http://www.k-wave.org/forum/topic/units-in-homogenous-medium-example Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 22:32:38 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/units-in-homogenous-medium-example#post-253 Fri, 11 Nov 2011 02:00:07 +0000 Bradley Treeby 253@http://www.k-wave.org/forum/ <p>Hopefully sometime in the next few weeks. We are just in the process of doing some final debugging of the new features and updating the documentation and examples. </p> http://www.k-wave.org/forum/topic/units-in-homogenous-medium-example#post-252 Fri, 11 Nov 2011 00:46:44 +0000 rmurthy 252@http://www.k-wave.org/forum/ <p>Thank you for the quick response! Any idea when that next release will be coming out? </p> http://www.k-wave.org/forum/topic/units-in-homogenous-medium-example#post-251 Fri, 11 Nov 2011 00:31:58 +0000 Bradley Treeby 251@http://www.k-wave.org/forum/ <p>The current version of k-Wave (B.03) uses linearized acoustic equations. In this case, everything scales linearly (double the input and you'll double the output). However, the governing equations are derived in units of pressure if you would prefer to use more meaningful input values. (In other words, if you give your input in units of Pascals, your output will also be in units of Pascals).</p> <p>In the final graph, the sensor_data is not normalised in any way, but the magnitudes are relative to the initial pressure (5 in this case). The plot scale [-1, 1] is chosen to give suitable contrast in the displayed image.</p> <p>We are just putting the finishing touches on the B.04 release which includes nonlinearity. In this case, the actual value of the pressure (in units of Pa) will affect the characteristics of the simulation. </p> http://www.k-wave.org/forum/topic/units-in-homogenous-medium-example#post-250 Thu, 10 Nov 2011 23:05:40 +0000 rmurthy 250@http://www.k-wave.org/forum/ <p>Hello, </p> <p>In the Homogenous Medium example, there's the following section of code:</p> <p>% create initial pressure distribution using makeDisc<br /> disc_magnitude = 5;</p> <p>The example states that this initial pressure distribution is arbitrary, but I'm interested in simulating a particular transducer's effects on tissue. What are the units of this magnitude value? And when the final graph is formed:</p> <p>imagesc(sensor_data, [-1, 1]);<br /> colormap(getColorMap);<br /> ylabel('Sensor Position');<br /> xlabel('Time Step');</p> <p>What is the sensor_data being normalized to? Is it to this initial pressure magnitude?</p> <p>Thanks! </p>