ty -jour t1-呼气胸部X光片不会通过增强的对比度JF提高小顶尖气动座的可见性 - 欧洲呼吸杂志RP au -haakman，CD au -sedja，tg au -de jong，ka au -postmus，pe y1-1996/03/01 ur -http：//www.qdcxjkg.com/content.com/content/9/3/3/406.abstract.abstractN2-小顶尖气胸的演示应该通过呼气性胸部X光片来促进。这项研究旨在分析小顶心动肌患者的呼气性胸部X光片的视觉对比度增强。使用光密度（OD）使用密度计（X-Rite 3001）在54个配对的灵感和呼气性胸部X光片上获得22例小顶尖气动膜的患者。测量了OD：在第一和第二胸椎之间的椎间空间（区域1）之间；在受影响的肺实质的周围部分（区域2）；并在毗邻的胸腔内空间（区域3）。在配对的灵感和呼气性胸部X光片之间获得了每个区域的OD的极好相关性。呼气性胸部X光片上所有区域的OD明显高于Inspiratory胸部X光片。 Contrast between pulmonary parenchyma and intrapleural air in inspiratory and expiratory films did not differ significantly. Expiratory chest radiographs do not improve visibility of small apical pneumothoraces by enhanced contrast between pulmonary parenchyma and intrapleural air. Expiratory chest radiographs show equally increased OD in the area of lung tissue and intrapleural air, caused by increased extrapulmonary tissue density during expiration, resulting in increased radiation exposure monitored by the ionization chambers of standard radiological equipment. If expiratory chest radiographs are really improving the visibility of apical pneumothoraces, there must be other reasons than contrast enhancement to explain this. ER -