Hello, I am new to k-wave toolbox and photoacoustic imaging. I am trying to simulate photoacoustic data with very simple set up: a linear array sensor and a circular source. After running kspaceFirstOrder2D, I got a sensor element vs. dt data matrix.

I am confused to what are the next steps to perform delay and sum? I understand that DAS requires multiple scan lines data, but I don't know how exactly do I simulate that in kwave toolbox.

Any help would be greatly appreciated!