k-Wave Toolbox

focus

Create input signal based on source mask and focus position

Syntax

input_signal_mat = focus(kgrid, input_signal, source_mask, focus_position, sound_speed)

Description

focus takes a single input signal and a source mask and creates an input signal matrix (with one input signal for each source point). The appropriate time delays required to focus the signals at a given position in Cartesian space are automatically added based on the user inputs for focus_position and sound_speed.

Inputs

`kgrid`	k-Wave grid structure returned by makeGrid
`input_signal`	single time series input
`source_mask`	matrix specifying the positions of the time varying source distribution (i.e., source.p_mask or source.u_mask)
`focus_position`	position of the focus in Cartesian coordinates
`sound_speed`	scalar sound speed

Outputs

input_signal_mat

matrix of time series following the source points using MATLAB's column-wise linear index ordering

flyThrough

fwhm