User gate manual

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GATE combines the advantages of the GEANT4 simulation toolkit well-validated physics models, sophisticated geometry description, and powerful visualization and 3D rendering tools with original features specific to emission tomography. An application layer allows for the implementation of user classes derived from the core layer classes, e.

One of the most innovative features of GATE is its capability to synchronize all time-dependent components in order to allow a coherent description of the acquisition process. As for the geometry definition, the elements of the geometry can be set into movement via scripting. All movements of the geometrical elements are kept synchronized with the evolution of the source activities.

For this purpose, the acquisition is subdivided into a number of time-steps during which the elements of the geometry are considered to be at rest. Decay times are generated within these time-steps so that the number of events decreases exponentially from time-step to time-step, and decreases also inside each time-step according to the decay kinetics of each radioisotope.

This allows for the modeling of time-dependent processes such as count rates, random coincidences, or detector dead-time on an event-by-event basis. In GATE, detector electronic response is modeled as a linear processing chain designed by the user to reproduce e. The first users guide was organized as follow: chapter 1 of this document guides you to get started with GATE.

The macro language is detailed in Chapter 2. Visualisation tools are described in Chapter 3. Then, Chapter 4 illustrates how to define a geometry by using the macro language, Chapter 5 how to define a system, Chapter 6 how to attach sensitive detectors, and Chapter 7 how to set up the physics used for the simulation. Chapter 8 discusses the different radioactive source definitions. Chapter 9 introduces the digitizer which allows you to tune your simulation to the very experimental parameters of your setup.