http://www.k-wave.org/forum/topic/heterogeneous-medium-simulation Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 23:07:19 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/heterogeneous-medium-simulation#post-124 Thu, 24 Mar 2011 09:19:17 +0000 ChiaChin Li 124@http://www.k-wave.org/forum/ <p>Hi Bradley,</p> <p>After replace the kspaceFirstOrder_filterSensorData.m file, it can work as I expect.</p> <p>Thank you very much!</p> <p>Best Regard.<br /> Chia-Chin </p> http://www.k-wave.org/forum/topic/heterogeneous-medium-simulation#post-123 Thu, 24 Mar 2011 08:19:37 +0000 Bradley Treeby 123@http://www.k-wave.org/forum/ <p>Hi Chia-Chin,</p> <p>It seems there is a bug in <code>kspaceFirstOrder_filterSensorData</code> when <code>kgrid.t_array</code> has an odd number of time points. You can download an updated version from here:</p> <p><a href="http://www.k-wave.org/downloads/kspaceFirstOrder_filterSensorData.m">kspaceFirstOrder_filterSensorData.m</a></p> <p>Try downloading the function and replacing the existing one in the private folder in the k-Wave Toolbox. Alternatively, as a work around you could force <code>kgrid.t_array</code> to have an even number of time points.</p> <p>Let me know if this fixes the problem for you.</p> <p>Thanks,</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/heterogeneous-medium-simulation#post-122 Thu, 24 Mar 2011 06:26:41 +0000 ChiaChin Li 122@http://www.k-wave.org/forum/ <p>Hi Bradley,</p> <p>I do simulation modified from eterogeneous Propagation Medium Example. And I use MATLAB 7.10.0 (R2010a) and k-Wave toolbox b03.</p> <p>I tried adding the line you said</p> <p>sensor.frequency_response = [2e6, 100];</p> <p>to Heterogeneous Propagation Medium Example. It could work successfully.<br /> And I tried to add those lines:</p> <p>fs = 200e6; % [Hz]<br /> dt = 1/fs;<br /> t_end = 604*2*dt;<br /> kgrid.t_array = 0:dt:t_end;</p> <p>to fix sampling rate. Then the error showed up again. In the Heterogeneous Propagation Medium Example, the size of sensor_data is 50x608. And one of the line I mention before:</p> <p>t_end = 604*2*dt;</p> <p>Once the number multiply dt over 607, the error will occur. But I need longer kgrid.t_array to record the simulation result.<br /> Hope you can help me to solve those problem.</p> <p>Thanks!<br /> Chia-Chin </p> http://www.k-wave.org/forum/topic/heterogeneous-medium-simulation#post-120 Wed, 23 Mar 2011 22:04:30 +0000 Bradley Treeby 120@http://www.k-wave.org/forum/ <p>Hi Chia-Chin,</p> <p>Thanks for your post. Are you doing a simulation in 1, 2, or 3D? What are your inputs? What version of MATLAB and k-Wave are you using?</p> <p>If you try adding the line</p> <p><code>sensor.frequency_response = [2e6, 100];</code></p> <p>to the Initial Value Problems -&gt; Heterogeneous Propagation Medium Example just before running the simulation, do you also get the same error?</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/heterogeneous-medium-simulation#post-119 Wed, 23 Mar 2011 08:15:10 +0000 ChiaChin Li 119@http://www.k-wave.org/forum/ <p>hi,</p> <p>I want to make a heterogeneous medium simulation with sensors of Gaussian freq response. but once i add sensor.frequency_response into my simulation, there will be a error about dimensions mismatch:<br /> Error in ==&gt; kspaceFirstOrder_filterSensorData at 41<br /> sensor_data = fft(sensor_data, [], 2).*repmat([gauss, flipud(gauss)], length(sensor_data(:, 1)), 1);<br /> Could you tell me how to solve this problem?</p> <p>Thanks a lot!<br /> Chia-Chin </p>