多排螺旋CT不同剂量心脏扫描参数对图像质量的影响

目的：探讨多排螺旋CT心脏扫描在不同辐射剂量情况下对图像质量的影响。方法：随机抽取心脏扫描患者扫描图像资料100份,按照图像扫描时所用不同辐射剂量分为高剂量组（2.00±0.76）m Sv、中等剂量组（1.50±0.35）m Sv和低剂量组（0.75±0.13）m Sv,比较3组的图像质量差异,并对不同剂量心脏扫描参数对图像质量的影响做线性多元回归分析。结果：1低剂量组相比于其他两种辐射剂量,质量差异有统计学意义（P〈0.05）,而高剂量组和中等剂量组相比,两组图像质量无明显差异;2不同剂量条件下扫描参数的设置与图像质量与CT设置的准直、层厚及重建方法等密切相关。结论：64层螺旋CT的心脏扫描中相同参数条件下,辐射剂量高低对图像质量有影响,而降低受检者的辐射剂量可通过优化扫描条件获得,如优化重建方法和扩大显示视野等即可满足高质量影像诊断要求。

Different doses cardiac scan parameters influence on image quality of multislice spiral CT

Objective： to evaluate the different doses cardiac scan parameters influence on image quality of Multislice spiral CT. Methods：random collected 100 samplings that were the patients with cardiac scan images, indived them into the high dose group, midle dose group and the row dose group, based on the different doses of radiation, and then comparad the image quality. and analysed the influence of different doses of heart scan parameters on image quality through the linear multivariate regression. Results：1）Low dose group compared with the other two kinds of radiation dose, the quality of the difference was statistically significant （P〈0.05）, while the high dose group and middle dose group, compared two groups of image quality without obvious difference;2）under the condition of different doses of scanning parameter setting and image quality and CT set of collimation, layer thickness and reconstruction methods are closely related. Conclusion：64 layer CT scanning for the heart of the spiral, under the same parameter conditions, the radiation dose level have an impact on image quality, and if wanted to improve the requirements of imaging diagnosis, it could be reduce the radiation dose using, or optimization reconstruction method, expand the display field and so on.