| 磁共振成像的正交线圈数字合成方法研究 |
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| 引用本文： | 宁瑞鹏,李鲠颖. 磁共振成像的正交线圈数字合成方法研究[J]. 波谱学杂志, 2009, 26(4): 476-483 |
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| 作者姓名： | 宁瑞鹏 李鲠颖 |
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| 作者单位： | 上海市磁共振重点实验室，华东师范大学 物理系，上海 200062 |
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| 基金项目： | 上海市科委资助项目，上海市磁共振重点实验室开放课题 |
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| 摘 要： | 当采用正交线圈来提高接收通道的性能时，合成方法对整体效果有很大的影响. 由于在一般情况下正交线圈的2个线圈的信噪比存在不平衡，故需要采用加权合成的方法来优化合成图像的信噪比. 在现有的模拟合成方法中，加权系数是固定的，不能根据每次扫描的实际情况来确定最优的参数，因此无法得到最佳的合成效果. 该文提出一种简单的磁共振正交线圈成像的数字合成方法，它采用2个完全独立的接收通道来采集磁共振信号，根据两通道信号的特性来动态地确定I/Q线圈的加权因子，最后进行加权合成.
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| 关 键 词： | 磁共振成像（MRI） 接收通道 正交线圈 数字合成 |
| 收稿时间： | 2009-03-16 |
| 修稿时间： | 2009-04-01 |
Combination of Signals from Quadrature MRI Receiver Coils |
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| NING Rui-Peng,LI Geng-Ying. Combination of Signals from Quadrature MRI Receiver Coils[J]. Chinese Journal of Magnetic Resonance, 2009, 26(4): 476-483 |
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| Authors: | NING Rui-Peng LI Geng-Ying |
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| Affiliation: | Shanghai Key Laboratory of Magnetic Resonance, Department of Physics, East China Normal University, Shanghai 200062, China |
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| Abstract: | Quadrature receiver coils are often used in magnetic resonance imaging. However, the imbalance of the detection sensitivity between the I-channel and the Q-channel in these coils can affect the overall signal to noise ratio (SNR) of the images obtained. In order to solve this imbalance problem, we propose a digital method for combining the signals from the two channels of the quadrature coils, in which the weighted coefficients of the I and Q channels are determined dynamically in the K-space. It was demonstrated that optimal SNR can be obtained with the present method. |
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| Keywords: | MRI receiving channel quadrature coil digital combination |
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