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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Experimental investigation of finite amplitude distortion-based,second harmonic pulse echo ultrasonic imaging
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Experimental investigation of finite amplitude distortion-based,second harmonic pulse echo ultrasonic imaging

机译：基于有限振幅畸变的二次谐波脉冲回波超声成像实验研究

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摘要

The computational predictions for the imaging potential of thensecond harmonic produced by finite amplitude distortion wereninvestigated with a simple experiment. A focused transducer containingnconcentric 2.5 MHz and 5.0 MHz elements was used to obtain a sequence ofnradio-frequency (r-f) backscattered signals using a tissue equivalentnphantom. The 2.5 MHz element was used as the transmitter and the 5.0 MHznelement was used as the receiver. At 0.68 cm in front of the geometricnfocal point of the transducer, the phantom contained a 0.6 cm diameterncylindrical volume which contained no scatterers. Each of these r-fnsignals was then processed to produce the corresponding fundamental (2.5nMHz-centered) and second harmonic (5.0 MHz-centered) envelopes. Thencontrast resolution obtained for the scatterer-free or cyst region ofnthe envelopes was compared against the computed prediction and goodnagreement was obtained. The results of this experiment also suggest thatnthe simple one-pulse scheme may be adequate for second harmonic imaging
机译：通过简单的实验研究了有限振幅畸变产生的二次谐波成像潜能的计算预测。使用包含同心的2.5 MHz和5.0 MHz元素的聚焦换能器，使用组织等效幻像来获得一系列射频（r-f）后向散射信号。 2.5 MHz的元素用作发送器，而5.0 MHz的元素用作接收器。在换能器的几何焦点前方0.68厘米处，体模包含一个直径为0.6厘米的圆柱体，其中不包含散射体。然后，处理每个这些r-fnsignal，以产生相应的基波（中心为2.5nMHz）和二次谐波（中心为5.0MHz）包络。然后将获得的对信封无散射区或囊肿区的对比度分辨率与计算的预测值进行比较，并获得良好的协议。实验结果还表明，简单的单脉冲方案可能足以满足二次谐波成像的需要

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