[ITK] Question about CBCT projection data

[Lambert Zijp]

Hi Atallah,

Square CBCT projection images are quite common. You need quite a lot to be
able to reconstruct a 3D volume from them (500 or so).
High pixel values mean low densities encountered when a conical beamlet
travels through tissue. Taking the logarithm will get you the radiological
thickness of that tissue. First, a dark field and a flood field correction
need to be applied if not already done; I need to see an example to be able
to tell.

Greetings, Lambert

On Thu, Aug 24, 2017 at 4:40 PM, Atallah Baydoun <axb724 at case.edu> wrote:

> Hello,
>
> I am new to image processing and I have started recently working on CBCT.
> I was able to export .his file that yields a 512*512 matrix.
>
> I am having difficulty in the interpretation of this matrix.
>
> Can anyone tell me how is the value of the X ray projection I/I0 related
> to the numbers in the matrix ?
>
> Thank you,
> Atallah
>
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