基于射线理论的复合平面波超声成像,用于纠正异常的跨镜成像:幻影实验和模拟
Chen Jiang1, Boyi Li2, Linru Xie2
1Micro-nano System Center, School of Information Science and Technology, Fudan University, 200438, Shanghai, China.
Ultrasonics
|August 4, 2023
概括
这项研究引入了一种新的超声波成像方法,通过头骨进行脑部扫描. 坐标转换射线追踪 (CTRT) 方法纠正了头骨的扭曲,使得在不去除头骨的情况下能够清晰的实时脑部成像.
科学领域:
- 医疗成像医学成像
- 生物医学工程 生物医学工程
- 超声波技术 超声波技术 超声波技术
背景情况:
- 复合平面波成像 (CPWI) 提供高率的大脑成像,但受到头骨诱导的超声波波面扭曲的阻碍.
- 目前的CPWI技术往往需要进行头骨稀疏或切除,从而限制了非侵入性应用.
- 由于头骨偏差,内成像质量显著下降.
研究的目的:
- 为了研究一种CPWI方法,能够通过完整的头骨层对经脑部进行成像.
- 开发和验证一种技术来纠正由头骨引起的超声波扭曲.
- 通过头骨实现高质量,实时,非侵入性脑部成像.
主要方法:
- 开发了一种坐标转换射线追踪 (CTRT) 方法来追踪扭曲的超声波前线.
- CTRT计算了超声波穿过头骨的精确时间延迟.
- 计算的时间延迟用于CPWI光束成形中的偏差校正.
主要成果:
- CTRT准确地追踪了通过头骨的扭曲波面,误差为<0.18%.
- 基于CTRT的CPWI显著改善了内成像质量和散射器定位精度.
- 定位误差从0.5mm减少到0.1mm (轴向) 和0.7mm减少到0.1mm (侧向).
- 图像对比度提高了16.2 dB,分辨率度量减少了4.0%,复合角度增加.
结论:
- 基于CTRT的CPWI方法成功地实现了高质量的内成像,在骨的存在下.
- 与全波模拟相比,CTRT提供了精确的横偏差校正,计算成本低.
- 这项技术显示了实时,非侵入性,异常纠正的跨脑脑图像成像的潜力.
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