[ITK] Question about CBCT projection data

Thu Aug 24 11:16:11 EDT 2017

Hello Atallah,

If possible I would recommend that you correspond with the vendor of your machine to ensure that you are interpreting the data correctly. Based on my experience with CBCT I suspect that the original projection image size, which matches the machine’s calibration, is rectangular and not square. Some vendors modify the original size to accommodate for viewers that expect square images. Exporting the same dataset in two different ways on a machine I used resulted in images with different sizes.

Sample data and matlab code for interpreting such images can be found in this MIDAS repository: http://midas.kitware.com/community/view/34

        hope this helps
                Ziv

From: Atallah Baydoun <axb724 at case.edu>
Date: Thursday, August 24, 2017 at 11:04 AM
To: Dženan Zukić <dzenanz at gmail.com>, "community at itk.org" <community at itk.org>
Subject: Re: [ITK] Question about CBCT projection data

Each projection in a CBCT is stored in a his file.
I read the his file in matlab using a function that I found online.
I get a 512*512 matrix of uint16.

Thank you for the help!

Atallah

On Thu, Aug 24, 2017 at 11:00 AM, Dženan Zukić <dzenanz at gmail.com<mailto:dzenanz at gmail.com>> wrote:
Hi Atallah,

if you could share the said .his file we might help you. How do you get the matrix from that file?

Regards,
Dženan Zukić, PhD, Senior R&D Engineer, Kitware (Carrboro, N.C.)

On Thu, Aug 24, 2017 at 10:40 AM, Atallah Baydoun <axb724 at case.edu<mailto: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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