http://www.k-wave.org/forum/topic/em-wave-sar-specific-absorbation-rate-wkg-unit-conversion-to-dbmhzy-cm Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 21:37:34 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/em-wave-sar-specific-absorbation-rate-wkg-unit-conversion-to-dbmhzy-cm#post-9016 Wed, 24 Jan 2024 11:43:07 +0000 Bradley Treeby 9016@http://www.k-wave.org/forum/ <p>The medium properties should be the acoustic medium properties. To get from the SAR to the acoustic source, you will also need to know something about the spatial distribution of EM energy, and the time course. For example, if the EM energy is spatially uniform and deposited quickly enough to satisfy stress confinement, the SAR will be proportional to <code>source.p0</code>. </p> http://www.k-wave.org/forum/topic/em-wave-sar-specific-absorbation-rate-wkg-unit-conversion-to-dbmhzy-cm#post-8995 Fri, 29 Dec 2023 10:09:10 +0000 Wave_Base 8995@http://www.k-wave.org/forum/ <p>A small corrections though as I mentioned above 'kspaceFirstOrder3D' functions to be used, this fun. only helps to model receiver side medium properties (eg: while using ultrasound as a receiver, the inspected bio-phantom medium properties can be modeled detailed), however to insert externally calculated SAR values, maybe we need to use <code>db2neper</code> and <code>kWaveDiffusion</code> functions.</p> <p>Pse correct my understanding and suggest how this SAR values can be combined with k-wave for acoustic wave computation/ reconstruction? </p> <p>Eg: SAR values:</p> <pre><code>x [mm] |y [mm] z [mm] SAR [W/Kg] -136.24555 35.84012 -155.44064 0 -116.20845 35.84012 -155.44064 0.014069968 -96.171354 35.84012 -155.44064 0.0094948029 -76.134254 35.84012 -155.44064 0.00342158 -56.097154 35.84012 -155.44064 0.0041124122 -36.060054 35.84012 -155.44064 0.019160267 -16.022954 35.84012 -155.44064 0.0092651602 4.0141461 35.84012 -155.44064 0.016273774</code></pre> <p>and so on.... </p> http://www.k-wave.org/forum/topic/em-wave-sar-specific-absorbation-rate-wkg-unit-conversion-to-dbmhzy-cm#post-8994 Fri, 29 Dec 2023 05:26:26 +0000 Wave_Base 8994@http://www.k-wave.org/forum/ <p>Dear all,</p> <p>Greetings!</p> <p>I'm trying to simulate thermoacoustic response in k-wave by using EM waves as a source (already done with CST software), </p> <p>From CST I have SAR values for a meadium/ phantom, however i need to generate acoustic signal based on SAR using K-wave, I have gone through all the response in this forum but i still need clarity to integrate CST SAR values which i have obtained as W/kg or dB(W/kg) unit scale, and how this can be embed into K-wave-'kspaceFirstOrder3D' function, as i can see i need to play with (<code>&#39;medium.BonA&#39;, &#39; medium.alpha_power&#39;, &#39;medium.alpha_coeff&#39;, &#39;medium.alpha_mode&#39;</code>), variables for adaptation, however unites that I need to deal with is [dB/(MHz^y cm)] but here i have SAR values in W/kg or dB(W/kg), how this can be mearged or any other alternitive ways?</p> <p>Pls suggest your valuable comments. </p>