http://www.k-wave.org/forum/topic/b-mode-image-of-a-phantom-with-two-inclusions Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 01:52:24 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/b-mode-image-of-a-phantom-with-two-inclusions#post-8277 Thu, 05 Aug 2021 16:02:05 +0000 marjanbn 8277@http://www.k-wave.org/forum/ <p>Hi Dr. Treeby, </p> <p>Thanks for your info. It helps a lot.</p> <p>Best,<br /> Marjan </p> http://www.k-wave.org/forum/topic/b-mode-image-of-a-phantom-with-two-inclusions#post-8273 Wed, 04 Aug 2021 20:11:56 +0000 Bradley Treeby 8273@http://www.k-wave.org/forum/ <p>Hi Marjan,</p> <p>The "smearing" of the circular inclusion is a result of the finite beam width. This is affected by both the imaging physics (the width of the focused beam on transmit) and the beam-forming on receive. My guess is there is nothing wrong with your simulation, just that the experiment used better signal processing (e.g., dynamic receive beamforming / multi-zone transmit) and potentially a higher frequency (which gives a narrower beam-width). You could look <a href="https://www.ustb.no/">USTB</a> if you want to play around with different approaches to beam-forming / image formation.</p> <p>Hope that helps,</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/b-mode-image-of-a-phantom-with-two-inclusions#post-8272 Wed, 04 Aug 2021 15:15:33 +0000 marjanbn 8272@http://www.k-wave.org/forum/ <p>Dear k-Wave developers,</p> <p>I am trying to generate a B-mode image for a phantom with two inclusions (circular shape) using "Simulating B-mode Ultrasound Images Example".</p> <p>The center of the first inclusion, having a diameter of 5 mm, locates at the depth of 10 mm, and the other one, having a diameter of 10 mm, locates at the depth of 25 mm.</p> <p>If I define the focus distance at 10 mm, I will get the first inclusion exactly circular and almost lost the second inclusion (which makes sense), and the same goes for the second inclusion if I define the focus distance at 25 mm. However, if I select a focus distance between 13 to 18 mm, I will get the B-mode image with oval inclusions, whereas in practice, using an ultrasound machine, we get the B-mode image with circular inclusions. How can I get the circular shape for inclusions in the simulation?</p> <p>Please find below some figures for clarification:<br /> <a href="https://photos.app.goo.gl/JkEtfgU1SwdAwzCt7" rel="nofollow">https://photos.app.goo.gl/JkEtfgU1SwdAwzCt7</a></p> <p>P.S., I tried playing with the apodization settings, e.g., changing the transmit_apodization to 'Gaussian' but it didn't help.</p> <p>Thanks in advance for your time answering my question, and thanks for the great toolbox.</p> <p>Best,<br /> Marjan </p>