http://www.k-wave.org/forum/topic/novice-user-image-optimisation-problem Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 23:27:51 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/novice-user-image-optimisation-problem#post-7439 Mon, 27 Apr 2020 07:43:43 +0000 vich 7439@http://www.k-wave.org/forum/ <p>If you have the Signal Processing Toolbox, you can use several functions already built into MATLAB such as <code>sin</code>, <code>sawtooth</code> and <code>square</code> to create your time-varying input signal (<code>source.p</code>). You could also experiment with <code>pulstran</code> plus one of <code>tripuls</code>, <code>rectpuls</code> and <code>gauspuls</code>, or with certain functions from the Statistics and Machine Learning Toolbox such as <code>normpdf</code>, <code>raylpdf</code>, <code>poisspdf</code>, etc. (this is obviously an "off-label" use of such sophisticated functions). The possibilities are endless. After defining a new input signal, just rerun your k-Wave simulations and use some quality metric (this could be your visual inspection) to assess the results.</p> <p>Please notice that simulating, say, a sawtooth <em>pressure</em> waveform is quite different from electrically driving an actual transducer with a sawtooth signal. </p> http://www.k-wave.org/forum/topic/novice-user-image-optimisation-problem#post-7437 Sat, 25 Apr 2020 21:17:48 +0000 up809940 7437@http://www.k-wave.org/forum/ <p>Hello,<br /> I am a first time user of K-wave, and a 3rd year Physics Undergraduate. I am having a lot of difficulties with k-wave (I am an experimental student, and due to COVID-19 I cannot run my experiment in the lab, so am attempting to simulate it).</p> <p>My project is to attempt to vary the input signal for any type of standard transducer to produce square, triangular and asymmetric wave pulses instead of sinusoidal. I want to see how this will affect the overall image quality for two phantoms in generated B-mode images. </p> <p>I am currently trying to work through the 'defining an ultrasound transducer' examples. I am looking for a clear explanation on how to do the above easily, and maybe some regular support from an experienced user (if kind enough), so I may ask any related questions. </p> <p>Thank you so much,<br /> Kind regards,</p> <p>Adam A </p>