波谱学杂志 ›› 2009, Vol. 26 ›› Issue (4): 476-483.

• 4 • 上一篇    下一篇

磁共振成像的正交线圈数字合成方法研究

  

  1. 上海市磁共振重点实验室,华东师范大学 物理系,上海 200062
  • 收稿日期:2009-03-16 修回日期:2009-04-01 出版日期:2009-12-05 发布日期:2009-12-05
  • 基金资助:

    上海市科委资助项目 (07DZ22937,  08DZ1900702); 上海市磁共振重点实验室开放课题 (071221).

Combination of Signals from Quadrature MRI Receiver Coils

  1. Shanghai Key Laboratory of  Magnetic Resonance, Department of Physics, East China Normal University, Shanghai 200062, China
  • Received:2009-03-16 Revised:2009-04-01 Online:2009-12-05 Published:2009-12-05
  • Supported by:

    上海市科委资助项目 (07DZ22937,  08DZ1900702); 上海市磁共振重点实验室开放课题 (071221).

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.

关键词: 磁共振成像(MRI), 接收通道,  , 正交线圈, 数字合成

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.

Key words: MRI, receiving channel, quadrature coil, digital combination

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