Arterial Spin Labeling (ASL) is prone to a number of artifacts, which may affect its diagnostic accuracy. To avoid these pitfalls, possible effects on the ASL measurements should be identified. Perfusion asymmetry in the posterior cerebral artery (PCA) territory may be induced by the fetal-type PCA. Whenever a posterior left-right asymmetry is observed on the ASL, structural MR images should be taken into account to rule out cerebrovascular pathology mimickers such as unilateral fetal-type PCA.

中文翻译：

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胎儿来源的大脑后动脉对动脉旋转标记序列的潜在影响。

动脉自旋标记（ASL）容易产生许多伪影，这可能会影响其诊断准确性。为避免这些陷阱，应确定对ASL测量的可能影响。胎儿型PCA可能诱发大脑后动脉（PCA）区域的灌注不对称。每当在ASL上观察到左右后不对称性时，都应考虑结构性MR图像，以排除脑血管病理学隐喻，如单侧胎儿型PCA。