http://www.k-wave.org/forum/topic/pa-recontruction-for-a-certain-range-of-depth Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 00:22:31 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/pa-recontruction-for-a-certain-range-of-depth#post-8220 Wed, 16 Jun 2021 22:22:55 +0000 bencox 8220@http://www.k-wave.org/forum/ <p>Hi ml414,</p> <p>It sounds as though you want to do what the seismic community call re-datuming, adjusting your data so that it is as if it were recorded at different sensor positions. If you have a planar transducer then you can use the function <code>angularSpectrum</code> to do that. For other array geometries it's not so straightforward, although I do recall seeing a paper, or talk perhaps, doing it with a hemi-spherical array (although frustratingly I can't find the paper now).</p> <p>Rather than use time reversal, which reconstructs the whole field for all time steps, you could reconstruct the photoacoustic image using a different type of approach. With some approaches, eg. backprojection formulas or matrix-based approaches, you could reconstruct just the region you're interested in.</p> <p>Best wishes<br /> Ben </p> http://www.k-wave.org/forum/topic/pa-recontruction-for-a-certain-range-of-depth#post-8149 Fri, 14 May 2021 01:21:14 +0000 ml414 8149@http://www.k-wave.org/forum/ <p>Hi Dr Treeby,</p> <p>I have been using time-reversal in kwave for our real-world data and it works great. But in our experimental setup, we have a 20 mm distance of empty space (filled with coupling medium) from the transducer surface to the targeted region along the axial direction. Is there a way we can skip the recon for the empty region, but only reconstruct the targeted region so that potentially the recon speed can be accelerated (since a smaller region is reconstructed)? I've tried to cut kgrid.t_array and sensor_data, but it says t_array can only start from 0. </p> <p>Thank you! </p>