http://www.k-wave.org/forum/topic/attenuation-simulation Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 01:08:57 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/attenuation-simulation#post-3518 Tue, 07 May 2013 08:36:23 +0000 Bradley Treeby 3518@http://www.k-wave.org/forum/ <p>There is some information in Sections 2.7, 3.2, and 3.4 in the <a href="http://www.k-wave.org/documentation.php">k-Wave Manual</a> that you might find helpful in regards to the grid spacing and maximum supported frequency. </p> http://www.k-wave.org/forum/topic/attenuation-simulation#post-3509 Tue, 07 May 2013 02:34:50 +0000 yinhaoscu 3509@http://www.k-wave.org/forum/ <p>Julian, thanks a lot for your reply. If convenient, would you please give me a link on the related topic in this forum about the calculaton of maximum supported frequency. </p> http://www.k-wave.org/forum/topic/attenuation-simulation#post-3314 Tue, 30 Apr 2013 11:52:53 +0000 Julian 3314@http://www.k-wave.org/forum/ <p>Hi yinhaoscu,</p> <p>I think the grid doesn't support frequencies higher than 3.42 Mhz. You can calculate the maximum frequency by f_max = c_min/(2*dx). c_min denotes the minimal velocity of sound and dx the spacing between the grid points.</p> <p>If you want to know more, just look around in the forum.</p> <p>Hoping to help,</p> <p>Julian </p> http://www.k-wave.org/forum/topic/attenuation-simulation#post-3115 Sat, 27 Apr 2013 10:45:05 +0000 yinhaoscu 3115@http://www.k-wave.org/forum/ <p>I modified the example_us_bmode_linear_transducer.m matlab code to do simulation, and set sampling frequency to fixed 40MHz instead of CFL related one. </p> <p> x = 50e-3;<br /> dx = 0.15e-3; % [m]<br /> Nx = ceil(x/dx);</p> <p> medium.alpha_coeff = 0.5;<br /> % [dB/(MHz^y cm)]<br /> medium.alpha_power = 1.0; % linear relationship between attenuation and frequency<br /> medium.alpha_mode = 'no_dispersion';<br /> % medium.BonA = 6; comment this line to ignore the nonlinear effect</p> <p> tone_burst_freq = 3e6; % [Hz]<br /> tone_burst_cycles = 5;</p> <p>if central frequency was set to 3MHz, the simulation results are very good. However when 5MHz was used, the results was bad. Any one could give me some suggestion. </p>