一、概述普通X线摄影,各种组织的影像互相重叠。以一张常规胸片为例,约有60％的面积被骨胳和纵隔的阴影所遮蔽。为了使体内某一层面的组织结构或病灶影像从重叠的阴影中清晰地显示出来,人们采用了分层摄影方法,即所谓X线体层摄影术。 X线体层摄影又名断层摄影、分层摄影 First, an overview of ordinary X-ray photography, a variety of organizations overlapping images. Take a conventional chest for example, about 60% of the area is shadowed by the shadow of the bones and mediastinum. In order to make a certain level of the body structure or lesion images from overlapping shadows clearly displayed, people have adopted a stratified photography method, the so-called X-ray tomography. X-ray tomography, also known as tomography, tomography