Patent ID: 7649175

Claim:
A method of reducing errors resulting from a temporal shift between an analog pulse and digital sampling intervals, the method comprising: generating a correction table which assigns a correction factor for a plurality of codes, each of the codes corresponding to a relationship between a subset of digital samples in a calibration signal which is similar in shape to the analog pulse, generating the correction table including for a plurality of calibration sample sets in which calibration pulses are shifted in time relative to a sampling interval: sampling the calibration pulses at a plurality of spaced intervals to generate a set of calibration digital samples; determining an integration which is a function of the digital samples in the selecting the subset of the digital samples; determining a correction factor which relates the integration of the set of samples to an integration of a set of digital samples in which the first sample is taken at a fixed point of reference; and assigning a code to the subset of digital samples which relates to a relationship amongst the samples in the subset and assigning the correction factor to the code; digitally sampling the analog pulse with an analog to digital converter at a plurality of spaced sampling intervals to generate a set of digital samples; determining an integral from the samples in the set; from the correction table and the subset of the set of digital samples, determining the correction factor corresponding to the subset of digital samples; applying the correction factor to the integral to generate a corrected integral value; restructuring an image from a plurality of the analog pulses and the corrected integral values; and display the reconstructed image on a display device.