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European Radiology:计算机辅助诊断在肺癌CT筛查中的Lung-RADS分类应用

2022-01-15 shaosai MedSci原创

现阶段,低剂量CT进行肺癌筛查已越来越多的被临床所接受,并广泛应用于临床实践中。为规范肺结节的分类及描述,临床上引入了肺部影像报告和数据系统(Lung-RADS)以协助影像科医生对肺结节的判读。

现阶段低剂量CT进行肺癌筛查已越来越多的被临床所接受并广泛应用于临床实践中为规范肺结节的分类及描述临床上引入了肺部影像报告和数据系统(Lung-RADS)以协助影像科医生对肺结节的判读Lung-RADS分类主要由结节大小、结节类型和生长情况决定,每个评估方面会产生阅读者之间的差异性。前的一项研究发现,低剂量CT上结节类型的成对观察者间一致性只能达到中等的(平均Cohen's kappa,0.51)。考虑到每个分类等级的大小标准边界十分严格,特别是在第3类,Lung-RADS分类也可能受制于读卡器之间的变异而产生误差

为了减少阅读者之间的差异和判析上的不同,可以使用自动分割工具对肺结节进行Lung-RADS分类。医学影像深度学习应用的最新进展超越了简单的结节检测,实现了结节的自动分割、分类和测量,并对其恶性风险进行评估这种系统被称为计算机辅助诊断(CAD)。

近日,发表在European Radiology杂志的一项研究评估CAD在肺部RADS分类中阅读者间一致性的影响为肺结节的自动检测及风险评估提供了保障为提高影像判析的一致性提供了参考依据

从国家肺癌筛查试验中随机抽取了200张涵盖所有肺部Lung-RADS类别的基线CT扫描。五位放射科医生独立审查了CT图像,并分配了无CAD和有CAD的Lung-RADS类别。CAD系统显示了最多五个最具有风险优势的结节的测量结果和预测的Lung-RADS类别。使用多因素Fleiss κ统计分析了阅读者之间的一致性。 

五位读者报告了139-151个无CAD的阴性筛查结果和126-142个有CAD的结果。在有CAD的情况下,读者倾向于将Lung-RADS类别上移(平均12.3%)而不是下移(平均4.4%)在没有CAD的情况下,五位读者对肺部RADS分类的意见一致(Fleiss kappa,0.60[95%置信区间,0.57,0.63]),而在有CAD的情况下,意见一致程度有很大程度提高(Fleiss kappa,0.65[95% CI,0.63,0.68])。分歧的主要原因是在无CAD和有CAD的阅读环节中分配不同的风险主导结节(54.2% [201/371] vs. 63.6% [232/365])。使用CAD后,结节大小测量的分歧比例从5.1%(102/2000)降至3.1%(62/2000)(P < 0.001)。在31个肺癌阳性病例中,应用CAD后,读者对之间的实质性差异(1/2类与4A/B类)降低(集合敏感性,85.2%与91.6%;P = 0.004)。 

 

 a, b 轴和冠状CT图像显示左上叶约18.8毫米的纤维结节。在第1次评估中,只有读者4选择了这个病变作为风险主导的结节,并将其归为肺部RADS 4B类。读者1和2选择其他小结节为风险主导结节(c,d),读者3和5没有选择任何结节。由于CAD选择了与读者4相同的病变,读者1和5遵循CAD的结果。然而,即使有了CAD的标记,读者2也选择了与1次评估相同的结节,而读者3仍然没有选择任何结节作为风险主导的结节。根据这些结果,我们推测一些读者认为这种纤维结节不构成 "结节",尽管有一位读者在没有CAD结果的情况下将这种病变视为结节。CAD:计算机辅助诊断;Lung-RADS肺部成像报告和数据系统

综上所述,CAD的应用表明在Lung-RADS类别中,阅读者之间的一致性有所提高,同时在肺癌阳性病例中显示出测量变异性减少并可进一步提高临床对肺结节诊治的规范化程度

原文出处:

Sohee Park,Hyunho Park,Sang Min Lee,et al.Application of computer-aided diagnosis for Lung-RADS categorization in CT screening for lung cancer: effect on inter-reader agreement

.DOI:10.1007/s00330-021-08202-3

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    2022-09-11 feather89
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    2022-12-03 江川靖瑶
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