目的：探讨茎突高分辨率CT扫描时改变螺距及准置器宽度对图像质量的影响。
Objective To discuss the influences of changing pitch and width of sets to image quality when scanning styloid process with multi-slice CT.
常规剂量扫描条件下，扫描层厚、重建间隔、螺距、结节大小、结节位置均可影响结节的检出。
By standard dose schemes, the slice thickness, reconstruction interval, pitch, nodule size and position all influence the defection of the lung nodules.
临床照片中，锥形伪影突出表现在边界明显的部位。结论：锥形伪影与螺距和被扫描物属性存在确定关系。
Conclusion: the cone artifact in ct image is related to such scanning parameters as pitch and the characters of the scanned objects.
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