X线骨盆测量的方法很多,目前临床上常用的有几何放大尺、坐标尺等,方法虽不复杂,但所得数据常有误差,因此我们根据几何计算法的原理,制作了X线骨盆测量直接读数表(以下简称读数表),以便于测量骨盆时使用。原理及方法 (一)制作原理利用已知的靶片距离与骨盆高度,用相似三角形对边比值相等的原理,求得骨盆径线的实际长度(见下图)。△ABC～△ADE DE:为骨盆某径线的实际长度。 BC:为该径线在胶片上投影的放大长度。 FG:为该径线所在平面至胶片的距离(即骨盆高度)。 AG:为靶片距离。因为相似三角形对边比值相等 There are many ways to measure the X-ray pelvis. At present, there are many commonly used geometrical ruler, ruler and so on. Although the method is not complicated, the obtained data often have errors. Therefore, according to the principle of geometric calculation, we make the direct measurement of the pelvis Reading table (hereinafter referred to as the readings table), in order to facilitate the measurement of pelvic use. Principle and method (a) the production of the principle of using the known distance between the target and the height of the pelvis, with similar triangles on the principle of the same ratio of edge to obtain the actual length of the pelvic diameter (see below). △ ABC ~ △ ADE DE: the actual length of a certain diameter of the pelvis. BC: The length of the projection of the radial line on the film. FG: the distance from the plane of the line to the film (ie, the pelvis height). AG: target distance. Because similar triangles on the opposite side of the ratio