改进约束球面反卷积模型的脑灰质微结构成像

杨佳铖, 王远军

Improved Constrained Spherical Deconvolution for Microstructural Imaging of Brain Gray Matter

YANG Jiacheng, WANG Yuanjun

图5 使用BTPDE和MF方法仿真的dMRI信号之间的绝对误差和相对误差.(a)、(b)和(c)分别展示了在b值为500、1 500和2 500 s/mm2时，不同扩散时间下的绝对误差；(d)、(e)和(f)则对应展示了相同b值条件下的相对误差. 图中蓝线为（δ=2.5 ms，Δ=5 ms）时的误差，红线为（δ=10 ms，Δ=43 ms）时的误差，黄线为（δ=10 ms，Δ=433 ms）时的误差；图中纵轴表示误差的大小，横轴代表梯度方向；115个梯度方向均匀分布在整个球面上

Fig. 5 Absolute and relative errors between dMRI signals simulated using BTPDE and MF methods. (a), (b), and (c) show the absolute errors at different diffusion times for b values of 500, 1 500, and 2 500 s/mm2; (d), (e), and (f) correspondingly show the relative errors for the same b value condition. The blue line of the figure is the error at (δ=2.5 ms, Δ=5 ms), the red line is the error at (δ=10 ms, Δ=43 ms), and the yellow line is the error at (δ=10 ms, Δ=433 ms). The vertical axis of the figure represents the magnitude of the error, the horizontal axis represents the gradient directions；115 gradient directions uniformly distributed over the entire sphere