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对于合成光圈延迟乘法和总和重建的F数优化

Philip M Holmes¹, Hyoung-Ki Lee², Matthew W Urban²

¹Mayo Clinic Graduate School of Biomedical Sciences, 200 First Street SW, Rochester, MN 55905, USA.

|September 12, 2023

概括

选择发送和接收f-numbers显著影响超声波图像质量. 这项研究系统地分析了f数对延迟和和 (DAS) 和延迟乘和和 (DMAS) 合成光圈成像的影响,以优化对比度和分辨率.

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
信号处理信号处理

背景情况:

发射和接收的f数量会影响超声波图像对比度和空间分辨率.
以前的研究集中在延迟和总和 (DAS) 平面波成像中的接收f数效应上.
缺乏对DAS和延迟乘和和和 (DMAS) 合成光圈 (SA) 成像中的f数的系统研究.

研究的目的:

系统地评估变化的发送和接收f数对DAS和DMAS SA成像的影响.
量化对主叶与侧叶能量比率 (MSER),一般化对比与噪声比率 (gCNR) 和空间分辨率的影响.
为SA成像算法中f数选择提供指导.

主要方法:

用水箱中的电线目标和标准成像幻影仪进行了测量.
发送和接收的f-numbers从1到5在0.2个增量变化.
分析了包括MSER,ChNR和空间分辨率在内的关键指标,用于DAS和DMAS重建.

主要成果:

对于DAS和DMAS,中距离发射f数 (2-4) 和高接收f数 (>4) 均实现了更高的MSER.
DAS 实现了高 gCNR,具有高的发送/接收 f 数 (> 4),但空间分辨率降低.
虽然总体GcNR低于DAS,但DMAS在低发射 (<3) 和高接收f数 (>4) 的情况下实现了高GcNR,并且空间分辨率的权衡较低. 对于这两种方法来说,观察到高空间分辨率与低接收f数 (<2). 一般来说,DMAS的空间分辨率比DAS更高.

结论:

在DAS和DMAS SA成像中,F数的选择极大地影响了对比度和分辨率之间的性能权衡.
与DAS相比,DMAS在对比度和分辨率之间提供了潜在的更好的平衡.
研究结果可以为使用SA技术的特定超声波成像应用提供最佳的f数选择.

关键词:

这就是"apodization"的意思.延迟-乘以-和-加起来拖延和积累的时间这是一个F号码.超声波超声波是指超声波的使用.

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