【摘要】 目的探讨X射线摄影测量出现误差的原因,提高X射线测量的准确性。方法自行研制X射线摄影效应尺,由底尺、高度尺和活动尺三大部分构成,分别刻以灌注铅胶的刻度,用于实际测量。检测焦片距100cm、物片距20cm时显示图像尺寸与实际尺寸的大小。结果各公司平板显示范围未能达到所标识的43 cm×43 cm,Kodak 7500、GE、佳能、西门子4家公司实际显示范围分别为41.5 cm、40.5 cm、42.5 cm、41.0 cm。而焦片距100 cm、物体厚度20 cm进行曝光时,底尺显示43.0 cm时,实际物体尺寸仅有36.0 cm,7.0 cm的物体盲区未被显示。结论为避免图像放大引起的失真,摄影时使用X射线摄影效应测定尺即可进行准确测量,减少误差。更多还原

【Abstract】 Objective To explore the cause of the measurement errors in X-ray photography,and improve the accuracy of X-ray measurement.Methods A X-ray photography effect measuring ruler was developed,which was composed of bottom scale,height scale and activities scale and engraved with perfusion lead plastic.The difference between displayed size and actual size was detected with focus to film distance of 100 cm and object to film distance of 20 cm.Results The ranges of flat panel display by the products from every company failed to reach the marked 43 cm × 43 cm,and the display range of Kodak 7500,GE,Canon,Siemens were 41.5 cm,40.5 cm,42.5 cm and 41.0 cm,respectively.With the aforementioned parameters for exposure,when the bottom scale showed to be 43.0 cm,the actual scale was only 36.0 cm,and 7.0 cm blind scale was not displayed.Conclusion It is demonstrated that X-ray photography effect measuring ruler could accurately determine the actual scale and reduce the measure error for avoiding errors and image distortion.更多还原