Module pdf 

Projection onto Dipole Fields (PDF) background field removal

Projects the field onto dipole fields generated by sources outside the brain mask, separating background and local fields.

Reference: Liu, T., Khalidov, I., de Rochefort, L., Spincemaille, P., Liu, J., Tsiouris, A.J., Wang, Y. (2011). “A novel background field removal method for MRI using projection onto dipole fields.” NMR in Biomedicine, 24(9):1129-1136. https://doi.org/10.1002/nbm.1670

Reference implementation: https://github.com/kamesy/QSM.jl

Structs

PdfParams

PDF background field removal

Functions

apply_a 🔒

Apply A = W * D * M_bg

apply_at 🔒

Apply A^T = M_bg * D * W

pdf

Returns

pdf_default

PDF with default parameters (adaptive max_iter matching QSM.jl: ceil(sqrt(nxnynz)))

pdf_with_progress

PDF with progress callback

vec_norm 🔒

Vector 2-norm