近年来,肺结核的发病率明显下降,某些非结核性肺部疾病较前增多。这些疾病中,特别是肺癌的发病率明显增高,临床要求尽快确诊。弥漫性肺部疾病病因复杂,X线表现相似,依靠普通X线及常规实验室检查远不能满足临床诊断的需要。为适应需要,随着科学技术日新月异,肺科疾病的检查技术亦有较大 In recent years, the incidence of tuberculosis has dropped significantly, and some non-tuberculous lung diseases have increased. Among these diseases, the incidence of lung cancer in particular has increased significantly, and clinical requirements have been confirmed as soon as possible. The cause of diffuse pulmonary disease is complex, and the X-ray findings are similar. Relying on ordinary X-rays and routine laboratory tests can not meet the needs of clinical diagnosis. In order to meet the needs, with the rapid advancement of science and technology, the inspection techniques for pulmonary diseases are also large.