Quasistatic Solutions versus Full-Wave Solutions of Single-Channel Circular RF Receive Coils on Phantoms of Varying Conductivities at 3 Tesla

Figure 4

(a) Axial images of the magnetic field magnitude for the quasistatic and full-wave simulations when simulated with a 6 cm diameter coil element on four cylindrical phantoms of varying sizes. The phantoms have the following diameter/height in centimeters for the full (27.8/10.1), half (13.9/5.1), quarter (7.0/2.5), and eighth (3.5/1.3). (b) Axial images of the electric field magnitude for the quasistatic and full-wave simulations when simulated with a 6 cm diameter coil element on four cylindrical phantoms of varying sizes. (c) Axial images of the phase for the quasistatic and full-wave simulations when simulated with a 6 cm diameter coil element on four cylindrical phantoms of varying sizes. (d) Plot showing the convergence of the quasistatic method to the full-wave method as sample size is reduced. The RMSE was calculated using equation (1a)) with c equal to one and S and M being the magnitude of the magnetic fields of the quasistatic and full-wave simulations, respectively. The data points were fit with a third-order polynomial, starting with the leading coefficient; the coefficients are 0.51, 0.38, 0.02, and 0.00. For reference, see Figure 4(a).

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(b)

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(d)