X 线一次曝光多层摄影,是在单层体层摄影设备基础上增加一个多层暗匣,便能同时摄取数张不同层面的 X 线照片。与单层比较它具有以下优点:一、一次曝光可同时摄取3—4张体层照片,从而减少 X 线管照射次数,延长其使用寿命。二、拍摄的层次比单层准确,有利于提高诊断质量。因为数张软片是在一次吸气的状态下摄取,而单层是在分次吸气的情况下拍摄,每次拍摄无法保持相同的吸气程度,所以影响层次深度的准确性。 X-ray one-time exposure multi-layer photography is based on the single-layer tomography equipment to add a multi-layer cassette, you can simultaneously take several different levels of X-ray pictures. Compared with the single-layer it has the following advantages: First, one exposure can take 3-4 photos at the same time, thereby reducing the number of X-ray tube irradiation to extend its life. Second, the level of shooting than the single accurate, is conducive to improving the diagnostic quality. Because several sheets of film are taken in an inspiratory state, and the single layer is taken under a separate inhalation, each shot can not maintain the same degree of aspiration, thus affecting the accuracy of the level depth.