Module swi 

Susceptibility Weighted Imaging (SWI)

SWI enhances susceptibility contrast by combining magnitude and phase information. Phase is high-pass filtered, converted to a [0, 1] mask, and multiplied with magnitude.

Reference: Eckstein, K., et al. (2021). “Computationally efficient combination of multi-channel phase data from multi-echo acquisitions (ASPIRE).” Magnetic Resonance in Medicine, 79:2996-3006. https://doi.org/10.1002/mrm.26963

Reference implementation: https://github.com/korbinian90/CLEARSWI.jl

Structs

SwiParams

SWI algorithm parameters

Enums

PhaseScaling

Phase mask scaling type

Functions

calculate_swi

Calculate SWI from unwrapped phase and magnitude

calculate_swi_default

Calculate SWI with default parameters

create_mip

Minimum intensity projection along the z-axis

create_mip_default

Minimum intensity projection with default window of 7 slices

create_phase_mask

Create phase mask from filtered phase values

highpass_filter

High-pass filter by subtracting Gaussian-smoothed version

negative_range 🔒

Get min/max of non-positive values within mask

positive_range 🔒

Get min/max of positive values within mask

rescale 🔒

Linear rescale from [old_min, old_max] to [new_min, new_max]

softplus_scaling

Softplus magnitude scaling for enhanced contrast