医用MRI系统快速获取梯度回波脉冲序列开发

The Development of RAGE Pulse Sequence with Clinical MRI Scanner

目的:探讨在i_Open 0.36T医用磁共振成像(MRI)系统上开发快速获取梯度回波脉冲序列(RAGE)的可行性与实现方法。方法:pascal语言编辑源程序,可调参数控制激发层数,相位编码时序,激发脉冲相位循环,数据采集次数,各段梯度脉冲开关时序等,编排k空间数据记录方式,满足快速傅立叶变换重建需要。编译源程序,调试图像。结果:在256×256采集矩阵的情况下,单层面成像时间最小值4s,所获图像分辨率、信噪比等指标能满足临床诊断需要。结论:利用该方法设计快速获取梯度回波脉冲序列是可行的。

Objective： To implement rapid acquisition gradient echo（RAGE） pulse sequence in clinical MRI scaner. Methods： Pascal language is engaged to edit source code. Number of slice excited,order of phase encoded,phase recycle of RF pulse, NEX,on/off of the gradients,and so on are all controlled by sequence parameters. SIxNe^xN^o data of 32 betys were allocated to restore the k space. Source code of sequence was compiled with executable file and is loaded to RINMR software. Image of human brain are acquired.The experiment has been conducted on 0.36T permanent MRI system. Results： In the case of 256× 256 matrix acquisition,time of single slice is 4 seconds.The resolution and SNR of the image are all adquately satisfy the clinical application.