Pettersson H, Aspelin P, Boijsen E, Herrlin K, Egund N
Department of Diagnostic Radiology, University Hospital, Lund, Sweden.
Acta Radiol. 1988 May-Jun;29(3):267-71.
The value of digital radiography in musculoskeletal disorders was investigated by assessing its ability to depict anatomic structures and common radiologic features as compared with the conventional film-screen combination. The digital image that was frequency modified was superior to conventional films in delineating soft tissue structures and for areas with large attenuation differences. The conventional film-screen system was superior in depicting small anatomic structures and in identifying the zone close to prostheses. This was explained by the high spatial resolution of the conventional film system and the disturbing halo effect around the prosthesis seen with digital images. The halo effect is an overshoot caused by the unsharp masking operator, which was in this series not changed for individual examinations. The exposure (radiation dose) could be reduced to 50 per cent using the digital system, without any loss of information.
通过评估数字X线摄影与传统屏-片组合相比描绘解剖结构和常见放射学特征的能力，来研究其在肌肉骨骼疾病中的价值。经频率调制的数字图像在描绘软组织结构和具有大衰减差异的区域方面优于传统胶片。传统屏-片系统在描绘小解剖结构和识别假体周围区域方面更具优势。这是由传统胶片系统的高空间分辨率以及数字图像中假体周围出现的干扰性晕影效应所解释的。晕影效应是由锐化掩模算子引起的过冲现象，在本系列研究中，每次检查时该效应均未改变。使用数字系统时，曝光量（辐射剂量）可降低至50%，且不会丢失任何信息。
