http://www.k-wave.org/forum/topic/power-law-absorption Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 23:29:11 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/power-law-absorption#post-7090 Fri, 18 Oct 2019 20:10:55 +0000 Bradley Treeby 7090@http://www.k-wave.org/forum/ <p>Hi elliotP,</p> <p>These values weren't directly converted, but obtained by fitting to the values from the White paper (see the fit in [2]).</p> <p>Hope that helps,</p> <p>Brad </p> http://www.k-wave.org/forum/topic/power-law-absorption#post-7064 Mon, 30 Sep 2019 04:03:52 +0000 elliotP 7064@http://www.k-wave.org/forum/ <p>Hi Brad,</p> <p>I am confused about power-law absorptions in the elastic simulation. You mention that your material properties in your papers [2], [3] (especially α0,model in compression=8.83 dB/(MHz^2cm), in shear=19.5 dB/(MHz^2cm)) for skull bone in your simulation based on this paper [1]. But compression=70 Np/m and shear=213 Np/m absorptions constants were used in the referenced paper [1]. How did you convert Np/m to dB/(MHz^2cm)? Also, I read your paper[2] however I couldn't find any function or method in k-Wave.</p> <p>Thank you for your effort and attention!</p> <p>Thank you,<br /> Michael</p> <p>[1]J. White, G. T. Clement, and K. Hynynen, “Longitudinal and shear mode ultrasound propagation in human skull bone,”</p> <p>[2]Modeling power law absorption and dispersion in viscoelastic solids using a split-field and the fractional Laplacian</p> <p>[3]The effects of image homogenisation on simulated transcranial<br /> ultrasound propagation. </p>