http://www.k-wave.org/forum/topic/staircase-problem Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 02:27:22 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/staircase-problem#post-8096 Thu, 25 Mar 2021 16:54:31 +0000 Bradley Treeby 8096@http://www.k-wave.org/forum/ <p>I think you could use the <code>kWaveArray</code> class for this, yes. </p> http://www.k-wave.org/forum/topic/staircase-problem#post-8061 Wed, 10 Feb 2021 21:11:36 +0000 Andrea Addison 8061@http://www.k-wave.org/forum/ <p>Bradley,</p> <p>I understand. My goal is to design a sparse hemispherical ultrasound phased array. Basically, I am planning to remove half of the elements given this transducer: <a href="https://imgur.com/a/R5R4GqR" rel="nofollow">https://imgur.com/a/R5R4GqR</a> and driving the remaining elements with a long tone burst. The individual elements are flat piston transducers and the center frequency of the transducer is 1 MHz. I was wondering the kWaveArray is suitable for this purpose. or Do you recommend any other classes in k-Wave for this transducer design?</p> <p>Best regards,<br /> Andrea </p> http://www.k-wave.org/forum/topic/staircase-problem#post-7997 Tue, 19 Jan 2021 19:28:35 +0000 Bradley Treeby 7997@http://www.k-wave.org/forum/ <p>Hi Andrea,</p> <p>For this paper, I wanted to use the same approach for both planar and focused transducers. They were defined using <code>makeArc</code> and the position rotated as shown in the paper. You are right that staircasing will have an effect on both the beam pattern and the amplitude (although the sampling was pretty high and these errors are the same for the simulations with and without elastic waves). The best approach now would be to use the <a href="http://www.k-wave.org/forum/topic/alpha-version-of-kwavearray-off-grid-sources">kWaveArray</a> class which eliminates staircasing arfectacts altogether.</p> <p>Brad </p> http://www.k-wave.org/forum/topic/staircase-problem#post-7991 Sun, 27 Dec 2020 19:08:55 +0000 Andrea Addison 7991@http://www.k-wave.org/forum/ <p>Hello Dr.Treeby,</p> <p>I want to use a plane piston transducer with incidence angles at different degrees. When I use an angled transducer mask, I observe some staircase issue which doesn't represent angled transducer accurately. Then I encountered this example (<a href="http://www.k-wave.org/documentation/example_tvsp_steering_linear_array.php#heading2)" rel="nofollow">http://www.k-wave.org/documentation/example_tvsp_steering_linear_array.php#heading2)</a>. I think this might be a good solution but I was wondering why you wouldn't prefer to use the steering method in your study: "The contribution of shear wave absorption to ultrasound heating in bones: Coupled elastic and thermal modeling". Do you think that the physical mask and electronic steering are different representations?</p> <p>Best regards,<br /> Andrea </p>