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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In the system of measuring Angle of phase interferometer, it is considered that the impact brought by baseline obliquity on phase can be eliminated by equivalent baseline from geometric projection.