在估计局部减弱系数斜率时,使用合成传输孔径超声成像来估计高度衍射效应
Khalid Abdalla1, Na Zhao1, Yuan Xu1
1Physics Department, Toronto Metropolitan University, Toronto, Ontario M5B 2K3, Canada.
JASA express letters
|November 4, 2025
概括
在超声波成像中精确的减弱系数斜率估计通过纠正衍射偏差而得到改善. 这项研究表明,在合成发射孔成像中考虑高度衍射可以显著减少估计误差.
科学领域:
- 医疗成像医学成像
- 声学 声学 在声学方面
- 生物医学工程 生物医学工程
背景情况:
- 定量超声波成像依赖于准确的衰减系数斜率 (ACS) 估计.
- 没有参考幻影的ACS估计方法容易产生衍射偏差.
- 合成发射孔 (STA) 成像是一种常见的超声波技术.
研究的目的:
- 为了研究用于STA成像的参考幻影免费ACS估计中的衍射偏差.
- 为了确定ACS估计中的深度依赖偏差的来源.
- 评估高斯衍射校正在减少ACS误差方面的有效性.
主要方法:
- 模拟和实验研究使用一维线性数组进行.
- 这项研究的重点是合成发射孔径 (STA) 成像.
- 应用了高斯衍射校正来减轻偏差.
主要成果:
- 高度焦点,而不是横向焦点,被确定为深度依赖偏差的来源.
- 偏见导致在焦点之前的ACS低估和超越后的高估.
- 高斯衍射校正将ACS误差从±0.28降低到±0.06 dB/cm-MHz (模拟) 和±0.32降低到±0.09 dB/cm-MHz (实验).
结论:
- 高度衍射在STA成像中显著偏差参考无幻影ACS估计.
- 考虑到高度衍射对于准确的定量超声波至关重要.
- 高斯衍射校正有效地减少了STA成像中的ACS估计错误.
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