Szkoła doktorska Politechniki Warszawskiej

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.

• Słowa kluczowe: Capacitively coupled impedance tomography for anatomical and functional imaging |