http://www.k-wave.org/forum/topic/time-problem-grid-size Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 14:15:54 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/time-problem-grid-size#post-5914 Mon, 08 May 2017 07:35:15 +0000 Maschbau 5914@http://www.k-wave.org/forum/ <p>Hi Brad,</p> <p>thank you for the answer.<br /> I saw the difference in time of flight by plotting the a-scans (recorded at the same receiver) in the same figure using different grid sizes.</p> <p>Best</p> <p>Torben </p> http://www.k-wave.org/forum/topic/time-problem-grid-size#post-5905 Wed, 26 Apr 2017 20:17:30 +0000 Bradley Treeby 5905@http://www.k-wave.org/forum/ <p>Hi Torben,</p> <p>It's hard to say exactly without seeing your code, but depending on how you have defined the source, the change in amplitude with the grid spacing might be expected. See <a href="http://www.k-wave.org/forum/topic/pressure-depending-on-number-of-gridpoints">this post</a> and <a href="http://www.k-wave.org/forum/topic/mesh-grid-size-problem">this post</a>.</p> <p>For the time of flight, how is this extracted?</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/time-problem-grid-size#post-5895 Tue, 18 Apr 2017 10:34:50 +0000 Maschbau 5895@http://www.k-wave.org/forum/ <p>Hello everybody,</p> <p>I have created a simulation of an echo pulse test (5 MHz) in k-wave. I used different element sizes (10 - 40 um) and time steps (3 - 12 ns). Unfortunately, I have noticed that the TOF changes in the range of almost 5% and the amplitudes by up to 40%.<br /> I use the following solver: kspaceFirstOrder2D<br /> Had someone similar problems or know what the error can be?</p> <p>Many Thanks</p> <p>Torben </p>