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首页> 外文期刊>Ultrasound in Medicine and Biology >High-frequency backscatter and attenuation measurements of porcine erythrocyte suspensions between 30-90 MHz.
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High-frequency backscatter and attenuation measurements of porcine erythrocyte suspensions between 30-90 MHz.

机译：猪血红细胞悬液在30-90 MHz之间的高频反向散射和衰减测量。

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摘要

There are now diagnostic ultrasonic imaging devices that operate at very high frequencies (VHF) of 20 MHz and beyond for clinical applications in ophthalmology, dermatology and vascular surgery. To be able to better interpret these images and to further the development of these devices, knowledge of ultrasonic attenuation and scattering of biologic tissues, such as blood, in the high-frequency range is crucial. VHF attenuation and backscatter experiments were made on porcine red blood cell (RBC) suspensions, for which much data on attenuation and backscatter can be found in the literature in the lower frequency range. Attenuation and backscatter at hematocrits of 6%, 10%, 15%, 20%, 25% and 30% from 30 to 90 MHz were measured using a modified substitution method that allows the utilization of focused transducers. The results show that the attenuation coefficient from all suspensions increased linearly with frequency and the backscatter coefficient for low hematocrit suspensions was found to have a maximum between 10% and 15%. At higher hematocrits, a decrease in the frequency-dependence was observed, possibly indicating that Rayleigh scattering is no longer valid because the wavelength in the VHF range is comparable to the size of a porcine RBC.
机译：现在有诊断超声成像设备，其工作频率为20 MHz甚至更高，可用于眼科，皮肤病学和血管外科的临床应用。为了能够更好地解释这些图像并进一步发展这些设备，了解超声衰减和生物组织（例如血液）在高频范围内的散射至关重要。在猪红细胞（RBC）悬浮液上进行了VHF衰减和反向散射实验，有关文献中在较低频率范围内可以找到许多有关衰减和反向散射的数据。使用改进的替代方法（允许使用聚焦换能器），测量了从30到90 MHz时血细胞比容为6％，10％，15％，20％，25％和30％的衰减和反向散射。结果表明，所有悬浮液的衰减系数均随频率线性增加，低血细胞比容悬浮液的反向散射系数最大值在10％至15％之间。在较高的血细胞比容下，观察到频率依赖性降低，这可能表明瑞利散射不再有效，因为VHF范围内的波长与猪RBC的大小相当。

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