zetera0702 Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 01:05:03 +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-a-section-of-the-image-with-2d-time-reversal-reconstruction-for-a#post-8554 Fri, 17 Jun 2022 15:04:13 +0000 bencox 8554@http://www.k-wave.org/forum/ <p>Hi zetera0702,</p> <p>You have to have the sensors in the domain when doing time reversal reconstruction, but you could always mask them out afterwards.</p> <p>Best wishes<br /> Ben </p> http://www.k-wave.org/forum/topic/reconstructing-a-section-of-the-image-with-2d-time-reversal-reconstruction-for-a#post-8545 Mon, 30 May 2022 22:38:56 +0000 zetera0702 8545@http://www.k-wave.org/forum/ <p>I am generating sensor data through the simulation 2D Time Reversal Reconstruction For A Circular Sensor and then I enter them into a network to improve the synogram, however when reconstructing the image, the circle of the sensors is seen, I want to know if you can reconstruct only the central section of the image so that the sensors are not shown, I have been trying to make a kgrid to generate the data as follows:<br /> PML_size = 20; % size of the PML in grid points.<br /> Nx = 256 - 2 * PML_size; % number of grid points in the x direction<br /> Ny = 256 - 2 * PML_size; % number of grid points in the y direction<br /> x = 50.1e-3; % total grid size [m]<br /> y = 50.1e-3; % total grid size [m] dx = 2.3194e-3; % total grid size [m]<br /> dx = x/Nx; % grid point spacing in the x direction [m] dy = 2.3194e-3; % total grid size [m]<br /> dy = y/Ny; % grid point spacing in the y direction [m] kgrid = kWaveGrid [m] kgrid = kWaveGrid [m<br /> kgrid = kWaveGrid(Nx, dx, Ny, dy);</p> <p>I have subsequently generated a reconstruction kgrid that is smaller with:<br /> Nx = 300; % number of grid points in the x direction.<br /> Ny = 300; % number of grid points in the y direction<br /> xx=20.1e-3;<br /> yy=20.1e-3;<br /> dx = xx/Nx; % grid point spacing in the x direction [m]; dy = 6.7e-5; % number of grid points in the y direction<br /> dy = yy/Ny; % grid point spacing in the y direction [m]<br /> kgrid_recon = kWaveGrid(Nxx, dxx, Nyy, dyy);</p> <p>but when I do it I get the following error </p> <p>Error using cart2grid (line 118)<br /> Cartesian points must lie within the grid defined by kgrid.</p> <p>Error in kspaceFirstOrder_inputChecking (line 616)<br /> [sensor.mask, order_index, reorder_index] = cart2grid(kgrid, sensor.mask,<br /> flags.axisymmetric);</p> <p>Error in kspaceFirstOrder2D (line 537)<br /> kspaceFirstOrder_inputChecking;</p> <p>Error in Reconstruccion_Sensor_circular_ejemplo (line 87)<br /> p0_recon = kspaceFirstOrder2D(kgrid_recon, medium, source, sensor,input_args{:});</p> <p>i.e. my general grid is 50.1mm x50.1mm and the reconstruction grid I need to be 20.1mmx20.1mm. </p>