Abstract
To make electrical impedance tomography (EIT) measurements, we inject currents into a volume through electrodes, then measure the voltages at the electrodes. In this paper we introduce an 8-electrode EIT measurement system which is completely portable and is based on a PDA instead of a PC. The system is composed of a data acquisition board (E-Pack), a current source, a PDA and software, which was developed in eVC 4.0. The E-pack collects data through a pre-amplifier. The signal is then sampled and demodulated with an AD9240 ADC with 14-bit resolution and 10msps speed, and finally completed through 32 point sampling in the digital signal processor (DSP). For the DSP, we have chosen an Analog Devices ADSP-2181. Custom designed protocol between the PDA and E-Pack enables selection of any current drive and measurement electrode pairs. Images can be reconstructed and displayed on the PDA. We present experimental results for a cylindrical phantom that demonstrate the performance and applicability of our system. Measurements on a 50Ω resistor network show that the precision of our system is better than 0.2%.
| Original language | English (US) |
|---|---|
| Title of host publication | IFMBE Proceedings |
| Publisher | Springer Verlag |
| Pages | 3980-3983 |
| Number of pages | 4 |
| Volume | 14 |
| Edition | 1 |
| State | Published - 2007 |
| Externally published | Yes |
| Event | 10th World Congress on Medical Physics and Biomedical Engineering, WC 2006 - Seoul, Korea, Republic of Duration: Aug 27 2006 → Sep 1 2006 |
Other
| Other | 10th World Congress on Medical Physics and Biomedical Engineering, WC 2006 |
|---|---|
| Country/Territory | Korea, Republic of |
| City | Seoul |
| Period | 8/27/06 → 9/1/06 |
Keywords
- Electrical impedance tomography measurement
- PDA
- Portable device
ASJC Scopus subject areas
- Biomedical Engineering
- Bioengineering