Average SAR prediction, validation, and evaluation for a compact MR scanner head-sized RF coil.
Average SAR prediction, validation, and evaluation for a compact MR scanner head-sized RF coil.
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DOI：
10.1016/j.mri.2021.10.011
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发表时间：
2022-01
影响因子：
2.5
通讯作者：
Foo TK
中科院分区：
文献类型：
--
作者：
Tarasek MR;Shu Y;Kang D;Tao S;Gray E;Huston J 3rd;Hua Y;Yeo DTB;Bernstein MA;Foo TK
最近开发的具有高性能梯度的紧凑型3T（C3T）MRI扫描仪具有专用射频（RF）发射线圈，其在头部优先扫描期间仅暴露头部、颈部和上半身区域的一小部分。由于独特的线圈几何形状和患者定位，用于传统全身扫描仪的已建立SAR模型无法直接转换为C3T。在这里，特定吸收率（SAR）的估计和验证框架的开发和使用，以实现一个专用的和准确的SAR预测模型的C3T。定义并评价了C3T的两种不同SAR预测模型：一种基于解剖学推导的暴露质量，另一种使用位于射频线圈尾部的固定解剖位置来确定暴露质量。经过线圈建模和虚拟人体仿真后，设计的SAR预测模型在C3 T上实现，并通过量热法和体内扫描功率监测进行验证。选择固定分界暴露质量模型作为适当的暴露质量区域，以准确估计C3T上患者体内的SAR沉积。
A recently developed compact 3T (C3T) MRI scanner with high performance gradients has a dedicated radiofrequency (RF) transmit coil that exposes only the head, neck and a small portion of the upper body region during head-first scanning. Due to the unique coil geometry and patient positioning, the established SAR model used for a conventional whole-body scanner cannot be directly translated to the C3T. Here a specific absorption rate (SAR) estimation and validation framework was developed and used to implement a dedicated and accurate SAR prediction model for the C3T. Two different SAR prediction models for the C3T were defined and evaluated: one based on an anatomically derived exposed mass, and one using a fixed anatomical position located caudally to the RF coil to determine the exposed mass. After coil modeling and virtual human body simulation, the designed SAR prediction model was implemented on the C3T and verified with calorimetry and in vivo scan power monitoring. The fixed-demarcation exposed mass model was selected as appropriate exposed mass region to accurately estimate the SAR deposition in the patient on the C3T.
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影响因子：
3.3
作者：
Homann, H.;Boernert, P.;Graesslin, I.
通讯作者：
Graesslin, I.
影响因子：
3.5
作者：
In MH;Shu Y;Trzasko JD;Yarach U;Kang D;Gray EM;Huston J;Bernstein MA
通讯作者：
Bernstein MA
DOI：
10.1002/jmri.24152
发表时间：
2014-02
期刊：
Journal of magnetic resonance imaging : JMRI
影响因子：
--
作者：
Krishnamurthy N;Zhao T;Ibrahim TS
通讯作者：
Ibrahim TS
影响因子：
4.4
作者：
Collins, CM;Liu, WZ;Smith, MB
通讯作者：
Smith, MB
影响因子：
5.7
作者：
Fiedler, Thomas M.;Ladd, Mark E.;Bitz, Andreas K.
通讯作者：
Bitz, Andreas K.