http://www.k-wave.org/forum/topic/using-non-circular-sensors-for-time-reversal-reconstruction Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 23:09:13 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/using-non-circular-sensors-for-time-reversal-reconstruction#post-4609 Tue, 01 Jul 2014 17:47:58 +0000 Bradley Treeby 4609@http://www.k-wave.org/forum/ <p>Hi Hamid,</p> <p>For time reversal image reconstruction, the model needs to know the time step between the data points. This is specified using <code>kgrid.t_array</code>. For the forward simulation, if you leave this set to <code>&#39;auto&#39;</code> (the default), the simulation code will automatically set this to something sensible. However, in the reconstruction, you must define this explicitly to match the forward problem (or experimental acquisition settings). There is some information on how to do this in Sec. 3.2 of the <a href="http://www.k-wave.org/documentation.php">k-Wave User Manual</a>.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/using-non-circular-sensors-for-time-reversal-reconstruction#post-4605 Tue, 01 Jul 2014 04:12:44 +0000 Hamid 4605@http://www.k-wave.org/forum/ <p>Hello,</p> <p>I generated some data using </p> <p>kspaceFirstOrder2D(kgrid, medium, source, sensor, input_args{:})</p> <p>Then I used the same function to reconstruct the image as follow:</p> <p>source.p0 = 0;<br /> sensor.time_reversal_boundary_data = sensor_data;<br /> p0_recon = kspaceFirstOrder2D(kgrid, medium, source, sensor, input_args{:});</p> <p>The following error message showed up:</p> <p>Error using kspaceFirstOrder_inputChecking (line 638)<br /> kgrid.t_array must be given explicitly in time reversal mode </p> <p>Thanks,<br /> Hamid </p> http://www.k-wave.org/forum/topic/using-non-circular-sensors-for-time-reversal-reconstruction#post-4344 Tue, 25 Feb 2014 14:33:49 +0000 Bradley Treeby 4344@http://www.k-wave.org/forum/ <p>Glad you got it sorted! </p> http://www.k-wave.org/forum/topic/using-non-circular-sensors-for-time-reversal-reconstruction#post-4340 Mon, 24 Feb 2014 02:45:00 +0000 SHickling 4340@http://www.k-wave.org/forum/ <p>Sorry never mind, my mistake! </p> http://www.k-wave.org/forum/topic/using-non-circular-sensors-for-time-reversal-reconstruction#post-4339 Sun, 23 Feb 2014 22:30:21 +0000 SHickling 4339@http://www.k-wave.org/forum/ <p>Hello,</p> <p>I have an array of sensors that cannot be defined by a geometrical shape, so I have defined the sensor manually using a binary sensor mask. However, when I go to use time reversal reconstruction to reconstruct the image, I get the following error:</p> <p>In an assignment A(I) = B, the number of elements in B and I must be the<br /> same.<br /> Error in kspaceFirstOrder2D (line 747)<br /> p(sensor_mask_index) = sensor.time_reversal_boundary_data(:,t_index);</p> <p>My script works when I define a sensor using makeCartCircle, so I am wondering if it is not possible to use this reconstruction algorithm for a "non-standard" geometry?</p> <p>Thanks,<br /> Susannah </p>