http://www.k-wave.org/forum/topic/kspacesfirstorder3d-code-seems-not-to-get-medium-density Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 23:27:52 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/kspacesfirstorder3d-code-seems-not-to-get-medium-density#post-7471 Sun, 03 May 2020 02:29:25 +0000 aliataie 7471@http://www.k-wave.org/forum/ <p>I am really thankful of your hint. </p> http://www.k-wave.org/forum/topic/kspacesfirstorder3d-code-seems-not-to-get-medium-density#post-7469 Sat, 02 May 2020 20:29:16 +0000 vich 7469@http://www.k-wave.org/forum/ <p>From a user's perspective, according to the k-Wave Manual v.1.1, section 3.3:</p> <blockquote><p> Except for the power law absorption exponent (which must be a scalar), each of the material properties can be defined as either a scalar (if the medium property is homogeneous), or a matrix (if the medium property is heterogeneous). If the parameters are heterogeneous, the input matrix must be the same size as the computational grid, for example:</p> <p><code><br /> % create a heterogeneous sound speed for a layered medium in 3D<br /> medium.sound_speed = 1500*ones(kgrid.Nx, kgrid.Ny, kgrid.Nz);<br /> medium.sound_speed(1:layer_size, :, :) = 1600;<br /> </code> </p></blockquote> <p>The manual is, in my opinion, the most solid way to get started with k-Wave, and the examples greatly complement it. If you <em>really</em> want to start off by inspecting the code directly, please bear in mind that many k-Wave functions make calls to hidden routines (functions and scripts) in the <code>private/</code> folder. These calls can be easy to miss if you read the code without knowing what to look for. </p> http://www.k-wave.org/forum/topic/kspacesfirstorder3d-code-seems-not-to-get-medium-density#post-7468 Sat, 02 May 2020 09:19:36 +0000 aliataie 7468@http://www.k-wave.org/forum/ <p>Dear all,<br /> I am new with k-wave. I started with the ultrasound b-mode example which calls "kspaceFirstOrder3D" and feeds the properties of the heterogeneous medium via fields of "medium", specially: medium.density. But when opened kspaceFirstOrder3D, I did not find anywhere in the code, reading the density of medium. Am I making a mistake? If not, so how does it account for non-homogeneous mediums? </p>