http://www.k-wave.org/forum/topic/acquire-at-different-transmission-angles Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 23:39:28 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/acquire-at-different-transmission-angles#post-8512 Mon, 25 Apr 2022 19:28:09 +0000 bencox 8512@http://www.k-wave.org/forum/ <p>Hi manik, Define your detector array elements as separate sensors.<br /> Best wishes<br /> Ben </p> http://www.k-wave.org/forum/topic/acquire-at-different-transmission-angles#post-8485 Sat, 19 Mar 2022 01:17:22 +0000 manik 8485@http://www.k-wave.org/forum/ <p>Hi all,<br /> I am trying to do the same, but how to get all RF signal, simulation only give one RF line which is average of signal received by all elements </p> http://www.k-wave.org/forum/topic/acquire-at-different-transmission-angles#post-7404 Fri, 17 Apr 2020 16:06:19 +0000 Bradley Treeby 7404@http://www.k-wave.org/forum/ <p>Hi jr20,</p> <p>You can send an unfocused angled transmit by setting the focus distance to infinite and giving an angle. For example, open the <a href="http://www.k-wave.org/documentation/example_us_beam_patterns.php">Simulating Ultrasound Beam Patterns Example</a> and set:</p> <pre><code>transducer.focus_distance = inf; % focus distance [m] transducer.elevation_focus_distance = inf; % focus distance in the elevation plane [m] transducer.steering_angle = 20; % steering angle [degrees]</code></pre> <p>Brad </p> http://www.k-wave.org/forum/topic/acquire-at-different-transmission-angles#post-7400 Wed, 15 Apr 2020 14:38:48 +0000 jr20 7400@http://www.k-wave.org/forum/ <p>Hi all,</p> <p>I want to perform coherent plane-wave compounding. The idea is that you transmit plane waves at different angles and then sum them coherently to increase SNR, maintaining high frame rates. I am using the built-in transducer class. I have an idea on how to perform the angled transmission and an idea on how to transmit unfocused waves:</p> <p>1. To perform angled transmissions, I would set the focus_distance = 0 and steering_angle = theta, where theta would be an angle that would change for each acquisition, say -30:3:30 degrees. This would allow performing the transmissions in the correct directions.</p> <p>2. To perform unfocused transmissions, I simply set focus_distance = inf or some very high number.</p> <p>Now, I suppose you can see the problem. focus_distance must be 0 to transmit in the correct direction but must be inf to transmit an unfocused wave. </p> <p>Is there any other way to rotate the transducer while maintaining the focus_distance = inf? Or a different way to transmit an unfocused/diverging/planar wave?</p> <p>If my explanation was not clear, please check Fig.1 in the following article, I believe this illustration is quite clear to understand the type of transmission I wish to perform:</p> <p>J. Porée, D. Posada, A. Hodzic, F. Tournoux, G. Cloutier and D. Garcia, "High-Frame-Rate Echocardiography Using Coherent Compounding With Doppler-Based Motion-Compensation," in IEEE Transactions on Medical Imaging, vol. 35, no. 7, pp. 1647-1657, July 2016. (<a href="https://ieeexplore.ieee.org/document/7398090" rel="nofollow">https://ieeexplore.ieee.org/document/7398090</a>) </p>