Gamma ray detection system, of the gamma camera type, comprising • a gamma ray source, • at least one fast scintillator plate having a time of rising to the light peak which is less than 1 ns: - in which an interaction with said gamma ray produces scintillation events which generate UV photons, - comprising a diffusing entry surface and a polished exit surface, - having a thickness greater than or equal to 10 mm, • a photodetector comprising a plurality of segments detecting the photons emitted by said plate, • dedicated reader microelectronics of the ASIC type, receiving the photon detections of the photodetector, the system being characterised in that: • the photodetector and the reader microelectronics are capable of receiving the photons of said plate, • the system is capable of: - measuring a first trigger T1, corresponding to the moment of impact of the first photon detected on each of the segments of the photodetector, - measuring a spatial and temporal distribution of the first photons received on the adjacent segments, following this first trigger T1, for a given length of time greater than 100 ps and less than or equal to the time of rising to the light peak of the scintillator, in order to determine the spatial coordinates (X1, Y1) of an event "el", - using the differences in spatial and temporal distribution of the first photons detected around the event "e1" due to said given length of time, discriminating between the scattered photons and unscattered photons and determining the radius of a disc centred around the event "e1" in which the unscattered photons are concentrated, then determining the distance (or depth of interaction Z) at which the interaction which generated the photons detected occurred, and thus reconstructing the spatiotemporal coordinates (X1, Y1, Z1, T1) of said scintillation event produced by said interaction. • a gamma ray source, • at least one fast scintillator plate having a time of rising to the light peak which is less than 1 ns: - in which an interaction with said gamma ray produces scintillation events which generate UV photons, - comprising a diffusing entry surface and a polished exit surface, - having a thickness greater than or equal to 10 mm, - in which an interaction with said gamma ray produces scintillation events which generate UV photons, - comprising a diffusing entry surface and a polished exit surface, - having a thickness greater than or equal to 10 mm, • a photodetector comprising a plurality of segments detecting the photons emitted by said plate, • dedicated reader microelectronics of the ASIC type, receiving the photon detections of the photodetector, • the photodetector and the reader microelectronics are capable of receiving the photons of said plate, • the system is capable of: - measuring a first trigger T1, corresponding to the moment of impact of the first photon detected on each of the segments of the photodetector, - measuring a spatial and temporal distribution of the first photons received on the adjacent segments, following this first trigger T1, for a given length of time greater than 100 ps and less than or equal to the time of rising to the light peak of the scintillator, in order to determine the spatial coordinates (X1, Y1) of an event "el", - using the differences in spatial and temporal distribution of the first photons detected around the event "e1" due to said given length of time, discriminating between the scattered photons and unscattered photons and determining the radius of a disc centred around the event "e1" in which the unscattered photons are concentrated, then determining the distance (or depth of interaction Z) at which the interaction which generated the photons detected occurred, and thus reconstructing the spatiotemporal coordinates (X1, Y1, Z1, T1) of said scintillation event produced by said interaction. - measuring a first trigger T1, corresponding to the moment of impact of the first photon detected on each of the segments of the photodetector, - measuring a spatial and temporal distribution of the first photons received on the adjacent segments, following this first trigger T1, for a given length of time greater than 100 ps and less than or equal to the time of rising to the light peak of the scintillator, in order to determine the spatial coordinates (X1, Y1) of an event "el", - using the differences in spatial and temporal distribution of the first photons detected around the event "e1" due to said given length of time, discriminating between the scattered photons and unscattered photons and determining the radius of a disc centred around the event "e1" in which the unscattered photons are concentrated, then determining the distance (or depth of interaction Z) at which the interaction which generated the photons detected occurred, and thus reconstructing the spatiotemporal coordinates (X1, Y1, Z1, T1) of said scintillation event produced by said interaction.