An apparatus comprising: a photon detector including: a detector array comprising single photon avalanche diode (SPAD) detectors configured to break down responsive to impingement of a photon, trigger circuitry configured to generate a trigger signal responsive to break down of a SPAD detector of the detector array, latches (20, 22) configured to store position coordinates of SPAD detectors of the detector array that are in break down, the latches being configured to latch responsive to a trigger signal generated by the trigger circuitry, characterized in that the apparatus further comprises at least one delay element (40, 42) that delays propagation of the trigger signal to the latches (20, 22) by an integration time interval over which position data for photon detection events is accumulated, wherein after the integration time interval terminates the latching of the latches (20, 22) is performed, such that the latches (20, 22) after latching provide position coordinates for the SPAD detectors that break down over the integration time interval, wherein the latches (20, 22) comprise: row latches wherein each row latch connects with a logical "OR" combination of SPAD detectors of a corresponding row of the detector array; and column latches wherein each column latch connects with a logical "OR" combination of SPAD detectors of a corresponding column of the detector array. a photon detector including: a detector array comprising single photon avalanche diode (SPAD) detectors configured to break down responsive to impingement of a photon, trigger circuitry configured to generate a trigger signal responsive to break down of a SPAD detector of the detector array, latches (20, 22) configured to store position coordinates of SPAD detectors of the detector array that are in break down, the latches being configured to latch responsive to a trigger signal generated by the trigger circuitry, a detector array comprising single photon avalanche diode (SPAD) detectors configured to break down responsive to impingement of a photon, trigger circuitry configured to generate a trigger signal responsive to break down of a SPAD detector of the detector array, latches (20, 22) configured to store position coordinates of SPAD detectors of the detector array that are in break down, the latches being configured to latch responsive to a trigger signal generated by the trigger circuitry, characterized in that the apparatus further comprises at least one delay element (40, 42) that delays propagation of the trigger signal to the latches (20, 22) by an integration time interval over which position data for photon detection events is accumulated, wherein after the integration time interval terminates the latching of the latches (20, 22) is performed, such that the latches (20, 22) after latching provide position coordinates for the SPAD detectors that break down over the integration time interval, row latches wherein each row latch connects with a logical "OR" combination of SPAD detectors of a corresponding row of the detector array; and column latches wherein each column latch connects with a logical "OR" combination of SPAD detectors of a corresponding column of the detector array.