Versteeg C H, Sanderink G C, Geraets W G, van der Stelt P F
Department of Oral Radiology, Academic Centre for Dentistry Amsterdam (ACTA), The Netherlands.
Dentomaxillofac Radiol. 1997 Nov;26(6):337-43. doi: 10.1038/sj.dmfr.4600296.
To test the effect of altering image size on diagnostic quality.
Endodontic files, size 10 and 15 were prepared to full root length and 1.5 mm short, in upper and lower molars and premolars. Digital images of the Sidexis (S) and Visualix/Vixa (V) system were reduced in size to Digora (D) scale, and the D images were enlarged to S scale. ROC analysis was performed and data analysed with MANOVA statistics.
Assessment of root canal length with file size 10 was less accurate for the S images reduced in size, compared with the original S images (P < 0.011). All other differences were not significant (P > 0.081).
Relevant diagnostic information may be lost when images are reduced in size. Therefore, for optimal presentation, the smaller images should be enlarged rather than the larger ones reduced.
测试改变图像大小对诊断质量的影响。
在上颌和下颌磨牙及前磨牙中，将10号和15号根管锉预备至全长及短1.5毫米。Sidexis（S）和Visualix/Vixa（V）系统的数字图像缩小至Digora（D）尺寸，而D尺寸图像放大至S尺寸。进行ROC分析，并采用多变量方差分析统计方法分析数据。
与原始S图像相比，尺寸缩小的S图像在使用10号锉评估根管长度时准确性较低（P < 0.011）。所有其他差异均无统计学意义（P > 0.081）。
图像尺寸缩小时可能会丢失相关诊断信息。因此，为实现最佳呈现效果，应放大较小的图像而非缩小较大的图像。
