title: Highly efficient 3D motion-compensated abdomen MRI from undersampled golden-RPE acquisitions.
abstract: OBJECTIVE
  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.
  
  
  METHODS
  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.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  Our method reduces scan time by 56% compared to the gating technique while similar image quality is preserved.
authors: Division of Imaging Sciences and Biomedical Engineering, The Rayne Institute, King's College London, St Thomas' Hospital, 4th Floor, Lambeth Wing, London, SE1 7EH, UK, christian.buerger@philips.com.
authors: Christian
authors: C
authors: Buerger
authors: Claudia
authors: C
authors: Prieto
authors: Tobias
authors: T
authors: Schaeffter
mesh_terms: D016477:Artifacts; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008099:Liver / Q000473:pathology; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008962:Models, Theoretical; D009068:Movement; D016011:Normal Distribution; D015203:Reproducibility of Results; D012119:Respiration; D013997:Time Factors
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