http://www.k-wave.org/forum/topic/combination-of-attenuation-coefficients Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 23:09:15 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/combination-of-attenuation-coefficients#post-7215 Wed, 12 Feb 2020 11:42:59 +0000 Bradley Treeby 7215@http://www.k-wave.org/forum/ <p>Hi Kris,</p> <p>Do you have broadband signal or a single frequency / tone burst? If you can fix your frequency, then you can calculate the total attenuation in the voxel in dB/cm. Then you can convert this back to values for <code>alpha_coeff</code> by fixing <code>f</code> and <code>alpha_power</code> (e.g., to 2).</p> <p>Hope that helps,</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/combination-of-attenuation-coefficients#post-7139 Fri, 29 Nov 2019 15:08:21 +0000 kdreher 7139@http://www.k-wave.org/forum/ <p>Hello,</p> <p>I would like to combine two attenuation coefficients in one voxel for simulating with blood perfused tissue. I know that the attenuation is calculated by a = a_0 * f^y.<br /> For example: If I want to combine two substances (e.g. 99% water and 1% blood), I could define my attenuation as a_tot = 0.99 * a_0_water * f^y_water + 0.01 * a_0_blood *f^y_blood.<br /> But I can't define different y-values for different voxels and I can't analytically bring this equation to the form a_tot = a_0_tot * f^y_tot, so that I can have one y_value for all voxels.<br /> What do you think I could do to simulate this as realistically as possible?</p> <p>Sincerely,<br /> Kris </p>