Abstract
Background Motion remains a primary challenge for MR coronary angiography. In our previous protocol, we performed retrospective 3D motion correction based on a set of orthogonal 2D image-based navigators (iNAV) [1]. Recent work examined the use of anisotropic-resolution 3D Cartesian iNAVs every heartbeat [2]. Capitalizing on the efficiency of non-Cartesian imaging and iterative reconstruction, we sought an improved 3D iNAVs acquisition with isotropic resolution, to facilitate wholeheart motion correction with translational or more advanced models. In this work, we propose a method providing 3D motion correction on a per-heartbeat basis using a variable-density 3D cones iNAV acquisition [3].
Highlights
Motion remains a primary challenge for MR coronary angiography
The pulse sequence was modified by replacing the two 2D image-based navigators (iNAV) with a single 3D cones acquisition collected after the last cardiac phase within the ATR-SSFP train
Acquiring 3D iNAVs every heartbeat, 3D motion of the heart was measured during a free-breathing coronary MRA acquisition to provide 100% respiratory efficiency and retrospective motion correction
Summary
Motion remains a primary challenge for MR coronary angiography. We performed retrospective 3D motion correction based on a set of orthogonal 2D image-based navigators (iNAV) [1]. Recent work examined the use of anisotropic-resolution 3D Cartesian iNAVs every heartbeat [2]. Capitalizing on the efficiency of non-Cartesian imaging and iterative reconstruction, we sought an improved 3D iNAVs acquisition with isotropic resolution, to facilitate wholeheart motion correction with translational or more advanced models. We propose a method providing 3D motion correction on a per-heartbeat basis using a variable-density 3D cones iNAV acquisition [3]
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