Studies on acoustic tissue characterization with Frequency-Dependent Attenuation.

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In this research project, we studied the frequency-dependent attenuation in the normal liver, spleen,thyroid gland, breast tissue,muscle and brain.On the other hand, some diseases of liver, thyroid gland , breast were studied using the spectral-shift zero-crossing method.1; Frequency,dependent attenuation(FDA) of normal liver:0.55+0.05dB/cm/MHZ2; FDA of normal spleen:0.37+0.06dB/cm/MHz3; FDA of fatty liver:0.81+0.17dB/cm/MHz4; FDA of liver cirrhosis:0.63+0.13dB/cm/MHz5; FDA of chronic hepatitis:0.64+0.12dB/cm/MHz6; FDA of hemangioma of liver:0.35+0.10dB/cm/MHz7; FDA of cellular carcinoma:0.45+0.16dB/cm/MHz8; FDA of metastatic liver carcinoma:0.43+0.15dB/cm/MHz9; FDA of metastatic liver carcinoma from lung:0.38+0.12dB/cm/MHz10; FDA of metastation liver carcinoma from colon:0.50+0.13dB/cm/MHz11; FDA of normal thyroid gland:1.279+0.224dB/cm/MHz12; FDA of normal breast:1.27+0.311dB/cm/MHz13; FDA of chronic thyroiditis:0.824+0.325dB/cm/MHz14; FDA of hyperthyroidism:0.729+0.319dB/cm/MHz15; FDA of adenomatousgoiter:1.002+0.464dB/cm/MHz16; FDA of adenoma:0.438+0.114dB/cm/MHz17; FDA of thyroid papillary carcinoma:0.408+0.187dB/cm/MHz18; FDA of breast carcinoma:1.513+0.452dB/cm/MHz19; FDA of fibroadenoma:1.218+0.536dB/cm/MHz20; FDA of gastrocunemius muscle:at rest0.42+0.13,at contraction0.86+0.32,and at strech0.30+0.14dB/cm/MHz21; FDA of cerebrum:0.37+0.06dB/cm/MHz,cerebellum:0.52+0.14, thalamus:0.50+0.11dB/cm/MHz