对凸阵列超声波成像的宽非聚焦波面的研究
1Department of Biomedical Engineering, City University of Hong Kong, Hong Kong Special Administrative Region.
Ultrasonics
|June 15, 2023
概括
使用凸阵列的超快超声波成像通过三个新的不聚焦波方法得到了改进. 侧向虚拟源分离波成像提供了最佳分辨率但较低的对比度,而倾斜虚拟源分离波成像和阿基米德螺旋成像提供了平衡的性能.
科学领域:
- 医疗成像医学成像
- 超声波技术 超声波技术 超声波技术
- 波浪物理 波浪物理
背景情况:
- 超快超声波成像通过使用宽的不聚焦波来提高率和感兴趣的区域.
- 一致的复合改善了图像质量,但降低了率.
- 目前的不聚焦波方法仅限于凸阵列传感器,阻碍了诸如矢量多普勒和剪切弹性图像等应用.
研究的目的:
- 调查凸阵列超声成像的三种新型不聚焦波面:横向虚拟源定义的分歧波成像 (latDWI),倾斜虚拟源定义的分歧波成像 (tiltDWI) 和基于阿基米德螺旋的成像 (AMI).
- 用全孔径传输来分析它们在分辨率,对比度和光束成形特征方面的性能.
主要方法:
- 分析单色波解决方案用于latDWI,tiltDWI和AMI.
- 理论分析主要叶片宽度,格子叶片位置,-6dB光束宽度和合成发射场响应.
- 使用点目标和低声囊的模拟研究,使用明确的飞行时间公式进行光束成形.
主要成果:
- latDWI实现了最好的横向分辨率,但显示了离轴散射器的最高轴叶水平,降低了图像对比度,特别是在增加复合时.
- tiltDWI和AMI在分辨率和图像对比度方面表现相似.
- AMI显示出优越的对比度与较低的复合数.
结论:
- 研究的波面为超快的凸阵列成像提供了可行的替代方案.
- latDWI在分辨率方面表现出色,但在图像边界上妥协对比.
- tiltDWI和AMI在分辨率和对比度之间提供了一个平衡的权衡,在较低的复合水平上更好地提供更好的对比度时更喜欢AMI.
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