http://www.k-wave.org/forum/topic/reconstructing-pat-data-from-a-moving-single-element-transducer Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 17:20:21 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/reconstructing-pat-data-from-a-moving-single-element-transducer#post-6214 Sun, 12 Nov 2017 10:23:56 +0000 Bradley Treeby 6214@http://www.k-wave.org/forum/ <p>Perhaps a poor choice of phrase. If it's the same initial pressure distribution, but just sampled with your detector at a different point in space, then this is the normal case for photoacoustic tomography, and you should use a single reconstruction. There are some good review papers on photoacoustics if you need more details, including <a href="http://www.medphys.ucl.ac.uk/research/mle/pdf_files/Review_Roy_Soc_Interface_1.pdf">this one</a>.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/reconstructing-pat-data-from-a-moving-single-element-transducer#post-6213 Fri, 10 Nov 2017 19:16:03 +0000 btshanahan 6213@http://www.k-wave.org/forum/ <p>It's not MxN measurements of the "same data," if I'm understanding the term correctly - the transducer is moving relative to the object between measurements, so each location corresponds to a different initial pressure distribution. </p> http://www.k-wave.org/forum/topic/reconstructing-pat-data-from-a-moving-single-element-transducer#post-6208 Fri, 10 Nov 2017 15:00:47 +0000 Bradley Treeby 6208@http://www.k-wave.org/forum/ <p>If you have taken MxN separate measurements of the same data, these should be reconstructed at the same time, i.e., one call to <code>kspacePlaneRecon</code>, or one time reversal reconstruction.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/reconstructing-pat-data-from-a-moving-single-element-transducer#post-6207 Thu, 09 Nov 2017 06:04:48 +0000 btshanahan 6207@http://www.k-wave.org/forum/ <p>Hi Bradley,</p> <p>I would need to run <code>kspacePlaneRecon</code> NxM times, once for each sensor location, no?</p> <p>Right now the data is in an NxMxNt matrix, but time-reversal presents the same issue - I can't just treat the MxN grid as an array, so I would need to do a time-reversal for each sensor location and then somehow recombine all NxM reconstructed images. </p> http://www.k-wave.org/forum/topic/reconstructing-pat-data-from-a-moving-single-element-transducer#post-6199 Wed, 08 Nov 2017 14:00:57 +0000 Bradley Treeby 6199@http://www.k-wave.org/forum/ <p>Hi Brendan,</p> <p>I might be missing something, but why don't you collate your data into an MxNxNt matrix (where Nt is the number of time points), and then reconstruct your image using <code>kspacePlaneRecon</code> or time reversal? In the latter, you could also account for the size of your detection elements in the reconstruction.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/reconstructing-pat-data-from-a-moving-single-element-transducer#post-6186 Fri, 03 Nov 2017 20:54:34 +0000 btshanahan 6186@http://www.k-wave.org/forum/ <p>I'm working on a project to improve our current PAT system and image-processing routine in particular, and I've hit a wall.</p> <p>We use a 6mm diameter, unfocused, 10 MHz transducer in a raster-scanning configuration in an imaging plane above the object. The issue I'm having is implementing the reconstruction after the data has been collected. In principle, if the imaging surface is a grid with NxM points, then image formation will involve NM separate reconstructions, all of which will then need to be combined to form a single image. And this is assuming that I can treat the initial pressure distribution as uniform throughout the data collection process (this assumption seems reasonable - the irradiation area is large relative to the size of the objects we typically study - but I'm not 100% convinced it's accurate). Then I will need to correct for imaging artifacts that result from the NxM separate limited FOV measurements. All of this seems prohibitively expensive computationally, and severely limited in terms of the accuracy and resolution we could hope to achieve even in the best case scenario.</p> <p>Has anybody implemented accurate single-element raster-scanning PAT imaging systems? I know the setup is common in PAM, but tomography introduces its own set of challenges.</p> <p>Thanks,<br /> Brendan </p>