X线干板照相系1937年由Carlson所发明,是由铝质板涂上半导体硒而制成的硒板。使用时将硒板充电,经X线投照后,再吸附碳粉转印于普通白纸上而显象的一种技术。硒板并可反复使用,它产生的软组织影象比常规X线影象清晰,因而在上气道如喉部异物、声门下狭窄和喉部软组织损伤的检查都有实用价值。作者报告二例,例1,七个月女婴,患脑膜炎并发上气道严重阻塞症状,经气管切开插入Alder Hey套管并行喉镜检扩张,但各个时期的内窥镜检都未能确定狭窄的范围,患儿长期不能堵管,后经二次干板照相发现套管外管背侧小孔未能位于气道内,以 The X-ray dry film camera was invented by Carlson in 1937 and is a selenium plate made of aluminum plate coated with semiconductor selenium. When the selenium plate is charged, after the X-ray projection, the toner is then transferred onto an ordinary white paper to be visualized. Selenium plates can be used repeatedly, and the soft tissue images produced by them are clearer than conventional X-ray images. Therefore, they have practical value in the examination of upper airways such as laryngeal foreign bodies, subglottic stenosis, and laryngeal soft tissue injury. The authors report two cases, Example 1, seven-months-old girl, suffering from meningitis complicated by severe obstruction of the upper airway, tracheotomy, insertion of an Alder Hey cannula, and parallel laryngoscopy for dilatation, but no endoscopy was performed at all stages. Can determine the narrow range, the child can not block the tube for a long time, after the second dry film photography found that the outer hole of the outer tube of the cannula was not located in the airway.