http://www.k-wave.org/forum/topic/first-get-through-example Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 01:24:31 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/first-get-through-example#post-4677 Mon, 18 Aug 2014 17:13:15 +0000 Bradley Treeby 4677@http://www.k-wave.org/forum/ <p>Hi Farhad,</p> <p>It's certainly possible to simulate diagnostic US images with k-Wave. However, the full-wave nature of the simulations means the computational expense is reasonably high. You can get started by looking at the "Diagnostic Ultrasound Simulation" examples included in the html help with the toolbox.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/first-get-through-example#post-4650 Sun, 20 Jul 2014 06:20:41 +0000 f4rhad 4650@http://www.k-wave.org/forum/ <p>This is what I want to do:<br /> <a href="http://8pic.ir/images/uo48la69a8k8cuxlcn27.jpg" rel="nofollow">http://8pic.ir/images/uo48la69a8k8cuxlcn27.jpg</a></p> <p>but I do not want to add gaussian noise this way!<br /> I want to add the normal noise of ultrasound transducer(speckle) with simulation of sonography.</p> <p>-BR<br /> Farhad </p> http://www.k-wave.org/forum/topic/first-get-through-example#post-4649 Sun, 20 Jul 2014 05:17:16 +0000 f4rhad 4649@http://www.k-wave.org/forum/ <p>Dear Brad,<br /> Hi<br /> That helped a lot I had a dt.m in an obsolete folder of snake algorithm. I removed it from the Path and it`s working awesome .</p> <p>may I add a question related why i started using k-wave?<br /> -I wanted to add speckle noise to a synthetic image. I got desperate doing that with Field II! Is it possible with K-wave?</p> <p>Sincerely,<br /> Farhad </p> http://www.k-wave.org/forum/topic/first-get-through-example#post-4646 Thu, 17 Jul 2014 13:08:46 +0000 Bradley Treeby 4646@http://www.k-wave.org/forum/ <p>Hi f4rhad,</p> <p>Do you have a user function somewhere called <code>dt</code>? It seems there is an issue with MATLAB deciding about the scope of the variable <code>dt</code> used in the code and your function with the same name. You could correct this by:<br /> (1) declaring <code>dt = 0</code> at the beginning of <code>kspaceFirstOrder2D</code><br /> (2) replacing <code>dt</code> in <code>kspaceFirstOrder2D</code> with <code>kgrid.dt</code><br /> (3) renaming your <code>dt</code> function or removing it from the path.</p> <p>Hope that helps,</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/first-get-through-example#post-4644 Wed, 16 Jul 2014 18:32:52 +0000 f4rhad 4644@http://www.k-wave.org/forum/ <p>I tried to simulate the first example and I did not touch anything else to ruin them,<br /> but these errors come up usually</p> <p>Error using dt (line 13)<br /> Not enough input arguments.</p> <p>Error in kspaceFirstOrder2D (line 484)<br /> disp([' dt: ' scaleSI(dt) 's, t_end: ' scaleSI(t_array(end)) 's, time steps: ' num2str(length(t_array))]);</p> <p>I guess thats because in main script this line is used without arguments while it needs an input like B!<br /> -----------------<br /> function D = dt(B)<br /> -----------------<br /> line 484: disp([' dt: ' scaleSI(dt) 's, t_end: ' scaleSI(t_array(end)) 's, time steps: ' num2str(length(t_array))]); </p>