低剂量256排螺旋CT肺灌注扫描的初步研究

Preliminary study on pulmonary perfusion scan with low dose of 256 row spiral CT

目的探讨将idose4迭代重建技术用于肺部低剂量灌注成像的可行性。方法选取26例接受胸部CT灌注扫描的患者，随机分为A组（100kVp，200mAs）和B组（100kVp，lOOmAs），分别采用idose4技术和FBP进行重建，记录各组的噪声、信噪比（signal—noise-ratio，SNR）、对比噪声比（apparentcontrast—tO—noiseratio，CNR）和有效剂量（effectivedose，ED）。按1～3分评价各组总体图像质量，并对2组结果进行比较。结果比较同一个患者的FBP和idose图像，idoSe技术明显降低了图像的噪声，提高了图像的SNR、CNR。B组idose后的图像噪声、SNR、CNR与A组FBP图像比较差异均无统计学意义（P〉O．05）。B组idose后的图像总体质量与A组FBP重建图像质量差异无统计学意义（P〉0．05）。结论运用迭代重建技术进行低剂量肺部CT灌注扫描可获得满足诊断要求的图像。

Objective To explore the feasibility of idose4 iterative reconstruction technique for the low dose perfusion im aging of lung. Methods 26 patients underwent chest CT scan were randomly divided into group A （100 kVp, 200 mAs） and group 13 （100 kVp, 100 mAs）, respectively, idose4 and FBP reconstruction were used to them, then, the noise, SNR （signal-noise-ratio）, CNR（apparent contrast-to-noise ratio）, and ED （effective dose） were recorded. The overall image quality was evaluated according to 1-3 score, and the results of 2 groups were compared. Results One patient＇s FBP and idose images were compared, idose technology significantly reducesd the image noise, increased the image SNR, CNR. There were no significant differences among the noise, SNR, CNR of group t3 idose image and group A FBP image （ P 〈0.05）. No statistical significance in overall image quality was found in reconstructed image quality between group 13 after idose and group A with F13P （ P 〈0.05）. Conclusion The iterative reconstruction technique of low dose CT lung perfu sion scan can meet the requirements of image diagnosis.