Tushar Kanti Bera, Samir Kumar Biswas, K. Rajan and J. Nagaraju
inherent ill-posedness of the system, direct analytical methods fail to get the unique solution of this problem and hence a minimization algorithm [ 39 , 40 , 41 ] is found as the best way to obtain its approximate solution. In the minimization algorithm, an objective function, formed by the difference between the experimental or measured data (V m ) and the model predicted data (V c ), is minimized by the Gauss-Newton method [ 39 , 40 , 41 , 42 , 43 ] to find the approximate solution.
Conductivity reconstruction in EIT is a nonlinear, highly ill-posed [ 39 , 40
ongoing and continuous within the scientific community. Internet-based data search systems today trace REG literature back for decades. These articles illustrate the wide spectrum of REG research; however, a literature review is beyond the scope of this article. A search in Medline/Pubmed using the keyword ‘rheoencephalography’ produced 297 hits including three reviews and three free full tests; a Google search resulted in 21, 200 hits (December 27, 2009). REG is included in a recent international book-length publication [ 3 ] and is mentioned as a potential method for
Magnetic induction tomography spectroscopy (MITS), the combination of magnetic induction tomography (MIT) [ 1 , 2 , 3 ] and magnetic induction spectroscopy (MIS) [ 4 , 5 ], is a contactless, non-invasive near-field imaging modality aiming at the reconstruction of the passive electromagnetic properties (PEP) of different materials. MITS requires time-harmonic excitation (primary) magnetic fields to be coupled from a transmitting coil array to the material under investigation. As a direct consequence, eddy currents will be induced in the
and its properties in vivo due to the diverse functions of the skin and the factors affecting the skin condition. To date, a range of different techniques – confocal Raman spectrometer [ 1 ], optical coherence tomography [ 2 ], reflectance confocal microscopy [ 3 ], ultrasound imaging [ 4 ], biopsy [ 5 ] and transepidermal water loss in combination with stratum corneum stripping [ 6 , 7 ] – have been employed to determine the thickness of skin with findings that often vary from one method to another. The situation is exacerbated when attempts are made to measure