http://www.k-wave.org/forum/topic/the-different-values-of-the-cycle-in-function-toneburst-in-hifu-simulation Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 21:40:34 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/the-different-values-of-the-cycle-in-function-toneburst-in-hifu-simulation#post-9245 Thu, 29 Jan 2026 09:16:11 +0000 guojia 9245@http://www.k-wave.org/forum/ <p>Hi everyone, recently, I have been using kWaveArray to simulate the phased array ultrasound focusing sound field. However, when using the function " toneBurst" , I found that the value of "cycle" must be large enough (≥500) to obtain reasonable results; otherwise, the gain of the focused sound field would be too high, which is not reasonable. Could you please tell me what the reason is? The code is as follows:</p> <p>input_args={'DisplayMask',source.p_mask + sensor.mask,...<br /> 'DataCast','double',...<br /> 'CartInterp','linear',...% 'CartInterp','nearest',...<br /> 'PMLSize',[20 20 20],...<br /> 'PMLAlpha',5,...<br /> 'PMLInside',false};<br /> sensor_data=kspaceFirstOrder3DG(kgrid,medium,source,sensor,input_args{:});</p> <p>% 求取各阵元延时<br /> % [max_val,max_pos]=max(sensor_data,[],2);<br /> % travel_time=max_pos;<br /> % time_delays=max(travel_time)-travel_time;</p> <p>sig_rev=fliplr(sensor_data);<br /> [max_val,max_pos]=max(sig_rev,[],2);<br /> time_delays=max_pos-min(max_pos);</p> <p>focus_mask=source.p_mask;<br /> source.p_mask=sensor.mask;<br /> p0=0.1e6;<br /> % source_cycle2=490; % 能够聚焦，但是结果会发散，声压增益500倍<br /> source_cycle2=500;<br /> source.p=1e6*toneBurst(1/kgrid.dt,f0,source_cycle2,'SignalOffset',time_delays,'Envelope','Rectangular');</p> <p>sensor.mask=zeros(nx,ny,nz);<br /> sensor.mask(Index_x-30:Index_x+30,Index_y-30:Index_y+30,:)=1;<br /> sensor.record={'p','p_max_all'};<br /> nT=100;<br /> sensor.record_start_index=kgrid.Nt-T0/kgrid.dt*nT+1;</p> <p>It is currently unclear what specific reason caused this. I would greatly appreciate it if friends could help figure out exactly what the cause is. Thank you very much. </p>