背景:使用Suchey-Brooks方法对耻骨联合进行形态学评估被认为是可靠的死亡年龄指标。死亡年龄估计方法可以适应从验尸计算机断层扫描(PMCT)获得的图像。这项研究的目的是评估通过全局照明渲染(GIR)获得的耻骨联合照片真实感图像的实用性,用于从全身PMCT和耻骨上的聚焦PMCT估计死亡年龄。
方法:我们使用SucheyBrooks方法从100PMCT的全身视野(大视野:LFOV)和耻骨聚焦视野(小视野:SFOV)进行了虚拟死亡年龄估计。由三位法医人类学家评估了3D真实感图像,并对两种应用的PMCT方法的准确性以及观察者内部和观察者之间的错误对结果进行了统计评估。
结果:当比较PMCT的两种采集时,使用耻骨聚焦窗口(SFOV)的准确率达到98.5%,而使用全身窗口(LFOV)的准确率为86%.此外,观察者内部和观察者之间的变异性表明,聚焦窗口提供了更好的可重复性和再现性.
结论:在标准PMCT中添加耻骨聚焦视野,并用GIR对其进行处理,似乎是一种适用的技术,可以提高耻骨联合死亡年龄估计的准确率。
BACKGROUND: The morphological assessment of the pubic symphysis using the Suchey-Brooks method is considered a reliable age at death indicator. Age at death estimation methods can be adapted to the images obtained from post-mortem computed tomography (PMCT). The aim of this study is to evaluate the utility of pubic symphysis photorealistic images obtained through Global illumination rendering (GIR) for age at death estimation from whole-body PMCT and from focused PMCT on the pubic bone.
METHODS: We performed virtual age at death estimation using the Suchey Brooks method from both the whole-body field of view (Large Field of View: LFOV) and the pubis-focused field of view (Small and Field of View: SFOV) of 100 PMCT. The 3D photorealistic images were evaluated by three forensic anthropologists and the results were statistically evaluated for accuracy of the two applied PMCT methods and the intra- and inter-observer errors.
RESULTS: When comparing the two acquisitions of PMCT, the accuracy rate reaches 98.5% when using a pubic-focused window (SFOV) compared to 86% with a whole-body window (LFOV). Additionally, the intra- and inter-observer variability has demonstrated that the focused window provides better repeatability and reproducibility.
CONCLUSIONS: Adding a pubic-focused field of view to standard PMCT and processing it with GIR appears to be an applicable technique that increases the accuracy rate for age at death estimation from the pubic symphysis.