Patent Document ID: 20080205729
Application ID: 11908294
Patent Flag: 0

Claim One:
1. A data processing unit for the iterative reconstruction of the attenuation coefficients μ j (j=1. .. N) of a tomographic image from projection measurements m i (i=1,. .. P), wherein m i = R ( p i ) and ( 1 ) p i = [ A μ _ ] i = ∑ v A iv μ v ( 2 ) with a given measurement function R and a given weighting matrix A=[A ij ], the data processing unit being adapted to determine the update μ j n+1 (n=1,. .. ) of the attenuation coefficient μ j n in the n-th iteration step according to the following equation: μ j n + 1 = μ j n + λ ∑ i ∈ I n V ( A ij μ j n p i n ) · W i ( A , p i n ) · A ij δ i n ( 3 )