TY - JOUR
T1 - B1-based SAR reconstruction using contrast source inversion–electric properties tomography (CSI-EPT)
AU - Balidemaj, Edmond
AU - van den Berg, Cornelis A.T.
AU - van Lier, Astrid L.H.M.W.
AU - Nederveen, Aart J.
AU - Stalpers, Lukas J.A.
AU - Crezee, Hans
AU - Remis, Rob F.
N1 - Publisher Copyright:
© 2016, The Author(s).
PY - 2017/2/1
Y1 - 2017/2/1
N2 - Specific absorption rate (SAR) assessment is essential for safety purposes during MR acquisition. Online SAR assessment is not trivial and requires, in addition, knowledge of the electric tissue properties and the electric fields in the human anatomy. In this study, the potential of the recently developed CSI-EPT method to reconstruct SAR distributions is investigated. This method is based on integral representations for the electromagnetic field and attempts to reconstruct the tissue parameters and the electric field strength based on B1+ field data only. Full three-dimensional FDTD simulations using a female pelvis model are used to validate two-dimensional CSI reconstruction results in the central transverse plane of a 3T body coil. Numerical experiments demonstrate that the reconstructed SAR distributions are in good agreement with the SAR distributions as determined via 3D FDTD simulations and show that these distributions can be computed very efficiently in the central transverse plane of a body coil with the two-dimensional approach of CSI-EPT.
AB - Specific absorption rate (SAR) assessment is essential for safety purposes during MR acquisition. Online SAR assessment is not trivial and requires, in addition, knowledge of the electric tissue properties and the electric fields in the human anatomy. In this study, the potential of the recently developed CSI-EPT method to reconstruct SAR distributions is investigated. This method is based on integral representations for the electromagnetic field and attempts to reconstruct the tissue parameters and the electric field strength based on B1+ field data only. Full three-dimensional FDTD simulations using a female pelvis model are used to validate two-dimensional CSI reconstruction results in the central transverse plane of a 3T body coil. Numerical experiments demonstrate that the reconstructed SAR distributions are in good agreement with the SAR distributions as determined via 3D FDTD simulations and show that these distributions can be computed very efficiently in the central transverse plane of a body coil with the two-dimensional approach of CSI-EPT.
KW - Electric properties tomography (EPT)
KW - B1 maps
KW - Conductivity
KW - Contrast source inversion (CSI)
KW - Specific absorption rate (SAR)
KW - Electric properties tomography (EPT)
UR - http://www.scopus.com/inward/record.url?scp=84964283824&partnerID=8YFLogxK
U2 - 10.1007/s11517-016-1497-6
DO - 10.1007/s11517-016-1497-6
M3 - Article
C2 - 27108291
SN - 0140-0118
VL - 55
SP - 225
EP - 233
JO - Medical & Biological Engineering & Computing
JF - Medical & Biological Engineering & Computing
IS - 2
ER -