1. Method for estimating an arrival time value of arterial pressure pulses (PAT value) of a subject from a sequence of electrical impedance tomography (PIT) images, comprising: providing an EIT imaging device adapted to record impedance signal distribution (EIT image) within a measurement region of the subject; measuring a sequence of temporally discrete EIT images during a predetermined measuring time period in the measurement region using the EIT imaging device, each EIT image comprising one or a plurality of EIT pixel subsets, each of said one or a plurality of EIT pixel subset representing an impedance value; generating one or a plurality of time series, each of said one or a plurality of time series representing a variation of the impedance value of the sequence of one or plurality of EIT pixel subsets; and estimating the PAT value from each of said one or a plurality of time series.