Abstract
背景与目的肺癌淋巴结转移是重要的生存预后因素,准确的纵隔淋巴结分期可以使患者最大程度地受益于手术。本研究旨在探讨宝石能谱计算机断层扫描(computed tomography, CT)定量参数在术前诊断非小细胞肺癌(non-small cell lung cancer, NSCLC)患者淋巴结转移的价值。方法收集48例NSCLC患者,连续进行宝石能谱CT成像(gemstone spectral imaging, GSI)模式肺增强扫描和手术治疗。重建GSI数据,测量淋巴结的大小、动脉期和静脉期的CT值、能谱曲线的斜率、标准化碘浓度以及水浓度。采用独立样本的t检验,并进行受试者工作特征曲线(receiver operating characteristic, ROC)分析,确定诊断的最佳阈值及效能。结果转移性淋巴结与非转移性淋巴结短轴直径、动脉期和静脉期的CT值、能谱曲线的斜率、标准化碘浓度均有统计学差异。当确定动脉期能谱曲线斜率的最佳临界值为2.75,其诊断的敏感性、特异性及总体的准确性分别为88.2%、88.4%、87.0%。结论能谱CT的GSI模式定量参数较传统CT在术前诊断转移性淋巴结方面有更高的诊断效能。
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