http://www.k-wave.org/forum/topic/about-the-attenuation-coefficient-alpha Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 01:24:28 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/about-the-attenuation-coefficient-alpha#post-4573 Thu, 12 Jun 2014 14:58:27 +0000 Bradley Treeby 4573@http://www.k-wave.org/forum/ <p>Hi cge,</p> <p>Yes, <code>medium.alpha_coeff</code> can be heterogeneous, i.e., defined as a matrix. In your example using <code>makeDisk</code>, the attenuation coefficient will be set to A within the disk, and zero everywhere else. However, you can create the matrix for <code>alpha_coeff</code> in any way you like, for example, having different values in different parts of the medium.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/about-the-attenuation-coefficient-alpha#post-4570 Wed, 11 Jun 2014 23:09:29 +0000 cge 4570@http://www.k-wave.org/forum/ <p>Hi everyone</p> <p>I am trying some simulation in hetrogeneous media. However,in the example, it doesn't mention if the alpha_coefficient, the attenuation coefficient can also be modified for different part of the computational domain as the density and speed </p> <p>In other guys post, they define the alpha-coefficient as: media_alpha_coe=makedisk(Nx,Ny,x0,y0)*A(A refers to any constant)</p> <p>It is clear that makedisk and other geometric functions will return a matrix. Then, for the example above, will the attenuation only be A for the places that is set to '1' by the maskdisk function above??? </p>