扩散加权磁共振波谱采集策略优化：门控及循环模式影响

文玉林, 李改英, 武玉朋, 李建奇

Optimization of DW-MRS Acquisition Protocol: The Impact of Gating and Cycling Modes

WEN Yulin, LI Gaiying, WU Yupeng, LI Jianqi

图1 DW-PRESS序列图. RF表示射频脉冲；GX、GY和GZ分别表示三个正交方向的梯度. 在本研究中，X、Y和Z分别对应受试者的左右、前后和头脚方向. 蓝色表示定位梯度；黑色表示扰相梯度；绿色表示扩散梯度. TE为回波时间，等于τ1+τ2的两倍；ε表示扩散梯度施加时长；Δ为扩散梯度对的间隔时间（即扩散时间），时长为TE的一半

Fig. 1 Sequence diagram of diffusion-weighted point resolved spectroscopy. RF denotes the radiofrequency pulse, while GX, GY, and GZ represent the gradients along the left-right, anterior-posterior, and head-foot directions, respectively. The blue color indicates the localization gradient, black represents the spoiling gradient, and green denotes the diffusion gradient. The echo time (TE) is defined as twice the sum of τ 1 and τ 2. ε denotes the duration of the applied diffusion gradient, while Δ represents the interval between the diffusion gradient pairs (i.e., the diffusion time), which is half the duration of TE