Respiratory and Cardiac Self-Gated Free-Breathing Cardiac CINE Imaging with Multi-Echo 3D Hybrid Radial SSFP Acquisition

摘要

A respiratory and cardiac self-gated free-breathing 3D cine SSFP imaging method using multi-echo hybrid radial sampling is presented. Cartesian mapping of the k-space center along the slice encoding direction provides intensity-weighted position information, from which both respiratory and cardiac motions are derived. With radial sampling in plane every TR, no extra scan time is required for sampling the k-space center. Temporal filtering based on density compensation is used for radial reconstruction to achieve high SNR and CNR. High correlation between the self-gating signals and external gating signals is demonstrated. This respiratory and cardiac self-gated free-breathing 3D radial cardiac cine imaging technique provides image quality comparable to that acquired with the multiple breath-hold 2D Cartesian SSFP technique in short axis, four chamber and two chamber orientations. Functional measurements from the 3D cardiac short axis cine images are found to be comparable to those obtained using the standard 2D technique.