Highly efficient 3D motion-compensated abdomen MRI from undersampled golden-RPE acquisitions.Revista : Magnetic Resonance Materials in Physics Biology and Medicine
Volumen : 26
Número : 5
Páginas : 419-429
Tipo de publicación : ISI Ir a publicación
A common approach to compensate for respiratory motion in free-breathing 3D magnetic resonance imaging (MRI) is navigator gating where MRI data is only acquired when the respiratory signal coincides within a small predefined acceptance window. However, this leads to poor scan efficiency and prolonged scan times. Here, we propose a method to reconstruct motion-compensated 3D MRI of the abdomen acquired during free-breathing with nearly 100 % scan efficiency without increasing scan time.The approach is based on a self-gated golden-radial phase encoding sampling scheme that allows for the reconstruction of multiple undersampled 3D images at different respiratory positions. Non-rigid image registrations and time-wise motion field interpolations are employed to form 3D motion models that combine all low-quality images into one high-quality motion-compensated image.Our highly efficient technique allows reconstruction of 3D liver MRI with a high isotropic resolution of 1.75 mm from a short acquisition of 1.1 min. The approach is validated in 10 healthy volunteers by comparing image quality to data sets acquired with a self-gating approach.Our method reduces scan time by 56 % compared to the gating technique while similar image quality is preserved.