磁共振梯度电源系统设计

Design of MRI's gradient power system

磁共振成像(MRI)是目前普遍使用的一种断层成像技术,虽然出现时间不长,但发展很快。磁共振设备的核心技术长期被国外垄断,目前主流的磁共振设备均由国外品牌占据,价格高昂。因此,开展这方面的研究刻不容缓。本文在分析磁共振设备的原理、组成,特别是梯度系统的作用和结构的基础上,设计了有别于传统的磁共振梯度电源系统,以单片ARM微控制器和脉宽调制技术(PWM)来构建的梯度电源,并将梯度波形发生器和梯度放大器的功能集成在内,由主计算机和脉冲序列直接控制同步,以实现系统的简略和高效。

MRI is a tomographic imaging technique widely used at present time which is not long,but it develops very quickly. The core technology of magnetic resonance equipment long- term is dominated by foreign monopoly. The magnetic resonance equipment mainstream is occupied by foreign brands,but the price is high. Therefore,the research in this field is undoubtedly necessary. This paper,based on the analysis of the principle of magnetic resonance equipment components,especially the basic structure and function of the gradient system,designs the magnetic resonance gradient power system which is different from the traditional one. The paper also analysis the gradient power system composed by single chip microcontroller ARM and by the pulse width modulation( PWM),embedded with the gradient waveform generator and the gradient amplifier. And it Synchronized by the host computer and the pulse sequence control,in order to realize the system simple and efficient.