http://www.k-wave.org/forum/topic/spectral-aliasing-of-reconstructed-images Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 00:22:28 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/spectral-aliasing-of-reconstructed-images#post-8523 Sat, 30 Apr 2022 02:29:21 +0000 Liangkeke 8523@http://www.k-wave.org/forum/ <p>Hi Ben,</p> <p> Thanks for your answer！For the first question,the spectral aliasing of reconstructed images I have been solved,because the initial sound pressure source is undersampled.And for the second question, I'll think about the modeling.</p> <p>Best Regards<br /> Liangkeke </p> http://www.k-wave.org/forum/topic/spectral-aliasing-of-reconstructed-images#post-8502 Mon, 25 Apr 2022 18:53:32 +0000 bencox 8502@http://www.k-wave.org/forum/ <p>Hi Liangkeke,</p> <p>I'm afraid I don't understand what the aliasing issue is that you're facing. Also, k-Wave doesn't model the laser irradiation in photoacoustics nor the Grüneisen parameter. It starts with the initial pressure distribution.</p> <p>Best wishes<br /> Ben </p> http://www.k-wave.org/forum/topic/spectral-aliasing-of-reconstructed-images#post-8459 Mon, 21 Feb 2022 13:57:15 +0000 Liangkeke 8459@http://www.k-wave.org/forum/ <p>Hi Bradley,</p> <p>Thanks for your reply.After reading photoacoustic examples,I added source.p0 = smooth(source.p0,true) in my MATLAB program,and I tried to adjust the value of dt Nt to change the sampling frequency,the imaging results still aliasing.I don't know why this happens.I want to try to reproduce part speckle illumination imaging of this article(https://aip.scitation.org/doi/10.1063/1.5113476).Do you have some more detailed suggestions to solve imaging aliasing？</p> <p>And I have another question.In linear photoacoustic,incident laser(Gaussian) and radiation area keep invariant，photoacoustic conversion efficiency is a constant.And now,I just change the incident laser to Gaussian speckle light，the results in simulation,I found that calculating the photoacoustic conversion efficiency of each different speckle is different,I am quite confused.</p> <p>Sincerely look forward to your answer.<br /> Lkk </p> http://www.k-wave.org/forum/topic/spectral-aliasing-of-reconstructed-images#post-8444 Tue, 01 Feb 2022 10:12:33 +0000 Bradley Treeby 8444@http://www.k-wave.org/forum/ <p>Hi Lkk,</p> <p>I'm not sure I follow exactly. Keep in mind that k-Wave will smooth the initial pressure distribution, so make sure you're comparing with the smoothed source (see the included photoacoustic examples for more details).</p> <p>Brad </p> http://www.k-wave.org/forum/topic/spectral-aliasing-of-reconstructed-images#post-8429 Mon, 17 Jan 2022 15:11:03 +0000 Liangkeke 8429@http://www.k-wave.org/forum/ <p>Hello，<br /> I set source.p0 as initial sound pressure source，and I try make use of new reconstruction algorithm,but I found when the sound pressure source is in a grid ,the image is complete，but the initial source is in more grids,pectrum aliasing in image. Can anyone tell me why and how to deal with this？</p> <p> Lkk </p>