k-Wave

1. hko
   

   Member
   Joined: May '17
   Posts: 8

   Hello,

   I was wondering if it is possible to use calculateMassSourceCW with the measured data given as a 1D matrix of complex pressure values. For instance, if I only have the azimuth beam profile (1D) measured for a linear array, can I calculate the equivalent source, which would give me the amplitude and phase of each element in the array?

   I have tried to modify the "Equivalent Source Holography Example" by simulating the measured data using kspaceFirstOrder2D with no luck yet. I wanted to know if I am missing anything before I continue.

   Thank you in advance,
   Khan

   Posted 4 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi Khan,

   In principle, you could run a similar type of optimisation, but I don't imagine it will be very well posed as you will be trying to fit a large number of unknowns (amplitude and phase or driving signal over a plane) with only a small amount of measurement data.

   As an aside, running the simulations in 2D only makes sense if your experimental geometry is 2D (e.g., you have a transducer that is very large in the out of plane direction).

   An alternative approach would be to setup an equivalent transducer (e.g., using a bowl if your transducer is bowl shaped, etc), and then run a simple optimisation over the transducer properties, e.g., radius of curvature, aperture diameter, etc. This problem will be much better posed as you will be fitting only a small number of parameters to your data. You could perform the optimisation using the inbuilt MATLAB routines which are relatively straightforward to use.

   Hope that helps,

   Brad.

   Posted 4 years ago #

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