【摘要】 目的：研究大孔径CT自适应统计迭代重建(ASIR)对肺结节经皮穿刺中图像质量的影响。方法：选取2023年1月—7月于深圳市宝安区人民医院接受大孔径CT引导穿刺的肺结节患者20例。分别应用滤波反投影技术(FBP)和ASIR技术重建图像并评价两组图像质量。主观评价采用Likert 评分，客观评价对结节区噪声标准差(SD)、对比噪声比(CNR)和穿刺针针尖位置CT值等资料。结果：图像的主观评价均满足穿刺要求且一致性较好(Kappa值=0.740)。ASIR图像质量随着权重先增加后降低，权重为60%时最佳。和FBP相比，ASIR 60%的Likert评分更高，结节SD和CNR值比较，差异有统计学意义(P=0.004、0.043)。其他统计参数比较，差异均没有统计学意义(P>0.05)。结论：放疗用大孔径CT常规扫描不影响穿刺图像质量，ASIR 60%图像质量更优，可以用于引导肺结节经皮穿刺。更多还原

【Abstract】 Objective To study on the effect of adaptive statistical iterative reconstruction (ASIR) on the image quality in chest aspiration biopsy using large aperture CT.Methods Select 20 patients with pulmonary nodules who underwent large-aperture CT guided puncture at Shenzhen Baoan People’s Hospital from January 2023 to July 2023.Apply filtered backprojection (FBP) and ASIR techniques respectively to reconstruct images and evaluate the quality of the two sets of images.The Likert 5 score was used as subjective evaluation while the interesting characters including image noise standard deviation(SD),contrast-to-noise ratio (CNR),needle entry length and CT value behind the needle were recorded and statistically analyzed.Results All images meet the aspiration biopsy requirement.In ASIR,the imaging quality reached highest in 60% weight.Comparing with FBP,ASIR 60% image quality was better and there were significant differences in the SD and CNR of nodules (P=0.004,0.043).Conclusion ASIR 60% image quality reached the highest in this study,Large-aperture CT-guided lung puncture with FBP and ASIR could meet the clinical requirement.更多还原