[Gate-users] monochromatic X-ray source

[Howard]

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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