http://www.k-wave.org/forum/topic/issues-with-using-addlineelement Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 21:35:35 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/issues-with-using-addlineelement#post-9055 Wed, 20 Mar 2024 20:13:44 +0000 Bradley Treeby 9055@http://www.k-wave.org/forum/ <p>Hi Zhu, I recommend taking a look at the <a href="http://www.k-wave.org/documentation/example_at_array_as_source.php">examples</a>. These explain why the source mask is non local. </p> http://www.k-wave.org/forum/topic/issues-with-using-addlineelement#post-9054 Wed, 20 Mar 2024 09:17:58 +0000 zhu1 9054@http://www.k-wave.org/forum/ <p>I am trying to use addLineElement to add a transducer with a diameter of 3mm, but after generating it, the mask obtained using getArrayBinaryMask is much larger than 3mm. Can you tell me what to do? Thank you.<br /> Below is part of the code:<br /> （<br /> clc;<br /> clear all;<br /> %%%%%%%%%%%%%%<br /> pml_size = 40; % [grid points]<br /> Nx = 256; % [grid points]<br /> Ny = 256; % [grid points]<br /> dx = 0.25e-3; % [m]<br /> dy = 0.25e-3; % [m]<br /> kgrid = kWaveGrid(Nx, dx, Ny, dy);</p> <p>medium.sound_speed = 1510; % [m/s]<br /> medium.density = 1020; % [kg/m^3]<br /> medium.alpha_coeff = 0.75; % [dB/(MHz^y cm)]<br /> medium.alpha_power = 1.5;<br /> %频率疑问 频率高了（差不多超过4.5mhz图上就显示很差）<br /> freq1 = 2.22e6; % 4.5 MHz<br /> freq2 = 2.22e6;<br /> % freq1 = 5.22e6; % 4.5 MHz<br /> % freq2 = 5.58e6;</p> <p>%振幅疑问%%%%%%%%%%%%%%%%%%%<br /> amp = 0.53e6; % 0.53[MPa]<br /> % vrad_bk=1*0.7; %with backing side vibration velocity amplitude 0.68*0.6<br /> %<br /> % vrad_nobk=0*0.27; %without backing side vibration velocity amplitude</p> <p>% 换能器设置<br /> karray = kWaveArray('BLITolerance', 0.05, 'UpsamplingRate', 10);<br /> line_diameter = 0.003; % [m]<br /> x_start = int32 (Nx/2 - (line_diameter / dx)/2);<br /> x_end =int32 (Nx/2 + (line_diameter / dx)/2);<br /> y_start =int32 (Ny/2 - (line_diameter / dy)/2);<br /> y_end = int32 (Ny/2 + (line_diameter / dy)/2);</p> <p>% 添加线性元素到换能器阵列<br /> karray.addLineElement([ 0,-0.0015],[ 0,0.0015]);<br /> zhu = karray.getArrayBinaryMask(kgrid);<br /> ） </p>