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In the frequency range 2—9.3 MHz and temperature range 5—40℃,ultrasonic attenuationcoefficients of five normal tissues and three abnormal tissues excised from five people were measuredin vitro by means of pulse transmission technique.The dependences of ultrasonic attenuation uponfrequency and temperature were investigated and much attention was paid to ultrasonic attenuation ofabnormal tissues.Comparison between ultrasonic attenuation coefficients of normal and abnormaltissues show that the ultrasonic attenuation in abnormal tissue is higher than that in normal tissue.Conclusions on the experimental results were given. 相似文献