在法医牙科鉴定中有效的原子数图像的有用性:光子计数计算机断层扫描是合适的
Takashi Asahara1, Shunsuke Okada2, Hiroaki Hayashi3
1Department of Radiological Technology, Faculty of Health Sciences, Okayama University, Okayama, 700-8558, Japan.
使用光子计数CT (PC-CT) 的有效原子数 (Zeff) 成像可以准确地识别人工牙材料,用于法医识别. 这种定量分析为牙科法医提供了一种新的方法.
科学领域:
- 医疗成像医学成像
- 法医牙科 法医牙科
- 材料科学 材料科学 材料科学
背景情况:
- 牙科修复对于识别身份不明的个人至关重要.
- 目前用于分析牙科材料的视觉和X射线方法缺乏定量精度.
- 人工牙科材料的定量分析是可靠的识别所需的.
研究的目的:
- 用光子计数计算机断层扫描 (PC-CT) 来演示有效的原子数 (Zeff) 图像的创建.
- 评估PC-CT在识别人工牙科材料方面的准确性.
- 为法医牙科提出一种新的定量方法.
主要方法:
- 使用光子计数CT (PC-CT),双能CT (DE-CT) 和光子计数扫描图.
- 使用70 keV和100 keV虚拟单色X射线图像开发了PC-CT的新泽夫分析算法.
- 检查了已知材料的幻影,人工牙材料,以及嵌入牙内嵌的头部幻影.
主要成果:
- 通过PC-CT,DE-CT和PC扫描仪成功创建了Zeff图像,误差最小 (分别为±0.40,±0.21,±0.24).
- 人工牙科材料的有效原子数 (Zeff) 值被独特地确定,不论成像系统如何.
- 即使在头部幻影中嵌入牙科材料时,也获得了一致的结果.
结论:
- 有效原子数 (Zeff) 值是识别和区分人工牙科材料的可靠量化指标.
- 在法医调查中,PC-CT提供了一种精确的方法来对牙科材料进行定量分析.
- 这项研究建立了基于定量材料分析的法医牙科新型诊断程序.
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