http://www.k-wave.org/forum/topic/define-a-circular-phased-array-ultrasound-transducer-with-16-elements Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 17:21:28 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/define-a-circular-phased-array-ultrasound-transducer-with-16-elements#post-6236 Tue, 12 Dec 2017 22:46:34 +0000 Bradley Treeby 6236@http://www.k-wave.org/forum/ <p>Hi liuhao,</p> <p>Unfortunately it's not possible to use the <code>kWaveTransducer</code> class in this way (only linear arrays are supported). For other geometries, you will need to define the sources and sensors directly using <code>source.p_mask</code> (or <code>source.u_mask</code>) and <code>sensor.mask</code>.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/define-a-circular-phased-array-ultrasound-transducer-with-16-elements#post-6221 Thu, 07 Dec 2017 06:37:44 +0000 liuhao 6221@http://www.k-wave.org/forum/ <p>Hello, Dr. Bradley Treeby</p> <p>I am a new guy in Ultrasonic Imaging, I might have the same problem on circle transducers.</p> <p>I need to build 128 transducers on the boundary of a circle area, and using them both as transducers and sensors. I noticed that in "makeTransducer" part of the User's guide, the "tr.radius" should be inf, but how can I put them in a circle way?</p> <p>Thank you very much! </p> http://www.k-wave.org/forum/topic/define-a-circular-phased-array-ultrasound-transducer-with-16-elements#post-5666 Fri, 09 Sep 2016 21:25:24 +0000 Bradley Treeby 5666@http://www.k-wave.org/forum/ <p>Hi CHEN SIYU,</p> <p>When using <code>imrotate</code> in MATLAB, the output matrix will not be the same size as the input. You need to add the option <code>&#39;crop&#39;</code> and it should work.</p> <p>Regarding your second option, I'm not sure what the line of code <code>source_shape2(180-50sin(pi/8:360, :);</code> does.</p> <p>Hope that helps,</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/define-a-circular-phased-array-ultrasound-transducer-with-16-elements#post-5656 Fri, 02 Sep 2016 07:45:11 +0000 CHEN SIYU 5656@http://www.k-wave.org/forum/ <p>hello, can anybody hello me solve the problems?<br /> I wanna define a circular phased array ultrasound with 16 elements and the focus point is at center of the circle.<br /> I have two methods to approach problem.<br /> the below is Matlab code.<br /> 1:define one element of the transducer.<br /> source_shape1 = makeCircle(Nx, Ny, 0, 0, 100, pi/8);<br /> 2:Rotate source_shape1 about pi/8 as the second element<br /> source_shape2 = imrotate(source_shape1, pi/8)<br /> 2:Rotate source_shape1 about pi/8 as the third element<br /> source_shape3 = imrotate(source_shape2, pi/8)<br /> ..........................<br /> 16:source_shape16 = imrotate(source_shape2, pi/8);</p> <p>add all the source_shape together</p> <p>but Matlab generate:<br /> Error using +<br /> Matrix dimensions must agree.</p> <p>The second approach:Nx = Ny = 360<br /> define the first elements<br /> source_shape1 = makeCircle(Nx, Ny, 0, 0, 100, pi/8);<br /> define the second element<br /> source_shape2 = makeCircle(Nx, Ny, 0, 0, 100, pi/4);<br /> cut the unwanted element of the source_shape2<br /> source_shape2(180-50sin(pi/8:360, :);<br /> source_shape3 use the same method as source_shape2;</p> <p>add all the source_shapes together<br /> source.p_mask = zeros(Nx, Ny);<br /> source.p_mask(:, :) = source_shape1 + source_shape2 + ...........source.shape16 ;<br /> but output of the matlab only come out the largest element, why? </p>