Electrical impedance tomography - My current results

I want to introduce current results in EIT imaging study that are obtained by me. The developed model, algorithms (that are became the heart of written software) and EIT acquisition system were used to get images on artificial phantom. The Matlab was used to implement the reconstruction algorithm and C++/Java were used to write software to collect data from hardware acquisition system.

The finite element model of object under investigation is showed on Fig.1. The 2-D representation of flat container of round shape was used. It consists of 97 nodes and 160 elements. The 16 electrodes that can be used for measurement or current applying are placed surround the object. The 182 observations were collected.

Fig. 1

The FEM model was used to solve forward EIT problem: the electrical potential calculation on mesh nodes and voltage drop calculation on measurement electrodes during current flow thought current electrodes. The potential distribution inside object with assuming homogeneous conductivity distribution is showed on Fig. 2.

Fig. 2

Here I'm present phantom's photos and obtained resistivity images of internal medium (Fig. 3, 4, 5, 6). The coins were used to represent some inhomogeneous.

Fig. 3 (a)

Fig. 3 (b)

Fig. 4 (a)

Fig. 4 (b)

Fig. 5 (a)

Fig. 5 (b)

Fig. 6 (a)

Fig. 6 (b)

The Tikhonov regularization was used to obtain stable solution. The presented EIT images reflect the efficiency and working ability of developed software and hardware, although both of them are in the development state. The further work carried out and 3-D EIT imaging system is under development. 

Sources: 

[1] Шульга Д. И. Определение локальной неоднородности внутри объекта при помощи электроимпедансной томографии / Шульга Д. И. // Интегрированные компьютерные технологии в машиностроении.: тез. докл. Международной научно-технической конференции «ИКТМ’ 2010». 16-20 ноября 2010. — Харьков: Национальный аэрокосмический университет им. Н. Е. Жуковского «ХАИ», 2010. — Том 2. — с. 163. 

[2] Шульга Д.И. Некорректность задачи электроимпедансной томографии, решаемой на конечно-элементной модели / Шульга Д.И., Шульгин В.И. // Современные проблемы радиотехники и телекоммуникаций «РТ-2011».: тез. докл. 7-ой Международной молодежной научно-технический конференции, Севастополь 11-15 апреля 2011. — Севастополь: Севастопольский национальный технический университет (СевНТУ), 2011. — с.332.