k-Wave

1. wangk524
   

   Member
   Joined: Nov '19
   Posts: 8

   Hi,

   I am trying to model photoacoustic measurements corresponding to cylindrically focused ring-array transducers. Such detectors selectively collect signals originated in the imaging plane thus reducing the tomographic problem to 2D image reconstruction.

   I have implemented the model presented in 'X. L. Dean-Ben, V. Ntziachristos, D. Razansky, IEEE
   Transactions on medical imaging 2012, 31, 1154-1162'(modeling equation given in figure: --- https://imgur.com/Z9eo2hS) to compute the measurement and wanted to validate my model with k-wave simulation.

   Please assist me to simulate photoacoustic measurements corresponding to cylindrically focused transducers.

   Thanks!

   --- Kevin

   Posted 4 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi Kevin,

   We have nothing out of the box to define a cylindrically focused transducer in 3D. However, you could look at the examples in the toolbox to make arcs and bowls, and extend these, e.g., by replicating an arc across multiple planes. Similarly, you could look at the new kWaveArray class and try and extend the arc and bowl functions.

   Hope that helps,

   Brad.

   Posted 4 years ago #

3. wangk524
   

   Member
   Joined: Nov '19
   Posts: 8

   Hi Dr. Bradley Treeby,

   Thank you for the response.

   I thought of a simple way to simulate cylindrically focused transducer measurements and I was wondering if you could give your comments on the method explained below:
   I will simulate the Kspacefirstorder3D function to simulate the measurements. I will define the detector co-ordinates on the circumference of a circle and the source.p0 on the 3D grid points. In order to mimic cylindrical focusing I will (pointwise) multiply the source.p0 by a weight-matrix. The weight matrix will be formed such that the points lying in the same plane as the detection array will have the highest weight (say 1). and the points in the planes away from the detection array plane will have lower weights (maybe like a Gaussian function decreasing with the distance from the detection plane).

   I look forward to your response.

   Thanks!

   -- Kevin

   Posted 4 years ago #

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