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为应对高场强磁共振成像时产生的电磁干扰,提出了一种磁共振兼容的心电采集和处理系统的设计方案。基于集成电路模拟前端和微控制器的采集方案极大地减小了系统回路面积,从而有效地减小了梯度磁场的干扰。为避免使用金属导线,采用碳纤维设计心电导联线并且设计了一种串口信号的光传输方案,心电数据通过光纤传送到控制室的PC进行实时处理。心电信号经小波滤波后输出的参考信号能够稳定地检测出R波。1.5T磁共振成像环境下的测试表明,该系统可用于心率监护和心电门控成像。
In order to cope with the electromagnetic interference generated in high-field MRI, a design scheme of magnetic resonance-compatible ECG acquisition and processing system is proposed. The acquisition scheme based on the integrated circuit analog front end and the microcontroller greatly reduces the system loop area, thereby effectively reducing the interference of the gradient magnetic field. In order to avoid the use of metal wire, carbon fiber is used to design the ECG lead wire and a serial optical signal transmission scheme is designed. The ECG data is transmitted to PC in the control room through optical fiber for real-time processing. ECG signal output by the wavelet filter the reference signal can be detected stably R wave. Tests in a 1.5T MRI environment show that the system can be used for heart rate monitoring and ECG gated imaging.