getAlphaFilter
Create filter for medium.alpha_filter
.
Syntax
alpha_filter = getAlphaFilter(kgrid, medium, filter_cutoff) alpha_filter = getAlphaFilter(kgrid, medium, filter_cutoff, taper_ratio)
Description
getAlphaFilter
uses getWin
to create a Tukey window via rotation to pass to the medium.alpha_filter
input field of the first order simulation functions (kspaceFirstOrder1D
, kspaceFirstOrder2D
, and kspaceFirstOrder3D
). This parameter is used to regularise time reversal image reconstruction when absorption compensation is included.
Inputs
kgrid |
k-Wave grid object returned by kWaveGrid |
medium |
k-Wave medium structure |
filter_cutoff |
alpha_filter cutoff frequency [Hz], where
Any of the filter_cutoff inputs may be set to |
Optional Inputs
taper_ratio |
taper ratio for Tukey Window (default = 0.5) |
Outputs
alpha_filter |
filter |
Examples
See Also
getWin
, kspaceFirstOrder1D
, kspaceFirstOrder2D
, kspaceFirstOrder3D