sins Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 03:11:50 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/model-based-image-reconstruction#post-6182 Tue, 31 Oct 2017 19:26:29 +0000 Osman 6182@http://www.k-wave.org/forum/ <p>Moein,</p> <p>Another article which you might find helpful, also by Anastasio et al., is "An Imaging Model Incorporating Ultrasound Transducer Properties for Three-Dimensional Optoacoustic Tomography," IEEE Transactions on Medical Imaging, Vol. 30, No. 2, Feb 2011.</p> <p>Best,<br /> Osman </p> http://www.k-wave.org/forum/topic/model-based-image-reconstruction#post-5692 Thu, 29 Sep 2016 14:12:44 +0000 bencox 5692@http://www.k-wave.org/forum/ <p>Hi Moein,</p> <p>You could in theory build the matrix laboriously by putting point sources at every point, one-after-another, and measuring the response everywhere for all times, and putting those measured 'Green's functions' into a matrix. Not sure what the point of that would be though. The matrix would likely be huge. As I mentioned before, Mark Anastasio's group have written a paper on constructing a matrix version of the forward model that k-Wave is based. See Huang, Chao, et al. "Full-wave iterative image reconstruction in photoacoustic tomography with acoustically inhomogeneous media." IEEE transactions on medical imaging 32.6 (2013): 1097-1110. There has also been work in this area by the group of Daniel Razansky in Munich. They use a different discrete model but it is matrix based. </p> <p>Best wishes,</p> <p>Ben </p> http://www.k-wave.org/forum/topic/model-based-image-reconstruction#post-5670 Fri, 09 Sep 2016 22:36:21 +0000 Moein0114 5670@http://www.k-wave.org/forum/ <p>Dear Dr. Cox<br /> thanks for your help. as you mentioned there are some cases that are working with matrix formulation of the forward model. this is my goal. I want to have the forward matrix model and use iterative minimization approach. how can I have the forward model matrix in k-Wave? is it even possible?<br /> best<br /> Moein Mozaffarzadeh </p> http://www.k-wave.org/forum/topic/model-based-image-reconstruction#post-5669 Fri, 09 Sep 2016 21:35:37 +0000 bencox 5669@http://www.k-wave.org/forum/ <p>Hi Moein,</p> <p>Yes, you can use k-Wave as a forward model for model-based image reconstruction, although the most general image reconstruction algorithm incorporated directly into k-Wave is time reversal. There are some examples describing that. 'Model-based' image reconstruction is not a very specific term - all image reconstruction techniques are based on models of the acoustic propagation, although they are not always explicitly stated as such. Sometimes it is used to describe an approach where a matrix formulation of the forward model is used in an iterative minimisation-based reconstruction. Whether or not that is feasible depends on the size of the problem you are tackling. A related approach that doesn't use matrices is based on adjoint equations. Anastasio has done some good work on this recently. The adjoint for k-Wave's forward model is not yet incorporated into the code, but there is a paper that includes a description of how you can do it using the existing toolbox here: <a href="http://arxiv.org/abs/1602.02027">arxiv.org/abs/1602.02027</a></p> <p>Hope that helps.<br /> Ben </p> http://www.k-wave.org/forum/topic/model-based-image-reconstruction#post-5646 Mon, 22 Aug 2016 11:58:31 +0000 Moein0114 5646@http://www.k-wave.org/forum/ <p>Hi Dr. Treeby and Dr. Cox<br /> I am using k-wave toolbox to generate my data set and use this data for image reconstruction.<br /> I did it by analytical algorithm like back projection.<br /> I want to use model-based algorithm to reconstruct absorption so for each iteration of model based algorithm i need to simulate forward model to generate pressure signals from corresponding optical absorption.<br /> is it possible to run the forward model for model-based image reconstruction?<br /> best<br /> Moein Mozaffarzadeh </p>