Performance evaluation of a 32-element head array with respect to the ultimate intrinsic SNR.
Performance evaluation of a 32-element head array with respect to the ultimate intrinsic SNR.
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DOI：
10.1002/nbm.1435
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发表时间：
2010-02
影响因子：
2.9
通讯作者：
Sodickson, Daniel K.
中科院分区：
文献类型：
--
作者：
Lattanzi, Riccardo;Grant, Aaron K.;Polimeni, Jonathan R.;Ohliger, Michael A.;Wiggins, Graham C.;Wald, Lawrence L.;Sodickson, Daniel K.
关键词：
RF探测器线圈设计的质量通常根据其与其他线圈配置的比较来判断。本文的目的是开发一种工具，用于评估射频线圈阵列的绝对性能。针对球面几何实现了一种计算最终固有信噪比的算法。在计算中建模的相同成像任务使用32元件头阵列进行实验再现。然后，针对与不同程度的并行成像相关的不同加速因子，基于实验测量的SNR与最终固有SNR的比率生成线圈性能图。在所有情况下，样本中心附近的相对性能最高（绝对SNR最低）。在未加速的情况下发现的最高性能和最大的85%，观察到与人类大脑中的值一致的电性能的幻影。性能几乎保持不变的2倍加速，但恶化在更高的加速因子，这表明需要更大的阵列有效的高加速并行成像。这里提出的方法可以作为一种工具，线圈设计的评估，以及一种工具，以指导开发的原始设计，可能开始接近最佳性能。
The quality of an RF detector coil design is commonly judged on how it compares with other coil configurations. The aim of this article is to develop a tool for evaluating the absolute performance of RF coil arrays. An algorithm to calculate the ultimate intrinsic signal-to-noise ratio (SNR) was implemented for a spherical geometry. The same imaging tasks modeled in the calculations were reproduced experimentally using a 32-element head array. Coil performance maps were then generated based on the ratio of experimentally measured SNR to the ultimate intrinsic SNR, for different acceleration factors associated with different degrees of parallel imaging. The relative performance in all cases was highest near the center of the samples (where the absolute SNR was lowest). The highest performance was found in the unaccelerated case and a maximum of 85% was observed with a phantom whose electrical properties are consistent with values in the human brain. The performance remained almost constant for 2-fold acceleration, but deteriorated at higher acceleration factors, suggesting that larger arrays are needed for effective highly-accelerated parallel imaging. The method proposed here can serve as a tool for the evaluation of coil designs, as well as a tool to guide the development of original designs which may begin to approach the optimal performance.
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影响因子：
3.3
作者：
Sodickson, DK;Manning, WJ
通讯作者：
Manning, WJ
影响因子：
3.3
作者：
de Zwart, JA;Ledden, PJ;Duyn, JH
通讯作者：
Duyn, JH
影响因子：
3.3
作者：
Griswold, MA;Jakob, PM;Haase, A
通讯作者：
Haase, A
影响因子：
2.2
作者：
Tropp, J
通讯作者：
Tropp, J
影响因子：
3.3
作者：
Wiesinger, F;Boesiger, P;Pruessmann, KP
通讯作者：
Pruessmann, KP