目的：在薄层正常肺CT及后处理图像上对叶间裂的影像解剖进行观察分析。方法：回顾性分析333例正常或基本正常肺CT，在横断位CT及多平面重组冠状位、矢状位CT及最大密度投影CT上观察叶间裂及不完整叶间裂的形态表现，对不完整叶间裂进行分型并确定缺失部位。统计分析应用SPSS 17.0。结果：三种叶间裂均完整的病例仅占20.72%。不完整叶间裂包括42.94%左斜裂，38.74%右斜裂及56.46%水平裂。93.70%不完整叶间裂缺失部位为肺门及纵隔旁。在薄层横断位CT上，表现为线影的叶间裂包括94.29%左斜裂和71.47%右斜裂，而82.58%水平裂表现为高密度带影。所有叶间裂在矢状位及冠状位CT上均表现为线影。在不完整叶间裂分型中常见类型包括左斜裂Ⅰ型、Ⅱ型，右斜裂Ⅰ型、Ⅲ型及水平裂Ⅰ型、Ⅳ型。结论：不完整叶间裂是常见变异。薄层CT扫描及后处理CT技术有助于准确识别肺叶间裂及其变异。
Abstract
Objective: To analyze the imaging manifestations of interlobar fissures on thin-section and reconstructed CT images. Methods: Three hundred and thirty-three patients were scanned by thin-section CT. Interlobar fissures were observed on axial CT images and reconstructed CT images by multiplanar reformat(MPR) and maximal intensity projection(MIP). The interlobar fissures were characterized by lines, bands, avascular zones, and mixed imaging on the axial CT. The incomplete interlobar fissures were categorized into four types, and the locations of incompleteness were confirmed. Results: Only 20.72% showed fully complete interlobar fissures in all the three types of interlobar fissures. The cases with incomplete fissures included 42.94% of left oblique fissures(LOFs), 38.74% of right oblique fissures(ROFs), and 56.46% of horizontal fissures(HFs). The incomplete parts of interlobar fissures were most likely near the hilar or mediastinal region. On the axial CT, no interlobar fissures with avascular zones, 94.29% of LOFs appeared as lines, 71.47% of ROFs appeared as lines, and 82.58% of HFs appeared as bands. All the interlobar fissures appeared as lines on the coronal and sagittal CT. In classifications of incomplete interlobar fissures, types Ⅰ and Ⅱ were the most frequently observed in LOFs, types Ⅰ and Ⅲ in ROFs, and types Ⅰ and Ⅳ in HFs. Conclusion: Incomplete interlobar fissures are common manifestation on thin-section CT. The techniques of thin-section CT and post-processing techniques can assist in the recognition for interlobar fissures and their variations.
关键词
肺 /
体层摄影术 /
X线计算机
Key words
Lung /
Tomography, X-ray computed
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