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最近,由于实际工作的需要,我们摸索试验用了X线管与螢屏同时移动的定位法,不仅在机器上无须附加任何装置(仅须保持螢屏与X线之中心线互相垂直即可),而且在一般透视下发现异物,可随时进行定位。患者仰卧(或俯卧)于X线检查台上,使X线中心线垂直于螢屏中心点,并使异物(J)之影像落于此中心点上(如图1),然后使管球向左或向右移动任一固定之距离(a),在螢屏上找出异物影像(d),并作一标志(如图2)。最后测定此影像与螢屏中点之距离(OD)以及焦点至螢屏之距离(FO),代入下列公式:JO’=(FO(DO-d))/(DO)JO’为异物至螢屏之距离,减去螢屏至皮膚之距离,即为异物之深度。计算:于图2,J点引JO’平行于FO,
Recently, due to the actual work needs, we explored the experiment with the X-ray tube and the screen at the same time moving the positioning method, not only in the machine without any additional device (just keep the screen and the X-ray centerline perpendicular to each other) , But also found in foreign objects in general perspective, can be positioned at any time. The patient supine (or prone) on the X-ray examination table, the X-ray center line perpendicular to the center of the screen, and the foreign body (J) image falls on this center point (Figure 1) Left or right to move any fixed distance (a), locate the foreign body image on the screen (d), and make a mark (Figure 2). Finally, determine the distance between the image and the center of the screen (OD) and the distance from the screen to the screen (FO), and insert the following formula: JO ’= (FO (DO-d)) / Screen distance, minus the screen to the distance of the skin, that is, the depth of foreign body. Calculation: In Figure 2, J point lead JO ’parallel to the FO,