ULTRASONIC ATTENUATION AND PROPAGATION SPEED IN MAMMALIAN TISSUES AS A FUNCTION OF TEMPERATURE
ULTRASONIC ATTENUATION AND PROPAGATION SPEED IN MAMMALIAN TISSUES AS A FUNCTION OF TEMPERATURE
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DOI：
10.1016/0301-5629(79)90083-8
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发表时间：
1979-01-01
影响因子：
2.9
通讯作者：
HILL C R
中科院分区：
文献类型：
--
作者：
BAMBER J C;HILL C R
在5 - 65 °范围内的各种温度下，在新鲜和固定的牛和人类软组织中通过实验确定频率范围1-7 MHz的超声衰减和声速。C.在低于40 ℃的温度下，对于固定的和新鲜的组织，衰减系数的表现类似;在高频下，衰减系数对温度有负的依赖性，在20 ℃时的值为0.001。C比在37 ℃时高约21%。C.随着频率的降低，衰减的温度系数逐渐降低，直到通过过渡频率（随组织样本而变化，但为1-2 MHz），其中观察到对温度的正相关性。在高于约40 ℃的温度下，新鲜离体组织的衰减系数随温度升高而增大。固定组织衰减系数继续降低。非脂肪组织中的声速随温度而增加，并在约50 ℃时表现出最大值。C，而对于脂肪组织，观察到负相关性。这一结果的影响，以改善诊断程序进行了讨论。
Ultrasonic attenuation in the frequency range 1-7 MHz, and the speed of sound were determined experimentally in fresh and fixed bovine and human soft tissues for various temperatures in the range 5-65.degree. C. At temperatures below 40.degree. C the attenuation coefficient behaved similarly for fixed and fresh tissues; at high frequencies it had a negative dependence on temperature, the value at 20.degree. C was about 21% higher than at 37.degree. C. As the frequency was reduced the temperature coefficient of attenuation progressively decreased until passing a transition frequency (varied with the tissue specimens but was 1-2 MHz) where a positive dependence on temperature was observed. At temperatures above about 40.degree. C the attenuation coefficient of freshly excised tissues increased with temperature. The fixed tissue attenuation coefficient continued to decrease. The speed of sound in non-fatty tissues increases with temperature and exhibits a maximum at around 50.degree. C, while for fatty tissues a negative dependence is observed. The implications of this result for improved diagnositc procedures was discussed.