[Gate-users] monochromatic X-ray source

Thu May 12 14:03:09 CEST 2022

Hi Howard,

Your way of implementing the monoenergetic x-rays seems fine to me, though I am happy for someone to correct me on this. As far as the contrast goes however, it may be that you are not seeing the contrast due to the relatively low energies you are using (10 - 30 keV), as at this energy I would expect fairly significant attenuation fromthe water alone.

Perhaps try an 80 keV monoenergetic beam and see if you can distinguish bone and water then?

Olie

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Sent: 12 May 2022 11:00
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Subject: Gate-users Digest, Vol 192, Issue 9

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Today's Topics:

   1. Managing large number of primaries in acceptable time     frame
      (Mijat Paunovic)
   2. Re: monochromatic X-ray source (Howard)

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Message: 1
Date: Wed, 11 May 2022 22:32:18 +0200
From: Mijat Paunovic <paunovicjata at gmail.com>
To: gate-users at lists.opengatecollaboration.org
Subject: [Gate-users] Managing large number of primaries in acceptable
        time    frame
Message-ID:
        <CAKS_kRpLP4+oXobz7FsLDpB=PMT1RybBDOSmSLmGtVYd2EAN6Q at mail.gmail.com>
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Dear Gate Community,
I am trying to run a CT simulator with realistic number of primaries which
I found was around 10^13 per projection. I am using HTCondor to make use of
all my hardware resources but this still doesn't get even close in
reasonable amount of time.
I was wondering if anyone is running such large number of primaries and if
they would be kind enough to share some advice on this. I realized that GPU
parallel processing is no longer an option in Gate, I am already using
HTCondor to split my main.mac script on all of the available processors,
and have already disabled the processes that are of no interest for the
output that I care about.
Kind regards,
Mijat Paunović
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Message: 2
Date: Wed, 11 May 2022 21:44:08 -0400
From: Howard <lomahu at gmail.com>
To: Ashok Tiwari <tiwarias at yahoo.com>
Cc: Gate-users <gate-users at lists.opengatecollaboration.org>
Subject: Re: [Gate-users] monochromatic X-ray source
Message-ID:
        <CAKr9h5VT-KhyBDqpho5r3rvrqFp5A3YLUWt2p9kywOJ47rpt0A at mail.gmail.com>
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Apparently I was too quick in answering Ashok. Actually there is a problem,
ie, no contrast for the materials. I tried 10 keV and 30 keV with different
materials such as kidney, spinebone, cartilage, muscle etc with background
as water. It appears that I did not use the monoenergy X-ray correctly. Any
suggestions? Many thanks!

Howard

On Sun, May 8, 2022 at 5:15 PM Howard <lomahu at gmail.com> wrote:

> Hi Ashok,
>
> It is now working. Thank you for your help!
>
> Howard
>
> On Sun, May 8, 2022 at 3:04 PM Ashok Tiwari <tiwarias at yahoo.com> wrote:
>
>> Hello Howard,
>>
>> It looks like you are missing *gps* command in your source definition.
>> See below for the working example (but using a point source, change that
>> for your need):
>>
>> /gate/source/addSource monoenergetic_xray gps
>> /gate/source/monoenergetic_xray/gps/particle gamma
>> /gate/source/monoenergetic_xray/gps/energytype Mono
>> /gate/source/monoenergetic_xray/gps/ene/mono 30. keV
>> /gate/source/monoenergetic_xray/gps/angtype iso
>> /gate/source/monoenergetic_xray/gps/centre 0. 0. -80. mm
>> /gate/source/monoenergetic_xray/gps/type Point
>> /gate/source/monoenergetic_xray/attachTo my_phantom
>> /gate/source/monoenergetic_xray/visualize 100 yellow 2
>> /gate/source/list
>>
>> Hope this helps.
>>
>> Thanks,
>> Ashok
>> On Sunday, 8 May 2022, 01:25:53 pm GMT-5, Howard <lomahu at gmail.com>
>> wrote:
>>
>>
>> Hi,
>>
>> I would like to simulate CBCT with a monoenergy X-ray source, say 30keV.
>> Is there an easy way to implement this? I tried to set the following in the
>> source macro but did not work. Do I have to set up the fluorescent X-ray
>> for the monochromatic source? Any feedback would be appreciated.
>>
>> Howard
>>
>> /gate/source/addSource xraygun
>> /gate/source/verbose 0
>> /gate/source/xraygun/gps/verbose 0
>> # Particle type
>> /gate/source/xraygun/gps/particle gamma
>> # Source geometry
>> /gate/source/xraygun/gps/type Plane
>> /gate/source/xraygun/gps/shape Rectangle
>> /gate/source/xraygun/gps/halfx 0.025 mm
>> /gate/source/xraygun/gps/halfy 0.025 mm
>> # Source position
>> /gate/source/xraygun/gps/centre 0. 0. -80. mm
>> # Emission direction
>> /gate/source/xraygun/gps/mintheta  0. deg
>> /gate/source/xraygun/gps/maxtheta 15. deg
>> /gate/source/xraygun/gps/angtype iso
>> # Energy distribution
>> /gate/source/xraygun/gps/energytype Mono
>> /gate/source/xraygun/gps/monoenergy 30.0 keV
>> /gate/source/list
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>
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