McWilliam J S, Rausén R
Swed Dent J Suppl. 1982;15:239-46.
Recordings of natural head position may be performed directly during radiographic registration or indirectly by a photographic transfer procedure. The aim of this investigation was to examine and quantify the different sources of error in one photographic method using an analysis of variance. The material consisted of 15 senior dental students between the ages of 24-34 years. Intra-observer results show that the error associated with transfer of the plumb line to the tracing and digital recording of the reference points is small in comparison with the tracing error and intra-individual postural variation as registered photographically. By relating the total analysis error to the inter-individual postural variation it was possible to perform a preliminary evaluation of the precision of the entire registration method prior to continued collection of raw data. In this case it was found that duplication of tracings and photographs was the most rational approach resulting in an analysis error equivalent to 9.5 percent of the estimated postural variation between individuals.
自然头部位置的记录可在放射学配准过程中直接进行，或通过照片转移程序间接进行。本研究的目的是使用方差分析来检查和量化一种摄影方法中不同的误差来源。材料包括15名年龄在24至34岁之间的高年级牙科学生。观察者内结果表明，与铅垂线转移到参考点的描图和数字记录相关的误差，与摄影记录的描图误差和个体内姿势变化相比很小。通过将总分析误差与个体间姿势变化相关联，可以在继续收集原始数据之前对整个配准方法的精度进行初步评估。在这种情况下，发现重复描图和照片是最合理的方法，导致的分析误差相当于个体间估计姿势变化的9.5%。
