Validation of a 3D reconstruction algorithm for EIT of human brain function in a realistic head-shaped tank
Article
Tidswell, A., Gibson, A., Bayford, R. and Holder, D. 2001. Validation of a 3D reconstruction algorithm for EIT of human brain function in a realistic head-shaped tank. Physiological Measurement. 22 (1), pp. 177-185. https://doi.org/10.1088/0967-3334/22/1/321
| Type | Article |
|---|---|
| Title | Validation of a 3D reconstruction algorithm for EIT of human brain function in a realistic head-shaped tank |
| Authors | Tidswell, A., Gibson, A., Bayford, R. and Holder, D. |
| Abstract | Previous work has demonstrated that electrical impedance tomography can be used to image human brain activity during evoked responses, but two-thirds of the reconstructed images fail to localize an impedance change to the expected stimulated cortical area. The localization failure may be caused by modelling the head as a homogenous sphere in the reconstruction algorithm. This assumption may lead to errors when used to reconstruct data obtained from the human head. In this study a 3D reconstruction algorithm, based on a model of the head as a homogenous sphere, was characterized by simulating the algorithm model, the head shape and the presence of the skull in saline-filled tanks. EIT images of a sponge, 14 cm3 volume with a resistivity contrast of 12%, were acquired in three different positions in tanks filled with 0.2% saline. In a hemispherical tank, 19 cm in diameter, the sponge was localized to within 3.4-10.7% of the tank diameter. In a head-shaped tank, the errors were between 3.1 and 13.3% without a skull and between 10.3 and 18.7% when a real human skull was present. A significant increase in localization error therefore occurs if an algorithm based on a homogeneous sphere is used on data acquired from a head-shaped tank. The increased error is due to the presence of the skull, as no significant increase in error occurred if a head-shaped tank was used without the skull present, compared to the localization error within the hemispherical tank. The error due to the skull significantly shifted the impedance change within the skull towards the centre of the image. Although the increased localization error due to the skull is not sufficient to explain the localization errors of up to 50% of the image diameter present in the images of some human subjects, the future use of a realistic head model in the reconstruction algorithm is likely to reduce the localization error in the human images due to the presence of the skull. |
| Research Group | Biophysics and Bioengineering group |
| Publisher | Institute of Physics |
| Journal | Physiological Measurement |
| ISSN | 0967-3334 |
| Publication dates | |
| Feb 2001 | |
| Publication process dates | |
| Deposited | 26 May 2009 |
| Output status | Published |
| Digital Object Identifier (DOI) | https://doi.org/10.1088/0967-3334/22/1/321 |
| Language | English |
Permalink -
https://repository.mdx.ac.uk/item/81q71
55
total views0
total downloads2
views this month0
downloads this month
Export as
Related outputs
A 1.76 mW, 355-fps, electrical impedance tomography system with a simple time-to-digital impedance readout for fast neonatal lung imaging
Li, J., Jiang, D., Wu, Y., Zhang, J., Seifnaraghi, N., Bayford, R. and Demosthenous, A. 2024. A 1.76 mW, 355-fps, electrical impedance tomography system with a simple time-to-digital impedance readout for fast neonatal lung imaging. IEEE Journal of Solid-State Circuits. https://doi.org/10.1109/JSSC.2024.3434638A current DAC based current generator with fourth-order current-mode filter for electrical impedance tomography
Li, J., Wu, Y., Jiang, D., Bayford, R. and Demosthenous, A. 2024. A current DAC based current generator with fourth-order current-mode filter for electrical impedance tomography. 2024 IEEE International Symposium on Circuits and Systems. Singapore, Singapore 19 - 22 May 2024 IEEE. pp. 1-4 https://doi.org/10.1109/iscas58744.2024.10558679Clinical utility of ultrasound imaging for measuring anterior thigh thickness after anterior cruciate ligament injury in an individual patient to assess postsurgery outcome
Mechelli, F., Bayford, R., Garelick, H., Stokes, M. and Agyapong-Badu, S. 2023. Clinical utility of ultrasound imaging for measuring anterior thigh thickness after anterior cruciate ligament injury in an individual patient to assess postsurgery outcome. Case Reports in Orthopedics. 2023. https://doi.org/10.1155/2023/6672951Live demonstration: a bioimpedance-based robotic hand control platform using a customised neural network
