http://www.k-wave.org/forum/topic/photoacoustic-signal-detection-in-very-front-of-the-transducer Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 03:13:35 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/photoacoustic-signal-detection-in-very-front-of-the-transducer#post-5667 Fri, 09 Sep 2016 21:27:47 +0000 Bradley Treeby 5667@http://www.k-wave.org/forum/ <p>Hi joy4162,</p> <p>I'm not sure I exactly follow your setup. Would you be happy to post a working example?</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/photoacoustic-signal-detection-in-very-front-of-the-transducer#post-5659 Thu, 08 Sep 2016 07:57:59 +0000 joy4162 5659@http://www.k-wave.org/forum/ <p>Hi, I'm just trying to simulate the PA signal.<br /> I created a target and a sensor.</p> <p>Briefly show the parameters</p> <p>grid: x,y,z =&gt; 150, 150, 1000<br /> dx,dy,dz =&gt; 1-e9, 1-e9, 1-e9.</p> <p>location of target --&gt; x,y,z (75,75,10)<br /> location of sensor --&gt; x,y,z (75,75,990)<br /> .</p> <p>So, the sensor was located in front of the target(almost 1um).<br /> I know it is very close, not real.<br /> anyway I tried to simulate it with this parameter.<br /> However, the result was a quite weird. </p> <p>a half of the PA signal was located (:,:,10)(located at upper of the result image) --&gt; it's okay<br /> other half of the PA signal was located at very bottom of the result image.</p> <p>I think the bottom signal should be just 0.</p> <p>result PA image like this:</p> <p> ----------------------------------- &lt;&lt; transducer<br /> |==================== &lt;&lt;the half of PA signal ( and target was located this location)<br /> |<br /> |<br /> |<br /> |<br /> |<br /> |<br /> |==================== &lt;&lt; the half of PA signal &lt;&lt;== should be zero signal!</p> <p>Could anyone explain why it happen? </p>