256层低剂量CT对细支气管肺泡癌的诊断价值

目的回顾性分析细支气管肺泡癌的低剂量CT表现,旨在提高细支气管肺泡癌的诊断水平。方法收集经手术病理证实为BAC病例31例,分析其低剂量CT上的表现。评价指标包括:病灶形态、边缘、内部密度等特征以及有无淋巴结肿大等;同时记录单次扫描的辐射剂量,并对图像质量进行主观评分。结果所有病灶均表现为磨玻璃密度(GGO)结节,96.7%边界清晰,分叶征、毛刺征及空泡征的发生率分别为93.5%、57%及54.8%,均无肺门纵隔淋巴结转移。低剂量CT的平均辐射剂量为(1.29±0.16)m Sv,图像质量均能满足临床诊断要求。结论 BAC具有特征性的CT表现;低剂量CT在保证图像质量的前提下,有效降低辐射剂量,对BAC的诊断具有重要价值。

Diagnostic Value of Low Dose CT in BAC

Objective To develop the diagnostic level of bronchioloalveolar carcinoma (BAC) by analyzing low dose CT presentations of BAC. Methods 31 cases of BAC confirmed by operation and pathology were retrospectively analyzed. Evaluated findings included the characteristics of lesions morphous, contours and density, lymphadenopathy were also assessed. Results All of the cases presented GGO nodules. 96.7% of them showed well-defined margin. The rate of lobulated shape, spicule sign and gas-containing space were 93.5%, 57%, 54.8%, respectively and lymphadenopathy in none of these BAC. The image quality of low dose CT were acceptable in the clinical diagnosis. The average ED was (1.29±0.16)mSv. Conclusion BAC had CT features with characteristic. Low dose CT could maintain or improve image quality on chest CT while reducing radiation dose effectively, and had great value in diagnosis of BAC.