http://www.k-wave.org/forum/topic/synthetic-aperture-image-reconstruction Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 17:24:29 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/synthetic-aperture-image-reconstruction#post-6235 Tue, 12 Dec 2017 22:44:11 +0000 Bradley Treeby 6235@http://www.k-wave.org/forum/ <p>Hi Dena,</p> <p>Yes, this is the correct way to set the sampling frequency directly. Have you tried checking the CFL value that results, where CFL = c*dt/dx ? If the value is much bigger than about 0.3 (the default used in <code>makeTime</code>), then you might want to consider increasing your sampling frequency.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/synthetic-aperture-image-reconstruction#post-6220 Thu, 23 Nov 2017 01:20:59 +0000 Dena.mnj 6220@http://www.k-wave.org/forum/ <p>Hello,</p> <p>I have developed a synthetic aperture simulation code by modifying the B-mode example. To define the time array I used the "set.Time" function as oppose to "Make.Time" while the former allows me to set the sampling frequency. </p> <p>% create the time array<br /> fs=20.83e6; % Hz<br /> dt= 1/fs; % [s]<br /> Nt=3000;<br /> kgrid.setTime(Nt, dt)</p> <p>I used the delay and sum image reconstruction method using the fs value to form an image. My simulated phantom is similar to the B-mode example. However my images are not clear and has major artifacts. The reconstruction algorithm was previously validated so the issue should be some sort of discrepancy between the simulation and reconstruction.</p> <p>I was wondering if this was a correct approach to define the time array or if you have any other comments/suggestions.</p> <p>Thank you in advance,</p> <p>Dena </p>