Predicting temperature increase through local SAR estimation by B1 mapping: a phantom validation at 7T.
Predicting temperature increase through local SAR estimation by B1 mapping: a phantom validation at 7T.
复制标题
通过 B1 映射进行局部 SAR 估计来预测温度升高：7T 的模型验证。
DOI：
10.1109/embc.2014.6943788
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
He,Bin
中科院分区：
文献类型：
--
作者：
Zhang,Xiaotong;Liu,Jiaen;Schmitter,Sebastian;VandeMoortele,Pierre-Francois;He,Bin
研究表明，生物组织的电特性 d(EPs) 可以通过基于 MR 的 B1 测量得出。这些“电气特性断层扫描”(EPT) 方法的一个强大吸引力是估计由射频传输引起的实时和特定主题的局部特定吸收率 (SAR)。为了研究基于 EPT 的局部 SAR 估计的可行性，按照先前提出的 EPT 协议，首先在 7T 加热序列的 B1 匀场设置下估计诱导局部 SAR；而使用相同的 B1 信息，可以进一步预测不同 B1 匀场设置下的感应局部 SAR。两个 SAR 结果均与使用基于质子化学位移的 MRI 测温法测量的温度变化进行了比较。
It has been shown that Electrical Properties d(EPs) of biological tissues can be derived from MR-based B1 measurement. A strong appeal for these `Electrical Property Tomography' (EPT) methods is to estimate real-time and subject-specific local specific absorption rate (SAR) induced by RF transmission. In order to investigate the feasibility of EPT-based local SAR estimation, following previously proposed EPT protocols, induced local SAR has been firstly estimated under one B1 shim setting for a heating sequence at 7T; whereas with the same acquired B1 information, induced local SAR under a different B1 shim setting has been further predicted. Both of the SAR results have been compared to measured temperature changes using MRI Thermometry based on the proton chemical shift.