http://www.k-wave.org/forum/topic/unwanted-pressure-oscillation Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 22:31:01 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/unwanted-pressure-oscillation#post-9134 Wed, 28 Aug 2024 18:35:27 +0000 bencox 9134@http://www.k-wave.org/forum/ <p>Hi a_floquet,</p> <p>What kind of input function are you using? Have you done a convergence test, ie. reducing <code>dx</code> and <code>dt</code> until the output converges? If that doesn't help please could you post a version of your simulation highlighting the issue in the absence of a scatterer.</p> <p>Best wishes<br /> Ben </p> http://www.k-wave.org/forum/topic/unwanted-pressure-oscillation#post-9076 Mon, 15 Apr 2024 09:01:05 +0000 a_floquet 9076@http://www.k-wave.org/forum/ <p>Hello,</p> <p>I am using k-wave to simulate ultrasound echography. Among other things, I wish to simulate a PSF.<br /> I work in 2D, so I don't use the transducer class, I instead "manually" place my elements and delay to create my probe. However, did test in 3D using the transducer class and my problem remained the same.</p> <p>My problem is that they are unwanted pressure oscillation in the received signal. My sensor is, of course, at the same position as my emiiting elements. These oscillations happens even when propagating a wave in an perfectly homogeneous medium, without any scatterer at all.</p> <p>If my understanding is correct, this is due to the finite length FFT used to compute spatial gradient, as described in section 2.8 "Smoothing and the Band-Limited Interpolant" of the user manual. Whatever option I use for the 'smooth' optionnal input parameter, this problem persists. </p> <p>My question is then : is there any other way to mitigate this issue ? I assume that with enough smoothing I could get rid of the oscillation, but my results would not be accurate anymore ?</p> <p>Thanks in advance </p>