How to create a conical source (mamography) in Vgate

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SUMMARY

The discussion focuses on creating a conical source in Vgate software, specifically a conical beam with a radius of 4 cm and a length of 16 cm. Users are advised to set the angular distribution of emission and define minimum and maximum emission angles using specific commands. The parameters include setting the angular type to isotropic and defining the emission angles in degrees. The discussion emphasizes the importance of adjusting these parameters to achieve the desired conical beam effect in the Z direction.

PREREQUISITES
  • Familiarity with Vgate software
  • Understanding of conical beam geometry
  • Knowledge of angular distribution in source emission
  • Basic skills in using command-line parameters for simulation settings
NEXT STEPS
  • Research Vgate command syntax for source configuration
  • Learn about angular distribution types in radiation sources
  • Explore methods for optimizing conical beam parameters
  • Investigate the effects of emission angles on beam quality
USEFUL FOR

This discussion is beneficial for medical physicists, radiation safety officers, and software developers working with Vgate who are involved in simulating conical sources for mammography applications.

Alexander Camargo
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I am new in Vgate software.
I've tried a lot of things, but nothing works. I need to create a conical source that is 4 cm in radius and 16 cm in length. Example in photo attached
exemplo do que preciso.png
 
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Do you mean a conical source, a conical shaped volume which emits, or do you mean a conical beam? You can set min and max emission angles for sources.
 
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Alex A said:
Do you mean a conical source, a conical shaped volume which emits, or do you mean a conical beam? You can set min and max emission angles for sources.
conical beam with a focal spot of 0.3mm. The focal spot is not problema, my problem is create a conical beam
 
A conical beam for a point source is produced with a circular aperture.

Conical beam.png
 
A shadow mask is functional but may be inefficient.

Consider editing the source parameters to something like;

Code: 
# SET THE ANGULAR DISTRIBUTION OF EMISSION
/gate/source/yoursourcename/gps/angtype iso
# SET MIN AND MAX EMISSION ANGLES
/gate/source/yoursourcename/gps/mintheta 0. deg
/gate/source/yoursourcename/gps/maxtheta 14. deg
/gate/source/yoursourcename/gps/minphi    0. deg
/gate/source/yoursourcename/gps/maxphi 360. deg

This is the spherical physics coordinate system. This should produce a conical beam in the Z direction.

Redo the trig to get a more accurate angle if you need it.
 
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