| 摘要 |
A CT angiography apparatus (10) compensates for respiratory motion. During a helical scan, a radiation source (16) and a detector (18) generate data sets corresponding to a plurality of sub- volumes of a blood vessel over a plurality of cardiac cycles. Sub- volume data sets corresponding to a selected cardiac phase are reconstructed (40) into a plurality of sub- volume images (54'1, 54'2, 54'3). Characteristic points (561, 562, 563) in the sub-volume images are identified. A computer routine or processor (48) calculates a respiratory motion vector based on the identified characteristic points in a plurality of the sub-volume images. An image reconstruction routine or processor (50) reconstructs the original sub-volume data (36) in the selected cardiac phase into a volume image representation (50') using the calculated respiratory motion vector. |
