1. A method of controlling a stability of response of a semi-conductor matrix imager comprising a plurality of pixels, the method comprising: a first phase of characterizing the stability of pixels, the first phase comprising: irradiating the pixels of a detector with a gauge radiation that is constant over time for a first predetermined duration; storing signals delivered by each pixel at regular time intervals for the first predetermined duration; determining, for each pixel, an amplitude distribution of the signals delivered by each pixel wherein the amplitude distribution of each pixel is a histogram, including the number of occurrences of signals as a function of amplitude; characterizing each distribution with a statistical indicator representative of a dispersion of the distribution; and classifying each pixel, on the basis the indicator for the pixel, into one of at least two categories of pixels, each category being representative of the stability of the temporal response of the pixels, the first category representing stable pixels, and the second category representing unstable pixels; and a second phase of correcting the stability of unstable pixels, the second phase comprising: associating each unstable pixel with a stable pixel according to a criterion of relative position; irradiating the pixels with a radiation to be characterized for a second predetermined duration; storing signals delivered by each pixel for at least one time interval during the said second predetermined duration; and correcting the signal generated by each unstable pixel by multiplying the signal of the associated stable pixel by a ratio between the signal of said unstable pixel at an initial moment and the signal of the stable pixel associated to said unstable pixel at said initial moment according to a following relation: 
 S* unstable ( t )= S unstable ( t 0)×( S stable ( t )/ S stable ( t 0)) t0 being the initial moment and t being time.