Method and system for performing CT image reconstruction with motion artifact correction

A computed tomography (CT) system, comprising:

• an x-ray source and x-ray detectors configured to helically scan an object at a low pitch resulting in overscanning at least a portion of the object, the detector obtaining attenuation measurements from the object as the object is moved in a Z-direction;
• a computer module identifying first and second portions of a region of interest (ROI) in the object, the second portion including an organ of interest (OOI) within the ROI, the first portion differing from the second portion;
• an x-ray controller providing a first tube current to drive the x-ray source when scanning the first portion and providing a different second tube current to drive the x-ray source when scanning the second portion, the scanning of the first portion and the second portion performed during a single scanning operation, with reduced current above and below the OOI;
• and
• a reconstruction module configured to reconstruct an image of the object utilizing redundancy resulting from the overscanning to enhance a signal to noise ratio of the OOI otherwise resulting from the reduced current above and below the OOI,
• wherein at least one of the first and second tube currents are modulated based on a physiologic parameter.