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目的:探讨计算机X线摄影(computed radiography,CR)的影像质量及其主要影响因素。材料和方法:参照卫生部“三甲”医院检查采用的标准,评定甲、乙、丙级和废片。对1000份不同部位CR影像片和1000份与前者部位相同的传统片影像的质量进行评定,分析造成非甲级片的成因,对两组影像质量及影响因素进行统计学分析。结果:CR片的甲片率为53.6％,明显高于传统片42.5％的甲片率,造成CR非甲级片主要成因是体位及铅字号码放置缺陷、摄影体部有异物和摄影前患者准备不佳(98.92％),传统片为76.7％;摄影条件不佳、影像处理技术不良(暗室技术)对CR影像质量影响不大(1.08％),而对传统片影像质量的影响为23.3％。CR片的废片率为0.0％(不包括机器故障造成的废片),低于传统片的2.0％废片率。结论:CR片影像质量明显优于传统片的影像质量,可广泛应用于除动态影像检查外的临床影像学检查。
Objective: To investigate the image quality of computed radiography (CR) and its main influential factors. Materials and Methods: According to the standards adopted by the “First Class A” hospital of the Ministry of Health, evaluate Grade A, Grade B, Grade C and scrap pieces. The quality of 1000 pieces of CR film and 1000 pieces of traditional film images with the same location were evaluated. The cause of non-A film was analyzed and the image quality and influencing factors were statistically analyzed. Results: The rate of nails in CR films was 53.6%, which was significantly higher than that in traditional films (42.5%). The main causes of CR non-A films were body position and type number placement defects, foreign bodies in photography body and preparation before photographing Poor (98.92%), traditional film was 76.7%; poor photographic conditions, poor image processing technology (darkroom technology) had little effect on CR image quality (1.08%), while the impact on traditional image quality was 23.3%. CR chip scrap rate was 0.0% (not including machine malfunction caused scrap), lower than the 2.0% of traditional film waste rate. Conclusion: The image quality of CR film is better than that of traditional film. It can be widely used in clinical imaging except dynamic image examination.