Patent ID: 9173627
Filing Date: 2015-11-03
Classification: A61B

Abstract:
1. An imaging system, comprising: a stationary gantry; two or more flags affixed to the stationary gantry and angularly offset from each other by a first angle; a rotating gantry rotatably supported by the stationary gantry and configured to rotate around an examination region; two or more sensors affixed to the rotating gantry and angularly offset from each other by a second angle, wherein the two or more sensors respectively detect a flag in response to rotating passed the flag and generate an output signal indicative thereof a radiation source, carried by the rotating gantry, that is configured to emit radiation that traverses the examination region; a detector array, carried by the rotating gantry and located opposite the radiation source across the examination region, that detects radiation that traverses the examination region, wherein the detector array detects radiation for a plurality of integration periods during a rotating gantry revolution, wherein the plurality of integration periods corresponds to different angular position ranges, and wherein the detector array generates a signal indicative of the detected radiation respectively for the plurality of integration periods; a timer that determines time durations between two flags and/or two sensors; and an integration period controller that generates an integration period timing signal that includes timing for a start of each of the integration periods for a revolution of the rotating gantry based at least on the time durations, which include a time duration of a previous revolution of the rotating gantry around the examination region, wherein the integration timing signal is used to trigger the plurality of integration periods, wherein the integration period controller generates an integration period error signal and corrects the integration period timing signal based on the integration error signal and an integration period timing error curve.