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.
采用小的螺距，和较大的螺距值来扫描可以提高CT图像质量并减少病人所接受的辐射剂量。
By adopting small pich and bigger pich value, the quality of CT images could be improved and the dose of radiation that patients take in would be reduced.
目的评价双螺旋CT血管造影（SCTA）不同扫描层厚和螺距对门静脉成像质量的影响。
Objective To optimize parameters with double spiral computed tomographic angiography(SCTA) for visualization of portal veins.
目的评价双螺旋CT血管造影（SCTA）不同扫描层厚和螺距对门静脉成像质量的影响。
Objective To optimize parameters with double spiral computed tomographic angiography(SCTA) for visualization of portal veins.
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