TY - JOUR
T1 - The use of MR B1+ imaging for validation of FDTD electromagnetic simulations of human anatomies
AU - Van Den Berg, Cornelis A.T.
AU - Bartels, Lambertus W.
AU - Van Den Bergen, Bob
AU - Kroeze, Hugo
AU - De Leeuw, Astrid A.C.
AU - Van De Kamer, Jeroen B.
AU - Lagendijk, Jan J.W.
PY - 2006/10/7
Y1 - 2006/10/7
N2 - 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 mm3 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.
AB - 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 mm3 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.
UR - http://www.scopus.com/inward/record.url?scp=33748950980&partnerID=8YFLogxK
U2 - 10.1088/0031-9155/51/19/001
DO - 10.1088/0031-9155/51/19/001
M3 - Article
C2 - 16985267
AN - SCOPUS:33748950980
SN - 0031-9155
VL - 51
SP - 4735
EP - 4746
JO - Physics in medicine and biology
JF - Physics in medicine and biology
IS - 19
M1 - 001
ER -