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目的 利用64层CT对肺叶间裂的附属裂发生部位进行分类并评价附属裂出现的频率.方法 回顾分析64层CT扫描的2664例患者,除外影响肺叶间裂观察的患者,研究对象共847例.采用MPR技术重组3 mm冠状面和矢状面、7 mm横断面图像,观察分析肺叶间附属裂.结果 847例患者中,17.0%(144例)存在177个附属裂(右肺122个,左肺55个,其中右肺1例存在2种附属裂),34例两肺均存在附属裂.肺附属裂大部分不全,右肺仅有8.2%(10个)、左肺仅有3.6%(2个)为完全的附属裂.右下叶背段的附属裂最常见,占13.2%(112例),其次为左水平裂6.0%(51例),右下叶基底段间0.7%(6例),左下肺背段0.5%(4例)、奇裂0.4%(3例)、右肺跨叶的附属裂占0.1%(1例).结论 64层CT的MPR技术能够很好地显示肺叶间裂的附属裂,可为临床提供可靠、有价值的肺叶间裂影像资料.

Objective To classify the accessory fissures and assess the frequency of accessory fissures of the lung by 64-slice spiral CT (MSCT). Methods Of 2664 patients, 847 patients were included in this study excluding the patients with pulmonary parenchymal distortion, pleural disease or lobectomy. Allvolume raw data with a slice thickness of 0.6 mm were reformatted in sagittal and coronal orientations with 3 mm thickness and the accessory fissures were assessed. Results A total of 177 accessory fissures in 144 patients (17.0%) were detected. Most of the accessory fissures were incomplete except 10 fissures on the right lung (8.2%) and 2 fissures on the left lung (3.6%) were complete. The most common fissurewas the superior accessory fissure on the right low lobe (n = 112,13.2%) ,followed by the left minor fissure (n= 51,6.0%), the right inferior accessory fissure( n = 6,0. 7% ), the left superior accessory fissure ( n =4, 0.5%), the azygos fissure (n = 3,0.4%) and the accessory fissure on the right upper and middle lobe(n = 1,0.1%). Conclusion 64-slice CT is an efficient method to observe and classify the accessory fissures of the lung with MPR technique and can provide reliable and useful imaging information for the clinician.