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Harmonic response from microscopic antibubbles

机译：微小气泡产生的谐波响应

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摘要

An antibubble is a gas bubble containing a liquid droplet core. Both the droplet and the gas bubble are typically surrounded by stabilising shells. Owing to electrostatic forces exerted by these shells, core droplets of micrometer diameter do not readily coalesce with the surrounding liquid medium. Owing to the incompressibility of the liquid droplet core, antibubbles will oscillate asymmetrically, ie., the radial excursion amplitude of the surface is greater during expansion than during contraction, when subjected to diagnostic ultrasound. Consequently, the harmonic content of the ultrasound signal radiated from antibubbles must be higher than that from identical bubbles without a liquid core. Whether the harmonic signal component generated by physical antibubbles is higher than the harmonic component of identical bubbles without a core has been studied here. We subjected prefabricated antibubbles and identical bubbles without core droplets to 1-MHz ultrasound and to a commercial ultrasound system, and recorded the spectra with a broadband transducer oriented perpendicularly to the transmitter. Normalised by the acoustic response from the medium, the antibubble signal shows stronger higher harmonics than the reference signal, and negligible fundamental response. In conclusion, antibubbles are suitable candidates for harmonic imaging. The generation of higher harmonics without fundamental has been attributed to asymmetric antibubble expansion.
机译：防气泡是包含液滴核心的气泡。液滴和气泡通常都被稳定壳包围。由于这些壳施加的静电力，微米直径的核滴不易与周围的液体介质聚结。由于液滴芯的不可压缩性，防气泡将不对称地振荡，即，当经受诊断超声时，在膨胀期间表面的径向偏移幅度大于在收缩期间的径向偏移幅度。因此，从反气泡辐射的超声波信号的谐波含量必须高于没有液芯的相同气泡的谐波含量。这里研究了由物理防气泡产生的谐波信号分量是否高于没有芯的相同气泡的谐波分量。我们对预制的防气泡和无芯滴的相同气泡进行了1-MHz超声和商用超声系统的测试，并使用垂直于发射器的宽带换能器记录了光谱。通过来自介质的声音响应进行归一化，抗气泡信号显示出比参考信号更强的谐波，并且基本响应可忽略不计。总之，防气泡是谐波成像的合适候选者。没有基波的高次谐波的产生归因于不对称的抗气泡膨胀。

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  • 来源
    《Applied Acoustics》 |2018年第8期|148-150|共3页
  • 作者

    Postema Michiel; Novell Anthony; Sennoga Charles; Poortinga Albert T.; Bouakaz Ayache;

  • 作者单位

    UFR Med, INSERM, Res Unit Imaging & Brain U1253, 10 Blvd Tonnelle, F-37032 Tours, France;

    UFR Med, INSERM, Res Unit Imaging & Brain U1253, 10 Blvd Tonnelle, F-37032 Tours, France;

    UFR Med, INSERM, Res Unit Imaging & Brain U1253, 10 Blvd Tonnelle, F-37032 Tours, France;

    Eindhoven Univ Technol, Dept Mech Engn, NL-5612 AZ Eindhoven, Netherlands;

    UFR Med, INSERM, Res Unit Imaging & Brain U1253, 10 Blvd Tonnelle, F-37032 Tours, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Microbubbles; Ultrasound contrast agent; Imaging; Ultrasonics;

    机译：微泡;超声造影剂;成像;超声;

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