http://www.k-wave.org/forum/topic/error-in-acoustic-signal-within-homogeneous-tissue Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 00:22:32 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/error-in-acoustic-signal-within-homogeneous-tissue#post-6519 Fri, 13 Jul 2018 22:01:01 +0000 Bradley Treeby 6519@http://www.k-wave.org/forum/ <p>Hi Alexander,</p> <p>That sound like a pretty small error, on par with the accuracy of the perfectly matched layer. If you are using a Cartesian sensor mask, the output is calculated by linear interpolation from the pressure on the grid points, so there will always be some error.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/error-in-acoustic-signal-within-homogeneous-tissue#post-6508 Thu, 28 Jun 2018 17:05:10 +0000 Alexander 6508@http://www.k-wave.org/forum/ <p>Hi,</p> <p>I was looking at doing some reconstruction given the acoustic data from a homogeneous medium using a full ring based sensor array (256 sensors covering 360 degrees). I notice that if I have some acoustic source in the center of a medium that the data on any of the sensors won't be a sum difference of 0 as expected. Seeing as the medium is homogeneous and all the sensors are equal distance apart the pressure waves should be the same amplitude and have the same arrival time. </p> <p>However, it would be something between 10^-3 - 10^-9 [Pa] difference (given a 10 Pa initial wave). I was looking through the documentation and wanted to clarify if these results are just errors resulting from the simulation running? </p> <p>Extra info:<br /> - medium is just fatty tissue 0.11m^2 with a dx/dy of 2x10^-5 m. So a 500^2 matrix<br /> - point source pressure wave at index (249:251, 249:251).<br /> - source.p_mode = 'dirichlet'; is true<br /> - center_freq = 7.5x10^6 [Hz]; bandwidth = 100 </p>