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. 2017 Feb 3;7:41511. doi: 10.1038/srep41511

Figure 1. Schematic explanations of gamma-ray reconstruction, the PSF and coordinates systems.

Figure 1

(a) Schematic diagram of the PSFs of the CC and ETCC on the imaging plane (laboratory coordinates). An image of a point source is displayed with event circles reconstructed in CC. Here ζ and η denote two angles of an incident gamma. (b) Schematic explanation of the Compton scattering kinematics. The parameters θ and ϕ denote the Compton-scattering angle and electron-azimuthal angles of the incident gamma, respectively, on the Compton coordinates. (c) Coordinate diagram for explanation of the angles of ζ, η, and θ in the laboratory coordinates x-y-z. (d) Schematic explanation of PSF(Θ) of the CC and ETCC. See text for the definition of Θ.