Christian Buerger1, Claudia Prieto, Tobias Schaeffter. 1. 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.
Abstract
OBJECT: 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. MATERIALS AND 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. CONCLUSION: Our method reduces scan time by 56% compared to the gating technique while similar image quality is preserved.
OBJECT: 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. MATERIALS AND 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. CONCLUSION: Our method reduces scan time by 56% compared to the gating technique while similar image quality is preserved.
Authors: N Cem Balci; Alex S Befeler; Paula Leiva; Thomas K Pilgram; Necat Havlioglu Journal: J Gastroenterol Hepatol Date: 2008-08-17 Impact factor: 4.029
Authors: Wenwen Jiang; Frank Ong; Kevin M Johnson; Scott K Nagle; Thomas A Hope; Michael Lustig; Peder E Z Larson Journal: Magn Reson Med Date: 2017-10-11 Impact factor: 4.668