Abstract:In this paper, Specific Absorption Rates (SAR) inside the human head and hand have been analyzed for a handheld mobile phone operated at GSM 900 band. Both the head and hand are modeled electrically using Digital Imaging and Communication in Medicine (DICOM) formatted CT Scan voxel data considering the electrical parameters of different internal anatomical structures. Three-dimensional Finite Difference in Time Domain (FDTD) method has been used to simulate SAR induced in the head and hand. Maximum peak 1-g an… Show more
“…Once the conductivity grows sufficiently large, the upper and lower media become more impermeable and progressively their contribution to the total magnetic field in the vicinity of the receiver declines. The new analytical solution then coincides with the original D&D. However, the range of conductivity of media from 0 to 10 S/m is critical for MI communication applications because the conductivities of human tissues and organs, water, sea water and most soil types fall in that range [8,9].…”
Section: Mutual Inductancesupporting
confidence: 53%
“…Also, since the MI waveguides are constructed from isolated discrete resonators, they can be quite flexible and resilient compared to a continuous traditional waveguide. While most materials in nature are nonmagnetic, they are often conductive [8,9], resulting in an attenuation of the near fields which enable the coupling between resonators. When an MI waveguide is embedded in a conductive medium, eddy currents generated by the coupling magnetic flux are, in general, expected to lower the inter-element coupling strength, which will in turn reduce the MI waveguide bandwidth and increase their attenuation.…”
Section: Introductionmentioning
confidence: 99%
“…Apart from wireless underground/underwater communications networks (WUCNs), the study of coupled resonant coils immersed in a dissipative medium is of great interest in embedded biomedical systems and in body area networks for health-related applications, since the human body and other biological tissues are moderately conductive at microwave frequencies within the range of conductivity from about 0.05 S/m (fat) to about 1.5 S/m (blood) [9].…”
Abstract. An approximate solution is developed for the mutual inductance of two circular coils enclosed by insulating cavities in a conducting medium. This solution is used to investigate the variation of the mutual inductance upon the conductivity of the background (e.g., soil, seawater or human body), as well as upon other parameters such as the vertical of the coils and the displacement of one of the coils in the horizontal plane. Our theoretical results are compared with full wave simulations and a previous solution valid when a conductive slab is inserted between two coupled resonant coils. The proposed approach can have direct impact on the design and optimisation of magnetoinductive waveguides and wireless power transfer for underground/underwater networks and embedded biomedical systems.
“…Once the conductivity grows sufficiently large, the upper and lower media become more impermeable and progressively their contribution to the total magnetic field in the vicinity of the receiver declines. The new analytical solution then coincides with the original D&D. However, the range of conductivity of media from 0 to 10 S/m is critical for MI communication applications because the conductivities of human tissues and organs, water, sea water and most soil types fall in that range [8,9].…”
Section: Mutual Inductancesupporting
confidence: 53%
“…Also, since the MI waveguides are constructed from isolated discrete resonators, they can be quite flexible and resilient compared to a continuous traditional waveguide. While most materials in nature are nonmagnetic, they are often conductive [8,9], resulting in an attenuation of the near fields which enable the coupling between resonators. When an MI waveguide is embedded in a conductive medium, eddy currents generated by the coupling magnetic flux are, in general, expected to lower the inter-element coupling strength, which will in turn reduce the MI waveguide bandwidth and increase their attenuation.…”
Section: Introductionmentioning
confidence: 99%
“…Apart from wireless underground/underwater communications networks (WUCNs), the study of coupled resonant coils immersed in a dissipative medium is of great interest in embedded biomedical systems and in body area networks for health-related applications, since the human body and other biological tissues are moderately conductive at microwave frequencies within the range of conductivity from about 0.05 S/m (fat) to about 1.5 S/m (blood) [9].…”
Abstract. An approximate solution is developed for the mutual inductance of two circular coils enclosed by insulating cavities in a conducting medium. This solution is used to investigate the variation of the mutual inductance upon the conductivity of the background (e.g., soil, seawater or human body), as well as upon other parameters such as the vertical of the coils and the displacement of one of the coils in the horizontal plane. Our theoretical results are compared with full wave simulations and a previous solution valid when a conductive slab is inserted between two coupled resonant coils. The proposed approach can have direct impact on the design and optimisation of magnetoinductive waveguides and wireless power transfer for underground/underwater networks and embedded biomedical systems.
“…These models were represented by equations of planes, spheres, cones, ellipsoids, elliptical cylinders or cylinders and do not conform to the shape of real anatomical organs. To obtain more accurate result, free and non-free voxel-based computational models constructed from CT/MR/ultrasound scan data came in the research domain (21)(22)(23)(24)(25)(26)(27). However these models are not suitable for subject specific investigations.…”
Section: Subject Specific Rfa Planning Using Ct/mr Based Dicom Data Amentioning
confidence: 99%
“…The header contains a Service-Object Pair (SOP) instance related to Information Object Definition (IOD) (29) which is useful for voxelization of scanned organ. The voxel-based tomographic computational model can be constructed by stacking up the medical images embedded within the DICOM files (23). In this study, the required computational electrical model has been constructed from PET-CT image data set available in DICOM format.…”
Section: Read Ct/mr Scan Based Dicom Datamentioning
In this paper, steady state temperature variations in the human brain due to different electrical and physical changes have been studied considering different thermal ablation treatment requirements using RF probe. Initially, a subject specific voxel-based electrical model has been constructed from Digital Imaging and Communication in Medicine (DICOM) formatted Computed Tomography (CT) or Magnetic Resonance (MR) based image stacks with different pixel characteristics using the Hounsfield unit extraction technique. This subject specific electrical model that consists of different dielectric constant and conductivity, considering different anatomical organs and tissues is simulated using commercially available finite integral technique (FIT) based EM simulation software CST Microwave Studio Ò . This study clearly shows the possibility of subject specific precise offline microwave thermal ablation treatment planning.
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