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  • Title: The use of MR B+1 imaging for validation of FDTD electromagnetic simulations of human anatomies.
    Author: Van den Berg CA, Bartels LW, van den Bergen B, Kroeze H, de Leeuw AA, Van de Kamer JB, Lagendijk JJ.
    Journal: Phys Med Biol; 2006 Oct 07; 51(19):4735-46. PubMed ID: 16985267.
    Abstract:
    In this study, MR B(+)(1) imaging is employed to experimentally verify the validity of FDTD simulations of electromagnetic field patterns in human anatomies. Measurements and FDTD simulations of the B(+)(1) field induced by a 3 T MR body coil in a human corpse were performed. It was found that MR B(+)(1) imaging is a sensitive method to measure the radiofrequency (RF) magnetic field inside a human anatomy with a precision of approximately 3.5%. A good correlation was found between the B(+)(1) measurements and FDTD simulations. The measured B(+)(1) pattern for a human pelvis consisted of a global, diagonal modulation pattern plus local B(+)(1) heterogeneties. It is believed that these local B(+)(1) field variations are the result of peaks in the induced electric currents, which could not be resolved by the FDTD simulations on a 5 mm(3) simulation grid. The findings from this study demonstrate that B(+)(1) imaging is a valuable experimental technique to gain more knowledge about the dielectric interaction of RF fields with the human anatomy.
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