A comparison of prospective and retrospective respiratory navigator gatingin 3D MR coronary angiography

A comparison between the prospective and retrospective respiratory navigato r gating in MR coronary angiography was performed with eight normal subject s. A three-dimensional (3D) ECG-gated fast gradient echo pulse sequence was used for image data acquisition. The results show that the MR coronary ang iography obtained using retrospective gating retains a considerable amount of motion artifacts. In this study, the images acquired using prospective n avigator gating demonstrated significantly reduced motion artifacts (p = 0. 009), improved vessel visibility (p = 0.021) with reduced imaging time (p = 0.013) compared to the images obtained using retrospective navigator gatin g.