多层CT扫描层厚、重建参数的选择对容积重建图像质量的影响  

The effects of slice thickness and reconstructive parameters on VR image quality in multi-slice CT

作　　者：高振龙[1] 王强[1] 刘彩霞 

机构地区：[1]中国医科大学附属第一医院放射科,沈阳110001 [2]辽宁省大石桥市中心医院放射科

出　　处：《中华放射医学与防护杂志》2005年第6期572-574,共3页Chinese Journal of Radiological Medicine and Protection

摘　　要：目的探讨多层CT扫描层厚、重建层厚、重建间隔的选择对CT容积重建图像质量的影响,选择适宜多层CT容积重建扫描的扫描层厚、重建层厚、重建间隔的最佳匹配。方法应用多层螺旋CT以不同扫描层厚对模拟病变的橡胶恐龙模型进行扫描,以不同的重建层厚和重建间隔重建出容积重建图像。由5位放射医生采用全盲法对重建的容积重建图像进行评价,以析因设计的方差分析对各图像的评分进行分析。结果不同的扫描层厚、重建层厚、重建间隔匹配重建出的容积重建图像质量评分均数不同。扫描层厚V1、重建层厚V2、重建间隔V3对重建的VR图像质量影响程度存在差异(P<0.05)。系数分别为V1=1413.033V2=563.733V3=390.533、且三者因素具有交互作用。扫描层厚、重建层厚、重建间隔越小容积重建图像质量评分越高,在扫描层厚2.0mm,重建层厚2.0mm时,重建间隔为扫描层厚的1/2、1/3、1/4容积重建图像的质量没有明显的差异。结论多层CT容积重建图像扫描参数扫描层厚应选择2.0mm,重建层厚2.0mm,重建间隔1/2为最佳。图像质量主要有扫描层厚决定。Objective To explore the effects of slice thickness, reconstructive thickness and reconstructive interval on VR image quality in multi-slice CT, in order to select the best slice thickness and reconstructive parameters for the imaging. Methods Multi-slice CT scan was applied on a rubber dinosaur model with different slice thickness. VR images were reconstructed with different reconstructive thickness and reconstructive interval. Five radiologists were invited to evaluate the quality of the images without knowing anything about the parameters. Results The slice thickness, reconstructive thickness and reconstructive interval did have effects on VR image quality and the effective degree was different. The effective coefficients were V1 = 1413.033, V2 = 563.733, V3 = 390.533, respectively. The parameters interacted with the others （P 〈0.05）. The smaller of those parameters, the better of the image quality. With a small slice thickness and a reconstructive slice equal to slice thickness, the image quality had no obvious difference when the reconstructive interval was 1/2, 1/3, 1/4 of the slice thickness. Conclusion A relative small scan slice thickness, a reconstructive slice equal to slice thickness and a reconstructive interval 1/2 of the slice thickness should be sclected for the best VR image quality. The image quality depends mostly on the slice thickness.

关 键 词：扫描层厚 重建层厚 重建间隔 图像质量 

分 类 号：R814.42[医药卫生—影像医学与核医学] R814.3[医药卫生—放射医学]