Patent ID: 7443947
Filing Date: 2008-10-28
Classification: A61B,G01T,H03M

Abstract:
1. A CT scanner, comprising: a means for rotating a radiation source around an examination region; a means for generating an analog data signal that varies with an intensity of radiation traversing the examination region; a means for converting the analog data signal to a digital data signal including aperiodic pulses varying in frequency with the intensity of the radiation traversing the examination region as the radiation source rotates about the examination region and adding a minimized offset signal to the analog data signal prior to the converting so that the intensity of the analog data signal is such that at least one aperiodic pulse occurs on the digital data signal ever 2-½ data intervals; a means for producing a time signal indicative of data intervals; a means for determining average radiation intensity in each data interval by counting the pulses of the digital data signal starting with a digital data signal pulse occurring in a preceding data interval and continuing to a digital data signal pulse occurring in a succeeding data interval.