Yao, T., Almarri, N., Wu, Y., Jiang, D., Bayford, R. and Demosthenous, A. 2023. Live demonstration: a bioimpedance-based robotic hand control platform using a customised neural network. 2023 IEEE Biomedical Circuits and Systems Conference (BioCAS). Toronto, Canada 19 - 21 Oct 2023 IEEE. https://doi.org/10.1109/biocas58349.2023.10389001A compact neural network for high accuracy bioimpedance-based hand gesture recognition
Yao, T., Wu, Y., Jiang, D., Bayford, R. and Demosthenous, A. 2023. A compact neural network for high accuracy bioimpedance-based hand gesture recognition. 2023 IEEE Biomedical Circuits and Systems Conference (BioCAS). Toronto, Canada 19 - 21 Oct 2023 IEEE. https://doi.org/10.1109/biocas58349.2023.10388679Effect of routine suction on lung aeration in critically ill neonates and young infants measured with electrical impedance tomography
Händel, C., Becher, T., Miedema, M., Kallio, M., Papadouri, T., Waldmann, A.D., Sophocleous, L., Yerworth, R., Bayford, R., Rimensberger, P.C., van Kaam, A.H. and Frerichs, I. 2023. Effect of routine suction on lung aeration in critically ill neonates and young infants measured with electrical impedance tomography. Scientific Reports. 13 (1). https://doi.org/10.1038/s41598-023-42965-7An 89.3% current efficiency, sub 0.1% THD current driver for electrical impedance tomography
Li, J., Jiang, D., Wu, Y, Neshatvar, N., Bayford, R. and Demosthenous, A. 2023. An 89.3% current efficiency, sub 0.1% THD current driver for electrical impedance tomography. IEEE Transactions on Circuits and Systems II: Express Briefs. 70 (10), pp. 3742-3746. https://doi.org/10.1109/TCSII.2023.3294753Thermodynamics of mechanopeptide sidechains
Haque, M., Kadir, M. and Bayford, R. 2023. Thermodynamics of mechanopeptide sidechains. AIP Advances. 13 (8). https://doi.org/10.1063/5.0154129Effects of patient recumbency position on neonatal chest EIT
Seifnaraghi, N., De Gelidi, S., Frerichs, I., Kallio, M., Sorantin, M., Demosthenous, A. and Bayford, R. 2023. Effects of patient recumbency position on neonatal chest EIT. IEEE Access. 11, pp. 68257 - 68268. https://doi.org/10.1109/ACCESS.2023.3290904Bronchodilator effect on regional lung function in pediatric viral lower respiratory tract infections
Strodthoff, C., Kähkönen, T., Bayford, R., Becher, T., Frerichs, I. and Kallio, M. 2022. Bronchodilator effect on regional lung function in pediatric viral lower respiratory tract infections. Physiological Measurement. 43 (10). https://doi.org/10.1088/1361-6579/ac9450Development of a biosensor for fast point-of-care blood analysis of Troponin
Bayford, R., Damaso, R., Jiang, D., Rahal, M. and Demosthenous, A. 2022. Development of a biosensor for fast point-of-care blood analysis of Troponin. 44th Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC). Glasgow, Scotland, United Kingdom 11 - 15 Jul 2022 IEEE. pp. 910-913 https://doi.org/10.1109/EMBC48229.2022.9871851Generation of anatomically inspired human airway tree using electrical impedance tomography: A method to estimate regional lung filling characteristics
Zamani, M., Kallio, M., Bayford, R. and Demosthenous, A. 2022. Generation of anatomically inspired human airway tree using electrical impedance tomography: A method to estimate regional lung filling characteristics. IEEE Transactions on Medical Imaging. 41 (5), pp. 1125-1137. https://doi.org/10.1109/TMI.2021.3136434Advances in electrical impedance tomography and bioimpedance including applications in COVID-19 diagnosis and treatment
Bayford, R., Rosalind, S. and Frerichs, I. 2022. Advances in electrical impedance tomography and bioimpedance including applications in COVID-19 diagnosis and treatment. Physiological Measurement. 43 (2). https://doi.org/10.1088/1361-6579/ac4e6cA low-power recursive I/Q signal generator and current driver for bioimpedance applications
Hanzaee, F., Neshatvar, N., Rahal, M., Jiang, D., Bayford, R. and Demosthenous, A. 2022. A low-power recursive I/Q signal generator and current driver for bioimpedance applications. IEEE Transactions on Circuits and Systems II: Express Briefs. 69 (10), pp. 4108-4112. https://doi.org/10.1109/TCSII.2022.3187076High frame rate electrical impedance tomography system for monitoring of regional lung ventilation
Rahal, M., Dai, J., Wu, Y., Bardill, A., Bayford, R. and Demosthenous, A. 2022. High frame rate electrical impedance tomography system for monitoring of regional lung ventilation. 44th Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC). Glasgow, Scotland, United Kingdom 11 - 15 Jul 2022 IEEE. pp. 2487-2490 https://doi.org/10.1109/EMBC48229.2022.9871479