基于QCT的计算骨强度评估更新了MRI衍生的"隐藏"微孔性
Samuel McPhee1, Lucy E Kershaw2, Carola R Daniel3
1School of Engineering and Physical Sciences, Institute of Mechanical, Process and Energy Engineering, Heriot-Watt University, Edinburgh, UK.
Journal of the mechanical behavior of biomedical materials
|September 23, 2023
概括
研究人员开发了一种新型的成像方法,可以在体内检测隐藏的骨微损伤,这对于评估骨折风险至关重要. 这种技术使用了MRI和QCT的组合,量化了先前存在的损伤,改善了骨脆弱性的预测.
科学领域:
- 生物力学 生物力学
- 生物材料科学 生物材料科学
- 医疗成像医学成像
背景情况:
- 负载造成的骨微损伤会降低硬度和强度,导致骨脆弱.
- 目前的临床成像不能在体内监测微损伤,限制骨折风险评估.
- 现有的计算方法不考虑在特定时间点存在的微伤害.
研究的目的:
- 通过临床成像提出和验证一种计算方法,用于使用临床成像量化体内骨微损伤.
- 引入"隐藏的多孔性"作为预先存在的微伤害的替代品.
- 将这种微伤害量化纳入骨组织非线性构成模型.
主要方法:
- 结合定量计算断层扫描 (QCT) 和磁共振成像 (MRI) 在马的手臂上.
- 使用基于补丁的相似性方法对液体敏感的MRI序列进行量化微损伤.
- 生成的MRI衍生的伪CT图像,以计算先前存在的损伤 (Dpex) 变量.
- 将Dpex集成到非线性构成骨模型和有限元素分析中.
主要成果:
- 检测到的Dpex值与材料刚度 (高达35.3%) 和屈服应力 (高达35.3%) 的显著降低相关.
- 结合Dpex的有限元模型显示,损伤和减少状硬度 (p=0.001) 和强度 (p<0.001) 之间存在显著的相关性.
- 拟议的方法证明了临床CT在检测由于部分体积效应造成的微损伤方面的局限性.
结论:
- 开发的"隐形多孔性"方法有效地使用临床可用的成像技术在体内测量骨微损伤.
- 这种方法通过计算累积的微损伤来提高骨折风险评估.
- 研究结果支持在人类骨疾病中更广泛的应用,如骨关节炎,骨质疏松症和骨癌.
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