Patent ID: 8660313

Claim:
A method of CT angiography with respiratory motion compensation comprising: rotating a cone beam of radiation around a subject; collecting radiation attenuation data from radiation which has passed through a plurality of sub-volumes of the subject; longitudinally moving the subject and the cone beam of radiation relative to each other to generate a plurality of sub-volume data sets along a helical trajectory; selecting sub-volume data sets from the generated sub-volume data sets which are in a common cardiac phase; generating a plurality of sub-volume images in the common cardiac phase from the selected sub-volume data sets; identifying characteristic points in overlapping portions of the sub-volume images in the common cardiac phase; calculating a respiratory motion vector for at least some of the selected sub-volume data sets in the common cardiac phase based on the identified characteristic points; and reconstructing the generated sub-volume data sets into a volume image representation in accordance with the calculated respiratory motion vector.