Fast T2-weighted imaging is a commonly used diagnostic sequence for fetal MR. Because of the limitations of fetal development, the imaging effect of T1 nervous system imaging is difficult to achieve like the post-natal image effect. The 3D StarVIBE sequence is used as a new sequence under 3T MR, using a radial K-space filling, not sensitive to motion, can be applied to the fetal nervous system examination. Recent reports suggest that the TurboFLASH(TFL) sequence with an optimized TI time of 2500 ms is used as an advantage of excellent contrast and overcoming motion artifacts in 2D gradient echo sequences. Therefore, this study will use the 3D StarVIBE sequence and the TFL sequence as a reference to judge its imaging effect.
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