http://www.k-wave.org/forum/topic/using-layered-media-with-different-shape-in-focused-ultrasound-stimulation Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 11:22:27 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/using-layered-media-with-different-shape-in-focused-ultrasound-stimulation#post-7225 Wed, 12 Feb 2020 15:56:23 +0000 Bradley Treeby 7225@http://www.k-wave.org/forum/ <p>Hi Mattia,</p> <p>The medium properties are assigned as a matrix. In other words, you can assign the properties following any shape. For example, you could create a shell shape by using <code>makeBall</code> or <code>makeDisc</code> with different radii. </p> <p>I'm not sure I follow what you mean by "not solid nor fluids". What else is there?</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/using-layered-media-with-different-shape-in-focused-ultrasound-stimulation#post-7192 Tue, 21 Jan 2020 11:28:12 +0000 mstefano 7192@http://www.k-wave.org/forum/ <p>Dear all, </p> <p>I'm new in k-Wave. I would like to make a transducer ultrasound source and observe the pressure field and intensity in the focus using different media (tissues). From examples and k-Wave user manual, I understood how to make a curved transducer element and define a time varying source (from tvsp transducer field patterns), and from ewp layered medium example, I know how to make and define two layers with different properties. </p> <p>I want to simulate properties of different tissues like water, skull and others, modeling these tissues as spheres and shells in a 3D view or circle and concentric rings in a 2D view.<br /> I know that for solids can be used "Time domain wave propagation in elastic media" (pstdElastic2D or pstdElastic3D) functions and for fluids can be used "Time domain wave propagation in fluid media" (kspaceFirstOrder2D or kspaceFirstOrder3D) functions. </p> <p>So I have some questions about it. </p> <p>i. How can I define different tissues? Where some of these are not solid nor fluids ? </p> <p>ii. I want layered media, not in a linear shape but a sphere and shell shape in 3D or a circle and rings in 2D, and the circle and each ring must have properties of each tissue.<br /> So how can I assign different properties at each concentric ring/shell ? </p> <p>Thanks in advance,</p> <p>Mattia STEFANO </p>