基于PET/CT、HRCT特征的评分系统鉴别诊断孤立性肺部病变的临床研究

目的 探讨基于PET/CT、HRCT影像学特征的评分系统对孤立性肺部良恶性病变的诊断价值。方法 回顾性分析行PET/CT检查的孤立性占位性肺病变112例，其中良性病变44例，恶性病变68例。对孤立性肺病变的12项PET/CT及HRCT影像特征进行评估，初步建立量化分级系统，采用受试者工作特征（ROC）曲线分析良恶性病变的最佳诊断评分临界值。结果 PET/CT及HRCT预测孤立性肺部病变的指标包括年龄≥60岁（2分）、病灶大小≥1.0 cm（2分）、密度不均匀（2分）、边界清楚（1分）、SUV_max≥2.5（2分）、ΔSUV_max≥1.0（2分）、滞留指数≥15%（2分）、分叶征（3分）、毛刺征（3分）、胸膜牵拉征（3分）、空泡征（3分）。根据各项指标建立评分系统，随着评分增加，恶性率逐渐增高，通过ROC曲线得出12分为区分良、恶性病变的最佳临界点，灵敏度为92.6%，特异度为81.8%。结论 基于PET/CT、HRCT影像学特征的量化分级系统有助于鉴别孤立性肺部良恶性病变。

Clinical study on diagnosis of solitary pulmonary lesions by scoring system based on PET/CT and high-resolution computed tomography features

Objective To explore a quantitative scoring system based on PET/CT and high-resolution computed tomography(HRCT) characteristics for differentiating benign and malignant solitary pulmonary lesions. Methods A total of 112 patients with solitary pulmonary lesions detected by 18F-FDG PET/CT were enrolled and reviewed retrospectively. Of these cases, 44 were benign lesions and 68 were malignant. PET/CT and HRCT imaging features were recorded and evaluated. A quantitative scoring system was established. The best cut-off score was calculated by analysis of receiver operating characteristics(ROC) in differentiating benign and malignant lesions. Results The indicators of malignant solitary pulmonary lesions by PET/CT and HRCT included age≥60 years(2 points), diameter of the lesion≥1 cm(2 points), heterogeneous density(2 points), clear boundary(1 point), SUVmax≥2.5(2 points),ΔSUVmax≥1.0(2 points), retention index(RI)≥15%(2 points), lobular sign(3 points), spiculation sign (3 points), pleural traction sign(3 points), and vacuole sign(3 points). A quantitative scoring system was established according to risk factors. Moreover, score 12 was the best cut-off by ROC analysis in differentiating benign and malignant lesions. The sensitivity and specificity rates were 92.6% and 81.8%, respectively. Conclusion The quantitative scoring system based on PET/CT and HRCT features exhibited a good capacity for differentiating malignant lesions from benign solitary pulmonary lesions.