http://www.k-wave.org/forum/topic/kwavearray-creating-a-cylindrical-surface-area-in-3d Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 23:38:56 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/kwavearray-creating-a-cylindrical-surface-area-in-3d#post-8676 Tue, 29 Nov 2022 11:24:28 +0000 maximilian.s.bader@tum.de 8676@http://www.k-wave.org/forum/ <p>Hello Mr. Treeby,</p> <p>I'm terribly sorry. Instead of passing the transducer surface points to <code>addCustomelement</code>, I passed the sensor mask with size of the Grid.</p> <p>Sorry for the inconvenience and your quick response! </p> http://www.k-wave.org/forum/topic/kwavearray-creating-a-cylindrical-surface-area-in-3d#post-8674 Mon, 28 Nov 2022 16:25:32 +0000 Bradley Treeby 8674@http://www.k-wave.org/forum/ <p>I was able to run your code snippet without errors (renaming <code>width_elem_half</code> to <code>width_half_elem</code> and adding <code>karray = kWaveArray</code>). It adds a 2D element (<code>karray.elements{1}.dim</code>) into a transducer for a 3D simulation (<code>karray.dim</code>). Can you clarify which bit you're stuck on? </p> http://www.k-wave.org/forum/topic/kwavearray-creating-a-cylindrical-surface-area-in-3d#post-8671 Sun, 27 Nov 2022 11:05:27 +0000 maximilian.s.bader@tum.de 8671@http://www.k-wave.org/forum/ <p>Dear all,</p> <p>I just checked out the new kWaveArray class to model sensor surfaces without artifacts (new in version 1.4).<br /> I intended to a cylindrical surface to a 3D simulation. As this does not match any of the predefined transducer shapes, I wanted to add a custom shape. However, when I try to add the surface as CustomElement, I cannot set the dimension to 2, because I pass 3D surface positions. In the implementation of kWaveArray, I can see that for bowls the dimension is still set to 2 and then a custom method to create the surface accordingly is called to return the grid points. Is there any possibility to define such a transducer surface as kWaveArray in 3D or without major changes in the kWaveArray class?</p> <p>Thanks a lot for any help!</p> <p>Code<br /> <pre><code>%% Define Transducer params width_half_elem = 5e-4; arclength_elem_half = 2e-3; radius_single_elem = 1e-2; res_min = 100e-6; upsampling_factor = 2; %% Discretize the transducer size_integration_area = arclength_elem_half * width_elem_half * 4; angle_step_max = asin(res_min/upsampling_factor/radius_single_elem); num_angle_steps_half = round((arclength_elem_half/radius_single_elem/angle_step_max)); num_width_steps_half = round(width_half_elem/(res_min/upsampling_factor)); [width_surface_discr_transd,angles_surface_discr_transd] = ... meshgrid((-num_width_steps_half:num_width_steps_half)*(res_min/upsampling_factor),... (-num_angle_steps_half:num_angle_steps_half)*angle_step_max); num_discr_points = numel(width_surface_discr_transd); width_surface_discr_transd = reshape(width_surface_discr_transd,[1 num_discr_points]); angles_surface_discr_transd = reshape(angles_surface_discr_transd,[1 num_discr_points]); array_elems = [width_surface_discr_transd; radius_single_elem *sin(angles_surface_discr_transd); radius_single_elem *(1-cos(angles_surface_discr_transd))]; karray.addCustomElement(array_elems, size_integration_area, 2, &#39;Custom_Transducer_Cyl&#39;);</code></pre> <p>Resulting error message:<br /> <pre><code>Error using addCustomElement Expected input number 1, integration_points, to be two-dimensional. Error in kWaveArray/addCustomElement (line 608) validateattributes(integration_points, {&#39;numeric&#39;}, {&#39;finite&#39;, &#39;real&#39;, &#39;2d&#39;}, &#39;addCustomElement&#39;, &#39;integration_points&#39;,1);</code></pre>