[Spiral CT. Better resolution by increased pitch?].

Aktuelle Radiologie Pub Date : 1998-11-01
G Rockstroh
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Abstract

The longitudinal resolution of spiral CT has been investigated in dependence on table increment and beam collimation by use of a phantom. The results show clearly that the pitch (ratio of table increment per tube rotation to beam collimation) alone does not allow one to draw any conclusions about the resolution. Thus, a large pitch can yield a better resolution than the pitch of 1. The individual parameters table increment and beam collimation are more relevant with regard to the resolution than the rate of pitch. An alteration of the pitch can be achieved in two different ways. An increase of the pitch by a decreased beam collimation improves the resolution. In contrast, an increase of the pitch by an increased table increment decreases the resolution. A good spatial resolution of objects with high contrast (bone, lung, enhanced vessels) needs a narrow beam collimation, even if a pitch as high as 2 is necessary for a given scanning coverage. A large pitch does not cause gaps in the data set. Moreover, the patient's radiation dose decreases.

(螺旋CT。提高音高能提高分辨率?
本文研究了螺旋CT纵向分辨率与表增量和光束准直的关系。结果清楚地表明,节距(每管旋转的表增量与光束准直的比率)单独不能让人们得出任何关于分辨率的结论。因此,较大的音高可以产生比1的音高更好的分辨率。单独的参数表增量和光束准直比螺距率对分辨率的影响更大。音高的改变可以通过两种不同的方式实现。通过减少光束准直来增加螺距可以提高分辨率。相反,由于表增量增加而增加的螺距会降低分辨率。高对比度对象(骨、肺、增强血管)的良好空间分辨率需要窄光束准直,即使在给定的扫描覆盖范围内需要高达2的间距。较大的间距不会在数据集中产生间隙。此外,患者的辐射剂量降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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