A cardiac gating method using a navigator MR signal requires the additional acquisition steps interleaved with the acquisition of image signals. To eliminate the additional acquisitions for navigators, the proposed method obtains an image signal and a navigator signal at the same time, and separates them in post-processing. Cardiac motion information estimated from the separated navigators is used for retrospective cardiac gating. To demonstrate the feasibility of the proposed method, in-vivo experiments were performed for cardiac MRI with short axis view.
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