Prior Image Guided Undersampled Dual Energy Reconstruction with Piecewise Polynomial Function Constraint

Algorithm 1

Image approximation by PPF.

(1)  Let 𝝋=𝟎,𝐰=𝟎;

(2)  For each patch pair 𝐱_𝐿^(𝑠) and 𝐱_𝐻^(𝑠)

(3)    if ( ||𝐱_𝐿^(𝑠)||₂≥𝛿 ) Calculate 𝝋^(𝑠)=𝐏(𝐱_𝐿^(𝑠))𝐱_𝐻^(𝑠) by (8);

(4)    else 𝝋^(𝑠)=𝟎;

(5)     𝝋=𝝋+𝐄^(𝑠)𝑇𝐆𝝋^(𝑠),𝐰=𝐰+𝐄^(𝑠)𝑇𝐆⋅𝟏, aggregate the weighted images;

(6)  End for

(7)  Output 𝝋/𝐰;