Conductivity and permittivity imaging at 3.0T.

Conductivity and permittivity imaging at 3.0T.
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电导率和介电常数成像为3.0t。

DOI:
10.1002/cmr.b.21204
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发表时间:
2012-02-01
期刊:
Concepts in magnetic resonance. Part B, Magnetic resonance engineering
影响因子:
--
通讯作者:
Yeo DT
Yeo DT
中科院分区:
其他
文献类型:
--
作者:
Bulumulla SB;Lee SK;Yeo DT

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在磁共振成像(MRI)过程中,组织电导率和介电常数对于理解局部射频(RF)功率沉积至关重要。这些电特性在射频热疗法(如射频热疗)的治疗计划中也很重要。电学性质也可能具有诊断价值,因为据报道恶性组织比周围的健康组织具有更高的电导率和更高的相对介电常数。在本研究中,我们使用3.0特斯拉的MRI透射场图(B1+图)考虑成像电导率和介电常数。我们制定了从二维B1+数据计算电导率和相对介电常数的有效方法,并在128 MHz产生的模拟B1+图上验证了方法。接下来,我们使用最近引入的Bloch-Siegert位移B1+映射方法来获取3.0 Tesla下的B1+映射,并演示电导率和相对介电常数图像,成功识别电学性质的对比度。
Tissue conductivity and permittivity are critical to understanding local radio frequency (RF) power deposition during magnetic resonance imaging (MRI). These electrical properties are also important in treatment planning of RF thermotherapy methods (e.g. RF hyperthermia). The electrical properties may also have diagnostic value as malignant tissues have been reported to have higher conductivity and higher relative permittivity than surrounding healthy tissue. In this study, we consider imaging conductivity and permittivity using MRI transmit field maps (B1+ maps) at 3.0 Tesla. We formulate efficient methods to calculate conductivity and relative permittivity from 2-dimensional B1+ data and validate the methods with simulated B1+ maps, generated at 128 MHz. Next we use the recently introduced Bloch-Siegert shift B1+ mapping method to acquire B1+ maps at 3.0 Tesla and demonstrate conductivity and relative permittivity images that successfully identify contrast in electrical properties.
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