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Preliminary comparative results on axial resolution using both coded excitation and conventional pulses in ultrasound A-mode scan

机译：超声A模式扫描中使用编码激励和常规脉冲的轴向分辨率的初步比较结果

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This paper presents a comparative study of axial resolution of ultrasound system with waves generated by coded excitation pulse and conventional pulses both interacting with computational phantoms producing A-line and B-mode images. The mathematical phantoms were generated as two impulse reflectors positioned at 10 mm (first reflector) and at 10.9 mm (second reflector). The second reflector was moved towards the first reflector in 0.1 mm steps. Reflectors were in the farfield of a 5 MHz transducer and waves are travelling in water. The transducer was excited with conventional short pulse (CP) and with coded excitation pulse (CEP). CEP was achieved with chirps with 18 µs duration. The combinations of transducer excitation (CP and CEP) with conventional and matched (MF) and mismatched filters (MMF) were tested and our results have shown that the system resolution was around 0.5 mm and that the combination CEP+MMF presented worse resolution and speckle effects when compared to other combinations probably due to the broadening of the mainlobe caused by this kind of operation.
机译：本文介绍了通过编码激发脉冲和产生A线和B模式图像的计算模拟脉冲和传统脉冲产生的波浪的超声系统轴向分辨率的比较研究。产生数学幽灵作为位于10mm（第一反射器）和10.9mm（第二反射器）定位的两个脉冲反射器。第二反射器以0.1mm的步骤朝向第一反射器移动。反射器在5 MHz传感器的法尔场，波浪在水中行驶。换能器用传统的短脉冲（CP）和编码激发脉冲（CEP）激发。 CEP是用18＆＃x00b5;持续时间的啁啾而达到。测试了传统和匹配（MF）和错配滤波器（MMF）的传感器激发（CP和CEP）的组合，并我们的结果表明系统分辨率约为0.5mm，并且CEP和＃X002B组合; MMF呈现更糟糕的分辨率与其他组合相比，斑点效果可能是由于这种操作引起的mainlobe的扩大。

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