http://www.k-wave.org/forum/topic/sensor-mask-of-3d-time-reversal-reconstruction-for-a-spherical-sensor Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 00:13:43 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/sensor-mask-of-3d-time-reversal-reconstruction-for-a-spherical-sensor#post-4393 Sat, 29 Mar 2014 09:56:14 +0000 Bradley Treeby 4393@http://www.k-wave.org/forum/ <p>Hi Marina,</p> <p>Unfortunately, if you want to place your sensor points in arbitrary positions, you will have to write some code to do this. An alternate to using a binary sensor mask as Anthony suggested would be to use a Cartesian sensor mask. This is just a list of the Cartesian coordinates of the sensor points. Using the desired radius of the sphere and the polar angles of your sensor points, it should be simple to calculate their positions.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/sensor-mask-of-3d-time-reversal-reconstruction-for-a-spherical-sensor#post-4391 Sat, 29 Mar 2014 03:04:43 +0000 Marina 4391@http://www.k-wave.org/forum/ <p>Hi Anthony,</p> <p>It is very very kind of you to reply my question.</p> <p>If I do as what you said, it is true that I can control exactly where the sensor points are. But I need them to be on the same sphere, so I must make a lot of calculations by myself, instead of using some function like Makeball.</p> <p>Could you give me more some suggestions to solve this problem?</p> <p>Thanks a lot !!! </p> http://www.k-wave.org/forum/topic/sensor-mask-of-3d-time-reversal-reconstruction-for-a-spherical-sensor#post-4385 Wed, 26 Mar 2014 12:10:28 +0000 Anthony 4385@http://www.k-wave.org/forum/ <p>Hi Marina, </p> <p>I am not a member of the development team so my answer is not at all "official" but I always define the sensor point myself. </p> <p>You just have to define the variable "sensor.mask" as a logical grid with the same size as your computational domain and set the value to "true" where you want to record the data. </p> <p>For example, if you want to record the data at all the points of your domain :<br /> <code>sensor.mask(1:Nx, 1:Ny, 1:Nz) = true;</code></p> <p>And then, you run kwave as usual:<br /> <code>kspaceFirstOrder3D(kgrid, medium, source, sensor, input_args{:});</code></p> <p>This way, you control exactly where are your sensor points.</p> <p>Hope it helps :-)<br /> Anthony </p> http://www.k-wave.org/forum/topic/sensor-mask-of-3d-time-reversal-reconstruction-for-a-spherical-sensor#post-4384 Mon, 24 Mar 2014 12:11:07 +0000 Marina 4384@http://www.k-wave.org/forum/ <p>Hi Brad,</p> <p>I am looking forward for your reply soon!</p> <p>Thanks a lot!</p> <p>Marina </p> http://www.k-wave.org/forum/topic/sensor-mask-of-3d-time-reversal-reconstruction-for-a-spherical-sensor#post-4378 Thu, 20 Mar 2014 11:05:24 +0000 Marina 4378@http://www.k-wave.org/forum/ <p>Hi Brad,</p> <p>Actually I mean that I would like the sensor points to be positioned over the surface of the sphere not evenly, that is to say, I can control the distribution of these sensor points over the surface of the sphere. For example,I hope there are more sensor points somewhere (the density of sensor points is bigger) that other places over the surface of the sphere. And all the sensor points are positioned over the same surface of the sphere.</p> <p>Have I made myself understood?</p> <p>Thanks.</p> <p>Marina </p> http://www.k-wave.org/forum/topic/sensor-mask-of-3d-time-reversal-reconstruction-for-a-spherical-sensor#post-4377 Wed, 19 Mar 2014 10:05:25 +0000 Bradley Treeby 4377@http://www.k-wave.org/forum/ <p>Hi Marina,</p> <p>I'm not sure I follow exactly what you're trying to do. Do you mean you would like the sensor points to be randomly positioned over the surface of the sphere, or positioned over a different shaped surface, or something else?</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/sensor-mask-of-3d-time-reversal-reconstruction-for-a-spherical-sensor#post-4375 Tue, 18 Mar 2014 15:02:22 +0000 Marina 4375@http://www.k-wave.org/forum/ <p>Hello,</p> <p>In the example of 3D Time Reversal Reconstruction For A Spherical Sensor, there is a function makecartsphere, which makes a sensor mask of 100 points evenly distributed around a sphere.</p> <p>But I want to make a spherical sensor mask of 100 points not evenly distributed around the sphere.</p> <p>Is there an easy way?</p> <p>thanks a lot! </p>