近来常采用脑CT扫描，显示一蝶鞍内低密度的蛛网膜疝囊影，可有助鉴别。
Recently, CT scan is used more often, demonstrating a tow-density area within the sella.
在数字减影血管造影中，常要用配准技术来消除因病人运动而形成的减影图像中的运动伪影。
In digital subtraction angiography, registration techniques were frequently used to reduce motion artifact in subtracted image because of patient motion.
条状伪影最 常发生在头骨和太阳穴的多骨 结构。
Streak-like occur most frequently in the bony structures at the base of the skull and the petrous bone region.
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