肺门正位体层摄影是诊断肺部疾病的常规X线检查方法之一。对于清晰显示肺门结构、观察气管、主支气管、部分叶、段支气管、肺门区肿块,包括原发或继发淋巴结肿大以及位于肺野内,与肺门同一体层深度的病灶情况具有极大应用价值。 在常规摄影条件下,胸部的解剖结构缘因含气组织较多的特殊性在X光胶片上形成了对比度大,层次较少的影像特点。在肺门正位体层摄影中,由于含气组织黑化度较大使部份主支气管,叶、段支气管,肺野内的结构无法显示清晰。过去,暗室常规均是人工冲洗胶片,因此,通过人为的控制显影条件,可以避免因黑化度过大而使肺野内结构显示不清楚。而在使用自 Hilar orthostatic tomography is one of the routine methods of X-ray diagnosis of lung disease. To clearly show the hilar structure, observe the trachea, the main bronchus, some leaves, section bronchus, hilar mass, including primary or secondary lymph node enlargement and is located in the lung field, the same depth with the hilar lesions have extreme Big application value. Under conventional photographic conditions, the anatomy of the thoracic anatomical structure of the chest due to the more gas-specific tissue in the X-ray film to form a large contrast, less features of the image. In the hilar orthostatic tomography, the structure of the main bronchus, leaf, segment bronchus and lung field can not be clearly displayed due to the large degree of blackening of the gas-containing tissue. In the past, darkroom routine was manually processed film, therefore, by artificially control the development conditions, to avoid the excess of the degree of hyperintense lung field structure is not clear. While using it