Makale detayı · 1994
Electrical impedance tomography using induced currents
- Yıl
- 1994
- Tür
- article
Veri kaynağı ayrımı
- YÖKSİS YÖKSİS makale kaydı
- YÖKSİS dergi adı IEEE Transactions on Medical Imaging
- Katalog eşleşmesi (ISSN) IEEE Transactions on Medical Imaging
- OpenAlex OpenAlex zenginleştirmesi (özet, atıf, konular)
Özet
OpenAlex · İngilizce
The mathematical basis of a new imaging modality, induced current electrical impedance tomography (EIT), is investigated, The ultimate aim of this technique is the reconstruction of conductivity distribution of the human body, from voltage measurements made between electrodes placed on the surface, when currents are induced inside the body by applied time varying magnetic fields. In this study the two-dimensional problem is analyzed. A specific 9-coil system for generating nine different exciting magnetic fields (50 kHz) and 16 measurement electrodes around the object are assumed, The partial differential equation for the scaler potential function in the conductive medium is derived and finite element method (FEM) is used for its solution. Sensitivity matrix, which relates the perturbation in measurements to the conductivity perturbations, is calculated. Singular value decomposition of the sensitivity matrix shows that there are 135 independent measurements. It is found that measurements are less sensitive to changes in conductivity of the object's interior. While in this respect induced current EIT is slightly inferior to the technique of injected current EIT (using Sheffield protocol), its sensitivity matrix is better conditioned. The images obtained are found to be comparable to injected current EIT images In resolution. Design of a coil system for which parameters such as sensitivity to inner regions and condition number of the sensitivity matrix are optimum, remains to be made.
Konular
Atıflar
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82 atıf
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Yerel katalogda bu makaleye atıf yapan 24 yayın (OpenAlex referans eşleşmesi; tam dünya listesi değildir).
- Sensitivity of EEG and MEG measurements to tissue conductivity 2004
- Electrical conductivity imaging via contactless measurements 1999
- Electrical conductivity imaging via contactless measurements 1999
- Electrical impedance tomography induced current imaging achieved with a multiple coil system 1996
- Differential characterization of neural sources with the bimodal truncated SVD pseudo inverse for EEG and MEG measurements 1998
- Forward problem solution for electrical conductivity imaging via contactless measurements 1999
- Forward problem solution for electrical conductivity imaging via contactless measurements 1999
- Lorentz force electrical impedance tomography using magnetic field measurements 2016
- Lorentz force electrical impedance tomography using magnetic field measurements 2016
- Distinguishability analysis of an induced current EIT system using discrete coils 2000