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arXiv 2111.04593physics.med-pheess.SP
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频率相关的F数增加了快速脉冲回波超声成像中的对比度和空间分辨率

Frequency-Dependent F-Number Increases the Contrast and the Spatial Resolution in Fast Pulse-Echo Ultrasound Imaging

Martin F. Schiffner, Georg Schmitz

摘要:

固定$F$ -数量减少快速脉冲回波超声成像中的栅瓣伪影。这种$F$数导致动态接收子孔径,其宽度随焦点位置而变化。然而,这些子孔径忽略了被排除的射频(RF)信号中的有用低频分量,因此降低了横向分辨率。在这里,我们提出了一个频率相关的$F$数,同时抑制栅瓣伪影,并保持横向分辨率。该$F$数在高频处减小接收子孔径以去除RF信号的空间欠采样分量并抑制栅瓣。在低频时,$F$ -号放大接收子孔径,以使用所有RF信号的分量并保持横向分辨率。实验验证了所提出的$F$ -数,并证明了对比度和线目标的宽度分别提高了3.2%和12.8%。

英文摘要:

Fixed $F$-numbers reduce grating lobe artifacts in fast pulse-echo ultrasound imaging. Such $F$-numbers result in dynamic receive subapertures whose widths vary with the focal position. These subapertures, however, ignore useful low-frequency components in the excluded radio frequency (RF) signals and, thus, reduce the lateral resolution. Here, we propose a frequency-dependent $F$-number to simultaneously suppress grating lobe artifacts and maintain the lateral resolution. This $F$-number, at high frequencies, reduces the receive subaperture to remove spatially undersampled components of the RF signals and suppress grating lobes. The $F$-number, at low frequencies, enlarges the receive subaperture to use the components of all RF signals and maintain the lateral resolution. Experiments validated the proposed $F$-number and demonstrated improvements in the contrast and the widths of wire targets of up to 3.2 % and 12.8 %, respectively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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