http://www.k-wave.org/forum/topic/how-elevational-focus-is-simulated-in-k-wave Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 00:15:41 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/how-elevational-focus-is-simulated-in-k-wave#post-3863 Mon, 19 Aug 2013 15:05:12 +0000 Bradley Treeby 3863@http://www.k-wave.org/forum/ <p>Hi Bo,</p> <p>Thanks for your feedback - it would be interesting to know the reason for the difference. How did you define your circular transducer, or is that not what you mean? Also, what did you compare the results to? If you want to simulate a single element circular transducer, it might be easier to define a circular aperture using <code>makeDisc</code>, and then create an input signal with the appropriate beam forming delays using <code>focus</code>. </p> <p>Brad. </p> http://www.k-wave.org/forum/topic/how-elevational-focus-is-simulated-in-k-wave#post-3853 Thu, 08 Aug 2013 15:22:12 +0000 qiangbo 3853@http://www.k-wave.org/forum/ <p>Brad,</p> <p>I may be wrong but I tried to implement circular focusing transducer with delays, the results do not match up with physical lens. Basically, the focus appears to be broader and displaced a little bit. Maybe it is not a big deal but would like to let you know.</p> <p>Bo </p> http://www.k-wave.org/forum/topic/how-elevational-focus-is-simulated-in-k-wave#post-3850 Thu, 08 Aug 2013 13:17:06 +0000 Bradley Treeby 3850@http://www.k-wave.org/forum/ <p>Hi Bo,</p> <p>Yes, the elevation focus distance is applied with delay. There is small amount of information on how this works in the k-Wave manual on pages 41-42. Essentially, in transmit, the signals driving the individual grid points that make up each transducer element in the z-direction are delayed to give the appropriate elevation focus distance. In receive, the time signals recorded at the individual grid points are similarly delayed before they are averaged to give one signal per transducer element.</p> <p>The functionality of the <code>kWaveTransducer</code> class is quite new, and some of the code is reasonably complex. If you notice any strange behaviour or have any other suggestions, do let us know!</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/how-elevational-focus-is-simulated-in-k-wave#post-3849 Wed, 07 Aug 2013 22:33:53 +0000 qiangbo 3849@http://www.k-wave.org/forum/ <p>Hi, </p> <p>I wonder how the elevational focus is simulated in K-Wave? </p> <p>After a transducer is created by makeTransducer(), if you plot it, it is always plat even with a finite elevation_focus_distance.</p> <p>Is it done with delay? </p>