Patent ID: 7664221
Filing Date: 2010-02-16
Classification: A61B,G06T,Y10S

Abstract:
1. A method for producing computed tomograms of a patient's beating heart, comprising: rotating at least one X-ray tube relative to and about the patient and about a system axis, to scan the patient; recording a pulse-correlated clock signal of the patient to determine a cycle phase and a cycle of the heart; continuously detecting attenuation of the X-rays during the rotation of the at least one X-ray tube and outputting detected data; dividing the scanning volume into small three-dimensional voxels, and searching, in relation to each voxel, for beams, and detected output data generated therefrom, that intersect the voxel; reconstructing incomplete voxel values from the voxel-referred detected output data, the detected data used per voxel reconstruction including a scanning segment that corresponds only to a fraction of a half revolution; assigning each of the reconstructed incomplete voxel values a time stamp from the cycle phase, where the cycle from which the reconstructed incomplete voxel value has been reconstructed is determinable; storing each of the assigned reconstructed incomplete voxel values; adding up, for a first calculation of at least one complete voxel value from a first cardiac phase period, the stored reconstructed incomplete voxel values from the first cardiac phase period, until a sum of the scanning segments of the stored reconstructed incomplete voxel values corresponds to at least 180°; and adding up, for a second calculation of at least one complete voxel value from a second cardiac phase period, the stored reconstructed incomplete voxel values from the second cardiac phase period, until a sum of the scanning segments of the stored reconstructed incomplete voxel values corresponds to at least 180°, the first cardiac phase period and the second cardiac phase period overlapping.