[Gate-users] Would you please tell me if there is some lessons on internet for me to learn the physics process of x-ray imaging?

[Zhou, Zhongxing]

Dear all,

I will this email finds you all well. Having study for a few weeks  on Gate, I feel that I really need more knowledge on x-ray imaging process. My major is biomedical engineering, but I have not taken any classes about x-ray imaging process. I am always confusing about the physics process of x-ray imaging. 

Would you please tell me if there is some lessons on internet for me to learn the physics process of x-ray imaging? It will be great if you can provide some website having videos of these classes. 


Thank you in advance,
Erickzhou



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Subject: Gate-users Digest, Vol 101, Issue 20

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Today's Topics:

   1. Dose actor calculations (Nada Fakhoury)


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Message: 1
Date: Fri, 17 Oct 2014 09:51:58 +0000
From: Nada Fakhoury <nfachour at physics.auth.gr>
To: gate-users at lists.opengatecollaboration.org
Subject: [Gate-users] Dose actor calculations
Message-ID:
        <20141017095158.Horde.0k_wkT0OvWruCblk1K4MDQ1 at mail.physics.auth.gr>
Content-Type: text/plain; charset=UTF-8; format=flowed; DelSp=Yes


Dear all,

I am experiencing a weird behavior of the dose actor. I am simulating
a gamma source pointing towards a water volume.

I first tried acquiring a depth dose curve along the central axis, and
got a distribution that didn't quite measure up to what I expected.
(dose increasing with depth)

See here:
https://www.dropbox.com/s/hd6da9lhapn5cju/Screenshot%20from%202014-10-11%2017%3A40%3A14.png?dl=0


When I then changed my actor's resolution to get a dose profile in
various depths in the volume, the distribution in depth was the
complete opposite of what the depth dose curve at first indicated.
(dose decreasing with depth)

See here: https://www.dropbox.com/s/e3610h1fhz5r8e6/profiles.png?dl=0

The setup is the same in both cases, the *only* thing that changed was
the actor's resolution and for the profiles the actor's position. (For
the central axis depth dose distribution the actor was attached at the
top of the volume.)


Does anyone have an idea of what may be wrong?

Thank you in advance,

Nada,


**Please ignore the dose values in the graphs, they were acquired with
different primary events and energies, but the overall behavior
remains the same in every case. The graphs are drafts.**






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