Single planar detector monte carlo simulations
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Single Planar Detector Monte Carlo Simulations. Andrew Mather. [email protected] Introduction - Simulation. Simulations run of a single 6 x 6 x 2 cm Germanium crystal. Point isotropic source @ 10cm from the front face of the crystal, 10 million gamma’s emitted. (100-1000 keV step 10 keV)

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Single Planar Detector Monte Carlo Simulations

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Single planar detector monte carlo simulations

Single Planar Detector Monte Carlo Simulations

Andrew Mather

[email protected]


Introduction simulation

Introduction - Simulation

  • Simulations run of a single 6 x 6 x 2 cm Germanium crystal.

  • Point isotropic source @ 10cm from the front face of the crystal, 10 million gamma’s emitted.

    (100-1000 keV step 10 keV)

  • The same (geometric wise) simulation reproduced in GEANT 4 & MCNP [G.Turk].

  • Both simulations output all interaction positions and energies in the same format.

  • Results produced from this file for both codes using the same analysis software (Java).


Introduction packing

Introduction - Packing

  • The analysis program uses a packing algorithm that packs any interaction points closer together than a specified amount into a single point.

  • Packing is used to make simulated results more comparable to real detectors.

  • Takes the average positions of the points to be packed and a sum of the energy deposited at each point.

  • Using 1mm currently as the maximum distance apart two interactions have to be for a “real” detector to be able to resolve them as two individual interactions.


Single planar detector monte carlo simulations

  • Event defined as a gamma ray depositing some energy in the detector.

  • Interactions can be Compton or Photoelectric.

  • @ 511 keV Photo-peak events = ~ 2.5 interactions


Single planar detector monte carlo simulations

  • Full energy event is an event where all the energy is deposited in the detector.

  • @ 511 keV : Geant = 29% MCNP = 36%


Single planar detector monte carlo simulations

  • First Interaction – The actual first time the gamma-ray interacts.

  • Main Interaction – The interaction depositing the most energy.

  • @ 511 KeV : 70% of the time the first interaction = main interaction


Single planar detector monte carlo simulations

  • When the first interaction isn’t the main interaction – What is the average distance between the two?

  • (Important to know if we make the assumption on real data to give and idea of how the imaging will be affected as a result)


Single planar detector monte carlo simulations

Definition of Angle

Detector

Main Interaction

First Interaction

θ

Point Source


Single planar detector monte carlo simulations

~ 8.7mm perpendicular from line joining source and first interaction position.


Single planar detector monte carlo simulations

Current & Future Work

  • Simulation with two planar detectors and back to back 511 keV emitting source.

  • Look at imaging from interaction position file using both first interaction is the main interaction assumption and with the true first interaction.

2D Image reconstruction using BP

Geant 4 visual of two detectors

Image reconstruction from Geant 4 data


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