modeling of electrically triggered tunable magnetic metamaterial hat for multifunctional control in mri applications

Acquisition of images without surgical interposition into human body was possible due to magnetic resonance imaging (mri) mechanism. we introduced noteworthy properties of specific combination of copper surface coils as tunable hybridized magnetic metamaterial hat (thmmh). in thmmh, some of the surface coil slots were loaded with capacitor elements and parallel merger of discrete edge ports as externally applied sinusoidal steady-state current source (is). we highlighted the significance of is, as it could make the design tunable and reconfigurable without any requirement of it being re-designed/re-fabricated. efficiency comparison between thmmh and previously reported work (un-tunable hybridized magnetic metamaterial hat, hmmh) was analyzed. we concluded that thmmh exhibited better magnetic field (b-field) and snr into region of interest (roi) at the rat’s brain, as well as shown strong resonance in comparison to previously reported work on the rat’s brain imaging for 7-t mri. in addition, thmmh excited two eigenmodes simultaneously, which exploited its properties as hybridized magnetic material. furthermore, relative negative permeability, μr = − 3.5+j20.2 for thmmh as case i and μr = − 5.5+j36.3 for un-tunable hmmh as case ii were achieved at 300 mhz for 7-t mri and for comparison purpose.