Patent ID: 7616730
Filing Date: 2009-11-10
Classification: A61B,Y10S

Abstract:
1. A method for carrying out a cardio-computed tomography (CT) examination of a patient using a CT system having at least two X-ray tubes on a gantry, comprising: recording a current electrocardiography (EKG) signal from the patient; moving at least one of the patient and the gantry, sequentially, relative to one another in a system axis direction; moving the at least two X-ray tubes, arranged at offset angles with respect to one another, on a circular path around the patient for scanning; measuring absorption data of the patient; and producing CT representations of the patient by selectively using the measured absorption data, wherein the moving the at least one of the patient and the gantry sequentially moves at least one of the patient and the gantry relative to one another to at least two positions, the moving the at least two X-ray tubes scans the patient using at least two different X-ray spectra at each of the at least two positions, the moving the at least two X-ray tubes first scans the patient using a first X-ray spectrum of the at least two different X-ray spectra at two of the at least two X-ray tubes at a first of the at least two positions, until the measuring gathers absorption data for parallel projections over a range of at least 180° from a first heart period, the moving the at least two X-ray tubes second scans the patient using a second X-ray spectrum of the at least two different X-ray spectra at the two of the at least two X-ray tubes at the first of the at least two positions, until the measuring gathers absorption data for parallel projections over a range of at least 180° from a second heart period, and the moving at least one of the patient and the gantry sequentially moves at least one of the patient and the gantry relative to one another to a second of the at least two positions after the moving the at least two X-ray tubes second scans the patient.