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首页> 外文期刊>Ultrasound in Medicine and Biology >Suppression of Grating Lobe Artifacts in Ultrasound Images Formed from Diverging Transmitting Beams by Modulation of Receiving Beams
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Suppression of Grating Lobe Artifacts in Ultrasound Images Formed from Diverging Transmitting Beams by Modulation of Receiving Beams

机译:通过调制接收光束来抑制发散光束形成的超声图像中的光栅波瓣伪影

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摘要

In linear array transducers, owing to regular spacing of the array elements, grating lobes exist in transmission and reception. In ultrasonic imaging involving the use of diverging (unfocused) transmitting beams and steered receiving beams by linear transducer arrays, aperture apodization and spatial combination of steered receiving beams from multiple transmissions are not sufficient to suppress receive-grating lobe artifacts. To further suppress receive-grating lobe artifacts in reconstructed B-mode images, we propose a technique of modulating the receiving beams by a factor that is governed by the envelope of a corresponding signal, which is formed by filtering the receiving beam with a zero-phase low-pass filter with a cut-off frequency that is determined by the receiving beam steering angle. This technique suppressed receive-grating lobe artifacts without significant loss in spatial resolution in offline reconstructed B-mode images from simulation, phantom and in vivo imaging of the carotid artery. In a simulation of point scatterers, a relative reduction in grating lobe artifacts of 40 dB was realized in images from diverging beam scanning.
机译:在线性阵列换能器中,由于阵列元件的规则间隔,在发射和接收中存在光栅波瓣。在涉及通过线性换能器阵列使用发散的(未聚焦)发射束和转向接收束的超声成像中,孔径变迹和来自多个发射的转向接收束的空间组合不足以抑制接收光栅波瓣伪像。为了进一步抑制重建的B模式图像中的接收光栅波瓣伪影,我们提出了一种通过由相应信号的包络线决定的因子调制接收波束的技术,该因子是通过对接收波束进行零滤波来形成的。截止频率由接收光束转向角确定的相位低通滤波器。这项技术抑制了接收光栅的叶伪影,而在从模拟,体模和颈动脉体内成像的离线重建B模式图像中,空间分辨率没有明显损失。在点散射体的模拟中,发散光束扫描的图像实现了40 dB的光栅波瓣伪影的相对减少。

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