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Functional changes in arteries induced by pulsed high-intensity focused ultrasound

机译:脉冲高强度聚焦超声引起的动脉功能改变

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Continuous high-intensity focused ultrasound (HIFU) at various intensities has been shown to induce functional changes in arteries. The objective of the current study was to investigate the functional changes in arteries when pulsed HIFU is used at various acoustic power levels. Sonication was applied at an ultrasound frequency of 1 MHz with a burst length of 50 ms and a repetition frequency of 1 Hz. The duration of the whole sonication was 6 s. The femoral arteries and abdominal aortas of Sprague-Dawley rats were surgically exposed and sonicated with pulsed HIFU; the pulsed-HIFU beam was aimed using color images of the blood flow. The peak systolic velocity (PSV) of the blood flow, as measured by Doppler velocimetry, increased in the arteries to which pulsed HIFU had been applied at acoustic powers of 15, 30, and 45 W. The increase in PSV was correlated with the acoustic power of the pulsed HIFU. The temperatures recorded by the thermocouples placed above and below the aorta surfaces did not change significantly during the sonication. Furthermore, no histological changes were found and the vessel wall showed no obvious temperature rise. Therefore, our results indicate that the functional changes induced by pulsed-HIFU exposure are mainly due to mechanical effects.
机译:各种强度的连续高强度聚焦超声(HIFU)已显示可引起动脉功能改变。当前研究的目的是研究在各种声功率水平下使用脉冲HIFU时动脉的功能变化。超声处理的频率为1 MHz,突发长度为50 ms,重复频率为1 Hz。整个超声处理的持续时间为6 s。手术暴露Sprague-Dawley大鼠的股动脉和腹主动脉,并用脉冲HIFU超声处理。脉冲HIFU光束是使用血流的彩色图像瞄准的。通过多普勒测速仪测得的血流的峰值收缩速度(PSV)在以15 W,30 W和45 W的声功率施加的动脉中增加。PSV的增加与声波相关脉冲HIFU的功率。在超声处理期间,放置在主动脉表面上方和下方的热电偶记录的温度没有明显变化。此外,没有发现组织学变化,并且血管壁没有显示出明显的温度升高。因此,我们的结果表明,脉冲式HIFU暴露引起的功能变化主要归因于机械作用。

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