全脑同时神经黑色素敏感与定量磁化率成像
陈梦颖,武玉朋,逄奇凡,钟昊东,李改英,李建奇*(
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Simultaneously Neuromelanin-sensitive Imaging and Quantitative Susceptibility Mapping in the Whole Brain
CHEN Mengying,WU Yupeng,PANG Qifan,ZHONG Haodong,LI Gaiying,LI Jianqi*()
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图1. 三维磁化转移梯度回波（3D MT-GRE）脉冲序列时序图.脉冲序列由MT模块和常规3D GRE成像模块组成.MT模块中，在高斯射频脉冲（绿色）后施加扰相梯度（黑色）以破坏剩余横向磁化矢量.GRE模块中，所有回波采集结束后，施加一个强的扰相梯度（黑色）以消除剩余横向磁化矢量.α：GRE成像翻转角；TR：重复时间；TE1：第一个回波的回波时间；ΔTE：回波间隔时间
Fig. 1. A schematic diagram of the 3D MT-GRE sequence. The sequence consists of an MT module and a 3D GRE imaging module. In the MT module, a spoiler gradient (black) is added following the Gaussian RF pulse (green) to spoil residual transverse magnetization. In the GRE module, a strong spoiler gradient (black) is applied to eliminate the residual transverse magnetization after all echoes are collected. α, flip angle for GRE imaging module; TR, repetition time; TE1, the first echo time; ΔTE, echo spacing
