超宽带光学连贯弹性从声波到超声波频率的超宽带光学连贯弹性
Xu Feng1, Guo-Yang Li1, Seok-Hyun Yun2,3
1Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, 50 Blossom St. BAR-8, Boston, MA, 02114, USA.
Nature communications
|August 16, 2023
概括
本研究介绍了用于非侵入性机械性质分析的光学连贯弹性学. 新的MHz频率技术提高了材料和组织的分辨率,使其能够进行详细的诊断.
科学领域:
- 生物医学工程 生物医学工程
- 材料科学 材料科学 材料科学
- 光学物理学 光学物理学
背景情况:
- 对粘弹性波的非侵入性成像对于材料和组织机械分析至关重要.
- 传统的弹性图是受到低波频率 (1-10 kHz) 的限制,阻碍了分辨率.
- 对于先进的材料表征和医学诊断,需要更高的频率.
研究的目的:
- 开发一种可扩展到MHz的频率范围的光学连贯弹性绘图技术.
- 为了克服传统弹性学方法的分辨率限制.
- 为了使硬材料和生物组织的机械性质的非侵入性测量.
主要方法:
- 使用光学连贯弹性学 (OCE) 来产生和检测粘弹性波.
- 将OCE的运行频率范围扩展到MHz频谱.
- 在超宽频段中分析雷利表面波分散.
主要成果:
- 实现了MHz频波成像,明显超过了传统的kHz限制.
- 成功测量了像骨头这样的硬材料的刚性.
- 提取了聚合物和水凝的粘弹性剪切模块,在100 Hz到1 MHz的范围内.
- 在ex vivo软骨和in vivo人体皮肤中,以小于毫米的分辨率,分析了深度依赖的剪切模量.
结论:
- 开发的MHz频率OCE技术提供了前所未有的非侵入性机械性能评估.
- 这一进步为材料科学,组织工程和医学诊断提供了高分辨率成像.
- 超宽带宽能力使各种样本中粘弹性行为的详细分析成为可能.
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