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本文通过厚模型的测试和42例病人图像的分析,认为双螺旋CT图像纵向分辨率易受层厚敏感曲线(SSP)的影响。而层厚、螺距和重建算法等是直接影响SSP的因素。实际应用中恰当地选用这几种因素可改善双螺旋CT图像纵向分辨率。
In this paper, through the thick model test and the analysis of 42 patient images, it is considered that the longitudinal resolution of double helical CT images is susceptible to the layer thickness sensitive curve (SSP). The layer thickness, pitch and reconstruction algorithm are directly affect the SSP factor. Appropriate use of these factors in practical applications can improve the longitudinal resolution of double helical CT images.