B1-based SAR reconstruction using contrast source inversion–electric properties tomography (CSI-EPT)

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• 作者：Edmond Balidemaj…
• 关键词：B1 maps ; Specific absorption rate (SAR) ; Contrast source inversion (CSI) ; Electric properties tomography (EPT) ; Conductivity
• 刊名：Medical & Biological Engineering & Computing
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：55
• 期：2
• 页码：225-233
• 全文大小：2195KB
• 刊物类别：Engineering
• 刊物主题：Human Physiology; Biomedical Engineering; Imaging / Radiology; Computer Applications;
• 出版者：Springer Berlin Heidelberg
• ISSN：1741-0444
• 卷排序：55

文摘

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 \(B_{1}^{ + }\) 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.