I need help with ifanbeam

Hello,

i'm quite new to matlab, and i'm trying to implement image reconstruction from projections. i have a fanbeam projection over 180 images labelled as fanbeam projections

(since the file is above 5mb, i can't upload it on matlab, but i've provided this link on dropbox to download the file https://www.dropbox.com/s/uvqh1s3teu4s6tl/fanbeam%20projections.mat?dl=0)

the matrices of the fanbeam projection is (400x706x180)

each fan-beam projection rotation is captured at 1 degree angle over 180 images. i am not sure as to what i'm supposed to do to reconstruct the image? i've tried reshaping the array using A=reshape(sinostack2,[],180); %so that each columb contains a fan-beam projection.. but its not working.. i've set D as = round(sqrt(size(sinostack2,1)^2 + size(sinostack2,2)^2)); any help would be appreciated

Thanks