Advances in Electromagnetic Fields in Living Systems by James C. Lin (auth.), James C. Lin (eds.) PDF

By James C. Lin (auth.), James C. Lin (eds.)

ISBN-10: 1461368863

ISBN-13: 9781461368861

ISBN-10: 1461542030

ISBN-13: 9781461542032

This is the 3rd quantity within the sequence, during which the subject of the results of radio frequencies on human tissue, now more and more a priority with the superiority of mobile phones, is explored by way of Prof. Lin and different researchers. The effect of electromagnetics on imaging and cardiology, either very prepared components of analysis at the moment, can also be explored.

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The induced electric fields are polarization dependent in that they are always in a plane perpendicular to the magnetic field [Durney et al. 1975]. The eddy current loop is the largest when the dimension of the homogeneous region is the largest. , = 1201t ohms. The electric and magnetic field induced absorption would be equally significant if the applied electric strength is 601t times stronger than the applied magnetic field. The same is true if the size of the body is 1I601t of a 21 2m H Horizontal HField ~ Spheroidal Model Vertical H Field Figure 10.

In general, the shorter the subject, the higher the resonance frequency and vice versa. And E-polarization couples RF energy most efficiently to the body in a plane wave field for frequencies up to and slightly above the resonance region. 2, the average SAR is characterized by a f dependence. 0. 4 and then falls off as lIf. , 1- power reflection coefficient. The resonances are not nearly as well defined for H-polarization as for E-polarization. The average SAR for H-polarization gradually reaches a plateau throughout the RF spectrum [Lin and Gandhi, 1996].

90 0 pulse ! 1800 pulse ! _ .. _ _ ... - _- t Echo time Figure 3. Spin echo (SE) signal. By shimming, or improving the homogeneity of the main static magnetic field, the T2' value is made long. The FID signal qS from spins in an i:1homogeneous static magnetic field can be expressed as After spins are excited by a 90 0 pulse, the vector of magnetization Mo on the xy-plane begins to decay in amplitude by T2' relaxation. However, if a 180 0 pulse follows immediately, the phases are refocused to be coherent and the spins generate an echo [Hahn, 1950].

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Advances in Electromagnetic Fields in Living Systems by James C. Lin (auth.), James C. Lin (eds.)

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