Artem AvakyanProdis.NDT · R&D
Artem Avakyan
Master of Biomedical Engineering
About
11
Publications
480
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6
Citations
Introduction
As a researcher, I am currently affiliated with Prodis.NDT (2D planar imaging and 3D microTomography systems) and NIITFA (cone-beam CT development for medical radiotherapy system).
My areas of interest include: xray tube effective focal spot properties and associated image degradation; xray source real performance properties measurement; digital flat panel detector performance properties; cone-beam CT artifacts reduction (geometry calibration, scattered radiation, beam hardening, etc.)
Additional affiliations
October 2019 - present
ProdisNDT
Position
- Researcher
Description
- I am in charge of applied scientific and technical studies and their results implementation into our commercially available solutions for x-ray nondestructive testing (NDT). We have worked out a comprehensive approach to examination of real performance characteristics of microfocus X-ray sources in wide range of control parameters. Approach was tested on monoblocks from various manufacturers, including Spellman, EltechMed and Hamamatsu. Also, I perform CBCT reconstructions in VGSTUDIO MAX.
September 2017 - present
NIITFA
Position
- Engineer
Description
- I am involved in the development of a cone-beam computed tomography (CBCT) module as a part of image-guided radiotherapy (IGRT) system. My field of responsibility is a search for both hardware and software solutions to achieve best possible images quality. I develop, investigate and help programmers to implement into the final product methods and algorithms for: x-ray projections acquisition; system calibrations; image processing during tomographic reconstruction.
Education
September 2011 - June 2019
Publications
Publications (11)
В результате проведенной работы была разработана и изготовлена система фильтрации для микротомографии нефтегазового керна диаметром 38 мм на томографе с максимальным напряжением рентгеновского источника 80 кВ, основанная на компенсирующем фильтре.
Компенсирующий фильтр позволил достигнуть высокого контраста на томографических срезах, равномерного п...
The purpose of this work is to demonstrate the features of Russian and imported microfocus X-ray devices that are not explicitly specified in the manufacturer's documentation, but have a significant impact on the characteristics of the imaging system. The paper presents the following experimental observations: the focal spot (FS) size dependence on...
The paper presents measurement methods of focal spot (FS) characteristics for X-ray sources with a nominal FS size of less than 100 micrometers. The work is based on applied problems and is aimed for developers of X-ray imaging systems, for whom it is important to control the real performance of FS in a wide range of source operating parameters. An...
Работа посвящена исследованию характеристик фокусных пятен (ФП) с номинальным размером менее 100 мкм. Работа имеет прикладной характер и ориентирована на разработчиков систем рентгеновской визуализации, для которых важен контроль, в том числе динамический, реальных эксплуатационных характеристик ФП в широком рабочем диапазоне параметров источника....
Цель данной работы – продемонстрировать особенности российских и импортных микрофокусных рентгеновских аппаратов, не прописанные явно в документации
производителя, но оказывающие существенное влияние на характеристики системы визуализации. В работе представлены следующие экспериментальные наблюдения: зависимость размера фокусного пятна (ФП) от напр...
The purpose of this work is to investigate the factors determining the magnitude and nature of the lag effect (residual signal) in the Varian PaxScan 4343CB flatpanel detector. Depending on the detector mode, typical value of residual signal is 12% after single exposed frame, increasing up to 3% after multiple exposures. The lag effect is the cause...
Invention relates to radiation engineering, namely to radiological imaging systems,
and is used to obtain information on the point spread function (PSF). Essence of the invention lies in the fact that the method of determining the X-ray imaging system point dispersion function further comprises steps, on which from basic point scattering function d...
The shape and size of the projection of the focal spot of an x-ray tube largely depend on the direction of the beam, which results in a spatial difference of the point spread function (PSF) of the imaging system. A model developed for determining the PSF at an arbitrary point of the radiation field is presented in this article. The input data for t...
Объектом работы является модуль рентгеновской визуализации системы
лучевой терапии с контролем по изображениям.
Цель работы – обеспечение требований к характеристикам двумерных проекционных изображений и трехмерной КТ реконструкции для реализации методики лучевой терапии с контролем по изображениям.
Решаются задачи диагностики собственных свойств м...
Method for determining transfer characteristics of pixels of a flat panel X-ray detector includes collecting initial data for several values of absorbed dose in each pixel of a detector matrix, approximation of obtained data by linear relationship, collection of data for taking into account of dark current for each pixel of detector matrix, reading...
Main parameters of digital flat panel detectors, to be taken into account in developing imaging systems are considered. Various factors affecting obtained images are presented. Experimental results presented confirm the necessity of image correction.
