[Gate-users] Change orientation of cone volume

[Matthew Strugari]

Hi Chris,

Have you tried specifying the rotation axis and angle with numerical values?

/gate/Tcone/placement/setRotationAxis 1 0 0
/gate/Tcone/placement/setRotationAngle 90 deg

Cheers,
Matthew

> On Sep 13, 2019, at 7:10 AM, Christopher Watanabe <chris.r.watanabe at gmail.com> wrote:
> 
> Hi everyone, 
> 
> I'm trying to create a pinhole collimater. So far, I have everything set up well, but the orientation is wrong with the preexisting orientation of the camera. (i.e. the primary axis of the pinhole should be the normal of the pixel grid) 
> 
> The code I have now is:
> 
> ## Volume at the front of the spect device for the collimator
> 
> /gate/front/daughters/name collimator
> /gate/front/daughters/insert box
> /gate/collimator/geometry/setXLength            44. mm
> /gate/collimator/geometry/setYLength            11.14 mm
> /gate/collimator/geometry/setZLength            44. mm
> /gate/collimator/placement/setTranslation       0. -0.2 0. mm
> /gate/collimator/setMaterial                    Air
> 
> # Square of tungsten with correct thickness at the wider base (crystal side) 
> /gate/collimator/daughters/name              base
> /gate/collimator/daughters/insert            box
> /gate/base/geometry/setXLength     44. mm
> /gate/base/geometry/setYLength       1 mm
> /gate/base/geometry/setZLength     44. mm
> /gate/base/placement/setTranslation 0. -0.2 0. mm
> /gate/base/setMaterial Tungsten
> 
> # Cone of tungsten for collimation
> /gate/collimator/daughters/name        Tcone
> /gate/collimator/daughters/insert      cone
> /gate/Tcone/geometry/setRmin1   0 mm
> /gate/Tcone/geometry/setRmax1   3 mm
> /gate/Tcone/geometry/setRmin2   0 mm
> /gate/Tcone/geometry/setRmax2   25 mm
> /gate/Tcone/geometry/setHeight   11.14 mm
> /gate/Tcone/placement/setTranslation       0. -0.2 0. mm
> /gate/Tcone/setMaterial    	  Tungsten
> 
> # Cone of Air within the cone of tungsten
> /gate/Tcone/daughters/name        hole2
> /gate/Tcone/daughters/insert     cone
> /gate/hole2/geometry/setRmin1  	0 mm
> /gate/hole2/geometry/setRmax1  	2 mm
> /gate/hole2/geometry/setRmin2  	0 mm
> /gate/hole2/geometry/setRmax2  	24 mm
> /gate/hole2/geometry/setHeight 11.14 mm
> /gate/hole2/placement/setTranslation       0. -0.2 0. mm
> 
> So, basically, the hollow tungsten cone should be within the air volume allocate for the collimator. The primary axis of the cone is along the z direction though, so I get the following visualization:
> 
> <image.png>
> As you can see, the solid red cone (pinhole) is oriented along the z-axis, whereas the rest of the SPECT device is oriented along the y axis...
> 
> Things I've tried: 
> /gate/Tcone/placement/alignToY - This command just centers it along the y axis. Doesn't change the primary axis. 
> /gate/Tcone/placement/setRotationAxis + /gate/Tcone/placement/setRotationAngle - Also doesn't yield any helpful changes.
> 
> I'd appreciate any help! 
> 
> Cheers!
> 
> Chris
> 
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