System and SAR characterization in parallel RF transmission.
System and SAR characterization in parallel RF transmission.
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DOI：
10.1002/mrm.23126
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发表时间：
2012-05
影响因子：
3.3
通讯作者：
Sodickson, Daniel K.
中科院分区：
文献类型：
--
作者：
Zhu, Yudong;Alon, Leeor;Deniz, Cem M.;Brown, Ryan;Sodickson, Daniel K.
关键词：
The markedly increased degrees of freedom introduced by parallel RF transmission present both opportunities and challenges for SAR management. On the one hand they enable E field tailoring and SAR reduction while facilitating excitation profile control. On the other hand they increase the complexity of SAR behavior and the risk of inadvertently exacerbating SAR by improper design or playout of RF pulses. The substantial subject-dependency of SAR in high field MR can be a compounding factor. Building upon a linear system concept and a calibration scheme involving a finite number of in situ measurements, the present work establishes a clinically applicable method for characterizing global SAR behavior as well as channel-by-channel power transmission. The method offers a unique capability of predicting, for any excitation, the SAR and power consequences that are specific to the subject to be scanned and the MRI hardware. The method was validated in simulation and experimental studies, showing promise as the foundation to a prospective paradigm where power and SAR are not only monitored but, through prediction-guided optimization, proactively managed.
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3.3
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通讯作者：
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