A method of mass spectrometry is disclosed comprising pulsing ions into a time of flight region and detecting the ions using an ion detector. The signal output from the ion detector is digitized to produce a digitized signal. The peak area A1 and arrival time T1 of the ion peak are determined and a degree to which the ion peak suffers from saturation is also determined. A corrected area A′1 of the ion peak is then determined based upon the degree to which the ion peak was determined to suffer from saturation.