SAR simulation for chiral waves in head model
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| Format: | Artículo científico |
| Langue: | en |
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Universidad de Tarapacá
2003
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| _version_ | 1876480325929926656 |
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| author | Mario Zamorano L. |
| author_facet | Mario Zamorano L. |
| contents | SAR simulation for chiral waves in head model Mario Zamorano L. Héctor Torres S. Ingeniería SAR FDTD chirality Maxwell equations A numerical model of an electromagnetic wave, propagating in a chiral media, characterized by the Born-Fedorovformalism, is presented. FDTD numerical method, adapted to chiral media, is used. The classical Yee algorithm,implemented by several authors for non chiral media, does not provide, for the same time instant, knowledge of thetransverse field components (both incident and induced by the chirality). This problem is solved by the authors, delayingone of the field components when it incides in the achiral-chiral interface, storing the values corresponding to the timesn and n 1, in order to solve for the the field at time n+1. The simulation results of propagating Gaussian pulses inchiral media, in the range of microwaves, show the chiral curl of the polarization plane. The results show that the use ofthe box model in combination with a realistic model of the head derived of a resonance image, is important for accuratedetermination of the near chiral fields induced in the head. It was found that, through SAR (Specific Absorption Rate)parameter, about 20% of the antenna input power is absorbed in the head. It is proposed that the chiral effect is due toa microscopic mechanism, where the typical cell membrane is a fairly fluid bilipid layer, with a few big proteinmolecules embedded in it. Every protein molecule is polar and will tend to align itself with an electric field and oftenrotate helically in its socket, so any volume of brain tissue must have a few cells bearing protein molecules that happento resonate at its rotation frequency. 2003 artículo científico 0717-1072 https://www.redalyc.org/articulo.oa?id=11411201 en http://www.redalyc.org/revista.oa?id=114 Revista Facultad de Ingeniería application/pdf Universidad de Tarapacá Revista Facultad de Ingeniería (Chile) Num.1 Vol.11 |
| format | Artículo científico |
| id | redalyc_11411201 |
| institution | Redalyc |
| language | en |
| publishDate | 2003 |
| publisher | Universidad de Tarapacá |
| spellingShingle | SAR simulation for chiral waves in head model Mario Zamorano L. Ingeniería SAR FDTD chirality Maxwell equations SAR simulation for chiral waves in head model Mario Zamorano L. Héctor Torres S. Ingeniería SAR FDTD chirality Maxwell equations A numerical model of an electromagnetic wave, propagating in a chiral media, characterized by the Born-Fedorovformalism, is presented. FDTD numerical method, adapted to chiral media, is used. The classical Yee algorithm,implemented by several authors for non chiral media, does not provide, for the same time instant, knowledge of thetransverse field components (both incident and induced by the chirality). This problem is solved by the authors, delayingone of the field components when it incides in the achiral-chiral interface, storing the values corresponding to the timesn and n 1, in order to solve for the the field at time n+1. The simulation results of propagating Gaussian pulses inchiral media, in the range of microwaves, show the chiral curl of the polarization plane. The results show that the use ofthe box model in combination with a realistic model of the head derived of a resonance image, is important for accuratedetermination of the near chiral fields induced in the head. It was found that, through SAR (Specific Absorption Rate)parameter, about 20% of the antenna input power is absorbed in the head. It is proposed that the chiral effect is due toa microscopic mechanism, where the typical cell membrane is a fairly fluid bilipid layer, with a few big proteinmolecules embedded in it. Every protein molecule is polar and will tend to align itself with an electric field and oftenrotate helically in its socket, so any volume of brain tissue must have a few cells bearing protein molecules that happento resonate at its rotation frequency. 2003 artículo científico 0717-1072 https://www.redalyc.org/articulo.oa?id=11411201 en http://www.redalyc.org/revista.oa?id=114 Revista Facultad de Ingeniería application/pdf Universidad de Tarapacá Revista Facultad de Ingeniería (Chile) Num.1 Vol.11 |
| title | SAR simulation for chiral waves in head model |
| topic | Ingeniería SAR FDTD chirality Maxwell equations |
| url | https://www.redalyc.org/articulo.oa?id=11411201 |