Abstract: The invention concerns an evaluation apparatus (50) for evaluating gamma radiation events detected by a gamma camera (10) and identifying valid gamma radiation events, said (gamma camera (10) including a scintillator (12) for emitting scintillation photons (42) at photo conversion positions (44) in the scintillator (12) in response to incident gamma rays (22) and resulting gamma radiation events and a position-sensitive photodetector(14) for detecting emitted scintillation photons (42) and obtaining therefrom a spatial signal distribution (24). The invention further concerns a calibration apparatus (56) for in-situ calibrating a position-sensitive photodetector (14) of a gamma camera (10) for the detection of gamma radiation events.

Abstract: Spatial intensity distributions of scintillation photons emitted by the scintillator array (5) in response to multiple incident gamma rays in record are recorded (S10). Sets of coincidently emitted scintillation photons from the recorded spatial intensity distributions are determined (S22). The sets of coincidently emitted scintillation photons center-of-gravity positions (S24) and cumulative energies are determined (S26). A clustering analysis based on the determined center-of-gravity positions and cumulative energies to obtain clusters (26a, 26b, 33) of gamma ray events attributed to a scintillator array element is performed (15). A cluster (26a, 26b, 33) of the spatial intensity distributions is cumulated (S29) to determine a cumulative spatial intensity distribution of scintillation photons emitted in response to incident gamma rays in the scintillator array element.

Abstract: The present invention relates to a calibration method (100) for a gamma ray detector (3, 51) including a scintillator array (5) for emitting scintillation photons at photo conversion positions in response to incident gamma rays and a photodetector array (7) coupled thereto in light-sharing mode for determining a spatial intensity distribution of scintillation photons.

Abstract: The invention concerns an evaluation apparatus (50) for evaluating gamma radiation events detected by a gamma camera (10) and identifying valid gamma radiation events, said (gamma camera (10) including a scintillator (12) for emitting scintillation photons (42) at photo conversion positions (44) in the scintillator (12) in response to incident gamma rays (22) and resulting gamma radiation events and a position-sensitive photodetector(14) for detecting emitted scintillation photons (42) and obtaining therefrom a spatial signal distribution (24). The invention further concerns a calibration apparatus (56) for in-situ calibrating a position-sensitive photodetector (14) of a gamma camera (10) for the detection of gamma radiation events.

Abstract: The present invention relates to a method and a system for reducing interference between a non-MR imaging system (e.g. a PET imaging scanner) and an MR imaging system. The method comprises receiving at least a signal indicative of the MR RF signal detection period, and in response to the received signal, setting the state of at least a portion of the non-MR imaging system to an inactive state during at least a portion of the MR RF signal detection period.

Abstract: The subject matter of the invention is a method and an electronic circuit for reading the signals generated by one or more pixelated sensors in a gamma radiation detection system, which makes it possible to substantially reduce the number of electronic channels to be digitized. The electronic circuit in the invention is analog and can also be coupled to other similar circuits in order to acquire the signals from larger sensors.

Abstract: The subject matter of the invention is a method and an electronic circuit for reading the signals generated by one or more pixelated sensors in a gamma radiation detection system, which makes it possible to substantially reduce the number of electronic channels to be digitized. The electronic circuit in the invention is analogue and can also be coupled to other similar circuits in order to acquire the signals from larger sensors.