Huang Yiman, Qu Shuxian, Xie Yushu, Wang Hanlei, Zhang Xinlin, Zhang Xiaotong
IEEE Trans Biomed Eng. 2025 Jul;72(7):2095-2104. doi: 10.1109/TBME.2025.3534839.
For low-field magnetic resonance imaging (MRI) in unshielded environment, existing methods have been proposed to eliminate electromagnetic interference (EMI) noise in each single radio-frequency (RF) receive coil. In the present study, we propose to use the EMI information from multiple MRI receive coils collectively in EMI denoising.
The proposed method leverages the information of inter-channel correlation, including EMI detectors and RF receive coils to remove EMI noise. Calibration signals from both EMI detectors and RF receivers are concatenated to determine a de-correlation matrix, which is then used to denoise MRI signals.
Saline phantom and in vivo experiments demonstrated the efficacy of the proposed method in EMI elimination, showing that the proposed method outperformed advanced EMI elimination methods with up to 16.34% improvement in EMI noise removal percentage (NRP) and 1.58dB improvement in signal-to-noise ratio (SNR), along with reduced computational time.
The proposed method effectively removes EMI noise and shows improved performance by using information from all receive coils.
This method allows for the design of multi-receive coils for low-field MRI such as phased-arrays, which have the potential to enhance the performance in noise removal and improve the SNR in MRI signal acquisition.
对于在非屏蔽环境中的低场磁共振成像（MRI），已经提出了现有方法来消除每个单个射频（RF）接收线圈中的电磁干扰（EMI）噪声。在本研究中，我们建议在EMI去噪中共同使用来自多个MRI接收线圈的EMI信息。
所提出的方法利用通道间相关性信息，包括EMI探测器和RF接收线圈来去除EMI噪声。来自EMI探测器和RF接收器的校准信号被连接起来以确定去相关矩阵，然后该矩阵用于对MRI信号进行去噪。
盐水体模和体内实验证明了所提出方法在消除EMI方面的有效性，表明所提出的方法优于先进的EMI消除方法，在EMI噪声去除率（NRP）方面提高了高达16.34%，在信噪比（SNR）方面提高了1.58dB，同时减少了计算时间。
所提出的方法通过使用来自所有接收线圈的信息有效地去除了EMI噪声并显示出改进的性能。
该方法允许设计用于低场MRI的多接收线圈，如相控阵，其有可能提高噪声去除性能并改善MRI信号采集中的SNR。
