[Gate-users] Source definition in STL complex geometry

[Josh Knowland]

Hello Ashok, I do this too. Here is how:

Define geometry using STL. Location and size are from the STL file itself. Make sure your STL file is saved in the units you want.

	/gate/world/daughters/name Cube1
	/gate/world/daughters/insert tessellated
	/gate/Cube1/geometry/setPathToSTLFile ../STL_Files/Cube1.stl
	/gate/ Cube1/setMaterial Water

Then create a source that is larger than your STL file's bounding box. It is best to calculate the bounding box of the STL because making the source much much larger impacts performance.

Once you know the size of the source based on the bounding box, create it like this

	/gate/source/addSource src_Cube1
	/gate/source/ src_Cube1/gps/particle e+
	/gate/source/ src_Cube1/gps/energytype Fluor18
	/gate/source/ src_Cube1/setForcedUnstableFlag true
	/gate/source/ src_Cube1/setForcedHalfLife 6586 s
	/gate/source/ src_Cube1/setActivity 0.01 mCi
	/gate/source/ src_Cube1gps/type Volume
	/gate/source/ src_Cube1/gps/shape Para
	/gate/source/ src_Cube1/gps/centre 0.000 0.000 0.000 mm
	/gate/source/ src_Cube1/gps/halfx 50.000 mm
	/gate/source/ src_Cube1/gps/halfy 50.000 mm
	/gate/source/ src_Cube1/gps/halfz 50.000 mm
	/gate/source/ src_Cube1/gps/angtype iso
	/gate/source/ src_Cube1/gps/confine Cube1_phys

It is important that the source "src_Cube1" encompasses the geometry "Cube1" from the STL. Also, you have to add "_phys" to the end of you geometry name in the confine statement at the end.

I hope this helps,
Josh	





-----Original Message-----
From: Gate-users <gate-users-bounces at lists.opengatecollaboration.org> On Behalf Of Ashok Tiwari
Sent: Tuesday, January 15, 2019 12:03 PM
To: gate-users at lists.opengatecollaboration.org
Subject: [Gate-users] Source definition in STL complex geometry

Hello Community, 

I was wondering about the background source definition in STL complex geometry. For my simulation, I made a STL file of human chest (closed volume, with interior organs as well), now I want to fill the volume with F-18 source (background). Is there a way to fill the geometry?

Regards, 
Ashok
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