增感屏牙片成像效果不佳的原因分析

Reasons for the poor quality imaging with the intensifying screen of dental film

目的通过对比测试,探讨增感屏牙片成像效果不佳的原因,以便更好地使用增感屏牙片。方法将增感屏牙片和常规无增感屏牙片各1000张,以常规分角线投照技术完成照片,用以测试两种牙片在影像清晰度、颗粒性、伪影等成像指标方面的差异。结果增感屏牙片明显比无增感屏牙片成像效果差,从成像效果来看,部分是受了伪影的影响。结论增感屏的荧光扩散、屏胶接触不良、X线斜射效应、屏结构斑点、摄片技术及暗室操作方式等,是引起增感屏牙片影像清晰度降低、颗粒性变差、伪影增多等成像效果不佳的主要原因。

Objective To analyze the poor quality imagine with the intensifying screen of dental film, and to improve the clinical application. Methods With the routine imaging protocol, 1000 dental films with intensifying screen and 1000 conventional dental films were involved in this study. The definition, grains and artifacts of the images were comparatively studied. Results The imaging quality of the intensifying screen dental film was worse than that of the conventional dental films, and the influence of the artifacts were not excluded. Conclusion The spread of fluorescent light from screen, poor screen film contact, effect of oblique projection of X ray, fleck on screen structure, radiographic technique and film process results in the decrease of image definition, poor grain of the film, more artifacts.