http://www.k-wave.org/forum/topic/tgc-alpha-in-ultrasound-b-mode Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 03:00:58 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/tgc-alpha-in-ultrasound-b-mode#post-7282 Fri, 06 Mar 2020 21:09:44 +0000 ninasnum 7282@http://www.k-wave.org/forum/ <p>Thanks Bradley, this clears it up :) </p> http://www.k-wave.org/forum/topic/tgc-alpha-in-ultrasound-b-mode#post-7275 Fri, 06 Mar 2020 13:56:54 +0000 Bradley Treeby 7275@http://www.k-wave.org/forum/ <p>Hi ninasnum,</p> <p>This example has been updated in the latest release (V1.3) as the <code>tgc_alpha</code> value was in the wrong units. Take a look at the new version, and let me know if you're still stuck.</p> <p>Brad </p> http://www.k-wave.org/forum/topic/tgc-alpha-in-ultrasound-b-mode#post-7272 Thu, 05 Mar 2020 21:35:01 +0000 ninasnum 7272@http://www.k-wave.org/forum/ <p>Hi all,<br /> I was wondering from the Ultrasound B-Mode simulation, how do you determine the tgc_alpha value in the time gain compensation step? (in the example it is 0.4).<br /> <pre><code>% create time gain compensation function based on attenuation value, % transmit frequency, and round trip distance tgc_alpha = 0.4; % [dB/(MHz cm)] tgc = exp(2 * tgc_alpha * tone_burst_freq * 1e-6 * r * 100);</code></pre> <p>Also, if I want to simulate the three balls example in a medium made of water (c0 = 1480 [m/s], rho0 = 1000 [m/s], medium.alpha_coeff = 0.0022 [dB/(MHz^y cm)], and medium.alpha_power = 2.0), how should I modify the tgc_alpha value? Would the tgc_alpha be the same as the medium.alpha.coeff? </p>