Abstract
The structure of the software for electric impedance tomography has been presented. This structure of application construction makes it possible to carry out the real-time EIT research and can be implemented on medical and technical devices, in particular, integrated into AVL devices. The algorithm for visualization of the results of conductivity field reconstruction was presented. Within this algorithm, there are two approaches to presenting color models and selecting colors for each particular finite element. The choice of one of these approaches depends on the needs of the study and leads either to faster performance, or to the higher quality of an image. The algorithm of neighboring finite elements, allowing reducing the time consumed to visualize the model by uniting neighboring elements with a similar color in one polygon, has been proposed. Reducing the number of finite elements leads to a higher speed of their output on the screen. A list of graphics libraries that can be used for the problems of visualization of the results of electric impedance tomography was presented. As a result of the research, it was found that among the analyzed libraries, the best time is demonstrated by the OpenGL library, which ensures the visualization of 0.02 s faster than in the case of the analogs. This is due to the high operation speed, which is provided by the implementation of the GPU visualization. It was shown that the use of the proposed algorithm of neighboring finite elements actually allows reducing the time spent on displaying the model on the screen from 0.05 s to 0.03 s for the OpenGL library. At the same time, the total time spent on visualization depends on the used graphics library. The obtained data can be used in the development of medical visualization systems, which should meet increased requirements in terms of the amount of displayed information
Highlights
Electric impedance tomography (EIT) [1] is the method for medical visualization [2] of the distribution of specific resistance of the human body
This is because the model of an object is split into many finite elements, the colors of which are re-calculated every time the data arrive from the measuring device
To do the works related to the development of the EIT channel layout, there arises a need to develop a new user graphics interface that would take into consideration all the specific features of the conductivity field visualization, including real-time dynamic visualization and interactive control of measurement and control parameters
Summary
Electric impedance tomography (EIT) [1] is the method for medical visualization [2] of the distribution of specific resistance of the human body (or internal organs). To do the works related to the development of the EIT channel layout, there arises a need to develop a new user graphics interface that would take into consideration all the specific features of the conductivity field visualization, including real-time dynamic visualization and interactive control of measurement and control parameters. Because the color of the elements changes every time the data arrive from the measuring device, a graphics library should visualize the model at sufficient speed This criterion is extremely important for determining the perfusion of the patient’s lungs, as the heart contraction rate is much higher than the frequency of inhalations/exhalations used to display the lungs ventilation; 3) compatibility with medical equipment. The structure of the software of visualization of the EIT measurements makes it possible to measure the differences of potentials recorded on the electrodes located on the patient’s body, to compute the conductivity field, and visualize the tomographic cross-section in real-time. Computation of values of colors based on the ratio of conductivity field values Ω to maximal element σ(max)
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