3D MR angiography of pulmonary arteries using realtime navigator gating and magnetization preparation

摘要: An ECG-triggered magnetization-prepared segmented 3D fast gradient echo sequence was developed to perform pulmonary arterial MR angiography. A selective inversion recovery pulse used in the magnetization preparation suppress venous vasculature. real-time gating technique based on navigator echoes implemented reduce respiration effects. Pencil-beam were acquired immediately before and after readout train processed dynamically measure diaphragm position, which control data acquisition with an accept-or-reject-reacquire logic. In a study of 10 volunteers, gated 28 slices required average approximately 4 min time, six seven segmental arteries related interlobar trunk artery depicted. The use SIR reduced signal by 99%. acquisitions superior ungated (n = 10, P < 0.005). is effective for reduction effects thereby makes high resolution MRA feasible.