具有独立延时功能的脉冲序列发生器  

A Pulse Programmer with Independent Delay Capability

作　　者：胡坤[1] 宁瑞鹏[1] HU Kun;NING Rui-peng(Institute of Physics and Materials Science & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062,China)

机构地区：[1]华东师范大学物理与材料科学学院,上海市磁共振重点实验室,上海200062

出　　处：《波谱学杂志》2017年第3期347-356,共10页Chinese Journal of Magnetic Resonance

基　　金：上海市自然科学基金资助项目(14ZR1411300);华东师范大学研究生科研创新实践基金资助项目(40600-511232-16203/013/034/001)

摘　　要：在磁共振成像(Magnetic Resonance Imaging,MRI)系统中,谱仪是中心控制单元,其脉冲序列发生器输出的多通道指令分别控制各硬件部件协调工作,从而采集数据并重建图像,各硬件部件之间的相对延时会影响磁共振图像的质量或导致系统无法采集到图像.为了解决这一问题,本文设计了每个输出通道均具有可调延时功能的脉冲序列发生器,每一路通道的最大延时值为819?s,延时步进值为50 ns,可实现对相对延时的精确补偿.由于延时功能是通过在脉冲序列发生器每个输出通道上添加独立延时电路实现的,因此具有结构简单,灵活性高的优点.Spectrometer is a key control unit in magnetic resonance imaging(MRI)systems.Pulse programmer of thespectrometer outputs multi-channel instructions to control each hardware component separately,and to coordinate work,collect data,and reconstruct image.Relative time delay among the hardware components may disable the system,or affectthe quality of the images acquired.This work designed a pulse programmer whose output channels all boasted adjustabletime delay capability.The maximal time delay for each channel was819?s,and the step time delay was50ns.As such,accurate compensation to relative time delay could be achieved.By adding independent delay circuits on every outputchannel of the pulse programmer,adjustable time delay capability was achieved.The pulse programmer proposed has theadvantages of simple structure and high flexibility.

关 键 词：磁共振成像(MRI) 脉冲序列发生器 相对延时 独立延时功能 

分 类 号：O482.53[理学—固体物理]