一种具有数字预加重的磁共振成像梯度波形发生器

提出一种用于磁共振成像的高性能，高集成度基于PCI总线的数字预加重梯度波形发生器，它具有独立的X,Y,Z三通道预加重梯度波形输出，其主要特点在于此设计采用了现场可编程门阵列技术实现. 本文所述的预加重梯度发生器，其数字梯度预加重和数字逻辑模块全部集成在单片可编程芯片中，这样不但可以产生高性能的预加重梯度波形，而且可以简化磁共振成像仪的设计. 本文详细讨论了此梯度波形发生器的设计，最后给出了此设计的测试指标和实验结果. 

A Digital Preemphasis Gradient Waveform Generator for Magnetic Resonance Imaging

Based on the Peripheral Component Interconnect (PCI) bus of a personal computer, a highly integrated gradient waveform generator used for nuclear magnetic resonance and magnetic resonance imaging was developed. Three independent gradient waveform channels on a printed circuit board were used as the sources for X, Y and Z gradients. The main feature of the design is utilization of field programmable gate array technology, making the hardware structure simpler and more flexible. In addition, digital preemphasis function was integrated in the gradient waveform generator and implemented in the field programmable gate array.