MRI谱仪中的数字解调及滤波方法研究  

Algorithm of Digital Demodulation and Filtering in MRI Spectrometers

作　　者：潘文宇[1] 刘正敏[1] 周荷琴[1] 

机构地区：[1]中国科学技术大学自动化系,安徽合肥230027

出　　处：《中国医疗器械杂志》2008年第4期271-274,共4页Chinese Journal of Medical Instrumentation

摘　　要：针对数字化MRI谱仪中射频接收器,提出了一种磁共振信号的数字解调和滤波的设计方案。首先对经过A/D转换后的数字MR信号进行正交解调,然后依次采用CIC滤波器组、半带滤波器组和线性相位FIR滤波器进行多级滤波和数据抽取,得到了满意的处理速度和滤波效果,并显著减少了数据量。通过在永磁型MRI系统上的实验,验证了该方案的有效性和实用性。In the design of RF receiver of the digital MRI spectrometer console, a digital demodulation and filtering algorithm is presented in this thesis. The MR signals are firstly converted to digital signals by the A/D converter, and then quadrature-demodulated from high frequency carrier wave. The CIC filter, half-band filter and linear phase FIR filter are designed to process the cascaded filtering and decimation of the demodulated signals. This method achieves a satisfying processing speed and filtering effect, and also reduces the data size obviously. The experiment based on the permanent magnetism resonance imaging system proves its effectiveness and practicability.

关 键 词：数字化谱仪 射频接收器 正交解调 多级滤波 数据抽取 

分 类 号：TN713[电子电信—电路与系统] TN76