properties of an ionosphere of the Earth [4], for creation powerful magnetohydrodynamic (MHD) generators of electric energy [1] and for creation of pumps for swapping of liquid metals [5]. In the given work we study possibility of application of it the phenomenon for the decision of problems of biological technologies. Magnetohydrodynamic (MHD) generato12rs of electric energy are constructed, in particular, on the basis of this law. The value and direction of a vector of intensity of direct electric field in this case is defined by the formula of vector product: (1) E  v  B The scalar product of the velocity and induction of the magnetic field determines the magnitude of the electric field strength if the velocity and induction vectors are mutually perpendicular: (2) E  v  B Features of moving of the charged particles with a variable on a value and a direction of the speed are studied in the given work. In particular, such collective moving can make ions of electroconducting liquid under the influence of a wave of ultrasonic radiation (USR). Biological tissue (BT) is basically an electroconducting liquid. Periodic highfrequency compression [...]

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