[Rtk-users] 3D projection, how to set the intensity of projection image

[Simon Rit]

Hi,
FDK uses the output of ProjectionsReader, which can be accessed with the
command line rtkprojections.
Please the mailing list for your questions, they might be of interest to
everyone.
Simon

On Thu, Oct 26, 2023 at 2:38 PM Fuquan Deng <dfq_2022 at 163.com> wrote:

> Hi,
> I have recoveried iterative beam harden correction algorithm. The
> algorithm needs the intensity of the whole projection image. I have tried
> to calculate the air intensity. Use the intensity to calculate the
> ln(image), and get the result A. On the other hand, I use the FDK
> reconstruct the 3D image and then forward projection by forward projection
> filtered to get the matrix B.
> Then, I calculated C=A-B. The std(C) is about 0.45*std(A) and mean(C) is
> about 0.46*mean(A). There is a big different between A and B. How can i get
> the true intensity that FDK uses to reconstruct?
> Thanks a lot!
>
>
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