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1. f4rhad
   

   Member
   Joined: Jul '14
   Posts: 4

   I tried to simulate the first example and I did not touch anything else to ruin them,
   but these errors come up usually

   Error using dt (line 13)
   Not enough input arguments.

   Error in kspaceFirstOrder2D (line 484)
   disp([' dt: ' scaleSI(dt) 's, t_end: ' scaleSI(t_array(end)) 's, time steps: ' num2str(length(t_array))]);

   I guess thats because in main script this line is used without arguments while it needs an input like B!
   -----------------
   function D = dt(B)
   -----------------
   line 484: disp([' dt: ' scaleSI(dt) 's, t_end: ' scaleSI(t_array(end)) 's, time steps: ' num2str(length(t_array))]);

   Posted 9 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,640

   Hi f4rhad,

   Do you have a user function somewhere called dt? It seems there is an issue with MATLAB deciding about the scope of the variable dt used in the code and your function with the same name. You could correct this by:
   (1) declaring dt = 0 at the beginning of kspaceFirstOrder2D
   (2) replacing dt in kspaceFirstOrder2D with kgrid.dt
   (3) renaming your dt function or removing it from the path.

   Hope that helps,

   Brad.

   Posted 9 years ago #

3. f4rhad
   

   Member
   Joined: Jul '14
   Posts: 4

   Dear Brad,
   Hi
   That helped a lot I had a dt.m in an obsolete folder of snake algorithm. I removed it from the Path and it`s working awesome .

   may I add a question related why i started using k-wave?
   -I wanted to add speckle noise to a synthetic image. I got desperate doing that with Field II! Is it possible with K-wave?

   Sincerely,
   Farhad

   Posted 9 years ago #

4. f4rhad
   

   Member
   Joined: Jul '14
   Posts: 4

   This is what I want to do:
   http://8pic.ir/images/uo48la69a8k8cuxlcn27.jpg

   but I do not want to add gaussian noise this way!
   I want to add the normal noise of ultrasound transducer(speckle) with simulation of sonography.

   -BR
   Farhad

   Posted 9 years ago #

5. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,640

   Hi Farhad,

   It's certainly possible to simulate diagnostic US images with k-Wave. However, the full-wave nature of the simulations means the computational expense is reasonably high. You can get started by looking at the "Diagnostic Ultrasound Simulation" examples included in the html help with the toolbox.

   Brad.

   Posted 9 years ago #

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