Szkoła doktorska Politechniki Warszawskiej

Wyszukiwarka promotorów i obszarów badawczych

Wykaz obszarów badawczych związanych z tagiem Capacitively-coupled-impedance-tomography-for-anatomical-and-functional-imaging:

# Obszar badawczy Dziedzina naukowa

Electrical tomography allows to visualize a spatial distribution of electrical parameters of tested objects. Until now, electrical impedance tomography (EIT) with sinusoidal excitation was considered to have the greatest potential for application in diagnostic medical imaging among electrical imaging techniques, however impedance of electrode-skin contact, which is a major challenge in this imaging technique, limits the development of this technique and its practical use. It is necessary to acquire new knowledge that will overcome the existing limitations. In this project, an alternative approach with non-contact electrodes and pulse excitation will be investigated.

The aim is to verify the properties of capacitively coupled electrical tomography in the context of diagnostic medical imaging. Studies will be performed using numerical and physical lung phantom, taking into account regional ventilation distribution. Measurement sensitivity, contrast and spatial-temporal resolution of images will be assessed. 3D numerical modeling of a tomographic sensor with capacitance electrodes will be performed. The simulation will be performed for the developed numerical model of a thorax. ECTsim package for MATLAB, developed at the Nuclear and Medical Electronics Division (ZEJiM), will be used to solve forward and inverse problems. Based on calculated distributions of the electric field in a thorax, sensitivity matrices and measurements for the numerical phantom of lungs in exhalation and inspiration will be determined. Non-linear iterative algorithms and deep learning will be used for image reconstruction.


The simulations will allow to determine the optimal parameters of a tomographic sensor, which will be in the form of an elastic belt or a vest worn by the patient. Real measurements on a simple thorax phantom which will simulate the respiratory cycle will be performed. A prototype of a flexible sensor with surface electrodes and a mechanical-electrical lung phantom will be built. Measurements will be performed using the 32-channel electrical capacitance tomograph EVT4, designed and built at ZEJiM. In order to perform the measurements, the signal channels of the tomographic system will be rebuilt in accordance with the results of theoretical considerations and numerical simulation, so as to adapt them to the new concept of measuring electric permittivity and electrical conductivity. Results of the research, evaluation of the sensitivity of measurements, spatial and temporal resolution as well as image quality will be the subject of publications in renowned journals. Modification of the measuring system including electrodes will be the subject of a patent application. The developed scripts for the simulation of the thorax phantom as well as the measurement data and reconstructed images will be made available to the scientific community in public repositories.