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27 Oct 2013 3D Cone beam CT (CBCT) projection backprojection FDK MLEM reconstruction MATLAB codes for students 3D Cone beam CT (CBCT) projection backprojection MLEM FDK reconstruction MATLAB source codes Author: Kyung Sang Kim

Hi Erick,

1. w = cos(theta), to calculate w, my code considers distances in detectors, as your comment, many books calculate in iso-center (DSO) domain. In this case, uu and vv should be differently calculated by considering distance ratio from source to center and source to detector. Please think about angle between iso-center line and extension line source-voxel-detector.

2. In my code, pi/2 rotate shift is for calculating exactly your comment. "interp2" function results in 90 degree rotated image. So I did "angle" -> "angle-pi/2", and I think DSO+ry is right.

3. If you want to get as real projection data, first set blank scan intensity "b", this is related to "dose", then measurement M = b*exp(-projection(obj)).

Thanks your comment.

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