Fig. 1. Schematic of imaging principle of a Compton camera

Fig. 2. Diagram of integrated structure (a) and separated structure (b) of a Compton camera

Fig. 3. Diagram of DT-PA02 type-pixel CZT detector

Fig. 4. Energy spectra of ⁵⁷Co (a) and ¹³⁷Cs (b) for a single pixel-type CZT detector after calibration

Fig. 5. Block diagram of VATAGP9

Fig. 6. Block diagram of the electronic system design scheme for Compton scattering detection

Fig. 7. Snapshot of the Compton imaging system (a) Front-end, (b) Back-end

Fig. 8. Schematic diagram of imaging space setting

Fig. 9. Angle resolution results of the imaging systems (a) Approximately 20° apart for θ, (b) Approximately 15° apart for θ, (c) Approximately 10° apart for θ, (d) Approximately 30° apart for φ, (e) Approximately 20° apart for φ, (f) Approximately 10° apart for φ

Fig. 10. Results of the 3D position recognition function of the imaging system (a) The source is located at (0 cm, 0 cm, 500 cm), (b) The source is located at (0 cm, 0 cm, 600 cm)

Fig. 11. Angular resolution test results of the imaging system after increasing the layer spacing (a) Approximately 5° apart for θ, (b) Approximately 10° apart for θ, (c) Approximately 20° apart for θ, (d) Approximately 30° apart for φ, (e) Approximately 40° apart for φ

Fig. 12. Schematic diagram of the moving mode for the absorber layer of imaging device

Fig. 13. Angular resolution test results of imaging systems with different absorption layer detection area (a) Approximately 4° apart for θ, (b) Approximately 5° apart for θ, (c) Approximately 8° apart for φ, (d) Approximately 10° apart for φ