k-Wave

1. Thomas2100
   

   Member
   Joined: Aug '20
   Posts: 1

   Hi

   I would like to know if it possible to generate data on a polar grid? I would like to generate point sources arranged in a circle and rotate a transducer element to scan the sources as they propagate inwards . However I found that N grid is always set in Cartesian coordinates with equidistant pixel size. Whereas in polar coordinates one would expect the pixel size to increase as a function of depth...

   I found the ultrasound B scan mode example where a steering angle is used to generate a ultrasound B mode scan but it seems the steering angle is performed on a Cartesian grid rather than cylindrical? is this correct?

   http://www.k-wave.org/documentation/example_us_bmode_phased_array.php

   Thomas

   Posted 4 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi Thomas,

   Except for when using the axisymmetric code, you're right that the computational grid is always on a regularly-spaced Cartesian grid. This allows us to use the FFT to compute spatial gradients.

   If you use the new kWaveArray class, you can place sources and sensors anywhere in the grid without staircasing artefacts (e.g., without the source shape being rastered to the grid). So there shouldn't be any limitations of using a Cartesian grid per se.

   Brad.

   Posted 4 years ago #

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