A non-invasive magnetic resonance biomedical system

Abstract

This paper proposes a pair of magnetic resonance coupling, which effectively i at the biological medium for potential biomed Calculations and field estimation was done usi modeling software. Ferrite cores were added to showed larger induced current density in the tis times) due to eddy current generation, as comp without core. Further, experiments were con animal tissue placed between two resonating co similar results with an induced current of 0.07 m Also, 1.6 times larger current was induced in ferrite cores were used as compared to air core.

Design and investigation of novel neural stimulation by magnetic resonance coupling

“…This chapter is aimed at proposing a new figure-of-eight [47] coil configuration which improves the coil design with respect to the above mentioned design criteria. The new coil configuration applies the concept of magnetic resonance coupling (MRC) [53] - [55], which is composed of one active driven primary coil and a passive secondary coil coupled with each other, involving transfer of energy, when they are in resonance. Although there are two coils, only one source is required because the secondary coil is driven by the magnetic field radiated from the primary coil.…”

“…On the other hand, the figure-of-eight coil [47] configuration, which is popular in the literature to focus the magnetic field, could also double the current density induced at the tissue. This chapter will present the combination of figure-of-eight coil [47] and MRC [53] - [55], thereby further increasing the current density and ohmic power density induced at the tissue.…”

“…It consists of two identical figure-of-eight coils, namely coil 1 and coil 2, coupled to each other by magnetic resonance coupling[54] -[55],[71]. The detailed structure and operation principle of the system will be explained in the remaining sections.…”

“…Furthermore, based on the tri-mode coil configuration, a formula based methodology is developed for tunable focal point adjustment within the two coils by selecting the operation mode and the input voltage. Although the coupled coils using the magnetic resonance coupling (MRC)[54] -[55],[71] -…”

“…It consists of two identical figure-of-eight coils separated by D = 9 cm (as shown in most representative application for a penetration depth of 4.5 cms), namely coil 1 and coil 2, coupled to each other by magnetic resonance coupling[54] -[55],[71]. Coil 1 is driven by signal generator, which is cascaded to the power amplifier and the multi-impedance matching network.…”