Objective To discuss the influence of changing the Angle of cranial ct scan baseline on the artifacts of brain stem in posterior fossa.

目的：探讨调整颅脑CT扫描基线的角度对后颅窝脑干伪影严重程度的影响。

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OML. as baseline of CT scan, include cephalad for skull base, and caudad for nasopharynx and cervical.

CT扫描以oml为基线向上扫描至颅底，向下扫描包括鼻咽及颈部。

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On scan days, baseline scans were followed by intravenous administration of nicotine at a dose equivalent to the nicotine delivered by 1.5 cigarettes.

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