A nuclear medicine imaging device includes a radiation camera (10) including a plurality of photo-multiplier tubes (28). Each photo-multiplier tube (28) is configured with an analog to digital converter (30) which converts a detected scintillation event (50) to sampled digital values. A storage device is preloaded with an estimator function which can be derived from a calibration scintillation events. A processor in communication with both the camera (10) and the storage device, detects an event and combines the digital values which are sampled together to arrive at a total area or energy of the scintillation event. Alternately, if a second pulse is detected before the first scintillation event has ended, the area combining of the first event is stopped and a pulse tail is estimated from the estimator functions stored. This estimated tail is then added to the combined data values taken until the time of pile-up. Additionally, the estimated tail is subtracted from the combined data values for the second scintillation event.
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