N2 - The soft tissue attenuation is an interesting parameter from medical point of view, because the value of attenuation coefficient is often related to the state of the tissue. Thus, the imaging of the attenuation coefficient distribution within the tissue could be a useful tool for ultrasonic medical diagnosis. The method of attenuation estimation based on tracking of the mean frequency changes in a backscattered signal is presented in this paper. The attenuation estimates are characterized by high variance due to stochastic character of the backscattered ultrasonic signal and some special methods must be added to data processing to improve the resulting images. The following paper presents the application of Spatial Compounding (SC), Frequency Compounding (FC) and the combination of both. The resulting parametric images are compared by means of root-mean-square errors. The results show that combined SC and FC techniques significantly improve the quality and accuracy of parametric images of attenuation distribution. L1 - http://www.journals.pan.pl/Content/101479/PDF/10_paper.pdf L2 - http://www.journals.pan.pl/Content/101479 PY - 2014 IS - No 4 EP - 527 DO - 10.2478/aoa-2014-0056 KW - tissue attenuation estimation KW - parametric imaging KW - synthetic aperture KW - spatial compounding KW - frequency compounding A1 - Nowicki, Andrzej A1 - Klimonda, Ziemowit A1 - Litniewski, Jerzy A1 - Karwat, Piotr PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 39 DA - 2014 T1 - Spatial and Frequency Compounding in Application to Attenuation Estimation in Tissue SP - 519 UR - http://www.journals.pan.pl/dlibra/publication/edition/101479 T2 - Archives of Acoustics