EXTRACTION OF CONDUCTIVITY AND PERMITTIVITY USING MAGNETIC-RESONANCE-IMAGING
EXTRACTION OF CONDUCTIVITY AND PERMITTIVITY USING MAGNETIC-RESONANCE-IMAGING
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DOI：
10.1088/0031-9155/36/6/002
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发表时间：
1991-06-01
影响因子：
3.5
通讯作者：
WU, DH
中科院分区：
文献类型：
--
作者：
HAACKE, EM;PETROPOULOS, LS;WU, DH
在磁共振（MR）成像中对RF穿透效应进行建模需要了解电导率和介电常数的局部值。使用MR图像本身确定被研究材料的电特性的逆问题先前没有被解决。我们审查这样的方法的非均匀层模型，并检查几何形状和信噪比的参数敏感性。对于少层系统，将电特性提取到10%以内或更好是在当今MR系统的范围内。然后，电气特性的知识将允许更好地预测高场下的RF穿透和功率沉积。
Modeling the effects of RF penetration in magnetic resonance (MR) imaging requires a knowledge of the local values of conductivity and permittivity. The inverse problem of determining the electric properties of the material under investigation using the MR images themselves has not previously been addressed. We review such an approach for the heterogeneous layer model and examine the parameter sensitivity to geometry and signal-to-noise ratio. For a few-layer system, it is within the realm of present day MR systems to extract the electric properties to within 10% or better. Knowledge of the electrical properties will then allow a better prediction of the RF penetration and power deposition at high fields.