Impact of measurement resolution and signal-to-noise ratio of EIT system on reconstruction image
10.3760/cma.j.issn.1673-4181.2015.03.004
- VernacularTitle:EIT系统分辨率和信噪比对图像重建的影响
- Author:
Juan DENG
;
Yan WANG
;
Shu ZHAO
;
Lei WANG
;
Hong WANG
;
Hong SHA
- Publication Type:Journal Article
- Keywords:
Electrical impedance tomography;
Practical measurement system;
Measurement resolution;
Signal-to-noise ratio
- From:
International Journal of Biomedical Engineering
2015;(3):143-147
- CountryChina
- Language:Chinese
-
Abstract:
Objective Practical electrical impedance tomography (EIT) system with certain measurement resolution (MR) and signal-to-noise ratio (SNR) differs a lot from ideal simulation conditions in EIT methodology research. The aim of this paper was to study the impact of practical system with different MR and SNR on EIT. Methods Based on the ideal simulation boundary voltages of adjacent excitation and adjacent measurement pattern, practical systems whose MR were 0.1 mV and 0.01 mV, SNR ranged from 40-80 dB and no noises were simulated, simulation study for three imaging models A, B and C with different positions in the to-be imaged field under practical system conditions above was carried out using the combined Tikhonov-NOSER regularization algorithm, and error of reconstruction (ER) function and structure similarity (SSIM) function were adopted for quantitative evaluation of image effect. Results There are differences between images obtained under different MR and SNR for different image models. In order to obtain images for three models, SNR of system should be at least 40-50 dB when MR was 0.01 mV. For the goal to obtain high quality images of A, B and C, SNR should be 80, 70 and 60 dB respectively. When MR was 0.1 mV, SNR for obtaining images of A, B, C were 60, 50 and 40 dB. Moreover, the improvement of images with increasing SNR under MR of 0.1 mV was not as obvious as that of MR at 0.01 mV. Conclusions Blind pursuit of single high SNR is of no help to improve system performance and image reconstruction effect except increasing the difficulties in hardware design. The extremity SNR is 50-60 dB for system with MR of 0.01 mV and 60-70 dB for system with MR of 0.1 mV.
